Intent intent = new Intent();
intent.putExtra("msg","hello,world!");
sendBroadcast(intent);
创建广播接收器
public class BatteryBroadcastReceiver extend BroadcastReceiver {
private Activity activity;
public DemoRecceiver(Activity activity) {
this.activity = activity;
}
@Override
public void onReceive(Context context, Intent intent) {
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
// 在BroadReceiver中直接修改UI
((TextView)activity.findViewById(R.id.tv1)).setText("当前电量：" + persent);
Log.e("onReceive:", "当前电量:" + persent);
}
}
注册广播接收器
静态注册（在AndroidManifest.xml中注册）
动态注册Android8.0（API26）之后某些广播不能静态注册详细参照隐式广播例外情况
// 创建广播接收器实例
BatteryBroadcastReceiver receiver = new BatteryBroadcastReceiver(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置频道
IntentFilter intentFilter = new IntentFilter();
intentFilter.setAction(Intent.ACTION_EXTRA_BATTER);
// 注册广播
registerBroadcast(receiver,intentFilter);
}
注销广播接收器
@Override
protected void onDestroy() {
super.onDestroy();
// 注销广播
unregisterReceiver(receiver);
}
