要用itellij工具自动生成，要不手写很是麻烦。
千万不要整错了权限，否则很是狼狈，我就忙活了一晚上也没得吃结果。
自动生成一下代码。
@NeedsPermission(Manifest.permission.CAMERA) void showCamera() { getSupportFragmentManager().beginTransaction() .replace(R.id.sample_content_fragment, CameraPreviewFragment.newInstance()) .addToBackStack("camera") .commitAllowingStateLoss(); } @OnShowRationale(Manifest.permission.CAMERA) void showRationaleForCamera(final PermissionRequest request) { new AlertDialog.Builder(this) .setMessage(R.string.permission_camera_rationale) .setPositiveButton(R.string.button_allow, (dialog, button) -> request.proceed()) .setNegativeButton(R.string.button_deny, (dialog, button) -> request.cancel()) .show(); } @OnPermissionDenied(Manifest.permission.CAMERA) void showDeniedForCamera() { Toast.makeText(this, R.string.permission_camera_denied, Toast.LENGTH_SHORT).show(); } @OnNeverAskAgain(Manifest.permission.CAMERA) void showNeverAskForCamera() { Toast.makeText(this, R.string.permission_camera_neverask, Toast.LENGTH_SHORT).show(); } @Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); // NOTE: delegate the permission handling to generated method MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);}下面这个段代码要等编译以后才不会报错，简单运行一下吧。貌似工具生成的是错误的，
@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button_camera).setOnClickListener(v -> { // NOTE: delegate the permission handling to generated method MainActivityPermissionsDispatcher.showCameraWithPermissionCheck(this); });}
小米手机以及虚拟机，
@OnShowRationale
这个方法没有反应，不知道为啥。