SharedWakeLock.java :  » App » flatnote » com » androsz » util » Android Open Source

package com.androsz.util;

import android.content.Context;
import android.os.PowerManager;

/**
 * Hold a wakelock that the whole process must use. Otherwise, interferences
 * happen.
 */
public class SharedWakeLock {

  private static PowerManager.WakeLock sCpuWakeLock;

  public synchronized static void acquire(final Context context,
      int wakeLockFlags) {
    createWakeLock(context, wakeLockFlags);
    sCpuWakeLock.acquire();
  }

  public synchronized static void acquire(final Context context,
      int wakeLockFlags, int releaseAfter) {
    createWakeLock(context, wakeLockFlags);
    sCpuWakeLock.acquire(releaseAfter);
  }

  private static void createWakeLock(final Context context, int wakeLockFlags) {
    final PowerManager pm = (PowerManager) context
        .getSystemService(Context.POWER_SERVICE);
    release();
    sCpuWakeLock = pm.newWakeLock(wakeLockFlags,
        SharedWakeLock.class.getSimpleName());
    sCpuWakeLock.setReferenceCounted(false);
  }

  public static boolean isHeld() {
    return sCpuWakeLock != null && sCpuWakeLock.isHeld();
  }

  public static void release() {
    if (isHeld()) {
      sCpuWakeLock.release();
    }
  }
}