Logcat BottomNavigationView 侦听器中的错误
Logcat error in BottomNavigationView Listener
虽然 运行 我的应用程序处于调试模式，但在使用 BottomNavigationListener 打开 Activity 时出现 logcat 错误。代码中似乎没有“错误”。会不会是使用了折旧的依赖或者API导致的？感谢您的帮助！
这是 logcat at com.example.chemicalequationbalancer.HelpGuide.onCreate(HelpGuide.java:37)
中突出显示的蓝色行
这是第 37 行 navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {，后面是下面添加的相同 activity 的代码：
HelpGuide.java class 导入：（我的大多数 classes 扩展了 AppCompatActivity）
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import mehdi.sakout.aboutpage.AboutPage;
import mehdi.sakout.aboutpage.BuildConfig;
import mehdi.sakout.aboutpage.Element;
BottomNavigationView代码在activity:
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(AboutUs.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
break;
case R.id.nav_help:
Intent b = new Intent(AboutUs.this, HelpGuide.class);
startActivity(b);
break;
}
return false;
}
});
ActivityMainfest.xml
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.ChemicalEquationBalancer">
<activity android:name="com.example.chemicalequationbalancer.AboutUs" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity android:name="com.example.chemicalequationbalancer.HelpGuide" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity android:name="com.example.chemicalequationbalancer.eleView" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity
android:name="com.example.chemicalequationbalancer.MainActivity"
android:label="@string/app_name"
android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Logcat:
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>> msg'1s executing time is too long
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Blocked msg = { when=-2s884ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc } , cost = 1542 ms
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>>Current msg List is:
2021-02-17 18:19:13.304 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <1> = { when=-2s883ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.304 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <2> = { when=-2s882ms what=0 target=android.app.ActivityThread$H callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
2021-02-17 18:19:13.305 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <3> = { when=-2s882ms what=149 target=android.app.ActivityThread$H obj=android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.306 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <4> = { when=-2s403ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.306 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <5> = { when=-2s403ms what=137 target=android.app.ActivityThread$H arg1=1 obj=android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.307 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <6> = { when=-1s126ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.307 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <7> = { when=-390ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.308 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <8> = { when=-382ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.308 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <9> = { when=-332ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.309 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <10> = { when=-325ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.309 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>>CURRENT MSG DUMP OVER<<<
2021-02-17 18:19:13.329 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.389 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.449 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.510 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.533 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:13.571 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.610 681-681/? E/Situation: processEvent, handle:26, flush_action:0
2021-02-17 18:19:13.611 681-681/? E/libc: Access denied finding property "ro.build.flavor"
2021-02-17 18:19:13.632 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.691 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.737 20042-20217/com.example.chemicalequationbalancer E/ion: ioctl c0044901 failed with code -1: Invalid argument
2021-02-17 18:19:13.738 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:13.739 1192-1503/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
2021-02-17 18:19:13.749 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.811 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.871 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.930 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.938 739-817/? E/facereg_hal: do_identify failed FACE_ERROR_CANCELLED
2021-02-17 18:19:13.989 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:14.030 1192-2967/? E/PowerHalWrapper: <amsBoostStop> duration: 6000ms
2021-02-17 18:19:14.077 681-1296/? E/SensorContext: activate, handle = 4, index = 3
2021-02-17 18:19:14.143 681-1296/? E/SensorContext: activate, handle = 3, index = 2
2021-02-17 18:19:14.178 681-681/? E/SensorContext: activate, handle = 3, index = 2
2021-02-17 18:19:14.179 681-681/? E/SensorContext: activate, handle = 1, index = 1
2021-02-17 18:19:14.184 681-681/? E/SensorContext: activate, handle = 0, index = 0
2021-02-17 18:19:14.189 681-681/? E/SensorContext: activate, handle = 0, index = 0
2021-02-17 18:19:14.360 1192-2967/? E/Process: get_ion_cache_memory: Unable to open /d/ion/heaps/system
2021-02-17 18:19:16.568 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.590 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.606 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.638 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.721 741-741/? E/CryptoEngInvokeCommand: crypto_eng_invoke_command set pms flag
2021-02-17 18:19:16.742 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.782 1192-1292/? E/DisplayEventDispatcher: dispatcher 0x7af60b7be0 ~ last event processed while scheduling was for 26200050
2021-02-17 18:19:16.799 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.801 2512-3009/? E/neodaemon: ERROR elsaNotifyAppSwitch is NULL
2021-02-17 18:19:16.804 741-741/? E/cryptoeng_hidl: commondcs service exist.
