Intent Service 和 Class 之间未传递的值

Question

解释： 我在一个新的 class (connectionchecker.java) 中创建了这个意图服务，用于检查互联网连接。现在在我的主 class (First.java) 中，没有收到值，因为 if() 从未执行过。我的应用 没有崩溃 ，问题是 TextView 卡在 "CONNECTION:" 而不是说 "CONNECTION:You are not connected to the internet." 或“"CONNECTION:You are not connected to the internet.".

代码： First.java

package com.lofty.lofti;

import com.lofty.lofti.util.SystemUiHider;

import android.annotation.TargetApi;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView.OnKeyboardActionListener;
import android.view.KeyEvent;
import android.view.View.OnKeyListener;
import android.inputmethodservice.KeyboardView;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.content.BroadcastReceiver;

/**
 * An example full-screen activity that shows and hides the system UI (i.e.
 * status bar and navigation/system bar) with user interaction.
 *
 * @see SystemUiHider
 */
public class First extends Activity {
    /**
     * Whether or not the system UI should be auto-hidden after
     * {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
     */
    private static final boolean AUTO_HIDE = true;

    /**
     * If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
     * user interaction before hiding the system UI.
     */
    private static final int AUTO_HIDE_DELAY_MILLIS = 3000;

    /**
     * If set, will toggle the system UI visibility upon interaction. Otherwise,
     * will show the system UI visibility upon interaction.
     */
    private static final boolean TOGGLE_ON_CLICK = true;

    /**
     * The flags to pass to {@link SystemUiHider#getInstance}.
     */
    private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;

    /**
     * The instance of the {@link SystemUiHider} for this activity.
     */
    private SystemUiHider mSystemUiHider;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getActionBar().hide(); // HIDE ACTION BAR.
        setContentView(R.layout.activity_first);




        EditText enter = (EditText) findViewById(R.id.searchbox);
        enter.setOnKeyListener(new OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_ENTER) {
                    EditText searchbox = (EditText) findViewById(R.id.searchbox);
                    String search = searchbox.getText().toString();
                    Intent open = new Intent(Intent.ACTION_WEB_SEARCH);
                    open.putExtra(SearchManager.QUERY, search);
                    startActivity(open);
                    return true;
                }
                else
                {
                    return false;
                }
            }
        });
    }

    public class Connection extends BroadcastReceiver
    {
        @Override
        public void onReceive(Context context, Intent intent) {
            Integer connectionn = intent.getIntExtra("connection",0);
            TextView connectiontext = (TextView) findViewById(R.id.connectiontext);

            if(connectionn==1)
            {
                    connectiontext.setText("CONNECTION:You are not connected to the internet.");
            }
            if(connectionn==0)
            {
                    connectiontext.setText("CONNECTION:You are not connected to the internet.");

            }
        }
    }

    public void exit(View view)
     {
         finish();
         System.exit(0);
     }

    public void usernameclick (View view)
    {
        EditText searchbox = (EditText) findViewById(R.id.searchbox);
        String search = searchbox.getText().toString();
        Intent open = new Intent(Intent.ACTION_WEB_SEARCH);
        open.putExtra(SearchManager.QUERY, search);
        startActivity(open);

    }


}

connectionchecker.java

package com.lofty.lofti;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.EditText;

public class connectionchecker extends IntentService
{
    public static final int connection =0;

    public connectionchecker() {
        super("connectionchecker");

    }

    @Override
    protected void onHandleIntent(Intent intent) {
        ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED || connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED|| connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_ETHERNET).getState()== NetworkInfo.State.CONNECTED)

        {

            Intent data = new Intent(this, First.class);
            data.putExtra("connection",1);
            sendBroadcast(data);
        }
        else
        {
            Intent data = new Intent(this, First.class);
            data.putExtra("connection", 0 );
            sendBroadcast(data);
        }
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lofty.lofti" >
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".First"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name"
            android:theme="@style/FullscreenTheme" >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".connectionchecker"/>
        <receiver android:name=".First$Connection"/>
    </application>


</manifest>

谢谢你，祝你有美好的一天。

Logcat:

10-23 16:01:25.765    2175-2175/com.lofty.lofti E/Zygote﹕ MountEmulatedStorage()
10-23 16:01:25.765    2175-2175/com.lofty.lofti E/Zygote﹕ v2
10-23 16:01:25.775    2175-2175/com.lofty.lofti I/SELinux﹕ Function: selinux_compare_spd_ram, SPD-policy is existed. and_ver=SEPF_GT-I9505_5.0.1 ver=27
10-23 16:01:25.775    2175-2175/com.lofty.lofti I/SELinux﹕ Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_GT-I9505_5.0.1-1_0032
10-23 16:01:25.775    2175-2175/com.lofty.lofti E/SELinux﹕ [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
10-23 16:01:25.775    2175-2175/com.lofty.lofti I/art﹕ Late-enabling -Xcheck:jni
10-23 16:01:25.955    2175-2175/com.lofty.lofti D/ResourcesManager﹕ creating new AssetManager and set to /data/app/com.lofty.lofti-2/base.apk
10-23 16:01:26.185    2175-2175/com.lofty.lofti D/AndroidRuntime﹕ Shutting down VM
10-23 16:01:26.195    2175-2175/com.lofty.lofti E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.lofty.lofti, PID: 2175
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lofty.lofti/com.lofty.lofti.First}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
            at android.app.ActivityThread.access0(ActivityThread.java:177)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:5942)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
     Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
            at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:309)
            at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:278)
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:252)
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
            at com.lofty.lofti.First.onCreate(First.java:68)
            at android.app.Activity.performCreate(Activity.java:6289)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
            at android.app.ActivityThread.access0(ActivityThread.java:177)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:5942)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
10-23 16:06:26.538    2175-2175/? I/Process﹕ Sending signal. PID: 2175 SIG: 9

