android手机锁屏后GPS模块发出的NMEA数据频率降低

        做了一个接收手机GPS模块发出的NMEA数据，然后解析数据，将数据发送给其他App的App。但是发现当android手机睡眠之后（即黑屏状态），发出的NMEA频率大大降低了，大概40秒才会发出一次数据。

        解决的方法是，打开App时，拿到睡眠锁，App退出时，释放睡眠锁。代码如下：

public class WakeLockManager {

    public final static String TAG = "WakeLockManager";

    private static WakeLockManager instance = null;

    private PowerManager.WakeLock wakeLock = null;

    private WakeLockManager(){

    }

    public static WakeLockManager getInstance() {

        if (instance == null) {

            synchronized (WakeLockManager.class) {

                if (instance == null) {

                    instance = new WakeLockManager();

                }

            }

        }

        return instance;

    }

    public void acquire(Context context) {

        if (null == wakeLock) {

            PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);

            wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK

                    | PowerManager.ON_AFTER_RELEASE, context.getClass()

                    .getCanonicalName());

            wakeLock.acquire();

            L.i(TAG + "call acquireWakeLock");

        }

    }

    // 释放设备电源锁

    public void release() {

        if (null != wakeLock && wakeLock.isHeld()) {

            Log.i(TAG, "call releaseWakeLock");

            wakeLock.release();

            wakeLock = null;

        }

    }

}