广播机制BroadCastReceiver

BroadCastReceiver-----广播接收器

BroadCastReceiver接收短信，电话等android系统发出的事件，BroadCastReceiver针对接收的事件作出相应的处理。

两种注册方法

在Manifiest.xml中注册
特点：
即使应用程序是关还是开，都处于活动状态
例如，监听电池的耗电量等类似的程序

package com.yanjun;

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

public class TestReceiver extends BroadcastReceiver{
//接受广播的处理事件
public TestReceiver() {
System.out.println("TestReceiver中的消息");
}

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
System.out.println("复写onReceive（）");
}

}

package com.yanjun;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
Button button ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new BroadcastListenner());

}
class BroadcastListenner implements OnClickListener{

public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setAction(Intent.ACTION_EDIT);
MainActivity.this.sendBroadcast(intent);
}

}
}

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

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".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>
<!--广播注册 对比action事件是否一致-->
<receiver android:name=".TestReceiver">
<intent-filter>
<!--
android.intent.action.EDIT要与MainActivity中的intent.setAction(Intent.ACTION_EDIT);保持一致
-->
<action android:name="android.intent.action.EDIT" />
</intent-filter>
</receiver>

</application>
</manifest>

在应用程序的代码中注册
特点
采用该形式可以用来监听控件的运行状态