BroadcastReceiver总结

一、工程整体图

二、activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_register"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="registerReceiver"
 	/>

   <Button
        android:id="@+id/btn_unregister"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="unregisterReceiver"
 	/>

   <Button
        android:id="@+id/btn_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="send"
 	/>

</LinearLayout>

三、AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jltxgcy.broadcastreceiverdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".MyReceiver">
			<intent-filter>
				<action android:name="com.jltxgcy.receiver" />
			</intent-filter>
		</receiver>
		       <service
            android:name=".HelloIntentService">
        </service>
    </application>

</manifest>

四、MainActivity.java

package com.jltxgcy.broadcastreceiverdemo;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {
	public static final String ACTION="com.jltxgcy.receiver";
	public BroadcastReceiver mBroadcastReceiver= new MyReceiver();

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

        findViewById(R.id.btn_register).setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				/*IntentFilter filter = new IntentFilter();
				filter.addAction(ACTION);
				filter.setPriority(Integer.MAX_VALUE);
				registerReceiver(mBroadcastReceiver, filter);	*/
			}
		});

        findViewById(R.id.btn_unregister).setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
//				unregisterReceiver(mBroadcastReceiver);

			}
		});

        findViewById(R.id.btn_send).setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				sendBroadcast(new Intent(ACTION));
			}
		});
    }

	@Override
	protected void onStop() {
//		unregisterReceiver(mBroadcastReceiver);
		super.onStop();
	}

}

五、MyReceiver.java

package com.jltxgcy.broadcastreceiverdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyReceiver extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent arg1) {
		Log.d("jltxgcy", "onReceiver");
		Intent intent = new Intent(context, HelloIntentService.class);
		context.startService(intent);
	}

}

六、HelloIntentService.java

package com.jltxgcy.broadcastreceiverdemo;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

public class HelloIntentService extends IntentService {
	public static final String TAG="jltxgcy";

	public HelloIntentService() {
		super("HelloIntentService");
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void onHandleIntent(Intent intent) {
		long endTime = System.currentTimeMillis() + 5*1000;
	      while (System.currentTimeMillis() < endTime) {
	          synchronized (this) {
	              try {
	                  wait(endTime - System.currentTimeMillis());
	              } catch (Exception e) {
	              }
	          }
	      }
	      Log.d(TAG, "onHandleIntent"+Thread.currentThread().getId());
	}

	@Override
	public void onDestroy() {
		super.onDestroy();
		Log.d(TAG, "onDestroy");
	}

}

七、详解

动态注册，不需要在AndroidManifest.xml中写上receiver。Activity退出后一定要关闭掉动态注册的receiver，否则会报告异常。

静态注册，需要在AndroidManifest.xml中写上receiver。即使Activity退出后，也在接受消息。

发送广播有两类，一个是系统发送的广播，一个是自己定义发送的广播。

在onReceiver，如果超过10s，那么就会产生ANR，最好的方法是开启一个IntentService，完成任务后自动关闭IntentService。

如果直接启动一个新的线程，那么无法控制线程的关闭。