使用 registerForActivityResult 访问相机时出现 ActivityNotFoundException

Question

我的 API 28 应用程序在尝试使用 registerForActivityResult 使用相机（在模拟器和真实设备中）拍摄照片时抛出此 ActivityNotFoundException：“没有找到处理 Intent 的活动 { act=android.media.action.IMAGE_CAPTURE typ= image/jpg flg=0x3 clip={text/uri-list U:content://..."

`公共class IntentHelper {

private static final String AUTHORITY = BuildConfig.APPLICATION_ID + ".fileprovider";
File output = null;
private final ActivityResultRegistry mRegistry;
private ActivityResultLauncher<Intent> takePhotoActivityResultLauncher;
private final Context context;
private final Activity activity;
private final FragmentOperationBinding binding;

public IntentHelper(Context context, Activity activity, FragmentOperationBinding binding, ActivityResultRegistry registry) {
    this.mRegistry = registry;
    this.context = context;
    this.activity = activity;
    this.binding = binding;
}

public void handleIntent() {
    setUpLauncher();
    createIntent();
}

private void setUpLauncher() {
    takePhotoActivityResultLauncher = mRegistry.register("key",
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        final int THUMBSIZE = 64;
                        Bitmap ThumbImage = ThumbnailUtils.extractThumbnail(BitmapFactory.decodeFile(output.getAbsolutePath()),
                                THUMBSIZE, THUMBSIZE);
                        binding.photoThumbnail.setImageBitmap(ThumbImage);
                        Intent returnToCallingActivityIntent = new Intent(context, OperationFragment.class);
                        Uri outputUri = FileProvider.getUriForFile(context, AUTHORITY, output);
                        returnToCallingActivityIntent.setDataAndType(outputUri, "image/jpeg");
                        returnToCallingActivityIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    }
                }
            });
}

private void createIntent() {//Create Intent
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(activity.getPackageManager()) != null) {
        // Create the File where the photo should go
        try {
            output = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
            Toast.makeText(context, ex.getMessage(), Toast.LENGTH_LONG).show();
        }
        takePictureIntent.setType("image/jpg");
        Uri photoURI = FileProvider.getUriForFile(context, AUTHORITY, output);
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
        takePictureIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
    }
    binding.photoThumbnail.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                //Launch activity to get result
                takePhotoActivityResultLauncher.launch(takePictureIntent);
        }
    });
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = binding.getOperation().getIdentifier() + "_" + timeStamp;
    File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS + "/operationtimerecord");
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );
    // Save a file: path for use with ACTION_VIEW intents
    String currentPhotoPath = image.getAbsolutePath();
    return image;
}

}`

我从一个片段调用这个自定义 IntentHelper class 的 object 中的 handleIntent 方法，由点击事件触发。 构造函数中传递的 ActivityResultRegistry 参数在该片段中从主活动中检索。

当设备相机未打开时，应用程序会在相应文件夹中创建空文件。 在我使用已弃用的 startActivityForResult 之前，这项工作工作得很好，所以我认为权限、路径和依赖项都很好......

Answer 1

删除setType()调用。 并且，考虑用ActivityResultContracts.TakePicture()替换所有这些。