悬浮窗 权限

/**
 * 判断是有悬浮框权限
 * @return
 */
public static boolean canDrawOverlays(Context context) {
  try {
    return Settings.canDrawOverlays(context);
  } catch (NoSuchMethodError e) {
  }
}
/**
 * 判断是否缺少权限
 * @param permission
 * @return
 */
public static boolean checkSelfPermission(String permission) {
  return ContextCompat.checkSelfPermission(ApplicationContext.getInstance(), "android.permission.SYSTEM_ALERT_WINDOW") ==
      PackageManager.PERMISSION_GRANTED;
}


public static boolean checkPermission(String permission) {

  return (PackageManager.PERMISSION_GRANTED ==
      ApplicationContext.getInstance().getPackageManager().checkPermission("android.permission.SYSTEM_ALERT_WINDOW", ApplicationContext.getInstance().getPackageName()));

}


/**
 * 4.4 以上可以直接判断准确
 *
 * 4.4 以下非MIUI直接返回true
 *
 * 4.4 以下MIUI 可 判断 上一次打开app 时 是否开启了悬浮窗权限
 *
 * @param context
 * @return
 */
//OP_SYSTEM_ALERT_WINDOW=24   op = 24
public static boolean checkOp(Context context, int op) {
  final int version = Build.VERSION.SDK_INT;

  if (version >= 19) {
    AppOpsManager manager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
    try {

      Class<?> spClazz = Class.forName(manager.getClass().getName());
      Method method = manager.getClass().getDeclaredMethod("checkOp", int.class, int.class, String.class);
      int property = (Integer) method.invoke(manager, op,
          Binder.getCallingUid(), context.getPackageName());

      if (AppOpsManager.MODE_ALLOWED == property) {
        return true;
      } else {
        return false;
      }
    } catch (Exception e) {

    }
  } else {

  }
  return true;
}


/**
 * 判断 悬浮窗口权限是否打开
 *
 * @param context
 * @return true 允许  false禁止
 */
public static boolean getAppOps(Context context) {
  try {
    Object object = context.getSystemService("appops");
    if (object == null) {
      return false;
    }
    Class localClass = object.getClass();
    Class[] arrayOfClass = new Class[3];
    arrayOfClass[0] = Integer.TYPE;
    arrayOfClass[1] = Integer.TYPE;
    arrayOfClass[2] = String.class;
    Method method = localClass.getMethod("checkOp", arrayOfClass);
    if (method == null) {
      return false;
    }
    Object[] arrayOfObject1 = new Object[3];
    arrayOfObject1[0] = Integer.valueOf(24);
    arrayOfObject1[1] = Integer.valueOf(Binder.getCallingUid());
    arrayOfObject1[2] = context.getPackageName();
    int m = ((Integer) method.invoke(object, arrayOfObject1)).intValue();
    return m == AppOpsManager.MODE_ALLOWED;
  } catch (Exception ex) {

  }
  return false;
}