正文
Android 使用BroadcastReceiver的几种方法
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发送自定义广播
全局广播
-
发送标准广播
1.定义广播接收器.(在发送广播前,需要先定义一个广播接收器,不然发了也是白发)
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
}
}
2.在AndroidManifest.xml里面注册.这里我们会让我们定义好的广播接收器接收一条为"com.example.broadcasttest.MY_BROADCAST"的自定义广播.
<receiver android:name="com.example.broadcasttest.MyBroadcastReceiver" >
<intent-filter >
<action android:name="com.example.broadcasttest.MY_BROADCAST"/>
</intent-filter>
</receiver>
3.然后我们写一个触发事件手动的把广播发出去.
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST");
sendBroadcast(intent);
}
});
- 发送有序广播
1.新建一个广播接收器.
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
}
}
2.我们在AndroidManifest.xml文件对广播进行注册.
<receiver android:name="com.example.broadcasttest.MyBroadcastReceiver" >
<intent-filter >
<action android:name="com.example.broadcasttest.MY_BROADCAST"/>
</intent-filter>
</receiver>
3.然后我们写一个触发事件手动的把广播发出去.
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST"); sendOrderedBroadcast(intent, null);
}
});
看到这里一定有人让位标准广播和有序广播是相同的,其实不是.sendOrderedBroadcast(intent, null);"这里我们的方法该成了sendOrderedBroadcast();还有不要忘记了这个时候我们发送的是有序广播,有序广播是可以截断的.优先级高的广播接收器可以截断广播,以阻止其继续传播.
- 设置广播接收器的优先级,android:priority="";
<receiver
android:name="com.example.broadcasttest.MyBroadcastReceiver" >
<intent-filter android:priority="100">
<action android:name="com.example.broadcasttest.MY_BROADCAST"/>
</intent-filter>
</receiver>
- 截断广播
@Override
public void onReceive(Context context, Intent intent) {
abortBroadcast(); //截断广播
}
使用本地广播
public class MainActivity extends Activity {
private IntentFilter intentFilter;
private Button button;
private LocalBroadcastManager localBroadcastManager;
private LocalReceiver localReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
localBroadcastManager=LocalBroadcastManager.getInstance(this); //获取实例
button=(Button) findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent("com.example.broadcasttest.LOCAL_BROADCAST");
localBroadcastManager.sendBroadcast(intent); //发送本地广播
}
});
intentFilter=new IntentFilter();
intentFilter.addAction("com.example.broadcasttest.LOCAL_BROADCAST");
localReceiver=new LocalReceiver();
localBroadcastManager.registerReceiver(localReceiver, intentFilter); //注册本地广播监听器
}
@Override
protected void onDestroy() {
super.onDestroy();
localBroadcastManager.unregisterReceiver(localReceiver);
}
class LocalReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "1", Toast.LENGTH_LONG).show();
}
}
}
可以看到他和我们的上面提到的差不多.只不过现在是首先通过LocalBroadcastManager的getInstance(this);得到它的实例,然后在注册广播接收器的时候调用的是localBroadcastManager的registerReceiver();方法.在发送广播的时候调用的是localBroadcastManager的sendBroadcast(intent);方法.
