我设置了唤醒锁,这样当屏幕超时或按下屏幕锁定按钮时我仍然可以听到声音。通过在线阅读我可以理解的是,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();
}
};
}
最佳答案
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(),因此您实际上并没有持有唤醒锁。为确保此功能有效(尽管可能会导调用池耗尽问题)预先保持唤醒锁,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,但相信我已将问题确定为自定义 ROM。所以当心! (不支持自定义 ROM,包括您自己的!)
关于android - 唤醒锁不工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19074074/