android中如何发送一个广播

               

1.首先要声明广播

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){ @Override public void onReceive(Context context, Intent intent) //onReceive函数不能做耗时的事情，参考值：10s以内 {  Log.d("scott", "on receive action="+intent.getAction());  String action = intent.getAction();  if (action.equals("com.scott.sayhi"))  {   showDialog("on receive action="+intent.getAction());  } }};

2.其次要注册广播，有两种方式：xml注册和代码注册

xml注册：

<receiver android:name="com.scott.sayhi.MyBroadcastReceiver" >
<intent-filter>
<action android:name="com.scott.sayhi" />
</intent-filter>
</receiver>

代码注册：

IntentFilter filter = new IntentFilter();
filter.addAction("com.scott.sayhi");
MyActivity.this.registerReceiver(mBroadcastReceiver, filter);

上述2个步骤就可以了。

3.发送广播

Intent intent = new Intent();intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction("com.scott.sayhi");MyActivity.this.sendBroadcast(intent);

4.收听开机广播

intent-filter设置如下即可

<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>

           

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