Cropping Pictures in Android by keeping Aspect Ratio

问题

I use this code to start the crop activity and i get the cropped picture as data in onActivityResult back. So this works fine.

    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setType("image/*");

    List<ResolveInfo> list = getPackageManager().queryIntentActivities(
            intent, 0);

    int size = list.size();

    if (size == 0) {
        Toast.makeText(this, "Can not find image crop app",
                Toast.LENGTH_SHORT).show();
        return;
    } else {
        intent.setData(mImageCaptureUri);

        intent.putExtra("outputX", 200);
        intent.putExtra("outputY", 200);
        intent.putExtra("scale", true);
        intent.putExtra("return-data", true);

        Intent i = new Intent(intent);
        ResolveInfo res = list.get(0);

        i.setComponent(new ComponentName(res.activityInfo.packageName,
                res.activityInfo.name));

        startActivityForResult(i, CROP_FROM_CAMERA);

This is the code for cropping the image into the size of 200x200, dont matter which aspect ratio I chose at the cropping activity. My concern is, that i want THE aspect ratio which i choose with the rectangle in the activity, not a fixed by putting the numbers 200 and 200.

But when I comment out these two lines, my program will force close....

Are there any solutions for cropping exact to the part of the picture which i chose in the crop activity with keeping the aspect ratio from the rectangle I placed on my picture? Which data do I have to put as extras? Need Help!

回答1:

How to crop a rectangle from an image in android

Cropping to anything other than a square shape is not possible using the built-in Android cropping handling (com.android.camera.action.CROP).

Look at the OP's reply in the next thread - and you might have a solution.

This thread also has some good suggestions:

• How to select and crop an image in android?

回答2:

Just add the following lines of code for aspect ratio 0.75

intent.putExtra("aspectX", 3);
intent.putExtra("aspectY", 4);

and set scale to true.

this should solve the problem.

回答3:

It might be little late to answer, considering that the other people might come to this thread with this same question.

cropIntent.putExtra("aspectX", 1);
cropIntent.putExtra("aspectY", 1);

will make sure that you always get a rectangle.

回答4:

Selecting a image from gallery and cropping keeping Aspect Ratio wanted. In this case the ratio is BANNER_WIDTH_PX:BANNER_HEIGHT_PX.

protected static final int REQ_CODE_PICK_BANNER = 2; //identificador del inten
private static final int BANNER_WIDTH_PX = 640;
private static final int BANNER_HEIGHT_PX =244;

   protected void startSelectorBanner(){
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            photoPickerIntent.setType("image/*");
            photoPickerIntent.putExtra("crop", "true");
             photoPickerIntent.putExtra("aspectX",BANNER_WIDTH_PX);  
             photoPickerIntent.putExtra("aspectY",BANNER_HEIGHT_PX);  
             photoPickerIntent.putExtra("outputX",BANNER_WIDTH_PX);  
             photoPickerIntent.putExtra("outputY",BANNER_HEIGHT_PX);  
            photoPickerIntent.putExtra("return-data", true);
            photoPickerIntent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
            startActivityForResult(photoPickerIntent, REQ_CODE_PICK_BANNER);        
  }


public void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {

            getMainActivity().removeOnActivityResultsListeners(EditQcardFragment.this); 

            switch (requestCode) {
               case REQ_CODE_PICK_BANNER:
                    if (resultCode == Activity.RESULT_OK) {  
                        if (imageReturnedIntent!=null) {
                            Bundle extras = imageReturnedIntent.getExtras();          
                            Bitmap selectedBitmap = extras.getParcelable("data");
                            int[] screenSize = Screen.getSize(getActivity()); 
                            int bannerX = screenSize[0]; 
                            int bannerY = (int) (screenSize[0]/BANNER_RATIO);  

                            Bitmap resizedBitmap = processPicture(selectedBitmap,"banner.png",bannerX,bannerY);
                            mBytesBanner = getPictureBytes("banner.png", resizedBitmap); 
                            log.debug("Get png width: " + mBytesBanner.length);
                            if(mBytesBanner!=null){
                                  mBanner.setImageBitmap(resizedBitmap);
                            }

                        }
                    }break; 
            }       
    }

来源：https://stackoverflow.com/questions/10453446/cropping-pictures-in-android-by-keeping-aspect-ratio