我的自定义抽屉导航工具栏有什么错误？
What is the error in my custom drawer navigation toolbar?
当我尝试 link 使用 ActionBarDrawerToggle 自定义工具栏时，我的应用程序崩溃了。以下是我的代码：
package com.example.customnavdrawerapp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import android.app.TaskStackBuilder;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MenuItem;
import android.widget.Toast;
import android.widget.Toolbar;
import com.google.android.material.navigation.NavigationView;
public class MainActivity extends AppCompatActivity {
NavigationView navView;
ActionBarDrawerToggle toggle;
DrawerLayout drawerLayout;
androidx.appcompat.widget.Toolbar toolbarr; //THIS AS SOON AS DEFINED WITH ID SHOWS ERROR
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbarr = findViewById(R.id.toolbar); //REMOVE THIS LINE AND THE APP WORKS PERFECT, BUT DOESN'T OPEN THE NAVIGATION VIEW ON CLICKING THE TOOLBAR
navView = findViewById(R.id.navMenu);
drawerLayout = findViewById(R.id.drawer);
toggle= new ActionBarDrawerToggle(this,drawerLayout,toolbarr,R.string.open,R.string.close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_home:
Toast.makeText(getApplicationContext(),"Home panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.menu_call:
Toast.makeText(getApplicationContext(),"Call panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.menu_setting:
Toast.makeText(getApplicationContext(),"Setting panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
}
return true;
}
});
}
}
我在代码中添加了注释以说明导致错误的原因。
如果我定义工具栏，应用程序会一直停止。
堆栈跟踪：
2021-05-26 06:33:55.811 24315-24315/? I/tomnavdrawerap: Late-enabling -Xcheck:jni
2021-05-26 06:33:55.862 24315-24315/? E/tomnavdrawerap: Unknown bits set in runtime_flags: 0x8000
2021-05-26 06:33:55.907 24315-24315/? D/ActivityThread: setConscryptValidator
2021-05-26 06:33:55.908 24315-24315/? D/ActivityThread: setConscryptValidator - put
2021-05-26 06:33:56.334 24315-24315/com.example.customnavdrawerapp I/Perf: Connecting to perf service.
2021-05-26 06:33:56.573 24315-24315/com.example.customnavdrawerapp D/PhoneWindow: forceLight changed to true [] from com.android.internal.policy.PhoneWindow.updateForceLightNavigationBar:4238 com.android.internal.policy.DecorView.updateColorViews:1510 com.android.internal.policy.PhoneWindow.dispatchWindowAttributesChanged:3216 android.view.Window.setFlags:1148 com.android.internal.policy.PhoneWindow.generateLayout:2444
2021-05-26 06:33:56.576 24315-24315/com.example.customnavdrawerapp I/MultiWindowDecorSupport: updateCaptionType >> DecorView@3f6abf6[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2021-05-26 06:33:56.576 24315-24315/com.example.customnavdrawerapp D/MultiWindowDecorSupport: setCaptionType = 0, DecorView = DecorView@3f6abf6[]
2021-05-26 06:33:56.656 24315-24315/com.example.customnavdrawerapp W/tomnavdrawerap: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2021-05-26 06:33:56.659 24315-24315/com.example.customnavdrawerapp W/tomnavdrawerap: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
2021-05-26 06:33:56.938 24315-24315/com.example.customnavdrawerapp D/AndroidRuntime: Shutting down VM
2021-05-26 06:33:56.943 24315-24315/com.example.customnavdrawerapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.customnavdrawerapp, PID: 24315
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.customnavdrawerapp/com.example.customnavdrawerapp.MainActivity}: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3556)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
Caused by: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
at com.example.customnavdrawerapp.MainActivity.onCreate(MainActivity.java:30)
at android.app.Activity.performCreate(Activity.java:7955)
at android.app.Activity.performCreate(Activity.java:7944)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3531)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
2021-05-26 06:33:56.972 24315-24315/com.example.customnavdrawerapp I/Process: Sending signal. PID: 24315 SIG: 9
请帮我解决问题。我最近开始 android 开发，如果这个问题没有通过网站的标准，我很抱歉。
没有看到 XML 你似乎在使用两个不同的库。
import android.widget.Toolbar; //you are using this in you code but using this androidx.appcompat.widget.Toolbar in your XML
它们不一样，所以当你这样做的时候
toolbarr = findViewById(R.id.toolbar);
toolbarr = android.widget.Toolbar
findViewById(R.id.toolbar); = androidx.appcompat.widget.Toolbar
简单修复删除 import android.widget.Toolbar;
并添加
import androidx.appcompat.widget.Toolbar
当我尝试 link 使用 ActionBarDrawerToggle 自定义工具栏时，我的应用程序崩溃了。以下是我的代码：
