每次后台服务触发时，在主活动中获取更新

Question

我有

public class Backgroundservice implements AlarmReceiverCallback {
private Context context;
public Backgroundservice(Context context) {
this.context = context;
}
@Override
public void onAlarmReceived() {
//interface trigger
}}

现在我想在我的MainActivity类中扩展Backgroundservice，该类扩展了 AppCompatActivity。

所以一旦后台服务中的接口被触发，我就可以在主活动中使用我的方法

Answer 1

您可以使用BroadCastReceiver

在你服务课上

public class Backgroundservice implements AlarmReceiverCallback {
private Context context;
public Backgroundservice(Context context) {
this.context = context;
}
@Override
public void onAlarmReceived() {
// send broadcast from here
Intent intent  = new Intent("alaram_received");
context.sendBroadcast(intent);
}

并在您的主活动中接收此广播。

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Register Receiver
IntentFilter intentFilter = new IntentFilter("alaram_received");
registerReceiver(alarm_receiver,intentFilter); 
}
BroadcastReceiver alarm_receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// refresh Token
}
};
}

快乐编码。

Answer 2

我设法通过创建新界面来使其工作

public interface ReceiverCallback {
public void onReceived();}

并在我的主要活动中实现，而不是在内部创建它的新对象

@Override
public void onReceive(Context context, Intent intent)