3

I have a wake lock set up so that I can still hear the sound when the screen times out or I press the screen lock button. From what I can understand through reading online is that I only need a partial wake lock. Here is the code but it is not working. No logcat errors

package com.androidsleepmachine.gamble;

import android.app.Activity;   
import android.content.Context;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.PowerManager;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class Ship extends Activity implements View.OnClickListener {
public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 };
public MediaPlayer mediaPlayer;
public Handler handler = new Handler();
public Button button2;
public Spinner spinner2;
private PowerManager.WakeLock wl;
// Initialize the activity
@Override
public void onCreate(Bundle savedInstanceState) { 
    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "sleeplock");
    super.onCreate(savedInstanceState);

    setContentView(R.layout.ship);
    button2 = (Button) findViewById(R.id.btn2);
    button2.setOnClickListener(this);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,  
android.R.layout.simple_spinner_item, TIME_IN_MINUTES);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);          
    spinner2.setAdapter(adapter); 
}

// Play the sound and start the timer
private void playSound(int resourceId) {
    // Cleanup any previous sound files
    cleanup();
    // Create a new media player instance and start it
    mediaPlayer = MediaPlayer.create(this, resourceId);
    mediaPlayer.start();
    // Create the timer to stop the sound after x number of milliseconds
    int selectedTime = TIME_IN_MINUTES[spinner2.getSelectedItemPosition()];
    handler.postDelayed(runnable, selectedTime * 60 * 1000);
}

// Handle button callback
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn2:
            wl.acquire();
            playSound(R.raw.ocean_ship);
            break;
    }
}
 protected void onStop()
  {

      cleanup();
      super.onStop();
  }
// Stop the sound and cleanup the media player
public void cleanup() {
    if (mediaPlayer != null) {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = null;
         wl.release();
    }
    // Cancel any previously running tasks
    handler.removeCallbacks(runnable);
}

// Runnable task used by the handler to stop the sound
public Runnable runnable = new Runnable() {
    public void run() {
        cleanup();
    }
};
}
4

2 回答 2

2

如果 Di Vero Labs 的回答解决了这个问题，我会感到惊讶，因为 Android 文档说这些额外的标志对部分唤醒锁没有任何作用。

唤醒锁就像您使用它一样简单，它应该可以工作：

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "sleeplock");
wl.acquire();
//release
wl.release();

请注意，在执行这些方法之前，您需要检查空值，并检查它是否尚未获取等，否则您可能会遇到空指针异常。

我认为您的问题是您正在调用包含唤醒锁释放的 cleanup()，因此您并没有真正持有唤醒锁。为确保此操作有效（尽管可能会导致电池耗尽问题），请先保持唤醒锁，然后在完成后释放，而不是在完成之前释放，否则您显然不会有唤醒锁。

我遇到了很多问题，因为唤醒锁无法正常工作，但我相信我已将问题归结为自定义 ROM。所以要小心！（不支持自定义 ROM，包括您自己的！）

于 2014-01-20T17:02:41.927 回答
1

Try:

wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP |
                PowerManager.ON_AFTER_RELEASE, "sleeplock");

I've found the "PowerManager.ACQUIRE_CAUSES_WAKEUP" alleviates a few of the same issues I was having.

Also make sure:

<uses-permission android:name="android.permission.WAKE_LOCK" />

is declared in your manifest.

于 2013-09-29T08:36:53.400 回答