BroadcastReceiver的两种注册方式（静态注册和动态注册）

静态注册就是在AndroidManifest.xml文件中定义，注册的广播接收器必须继承BroadReceiver

动态注册就是在程序中使用Context.registerReceiver注册。

发送广播事件：通过Context.sendBroadcast来发送，由Intent来传递注册时用到的Action。

接收广播：当发送的广播被接收器监听到后，会调用onReceive()方法，并将包含消息的Intent对象传回。

使用案例：

1、结构图：

2、Sample2-1_Activity.java代码如下：

packagecom.bn.ex2_1;
importandroid.app.Activity;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.IntentFilter;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.Toast;
publicclass Sample2_1_Activity extendsActivity {
    privateButton sendStaticButton;    //发送自定义静态注册广播的按钮
    privateButton sendDynamicButton;   //发送自定义动态注册广播的按钮
    privatestatic final String STATICACTION = "com.bn.pp2.staticreceiver";//静态广播的Action字符串
    privatestatic final String DYNAMICACTION = "com.bn.pp2.dynamicreceiver";  //动态广播的Action字符串
    @Override
    publicvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        sendStaticButton = (Button) findViewById(R.id.send_static);     //获取Button按钮引用
        sendDynamicButton = (Button) findViewById(R.id.send_dynamic);
        sendStaticButton.setOnClickListener(newDIYOnClickListener());  //为Button按钮添加监听器
        sendDynamicButton.setOnClickListener(newDIYOnClickListener());
    }
    classDIYOnClickListener implementsOnClickListener{        //内部类OnClick监听器
        publicvoid onClick(View v) {
            if(v.getId() == R.id.send_static){      // 发送自定义静态注册广播消息
                Intent intent = newIntent();
                intent.setAction(STATICACTION);    //设置Action
                intent.putExtra("msg","接收静态注册广播成功！"); //添加附加信息
                sendBroadcast(intent);             //发送Intent
            }
            elseif(v.getId() == R.id.send_dynamic){    // 发送自定义动态注册广播消息
                Intent intent = newIntent();
                intent.setAction(DYNAMICACTION);       //设置Action
                intent.putExtra("msg","接收动态注册广播成功！");     //添加附加信息
                sendBroadcast(intent);                 //发送Intent
    }}}
    @Override
    protectedvoid onStart() {
        super.onStart();
        IntentFilter dynamic_filter = newIntentFilter();
        dynamic_filter.addAction(DYNAMICACTION);           //添加动态广播的Action
        registerReceiver(dynamicReceiver, dynamic_filter);  // 注册自定义动态广播消息
    }

    privateBroadcastReceiver dynamicReceiver               //动态广播的Receiver
    =newBroadcastReceiver() {
        @Override
        publicvoid onReceive(Context context, Intent intent) {
            if(intent.getAction().equals(DYNAMICACTION)){  //动作检测
                String msg = intent.getStringExtra("msg");
                Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
}}};}

3、AndroidManifest.xml代码如下：

<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
      android:versionCode="1"
      android:versionName="1.0"package="com.bn.ex2_1">
    <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
        <activityandroid:name=".Sample2_1_Activity"android:label="@string/app_name">
            <intent-filter>
                <actionandroid:name="android.intent.action.MAIN"/>
                <categoryandroid:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- 注册自定义静态广播接收器 -->
        <receiverandroid:name=".StaticReceiver">
            <intent-filter>
                <actionandroid:name="com.bn.pp2.staticreceiver"/>
            </intent-filter>
        </receiver>
    </application>
</manifest>

4、StaticReceiver.java代码如下：

packagecom.bn.ex2_1;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.widget.Toast;
publicclass StaticReceiver extendsBroadcastReceiver {
    @Override      //静态广播接收器执行的方法
    publicvoid onReceive(Context context, Intent intent) {
        String msg = intent.getStringExtra("msg");
        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
}}

5、main.xml代码如下：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns: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:textSize="24dip"
        android:gravity="center"
        android:text="BroadcastReceiver演示"/>
    <Button
        android:id="@+id/send_static"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送自定义静态注册广播"/>
    <Button
        android:id="@+id/send_dynamic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送自定义动态注册广播"/>
</LinearLayout>