Answer 1

我只是按照 Lars http://www.vogella.com/tutorials/AndroidBroadcastReceiver/article.html

的教程更新了你的代码

您必须注册广播接收器才能接收任何内容。看看这个问题。

IntentFilter filter = new IntentFilter(Connection.ACTION_RESP);
registerReceiver(mConnection, filter);

您的服务没有启动（至少在您提供的代码中）

在你的 Activity 'onCreate'

// Start your Service
Intent msgIntent = new Intent(this, ConnectionChecker.class);
startService(msgIntent);

您没有实例化 BroadCastReceiver

// Instanciate your BCR
mConnection = new Connection();

定义消息：

public static final String ACTION_RESP = "intent.action.MESSAGE_PROCESSED";

将消息定义为 Intent

data.setAction(MainActivity.Connection.ACTION_RESP);

对服务发送的使用默认 Intent 构造函数
```
Intent data = new Intent();
```

最后，整个代码：

Activity

public class MainActivity extends AppCompatActivity {

private Connection mConnection;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    EditText enter = (EditText) findViewById(R.id.searchbox);
    enter.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_ENTER) {
                EditText searchbox = (EditText) findViewById(R.id.searchbox);
                String search = searchbox.getText().toString();
                Intent open = new Intent(Intent.ACTION_WEB_SEARCH);
                open.putExtra(SearchManager.QUERY, search);
                startActivity(open);
                return true;
            } else {
                return false;
            }
        }
    });

    // Start your Service
    Intent msgIntent = new Intent(this, ConnectionChecker.class);
    startService(msgIntent);

    // Instanciate BCR
    mConnection = new Connection();
    // Register BCR
    IntentFilter filter = new IntentFilter(Connection.ACTION_RESP);
    registerReceiver(mConnection, filter);

}

public class Connection extends BroadcastReceiver {
    public static final String ACTION_RESP = "intent.action.MESSAGE_PROCESSED";

    @Override
    public void onReceive(Context context, Intent intent) {
        Integer connectionn = intent.getIntExtra("connection", 0);
        TextView connectiontext = (TextView) findViewById(R.id.connectiontext);

        if (connectionn == 1)
            connectiontext.setText("CONNECTION:You are not connected to the internet.");
        else
            connectiontext.setText("CONNECTION:You are not connected to the internet.");

    }
}

public void exit(View view) {
    finish();
    System.exit(0);
}

public void usernameclick(View view) {
    EditText searchbox = (EditText) findViewById(R.id.searchbox);
    String search = searchbox.getText().toString();
    Intent open = new Intent(Intent.ACTION_WEB_SEARCH);
    open.putExtra(SearchManager.QUERY, search);
    startActivity(open);

}

}

服务

public class ConnectionChecker 扩展了 IntentService { public 静态最终 int 连接 =0;

public ConnectionChecker() {
    super("connectionchecker");

}

@Override
protected void onHandleIntent(Intent intent) {
    ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED || connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED|| connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_ETHERNET).getState()== NetworkInfo.State.CONNECTED)

    {

        Intent data = new Intent();
        data.setAction(MainActivity.Connection.ACTION_RESP);
        data.putExtra("connection", 1);
        sendBroadcast(data);


    }
    else
    {
        Intent data = new Intent();
        data.setAction(MainActivity.Connection.ACTION_RESP);
        data.putExtra("connection", 0 );
        sendBroadcast(data);
    }
}

}

Answer 2

the values are not received because the if() is never executed

为 Intent 传递一个操作，而不是像这样使用：

Intent data = new Intent(this, First.class);

但是，你应该：

Intent data = new Intent("ACTION_NAME");

并确保您注册了要显示的操作：

<receiver android:name=".First$Connection">
    <intent-filter>
        <action android:name="ACTION_NAME" />
    </intent-filter>
</receiver>

the problem is the TextView is stuck

为connectiontext创建一个实例变量：

public class First extends Activity {

    ...
    private TextView connectiontext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        getActionBar().hide(); // HIDE ACTION BAR.
        connectiontext = (TextView) findViewById(R.id.connectiontext);
        ...
    }
...
}

Intent Service 和 Class 之间未传递的值

Values not passed between Intent Service and Class

java

service

android

handler

android-intent