WakeLock无法正常工作

时间:2013-09-29 03:22:16

标签: android wakelock

我设置了唤醒锁,以便在屏幕超时或按屏幕锁定按钮时仍能听到声音。通过在线阅读我能理解的是,我只需要部分唤醒锁。这是代码,但它不起作用。没有logcat错误

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();
    }
};
}

2 个答案:

答案 0 :(得分:0)

如果Di Vero Labs的答案解决了这一点,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无效。

唤醒锁就像你使用它一样简单,它应该有效:

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,并检查它是否已被获取,否则您可能会收到空指针异常。

我认为你的问题是你正在调用cleanup(),其中包括wakelock发布,所以你并没有真正拿着唤醒锁。为了确保这一点(虽然可能会导致电池耗尽问题)提前拿着你的唤醒锁,然后在你完成时释放,而不是在你完成之前,你显然没有唤醒锁。

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解决为自定义ROM。所以要小心! (DONT支持自定义ROM,包括您自己的ROM!)

答案 1 :(得分:-1)

尝试:

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

我发现“PowerManager.ACQUIRE_CAUSES_WAKEUP”缓解了我遇到的一些问题。

还要确保:

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

在你的清单中声明。