Android BroadcastReceiver 行为

Question

我有一个普通的 java 类（不是 Activity），它实现了我的应用程序的一个元素，包括一个带有 2 个动作的通知：第一个动作触发一个 PendingIntent 启动一个全新的活动，而另一个广播一个意图，它将陷入扩展 BroadcastReceiver 的 Receiver 类中，一切顺利（现在只播放 RAW 目录中的声音） 由于我需要更新在第一个 java 类中实现的对象的特定方面，我将接收器放在我的类中，以这种方式扩展 BroadcastReceiver，但根本不播放测试声音。 onReceive 方法中的代码在两个类中是相同的。

SingleInstance.java

package com.thepier.ingresstimer;

*various imports*
public class SingleInstance extends BroadcastReceiver {

/* Notification Misc */
private int ID;
private NotificationManager nm;

/* App context */
private Context cntx;

/* Contatore */
private int intCounter = 0;

/* Portal Data */
private int hackMax = 4; /* hackMax minimo */
private long coolTime = 300000; /* millisecondi = 5 minuti */
private long burnTime = 14400000; /* millisecondi = 4 ore */

/* Portal Cooldowns */
CountDownTimer cooldownTimer;
CountDownTimer burnoutTimer;

*other code*

public void showNotification () {

    Intent intentPref = new Intent(cntx, PreferencesActivity.class);
    PendingIntent pIntent1 = PendingIntent.getActivity(cntx, 0, intentPref, 0);

    Intent intentHack = new Intent(cntx, SingleInstance.class);
    //OR Intent intentHack = new Intent(cntx, HackReceiver.class);
    intentHack.putExtra("ID", this.ID);
    intentHack.putExtra("maxH", this.hackMax);
    intentHack.putExtra("curH", this.intCounter);
    PendingIntent pIntent2 = PendingIntent.getBroadcast(cntx, 0, intentHack, 0);

    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(cntx)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("Cooldown terminato")
            .setTicker("Cooldown terminato")
            .addAction(R.drawable.ic_action_new, "Hack", pIntent2)
            .addAction(R.drawable.ic_action_settings, "Impostazioni", pIntent1)
            .setContentText("Hack: "+intCounter+"/"+hackMax);

    nm.notify(ID, mBuilder.build());
}

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.sfx_portal_hacking_alien);
    mediaPlayer.start();
}
}

HackReceiver.java

package com.thepier.ingresstimer;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;

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

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
            // TODO Auto-generated method stub
            MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.sfx_portal_hacking_alien);
            mediaPlayer.start();


    }
}

Answer 1

问题解决：忘记了 BroadcastReceiver 需要的空构造函数