android BroadcastReceiver应用举例

/************************** 动态注册 ***********************************/

TextMain.java

package lxy.litsoft;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class TestMain extends Activity {BroadcastReceiver bcr;//声明一个广播接收器Button btSendMessage;//声明一个按钮public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                //实例化广播接收器对象        bcr = new BroadcastReceiver(){public void onReceive(Context context, Intent intent) {Log.d("test", "^-^, Have received Massage!");}        };                //实例化按键对象并为其添加监听器        btSendMessage = (Button)findViewById(R.id.button01);        btSendMessage.setOnClickListener(new ButtonListener());    }class ButtonListener implements OnClickListener{public void onClick(View v) {//当点击按钮的时候，就发送广播Intent intent = new Intent();intent.setAction("ABC");sendBroadcast(intent);}}protected void onStart() {super.onStart();//注册广播接收器（动态注册）IntentFilter filter = new IntentFilter();filter.addAction("ABC");this.registerReceiver(bcr, filter);}protected void onStop() {super.onStop();//取消注册广播接收器this.unregisterReceiver(bcr);}  }

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /><Buttonandroid:id="@+id/button01"android:text="SendMessage"android:layout_width="wrap_content"android:layout_height="wrap_content"></Button></LinearLayout>

/***************************************** 静态注册 ********************************************/

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="lxy.litsoft"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="8" />    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".TestMain"                  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="MyBroadcastReciever"><intent-filter><action android:name="ABC"></action></intent-filter></receiver>    </application></manifest>

TestMain.java

package lxy.litsoft;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 TestMain extends Activity {Button btSendMessage;//声明一个按钮public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btSendMessage = (Button)findViewById(R.id.button01);        btSendMessage.setOnClickListener(new ButtonListener());    }class ButtonListener implements OnClickListener{public void onClick(View v) {//当点击按钮的时候，就发送广播Intent intent = new Intent();intent.setAction("ABC");sendBroadcast(intent);}} }

MyBroadcastReciever.java

package lxy.litsoft;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class MyBroadcastReciever extends BroadcastReceiver{public void onReceive(Context context, Intent intent) {Log.d("test", "^-^, Have received Massage!");}}

动态注册和静态注册一个BroadcastReceiver的区别：

动态注册较静态注册灵活。实验证明：当静态注册一个BroadcastReceiver时，不论应用程序是启动与否。都可以接受对应的广播。

动态注册的时候，如果不执行unregisterReceiver();方法取消注册，跟静态是一样的。但是如果执行该方法，当执行过以后，就不能接受广播了。