Broadcast Reveiver作用

Broadcast Reveiver作用以及为何要引入（用来接收系统以及自定义消息的）
在系统内通知和判定执行状态
1，系统执行状态，开机了，TF卡插拔，准备关机，电量低了，
2，自定义执行状态，发消息提示更新界面

点击后会打log：顺序是testbroadcast2，testbroadcast

activity代码-----

[java]
package com.paoyx;
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 BroadcastActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //设置按钮
        Button button = new Button(this);
        button.setText("send message");
        setContentView(button);
        button.setOnClickListener(new OnClickListener() {
            //按钮点击事件
            public void onClick(View v) {
                //设置intent传递数值
                Intent intent = new Intent();
                intent.setAction("com.paoyx.broadcast");
                sendBroadcast(intent);
            }
        });
    }
}

package com.paoyx;
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 BroadcastActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //设置按钮
        Button button = new Button(this);
        button.setText("send message");
        setContentView(button);
        button.setOnClickListener(new OnClickListener() {
   //按钮点击事件
   public void onClick(View v) {
    //设置intent传递数值
    Intent intent = new Intent();
    intent.setAction("com.paoyx.broadcast");
    sendBroadcast(intent);
   }
  });
    }
}
2个receiver代码---

[html]
package com.paoyx;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyReceiver extends BroadcastReceiver {
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (intent.getAction().equals("com.paoyx.broadcast")) {
            Log.i("log","testbroadcast");
        }
    }
}

package com.paoyx;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub
  if (intent.getAction().equals("com.paoyx.broadcast")) {
   Log.i("log","testbroadcast");
  }
}
}
[html]
package com.paoyx;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyReceiver2 extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (intent.getAction().equals("com.paoyx.broadcast")) {
            Log.i("log","testbroadcast2");
        }
    }
}

[html]
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.paoyx"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk android:minSdkVersion="8" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".BroadcastActivity"
            android:label="@string/app_name" >
            <inten

补充：移动开发 , Android ,