2021-02-17 18:19:16.843 1192-3201/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:16.846 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.854 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.858 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.860 1825-1825/? E/OppoTelephonyFunction: leon operatorNumic is not included in our romupdate xml file
2021-02-17 18:19:16.861 1825-1825/? E/m.android.phon: Invalid ID 0x00000000.
2021-02-17 18:19:16.865 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.881 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.892 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.900 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.912 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.950 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.001 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.016 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.039 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.045 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.078 19888-19970/? E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:17.087 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.110 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.123 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.155 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.173 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.177 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.216 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.248 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.252 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.252 4823-17448/? E/CheckPermission: _bluetooth code = 14
2021-02-17 18:19:17.263 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.270 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.333 1192-1338/? E/WifiScanRequestProxy: Scan failure received. reason: -1,description: not available
2021-02-17 18:19:17.342 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.350 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.452 19888-19888/? E/DisplayEventDispatcher: dispatcher 0x7b0181d280 ~ last event processed while scheduling was for 26201742
2021-02-17 18:19:18.472 19982-19985/? E/adbd: remote usb: read terminated (message): No such device
2021-02-17 18:19:18.568 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.617 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.622 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.636 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.643 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.645 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.647 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.924 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.933 1192-1215/? E/NotificationService: Suppressing notification from package by user request.
2021-02-17 18:19:18.965 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.969 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.972 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.976 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.980 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.071 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.074 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.076 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.080 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:20.163 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:19.098 1192-1215/? E/NotificationService: Suppressing notification from package by user request.
2021-02-17 18:19:22.995 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.051 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.054 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.068 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.121 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.304 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.307 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.317 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.326 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.329 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.450 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:24.339 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:24.343 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:26.124 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:26.179 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:27.598 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:27.864 681-1296/? E/Situation: processEvent, handle:26, flush_action:0
2021-02-17 18:19:27.864 681-1296/? E/libc: Access denied finding property "ro.build.flavor"
2021-02-17 18:19:30.293 9892-9904/? E/rutils: releaseProcess gCount = 1
2021-02-17 18:19:31.407 2512-3009/? E/neodaemon: ERROR elsaResume is NULL
2021-02-17 18:19:31.480 1192-3201/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:31.490 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:31.493 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:31.766 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.100 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.130 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.148 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.222 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.345 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.367 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.032 1192-3236/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:33.038 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.139 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.365 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.393 2512-3009/? E/neodaemon: ERROR elsaResume is NULL
2021-02-17 18:19:34.433 1192-3211/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:34.442 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.446 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.505 20042-20042/com.example.chemicalequationbalancer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.chemicalequationbalancer, PID: 20042
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.chemicalequationbalancer/com.example.chemicalequationbalancer.HelpGuide}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.bottomnavigation.BottomNavigationView.setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView$OnNavigationItemSelectedListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3197)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3334)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:113)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:71)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2025)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7191)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:499)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.bottomnavigation.BottomNavigationView.setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView$OnNavigationItemSelectedListener)' on a null object reference
