BroadCast两种实现方式

BroadCast两种实现方式

1.静态注册(系统广播)：

• 实现广播接收类,继承BroadcastReceiver
  
• 注册广播,在mainfreast.xml里面添加<receiver></receiver>如下:

<!-- 接收手机第一次启动广播 -->
<receiver
    android:name=".broadcast.BootReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

2.动态注册(自定义广播):

• 实现广播接收类,继承BroadcastReceiver，如：

public class DynamicReceiver extends BroadcastReceiver {
    public DynamicReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
//        throw new UnsupportedOperationException("Not yet implemented");
        Log.i("MainActivity", "接收自定义动态注册广播消息");
        if(intent.getAction().equals("com.itep.dynamicbroadcast")){
            String msg = intent.getStringExtra("msg");
            Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
        }
    }
}

• 动态注册自定义广播，一般在onStart()的时候注册，如：

//动态注册自定义广播
IntentFilter filter_dynamic = new IntentFilter();
filter_dynamic.addAction("com.itep.dynamicbroadcast");
registerReceiver(dynamicReceiver,filter_dynamic);

• 发送广播消息：

Intent intent = new Intent();
intent.setAction("com.itep.dynamicbroadcast");
intent.putExtra("msg","接收动态注册广播成功");
sendBroadcast(intent);