Java 类com.facebook.react.modules.core.PermissionAwareActivity 实例源码

private PermissionAwareActivity getPermissionAwareActivity() {
  Activity activity = getCurrentActivity();
  if (activity == null) {
    throw new IllegalStateException("Tried to use permissions API while not attached to an " +
        "Activity.");
  } else if (!(activity instanceof PermissionAwareActivity)) {
    throw new IllegalStateException("Tried to use permissions API but the host Activity doesn't" +
        " implement PermissionAwareActivity.");
  }
  return (PermissionAwareActivity) activity;
}

private PermissionAwareActivity getPermissionAwareActivity() {
  Activity activity = getCurrentActivity();
  if (activity == null) {
    throw new IllegalStateException("Tried to use permissions API while not attached to an " +
        "Activity.");
  } else if (!(activity instanceof PermissionAwareActivity)) {
    throw new IllegalStateException("Tried to use permissions API but the host Activity doesn't" +
        " implement PermissionAwareActivity.");
  }
  return (PermissionAwareActivity) activity;
}

/**
 * Request the given permission. successCallback is called with true if the permission had been
 * granted, false otherwise. For devices before Android M, this instead checks if the user has
 * the permission given or not.
 * See {@link Activity#checkSelfPermission}.
 */
@ReactMethod
public void requestPermission(final String permission, final Promise promise) {
  Context context = getReactApplicationContext().getBaseContext();
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
    promise.resolve(context.checkPermission(permission, Process.myPid(), Process.myUid()) ==
            PackageManager.PERMISSION_GRANTED);
    return;
  }
  if (context.checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED) {
    promise.resolve(true);
    return;
  }

  try {
    PermissionAwareActivity activity = getPermissionAwareActivity();

    mCallbacks.put(
      mRequestCode, new Callback() {
        @Override
        public void invoke(Object... args) {
          promise.resolve(args[0].equals(PackageManager.PERMISSION_GRANTED));
        }
      });

    activity.requestPermissions(new String[]{permission}, mRequestCode, this);
    mRequestCode++;
  } catch (IllegalStateException e) {
    promise.reject(ERROR_INVALID_ACTIVITY, e);
  }
}

private PermissionAwareActivity getPermissionAwareActivity() {
  Activity activity = getCurrentActivity();
  if (activity == null) {
    throw new IllegalStateException("Tried to use permissions API while not attached to an " +
        "Activity.");
  } else if (!(activity instanceof PermissionAwareActivity)) {
    throw new IllegalStateException("Tried to use permissions API but the host Activity doesn't" +
        " implement PermissionAwareActivity.");
  }
  return (PermissionAwareActivity) activity;
}