android-WakeLock无法正常工作

我设置了唤醒锁定,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,我了解到的是,我只需要部分唤醒锁即可.这是代码,但是不起作用.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();
    }
};
}

解决方法:

如果Di Vero Labs的答案解决了这个问题,我会感到很惊讶,因为Android文档说这些附加标志在部分唤醒状态下不起作用.

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,您将需要检查null,并检查是否已获取null,否则您可能会得到null指针异常.

我认为您的问题是您正在调用cleanup(),其中包括唤醒锁版本,因此您实际上并没有持有唤醒锁.为确保此方法有效(尽管可能会导致电池耗电问题),请提前握住唤醒锁,然后在完成操作后释放,而不是在完成之前释放,否则显然您将没有唤醒锁.

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归结为自定义ROM.所以要当心！ (不要支持自定义ROM,包括您自己的ROM！)

标签：wakelock,android
来源： https://codeday.me/bug/20191011/1893762.html