在registerForActivityResult方法中使用ActivityResultLauncher对象时，应该先提前请求权限，并在权限被授予时才启动ActivityResultLauncher的launch方法。以下是示例代码：

// 在Activity中定义权限请求代码 private static final int REQUEST_CODE_PERMISSIONS = 100;

// 在Activity中定义需要请求的权限 private final String[] REQUIRED_PERMISSIONS = new String[]{ Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE };

// 在Activity中定义ActivityResultLauncher对象 private final ActivityResultLauncher photoLauncher = registerForActivityResult( new ActivityResultContracts.StartActivityForResult(), result -> { // 处理ActivityResult返回的结果 } );

// 在Activity中定义权限请求Launcher对象 private final ActivityResultLauncher permissionLauncher = registerForActivityResult( new ActivityResultContracts.RequestMultiplePermissions(), permissions -> { if (permissions.containsValue(false)) { // 权限被拒绝 } else { // 权限被授予，启动photoLauncher的launch方法 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); photoLauncher.launch(intent); } } );

// 在需要启动photoLauncher的地方调用以下方法，先请求权限 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) { // 权限已经被授予，直接启动photoLauncher的launch方法 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); photoLauncher.launch(intent); } else { // 权限还没被授予，请求权限 permissionLauncher.launch(REQUIRED_PERMISSIONS); }