10.在Android4.4以上的系统中判断某项权限是否被允许还是拒绝

         /*
	 * 检查某项权限是否被允许还是拒绝
	 * 
	 * @param context
	 * @param op
	 *            权限代码
	 * @return 1为拒绝，0为允许
	 */
	@TargetApi(19)
	private int checkOp(Context context, int op) {
		final int version = Build.VERSION.SDK_INT;
		if (version >= 19) {
			try {
				AppOpsManager appOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
				Method dispatchMethod = AppOpsManager.class.getMethod(
						"checkOp", new Class[] { int.class, int.class,
								String.class });
				int mode = (Integer) dispatchMethod.invoke(
						appOpsManager,
						new Object[] { op, Binder.getCallingUid(),
								context.getPackageName() });
				return mode;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return -1;
	}

其中op字段可以为如下的值:

 public static final int OP_FINE_LOCATION = 1;
    /** @hide Causing GPS to run. */
    public static final int OP_GPS = 2;
    /** @hide */
    public static final int OP_VIBRATE = 3;
    /** @hide */
    public static final int OP_READ_CONTACTS = 4;
    /** @hide */
    public static final int OP_WRITE_CONTACTS = 5;
    /** @hide */
    public static final int OP_READ_CALL_LOG = 6;
    /** @hide */
    public static final int OP_WRITE_CALL_LOG = 7;
    /** @hide */
    public static final int OP_READ_CALENDAR = 8;
    /** @hide */
    public static final int OP_WRITE_CALENDAR = 9;
    /** @hide */
    public static final int OP_WIFI_SCAN = 10;
    /** @hide */
    public static final int OP_POST_NOTIFICATION = 11;
    /** @hide */
    public static final int OP_NEIGHBORING_CELLS = 12;
    /** @hide */
    public static final int OP_CALL_PHONE = 13;
    /** @hide */
    public static final int OP_READ_SMS = 14;
    /** @hide */
    public static final int OP_WRITE_SMS = 15;
    /** @hide */
    public static final int OP_RECEIVE_SMS = 16;
    /** @hide */
    public static final int OP_RECEIVE_EMERGECY_SMS = 17;
    /** @hide */
    public static final int OP_RECEIVE_MMS = 18;
    /** @hide */
    public static final int OP_RECEIVE_WAP_PUSH = 19;
    /** @hide */
    public static final int OP_SEND_SMS = 20;
    /** @hide */
    public static final int OP_READ_ICC_SMS = 21;
    /** @hide */
    public static final int OP_WRITE_ICC_SMS = 22;
    /** @hide */
    public static final int OP_WRITE_SETTINGS = 23;
    /** @hide */
    public static final int OP_SYSTEM_ALERT_WINDOW = 24;
    /** @hide */
    public static final int OP_ACCESS_NOTIFICATIONS = 25;
    /** @hide */
    public static final int OP_CAMERA = 26;
    /** @hide */
    public static final int OP_RECORD_AUDIO = 27;
    /** @hide */
    public static final int OP_PLAY_AUDIO = 28;
    /** @hide */
    public static final int OP_READ_CLIPBOARD = 29;
    /** @hide */
    public static final int OP_WRITE_CLIPBOARD = 30;
    /** @hide */
    public static final int OP_TAKE_MEDIA_BUTTONS = 31;
    /** @hide */
    public static final int OP_TAKE_AUDIO_FOCUS = 32;
    /** @hide */
    public static final int OP_AUDIO_MASTER_VOLUME = 33;
    /** @hide */
    public static final int OP_AUDIO_VOICE_VOLUME = 34;
    /** @hide */
    public static final int OP_AUDIO_RING_VOLUME = 35;
    /** @hide */
    public static final int OP_AUDIO_MEDIA_VOLUME = 36;
    /** @hide */
    public static final int OP_AUDIO_ALARM_VOLUME = 37;
    /** @hide */
    public static final int OP_AUDIO_NOTIFICATION_VOLUME = 38;
    /** @hide */
    public static final int OP_AUDIO_BLUETOOTH_VOLUME = 39;
    /** @hide */
    public static final int OP_WAKE_LOCK = 40;
    /** @hide Continually monitoring location data. */
    public static final int OP_MONITOR_LOCATION = 41;
    /** @hide Continually monitoring location data with a relatively high power request. */
    public static final int OP_MONITOR_HIGH_POWER_LOCATION = 42;
    /** @hide */
    public static final int _NUM_OP = 43;