package com.example.customnavdrawerapp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import android.app.TaskStackBuilder;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MenuItem;
import android.widget.Toast;
import android.widget.Toolbar;
import com.google.android.material.navigation.NavigationView;
public class MainActivity extends AppCompatActivity {
NavigationView navView;
ActionBarDrawerToggle toggle;
DrawerLayout drawerLayout;
androidx.appcompat.widget.Toolbar toolbarr; //THIS AS SOON AS DEFINED WITH ID SHOWS ERROR
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbarr = findViewById(R.id.toolbar); //REMOVE THIS LINE AND THE APP WORKS PERFECT, BUT DOESN'T OPEN THE NAVIGATION VIEW ON CLICKING THE TOOLBAR
navView = findViewById(R.id.navMenu);
drawerLayout = findViewById(R.id.drawer);
toggle= new ActionBarDrawerToggle(this,drawerLayout,toolbarr,R.string.open,R.string.close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_home:
Toast.makeText(getApplicationContext(),"Home panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.menu_call:
Toast.makeText(getApplicationContext(),"Call panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.menu_setting:
Toast.makeText(getApplicationContext(),"Setting panel is open",Toast.LENGTH_LONG).show();
drawerLayout.closeDrawer(GravityCompat.START);
break;
}
return true;
}
});
}
}
我在代码中添加了注释以说明导致错误的原因。
如果我定义工具栏，应用程序会一直停止。
堆栈跟踪：
2021-05-26 06:33:55.811 24315-24315/? I/tomnavdrawerap: Late-enabling -Xcheck:jni
2021-05-26 06:33:55.862 24315-24315/? E/tomnavdrawerap: Unknown bits set in runtime_flags: 0x8000
2021-05-26 06:33:55.907 24315-24315/? D/ActivityThread: setConscryptValidator
2021-05-26 06:33:55.908 24315-24315/? D/ActivityThread: setConscryptValidator - put
2021-05-26 06:33:56.334 24315-24315/com.example.customnavdrawerapp I/Perf: Connecting to perf service.
2021-05-26 06:33:56.573 24315-24315/com.example.customnavdrawerapp D/PhoneWindow: forceLight changed to true [] from com.android.internal.policy.PhoneWindow.updateForceLightNavigationBar:4238 com.android.internal.policy.DecorView.updateColorViews:1510 com.android.internal.policy.PhoneWindow.dispatchWindowAttributesChanged:3216 android.view.Window.setFlags:1148 com.android.internal.policy.PhoneWindow.generateLayout:2444
2021-05-26 06:33:56.576 24315-24315/com.example.customnavdrawerapp I/MultiWindowDecorSupport: updateCaptionType >> DecorView@3f6abf6[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2021-05-26 06:33:56.576 24315-24315/com.example.customnavdrawerapp D/MultiWindowDecorSupport: setCaptionType = 0, DecorView = DecorView@3f6abf6[]
2021-05-26 06:33:56.656 24315-24315/com.example.customnavdrawerapp W/tomnavdrawerap: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2021-05-26 06:33:56.659 24315-24315/com.example.customnavdrawerapp W/tomnavdrawerap: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
2021-05-26 06:33:56.938 24315-24315/com.example.customnavdrawerapp D/AndroidRuntime: Shutting down VM
2021-05-26 06:33:56.943 24315-24315/com.example.customnavdrawerapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.customnavdrawerapp, PID: 24315
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.customnavdrawerapp/com.example.customnavdrawerapp.MainActivity}: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3556)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
Caused by: java.lang.ClassCastException: android.widget.Toolbar cannot be cast to androidx.appcompat.widget.Toolbar
at com.example.customnavdrawerapp.MainActivity.onCreate(MainActivity.java:30)
at android.app.Activity.performCreate(Activity.java:7955)
at android.app.Activity.performCreate(Activity.java:7944)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3531)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3703)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2216)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7948)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
2021-05-26 06:33:56.972 24315-24315/com.example.customnavdrawerapp I/Process: Sending signal. PID: 24315 SIG: 9
请帮我解决问题。我最近开始 android 开发，如果这个问题没有通过网站的标准，我很抱歉。
没有看到 XML 你似乎在使用两个不同的库。
import android.widget.Toolbar; //you are using this in you code but using this androidx.appcompat.widget.Toolbar in your XML
它们不一样，所以当你这样做的时候
toolbarr = findViewById(R.id.toolbar);
toolbarr = android.widget.Toolbar
findViewById(R.id.toolbar); = androidx.appcompat.widget.Toolbar
简单修复删除 import android.widget.Toolbar;
并添加
import androidx.appcompat.widget.Toolbar