at com.example.chemicalequationbalancer.HelpGuide.onCreate(HelpGuide.java:37)
at android.app.Activity.performCreate(Activity.java:7376)
at android.app.Activity.performCreate(Activity.java:7367)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3177)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3334)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:113)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:71)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2025)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7191)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:499)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
2021-02-17 18:19:34.591 1192-1321/? E/InputDispatcher: channel 'a589010 com.example.chemicalequationbalancer/com.example.chemicalequationbalancer.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
2021-02-17 18:19:34.630 2512-3009/? E/neodaemon: ERROR elsaNotifyAppSwitch is NULL
2021-02-17 18:19:34.645 1192-2916/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:34.651 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.662 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
请询问是否需要任何额外的文件或代码！
再次感谢！
编辑：Logcat 添加
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/nav_bottom"
android:layout_alignParentBottom="true"
app:itemTextColor="@android:color/black"
app:menu="@menu/drawer_view" />
菜单抽屉xml文件：
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="Home"
android:id="@+id/nav_home"
android:icon="@drawable/ic_baseline_home"/>
<item android:title="About Us"
android:id="@+id/nav_aboutus"
android:icon="@drawable/ic_baseline_abus"/>
<item android:title="Help"
android:id="@+id/nav_help"
android:icon="@drawable/ic_baseline_help"/>
这个菜单确实出现在主 activity 上。就在我单击 HelpGuide activity 或其他也使用此导航栏的 activity 时，应用程序崩溃了。
HelpGuide.java:
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import mehdi.sakout.aboutpage.AboutPage;
import mehdi.sakout.aboutpage.BuildConfig;
import mehdi.sakout.aboutpage.Element;
public class HelpGuide extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Element developersElement = new Element();
developersElement.setTitle("Help Guide");
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(HelpGuide.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
Intent b = new Intent(HelpGuide.this, AboutUs.class);
startActivity(b);
break;
case R.id.nav_help:
break;
}
return false;
}
});
AboutPage aboutPage = new AboutPage(this)
.isRTL(false)
.setImage(R.mipmap.ic_launcher)
.setDescription(getString(R.string.helpguide));
View aboutPageView = aboutPage.create();
}
}
实际上您的帮助指南 activity 没有 xml 文件的参考，您必须在 activity 中设置内容视图，如下所示。
public class HelpGuide extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourxmlhelpguide); <----- here is the solution
Element developersElement = new Element();
developersElement.setTitle("Help Guide");
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(HelpGuide.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
Intent b = new Intent(HelpGuide.this, AboutUs.class);
startActivity(b);
break;
case R.id.nav_help:
break;
}
return false;
}
});
AboutPage aboutPage = new AboutPage(this)
.isRTL(false)
.setImage(R.mipmap.ic_launcher)
.setDescription(getString(R.string.helpguide));
View aboutPageView = aboutPage.create();
}
}
并在帮助指南 xml 视图中添加底部导航视图。
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/nav_bottom"
android:layout_alignParentBottom="true"
app:itemTextColor="@android:color/black"
app:menu="@menu/drawer_view" />
虽然 运行 我的应用程序处于调试模式，但在使用 BottomNavigationListener 打开 Activity 时出现 logcat 错误。代码中似乎没有“错误”。会不会是使用了折旧的依赖或者API导致的？感谢您的帮助！
这是 logcat at com.example.chemicalequationbalancer.HelpGuide.onCreate(HelpGuide.java:37)
这是第 37 行 navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {，后面是下面添加的相同 activity 的代码：
HelpGuide.java class 导入：（我的大多数 classes 扩展了 AppCompatActivity）
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import mehdi.sakout.aboutpage.AboutPage;
import mehdi.sakout.aboutpage.BuildConfig;
import mehdi.sakout.aboutpage.Element;
BottomNavigationView代码在activity:
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(AboutUs.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
break;
case R.id.nav_help:
Intent b = new Intent(AboutUs.this, HelpGuide.class);
startActivity(b);
break;
}
return false;
}
});
ActivityMainfest.xml
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.ChemicalEquationBalancer">
<activity android:name="com.example.chemicalequationbalancer.AboutUs" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity android:name="com.example.chemicalequationbalancer.HelpGuide" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity android:name="com.example.chemicalequationbalancer.eleView" android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar"/>
<activity
android:name="com.example.chemicalequationbalancer.MainActivity"
android:label="@string/app_name"
android:theme="@style/Theme.ChemicalEquationBalancer.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Logcat:
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>> msg'1s executing time is too long
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Blocked msg = { when=-2s884ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc } , cost = 1542 ms
2021-02-17 18:19:13.303 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>>Current msg List is:
2021-02-17 18:19:13.304 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <1> = { when=-2s883ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.304 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <2> = { when=-2s882ms what=0 target=android.app.ActivityThread$H callback=com.android.internal.util.function.pooled.PooledLambdaImpl }
2021-02-17 18:19:13.305 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <3> = { when=-2s882ms what=149 target=android.app.ActivityThread$H obj=android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.306 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <4> = { when=-2s403ms what=159 target=android.app.ActivityThread$H obj=ClientTransaction hashCode, mActivityToken = android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.306 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <5> = { when=-2s403ms what=137 target=android.app.ActivityThread$H arg1=1 obj=android.os.BinderProxy@ec0d4dc }
2021-02-17 18:19:13.307 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <6> = { when=-1s126ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.307 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <7> = { when=-390ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.308 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <8> = { when=-382ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.308 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <9> = { when=-332ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.309 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: Current msg <10> = { when=-325ms what=0 target=android.os.Handler callback=androidx.core.content.res.ResourcesCompat$FontCallback }
