BroadcastReceiver广播事件

第一种：在代码中配置注册广播
`
IntentFilter inf = new IntentFilter();
inf.addAction("cm.example.android5module_broadcastreceiver_action");
registerReceiver(new ActivityReceiver(), inf);//注册接收器
registerReceiver(br, inf);//注册接收器

第二种：在配置文件中配置广播

<receiver
android:name=".ActivityReceiver"
>
<intent-filter >
<action android:name="cm.example.android5module_broadcastreceiver_action"/>
</intent-filter>
</receiver>

Intent intent = new Intent();
intent.setAction("cm.example.android5module_broadcastreceiver_action");
sendBroadcast(intent);

3、MainActivity代码如下：

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.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

Button bt;
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

bt = (Button)this.findViewById(R.id.button);
tv = (TextView)this.findViewById(R.id.textview);
//处理广播发过来的数据
ActivityReceiver.handler = new Handler(){
public void handleMessage(Message msg) {
if(msg.what == 0x112){
tv.append(msg.obj.toString());
}

}
};
//广播做出的反应，也可单独放在一个类中。放在本类中只能为代码配置的广播做出反应。因为配置文件里配置的广播要求是单独的类。
final BroadcastReceiver br = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals("cm.example.android5module_broadcastreceiver_action")){
String str = "Yes";
Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
}

}
};
bt.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
//第一种：代码中注册广播
IntentFilter inf = new IntentFilter();
inf.addAction("cm.example.android5module_broadcastreceiver_action");
registerReceiver(new ActivityReceiver(), inf);//注册接收器
registerReceiver(br, inf);//注册接收器

//第二种：在配置文件Manifest.xml中配置receiver
/*
*  <receiver
android:name=".ActivityReceiver"
>
<intent-filter >
<action android:name="cm.example.android5module_broadcastreceiver_action"/>
</intent-filter>
</receiver>* */

//发送广播
Intent intent = new Intent();
intent.setAction("cm.example.android5module_broadcastreceiver_action");
sendBroadcast(intent);}

});

}
}

4、ActivityReceiver代码如下：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;

public class ActivityReceiver extends BroadcastReceiver{

public static Handler handler;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(action.equals("cm.example.android5module_broadcastreceiver_action")){
Message msg = new Message();
msg.what = 0x112;
msg.obj = "alreadyreceiver";
handler.sendMessage(msg);
}
}
}

5、activity_main.xml如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="发送广播"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:id="@+id/textview"
/>

</LinearLayout>