android - ImageView setImageBitmap 在某些设备上不工作

Question

我正在练习使用 Camera API，为此我执行了以下操作:

一个。为捕获的图像设置一个目录(用于startActivityForResult)

设置位图，以便图像一旦保存在应用程序本身中就可以显示。

下面是代码:

设置目录。

private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            IMAGE_DIRECTORY_NAME);
    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
                    + IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }
    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
    } else {
        return null;
    }

    return mediaFile;
}

应用程序中的全局变量

// Activity request codes
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
public static final int MEDIA_TYPE_IMAGE = 1;

// directory name to store the captured images
private static final String IMAGE_DIRECTORY_NAME = "my_camera_app";

private Uri fileUri;

// Views
ImageView photo;
Button camera;

相机实现逻辑

// Use camera function
private void captureImage() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

    // start the image capture Intent
    startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            // Successfully captured the image
            // display in imageview
            previewImage();
        } else {
            // failed to capture image
            Toast.makeText(getApplicationContext(),
                    "Sorry! Failed to capture image", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}

private void previewImage() {
    try {
        // Bitmap factory
        BitmapFactory.Options options = new BitmapFactory.Options();

        // Downsizing image as it throws OutOfMemory exception for larger
        // images
        options.inSampleSize = 3;

        final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
                options);

        photo.setImageBitmap(bitmap);

    } catch (NullPointerException e) {
        e.printStackTrace();
    }
}

我遇到的问题是......对于我测试该应用程序的某些设备，该应用程序显示拍摄图像的空白预览，而在其他设备上该应用程序运行良好。

为什么我收到空白反馈？在某些情况下，当保存图像时，用户不会被定向到我的应用程序，而是停留在相机应用程序中。

请帮忙。

Answer 1

我遇到了同样的问题，通过将 View 渲染更改为软件解决了

ImageView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);