2021-02-17 18:19:13.309 20042-20042/com.example.chemicalequationbalancer E/ANR_LOG: >>>CURRENT MSG DUMP OVER<<<
2021-02-17 18:19:13.329 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.389 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.449 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.510 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.533 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:13.571 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.610 681-681/? E/Situation: processEvent, handle:26, flush_action:0
2021-02-17 18:19:13.611 681-681/? E/libc: Access denied finding property "ro.build.flavor"
2021-02-17 18:19:13.632 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.691 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.737 20042-20217/com.example.chemicalequationbalancer E/ion: ioctl c0044901 failed with code -1: Invalid argument
2021-02-17 18:19:13.738 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:13.739 1192-1503/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
2021-02-17 18:19:13.749 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.811 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.871 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.930 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:13.938 739-817/? E/facereg_hal: do_identify failed FACE_ERROR_CANCELLED
2021-02-17 18:19:13.989 686-20185/? E/MDP: DpIspStream::waitComplete m_DREPABufferStartIndexList empty
2021-02-17 18:19:14.030 1192-2967/? E/PowerHalWrapper: <amsBoostStop> duration: 6000ms
2021-02-17 18:19:14.077 681-1296/? E/SensorContext: activate, handle = 4, index = 3
2021-02-17 18:19:14.143 681-1296/? E/SensorContext: activate, handle = 3, index = 2
2021-02-17 18:19:14.178 681-681/? E/SensorContext: activate, handle = 3, index = 2
2021-02-17 18:19:14.179 681-681/? E/SensorContext: activate, handle = 1, index = 1
2021-02-17 18:19:14.184 681-681/? E/SensorContext: activate, handle = 0, index = 0
2021-02-17 18:19:14.189 681-681/? E/SensorContext: activate, handle = 0, index = 0
2021-02-17 18:19:14.360 1192-2967/? E/Process: get_ion_cache_memory: Unable to open /d/ion/heaps/system
2021-02-17 18:19:16.568 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.590 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.606 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.638 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.721 741-741/? E/CryptoEngInvokeCommand: crypto_eng_invoke_command set pms flag
2021-02-17 18:19:16.742 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.782 1192-1292/? E/DisplayEventDispatcher: dispatcher 0x7af60b7be0 ~ last event processed while scheduling was for 26200050
2021-02-17 18:19:16.799 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.801 2512-3009/? E/neodaemon: ERROR elsaNotifyAppSwitch is NULL
2021-02-17 18:19:16.804 741-741/? E/cryptoeng_hidl: commondcs service exist.
2021-02-17 18:19:16.843 1192-3201/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:16.846 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.854 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.858 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.860 1825-1825/? E/OppoTelephonyFunction: leon operatorNumic is not included in our romupdate xml file
2021-02-17 18:19:16.861 1825-1825/? E/m.android.phon: Invalid ID 0x00000000.
2021-02-17 18:19:16.865 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.881 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.892 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.900 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.912 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:16.950 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.001 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.016 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.039 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.045 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.078 19888-19970/? E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:17.087 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.110 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.123 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.155 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.173 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.177 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.216 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.248 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.252 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.252 4823-17448/? E/CheckPermission: _bluetooth code = 14
2021-02-17 18:19:17.263 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.270 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.333 1192-1338/? E/WifiScanRequestProxy: Scan failure received. reason: -1,description: not available
2021-02-17 18:19:17.342 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:17.350 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.452 19888-19888/? E/DisplayEventDispatcher: dispatcher 0x7b0181d280 ~ last event processed while scheduling was for 26201742
2021-02-17 18:19:18.472 19982-19985/? E/adbd: remote usb: read terminated (message): No such device
2021-02-17 18:19:18.568 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.617 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.622 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.636 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.643 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.645 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.647 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.924 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.933 1192-1215/? E/NotificationService: Suppressing notification from package by user request.
2021-02-17 18:19:18.965 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.969 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.972 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.976 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:18.980 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.071 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.074 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.076 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:19.080 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:20.163 20042-20217/com.example.chemicalequationbalancer E/GED: Failed to get GED Log Buf, err(0)
2021-02-17 18:19:19.098 1192-1215/? E/NotificationService: Suppressing notification from package by user request.
2021-02-17 18:19:22.995 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.051 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.054 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.068 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.121 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.304 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.307 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.317 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.326 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.329 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:23.450 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:24.339 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:24.343 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:26.124 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:26.179 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:27.598 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:27.864 681-1296/? E/Situation: processEvent, handle:26, flush_action:0
2021-02-17 18:19:27.864 681-1296/? E/libc: Access denied finding property "ro.build.flavor"
2021-02-17 18:19:30.293 9892-9904/? E/rutils: releaseProcess gCount = 1
2021-02-17 18:19:31.407 2512-3009/? E/neodaemon: ERROR elsaResume is NULL
2021-02-17 18:19:31.480 1192-3201/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:31.490 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:31.493 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:31.766 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.100 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.130 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.148 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.222 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.345 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:32.367 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.032 1192-3236/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:33.038 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.139 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:33.365 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.393 2512-3009/? E/neodaemon: ERROR elsaResume is NULL
2021-02-17 18:19:34.433 1192-3211/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:34.442 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.446 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.505 20042-20042/com.example.chemicalequationbalancer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.chemicalequationbalancer, PID: 20042
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.chemicalequationbalancer/com.example.chemicalequationbalancer.HelpGuide}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.bottomnavigation.BottomNavigationView.setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView$OnNavigationItemSelectedListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3197)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3334)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:113)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:71)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2025)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7191)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:499)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.bottomnavigation.BottomNavigationView.setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView$OnNavigationItemSelectedListener)' on a null object reference
at com.example.chemicalequationbalancer.HelpGuide.onCreate(HelpGuide.java:37)
at android.app.Activity.performCreate(Activity.java:7376)
at android.app.Activity.performCreate(Activity.java:7367)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3177)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3334)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:113)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:71)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2025)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:226)
at android.app.ActivityThread.main(ActivityThread.java:7191)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:499)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)
2021-02-17 18:19:34.591 1192-1321/? E/InputDispatcher: channel 'a589010 com.example.chemicalequationbalancer/com.example.chemicalequationbalancer.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
2021-02-17 18:19:34.630 2512-3009/? E/neodaemon: ERROR elsaNotifyAppSwitch is NULL
2021-02-17 18:19:34.645 1192-2916/? E/OifaceUtil: Cannot connect to OifaceService
2021-02-17 18:19:34.651 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
2021-02-17 18:19:34.662 2512-3009/? E/neodaemon: ERROR elsaGetPackageFreezing is NULL
请询问是否需要任何额外的文件或代码！ 再次感谢！
编辑：Logcat 添加
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/nav_bottom"
android:layout_alignParentBottom="true"
app:itemTextColor="@android:color/black"
app:menu="@menu/drawer_view" />
菜单抽屉xml文件：
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="Home"
android:id="@+id/nav_home"
android:icon="@drawable/ic_baseline_home"/>
<item android:title="About Us"
android:id="@+id/nav_aboutus"
android:icon="@drawable/ic_baseline_abus"/>
<item android:title="Help"
android:id="@+id/nav_help"
android:icon="@drawable/ic_baseline_help"/>
这个菜单确实出现在主 activity 上。就在我单击 HelpGuide activity 或其他也使用此导航栏的 activity 时，应用程序崩溃了。 HelpGuide.java:
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import mehdi.sakout.aboutpage.AboutPage;
import mehdi.sakout.aboutpage.BuildConfig;
import mehdi.sakout.aboutpage.Element;
public class HelpGuide extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Element developersElement = new Element();
developersElement.setTitle("Help Guide");
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(HelpGuide.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
Intent b = new Intent(HelpGuide.this, AboutUs.class);
startActivity(b);
break;
case R.id.nav_help:
break;
}
return false;
}
});
AboutPage aboutPage = new AboutPage(this)
.isRTL(false)
.setImage(R.mipmap.ic_launcher)
.setDescription(getString(R.string.helpguide));
View aboutPageView = aboutPage.create();
}
}
实际上您的帮助指南 activity 没有 xml 文件的参考，您必须在 activity 中设置内容视图，如下所示。
public class HelpGuide extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourxmlhelpguide); <----- here is the solution
Element developersElement = new Element();
developersElement.setTitle("Help Guide");
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.nav_bottom);
navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
Intent a = new Intent(HelpGuide.this, MainActivity.class);
startActivity(a);
break;
case R.id.nav_aboutus:
Intent b = new Intent(HelpGuide.this, AboutUs.class);
startActivity(b);
break;
case R.id.nav_help:
break;
}
return false;
}
});
AboutPage aboutPage = new AboutPage(this)
.isRTL(false)
.setImage(R.mipmap.ic_launcher)
.setDescription(getString(R.string.helpguide));
View aboutPageView = aboutPage.create();
}
}
并在帮助指南 xml 视图中添加底部导航视图。
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/nav_bottom"
android:layout_alignParentBottom="true"
app:itemTextColor="@android:color/black"
app:menu="@menu/drawer_view" />