Question

我已经使用imageView和两个按钮创建了一个基本活动。 1按钮打开图库，另一个打开相机。两者都将结果传递给图像裁剪库。裁剪后的图像将保存并显示在imageView中。

第一个我用任何一个按钮做这个，一切顺利。但是，在第二次尝试时，imageView不会被替换，但已保存的图像已更改。

因此，如果imageView已经有了第一个结果，那么它基本上不会更改为新图像。

此处的代码：

public void takeDisplayPicture(View view) {

    final String TAKE_DISPLAY_PICTURE = "Take Display Picture";

    Log.d(TAKE_DISPLAY_PICTURE, "Clicked");

    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {

        File photoFile = null;

        try {

            photoFile = createImageFile();

        } catch (IOException e) {

            Log.e(TAKE_DISPLAY_PICTURE, "Error Occurred");

        }

        if (photoFile != null) {

            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(photoFile));
            Log.d(TAKE_DISPLAY_PICTURE, photoFile.getAbsolutePath());
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);

        }

    } else {

        Log.d(TAKE_DISPLAY_PICTURE, "No Camera");

        Toast.makeText(getApplicationContext(),"No Camera Available",Toast.LENGTH_SHORT).show();

    }

}

protected void onActivityResult(int requestCode, int resultCode, Intent result) {

    final String ON_ACTIVITY_RESULT = "On Activity Result";

    Log.d(ON_ACTIVITY_RESULT, "Triggered");

    Log.d(ON_ACTIVITY_RESULT, "Request Code: "+Integer.toString(requestCode)+" Result Code: "+Integer.toString(resultCode));

    Uri img = Uri.parse("file:///"+Config.APP_PATH+Config.APP_USER_PATH+"/"+Config.DISPLAY_PICTURE_NAME+".png");

    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {

        Log.d(ON_ACTIVITY_RESULT, "Beginning Crop");

        Log.d(ON_ACTIVITY_RESULT,img.toString());

        beginCrop(img, img);

    } else if (requestCode == Crop.REQUEST_CROP) {

        Log.d(ON_ACTIVITY_RESULT, "Handling Crop");

        handleCrop(resultCode, result);

    } else if (requestCode == 2){

        Log.d(ON_ACTIVITY_RESULT, "Gallery Image Returned");

        File file = new File(img.getPath());
        file.delete();

        Uri src = result.getData();

        Log.d(ON_ACTIVITY_RESULT, src.toString());

        beginCrop(src, img);

    }

}

private void beginCrop(Uri source, Uri output){

    final String BEGIN_CROP = "Begin Crop";

    Log.d(BEGIN_CROP, "Beginning");

    new Crop(source).output(output).asSquare().start(this);

}

private void handleCrop(int resultCode, Intent result) {

    final String HANDLE_CROP = "Handle Crop";

    if (resultCode == RESULT_OK) {

        Log.d(HANDLE_CROP, "Set ImageView");
        displayPicture.setImageURI(Crop.getOutput(result));

        try {

            bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Crop.getOutput(result));

        } catch (Exception e ){

            Log.d(HANDLE_CROP, "Error Occurred");

        }

    } else if (resultCode == Crop.RESULT_ERROR) {

        Log.d(HANDLE_CROP, "Error Occurred");

    }
}

String currentPhotoPath;

private File createImageFile() throws IOException {

    final String CREATE_IMAGE_FILE = "Create Image File";

    String fileName = "display_picture";

    File dir = new File(Config.APP_PATH+Config.APP_USER_PATH);

    dir.mkdirs();

    File image = new File(dir,fileName+".png");

    return image;
}

public void chooseFromGallery(View view) {

    final String CHOOSE_FROM_GALLERY = "Choose From Gallery";

    Log.d(CHOOSE_FROM_GALLERY, "Clicked");

    Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
    photoPickerIntent.setType("image/*");
    startActivityForResult(photoPickerIntent, SELECT_PHOTO);
}

Answer 1

如果您阅读setImageURI：

  if (mResource != 0 ||
            (mUri != uri &&
             (uri == null || mUri == null || !uri.equals(mUri)))) {
                  //Set URI...
  }

基本上，只有当图像的Uri不等于您当前要设置的Uri时，setImageURI才有效。您的按钮第二次无效，因为Crop.getOutput(result)每次按下按钮都会返回相同的Uri，因此setImageURI不执行任何操作。

要解决此问题，您可以在displayPicture.setImageURI(null);之前添加displayPicture.setImageURI(Crop.getOutput(result));。

裁剪无效后设置ImageView

1 个答案: