有序广播 75

最新推荐文章于 2022-07-04 06:00:00 发布

原创最新推荐文章于 2022-07-04 06:00:00 发布 · 463 阅读

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priority的值越大，优先级越高。

程序：打开activity就发送一个有序广播，一共有三个广播接受者，FirstReceive，SecondReceive和ThirdReceive，优先级别分别为800,700,600，FirstReceive得到广播中的字符串后打印出来：hello java，自己再发送一个字符串A给优先级别低的SecondReceive，SecondReceive接收到 hello java和 A后打印出来，并终止广播，ThirdReceive就接收不到广播。

A字符串即"来源于FirstReceiver的文本"。

public class MainActivity extends Activity {
	ThirdReceiver mReceiver;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		registgerReceiver();
		Intent intent=new Intent("com.sxt.day07_06.order_broadcast");
		intent.putExtra("key", "hello java");
		sendOrderedBroadcast(intent, null);
	}
	private void registgerReceiver() {
		mReceiver=new ThirdReceiver();
		IntentFilter filter=new IntentFilter("com.sxt.day07_06.order_broadcast");
		filter.setPriority(600);
		registerReceiver(mReceiver, filter);
	}
	class ThirdReceiver extends BroadcastReceiver{
		public void onReceive(Context context, android.content.Intent intent) {
			Log.i("main","ThirdReceiver.onReceive()");
		};
	}
	@Override
	protected void onDestroy() {
		super.onDestroy();
		unregisterReceiver(mReceiver);
	}
}

public class FirstReceiver extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {
		String value=intent.getStringExtra("key");
		Log.i("main","FirstReceiver.onReceive():"+value);
		setResultData("来源于FirstReceiver的文本");
	}

}

public class SecondReceiver extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {
		String value=intent.getStringExtra("key");
		String text=getResultData();
		Log.i("main","SecondReceiver.onReceive(),intent中携带的文本:"+value+","+text);
		if(isOrderedBroadcast()){
			abortBroadcast();//终止广播
		}
	}

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sxt.day07_06"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.sxt.day07_06.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="com.sxt.day07_06.FirstReceiver">
            <intent-filter android:priority="800">
                <action android:name="com.sxt.day07_06.order_broadcast"/>
            </intent-filter>
        </receiver>
        <receiver android:name="com.sxt.day07_06.SecondReceiver">
            <intent-filter android:priority="700">
                <action android:name="com.sxt.day07_06.order_broadcast"/>
            </intent-filter>
        </receiver>
    </application>

</manifest>