public static final String SCREEN_OFF_TIMEOUT = "screen_off_timeout";private final int SCREEN_TIMEOUT_VALUE_NONE = Integer.MAX_VALUE;//永不休眠private DreamBackend mBackend;//屏保管理类@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_screen_saver);mBackend = DreamBackend.getInstance(ScreenSaverActivity.this);}  /*** 三十分钟无操作后屏幕进入休眠** @param isChecked*/private void setScreenSaverEnable(boolean isChecked) {mBackend.setEnabled(isChecked);//设置开关的状态if (isChecked) {Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 1000 * 60 * 30);} else {Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, SCREEN_TIMEOUT_VALUE_NONE);}}