Wake Lock是Android系统中一种防止设备进入睡眠状态的功能。要使用Wake Lock,您需要在应用中请求相应的权限,并在代码中创建一个WakeLock实例。以下是一个简单的示例,说明如何使用Wake Lock解决Android设备在运行应用时自动进入睡眠状态的问题:
<uses-permission android:name="android.permission.WAKE_LOCK" />
private static final int REQUEST_WAKE_LOCK_PERMISSION = 1;
private void requestWakeLockPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!checkSelfPermission(Manifest.permission.WAKE_LOCK)) {
requestPermissions(new String[]{Manifest.permission.WAKE_LOCK}, REQUEST_WAKE_LOCK_PERMISSION);
} else {
acquireWakeLock();
}
} else {
acquireWakeLock();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == REQUEST_WAKE_LOCK_PERMISSION) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
acquireWakeLock();
} else {
Toast.makeText(this, "Permission not granted!", Toast.LENGTH_SHORT).show();
}
}
}
acquireWakeLock()
方法中创建一个WakeLock实例:private void acquireWakeLock() {
PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyApp::WakeLock");
} else {
wakeLock = powerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "MyApp::WakeLock");
}
if (wakeLock != null && wakeLock.isHeld()) {
wakeLock.release();
}
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyApp::WakeLock");
wakeLock.setReferenceCounted(false);
wakeLock.acquire();
}
现在,当您的应用获得Wake Lock权限时,设备将不会在运行应用时自动进入睡眠状态。请注意,长时间持有Wake Lock可能会导致电池消耗增加,因此请确保在不需要时释放它。