Android 生命周期 - BroadcastReceiver

AndroidRefine 2016-11

系列博文：

Android 生命周期 - Activity
Android 生命周期 - Service
Android 生命周期 - BroadcastReceiver
Android 生命周期 - Fragment
Android 生命周期 - View

BroadcastReceiver的生命周期回调方法只有onReceive(Context context, Intent intent)方法，该方法运行在UI线程中，所以不可以做耗时操作，推荐使用IntentServer或者自定义带有子线程的Server，当然如果功能简单，可以直接启用子线程去完成耗时操作（前提是该app具有至少一个Activity，以防止该进程被Android系统直接回收），实例Demo如下：

测试Code

BCIntentServer.java

public class BCIntentServer extends IntentService {
    /**
     * Creates an IntentService.  Invoked by your subclass's constructor.
     */
    public BCIntentServer() {
        super("BCIntentServer");
    }
    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
        Log.i(MainActivity.TAG, "BCIntentServer onStart()");
    }
    @Override
    protected void onHandleIntent(Intent intent) {
        toWork();
    }
    public static void toWork() {
        Log.i(MainActivity.TAG, "Current Thread is: " + Thread.currentThread().getName());
        try {
            Thread.sleep(11000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

BCBroadcastReceiver.java

public class BCBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
//方式一，直接在主线程中做耗时操作
//        toWorkWithUIThread();
//方式二，直接开启子线程做耗时操作
//        toWordWithSubThread();
//方式三，使用IntentServer做耗时操作
        toWorkWithServerThread(context);
    }
    private void toWorkWithUIThread() {
        toWork();
    }
    private void toWordWithSubThread() {
        new Thread() {
            @Override
            public void run() {
                toWork();
            }
        }.start();
    }
    private void toWorkWithServerThread(Context context) {
        context.startService(new Intent(context, BCIntentServer.class));
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {
    public static final String TAG = "mutex";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, "MainActivity onCreate()");
    }
    public void sendNow(View view) {
        Intent intent = new Intent("fresco.mutex.com.lifecycle.RECEIVER_FOR_TEST");
        sendBroadcast(intent);
    }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="fresco.mutex.com.lifecycle.MainActivity">
    <Button
        android:id="@+id/activity_main_jump"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="jumpNow"
        android:text="Jump SecondActivity Now!"
        android:textSize="20dp" />
    <Button
        android:id="@+id/activity_main_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/activity_main_jump"
        android:layout_centerInParent="true"
        android:layout_marginTop="20dp"
        android:onClick="sendNow"
        android:text="Send BroadCasatReceiver Now!"
        android:textSize="20dp" />
</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="fresco.mutex.com.lifecycle">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity">
            <intent-filter>
                <action android:name="android.intent.action.DELETE" />
            </intent-filter>
        </activity>
        <service android:name=".BCService" />
        <service android:name=".BCIntentServer" />
        <receiver android:name=".BCBroadcastReceiver">
            <intent-filter>
                <action android:name="fresco.mutex.com.lifecycle.RECEIVER_FOR_TEST" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

测试结果

方式一

方式二

生命周期正常

方式三

生命周期正常