show message when imageview is not empy without clicking a button

Question

I have a button to select a picture or take a picture from camera, what i want is when the imageview that i use to attached the picture has an image on it., show a message right away, without clicking a button.

What i do now is when you press on a button then it shows some hidden edittext that says "image uploaded" or something. I want to achive this but without clicking any button. I've had tried many other options but all of them use a button.

Any samples or ideas! Thanks in advance

bb.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            validacionImagen();
  }
});

METHOD THAT VALIDATES WHETER THERE'S AN ATTACHED IMAGE:

     public void validacionImagen(){
    if(imageView.getDrawable()==null){
        buttonChoose.setError("Sube una fotografía");
        buttonChoose.setFocusable(true);
        buttonChoose.setFocusableInTouchMode(true);
        buttonChoose.requestFocus();
    }else{
        imagencargada.setVisibility(View.VISIBLE);
        textoimagencargada.setVisibility(View.VISIBLE);
        buttonChoose.setError(null);

    }
}

PICTURE CODE:

private void showFileChooser() {
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Elige una imagen"), PICK_IMAGE_REQUEST);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == CAM_REQUEST){
        Bitmap bitmap = (Bitmap) data.getExtras().get("data");
        filePath = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), filePath);
            imageView.setImageBitmap(bitmap);

        } catch (IOException e) {
            e.printStackTrace();
        }
        //imageView.setImageBitmap(bitmap);
    }else if (requestCode == PICK_IMAGE_REQUEST && resultCode == Activity.RESULT_OK && data != null && data.getData() != null) {
        filePath = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), filePath);
            imageView.setImageBitmap(bitmap);

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

Please show your current code and explain/show code of what exactly have you tried. — Krzysztof Bracha, Jul 03 '17 at 16:24
@KrzysztofBracha it's a button when click on it calls validacionImagen(), to show some TextView, but i want to show it without clicking a button, when the imageview has an image show those TextView right away — Daniel Prado, Jul 03 '17 at 17:19
Once you take a picture or select a picture from the gallery. @DanielRL — Daniel Prado, Jul 04 '17 at 03:58

score 0 · Answer 1 · answered Jul 03 '17 at 15:45

You can try to make something like this:

public class ImageView extends ImageView {

    private OnImageChangeListener onImageChangeListener;

    public ImageView(Context context) {
        super(context);
    }

    public ImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public ImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public void setImageChangeListiner(
            OnImageChangeListener onImageChangeListener) {
        this.onImageChangeListener = onImageChangeListener;
    }

    @Override
    public void setBackgroundResource(int resid) {
        super.setBackgroundResource(resid);
        if (onImageChangeListener != null)
            onImageChangeListener.onImageChanged(this);
    }


    @Override
    public void setBackgroundDrawable(Drawable background) {
        super.setBackgroundDrawable(background);
        if (onImageChangeListener != null)
            onImageChangeListener.onImageChanged(this);
    }


    public interface OnImageChangeListener {
        void onImageChanged(ImageView imageView);
    }

}

Create custom ImageView with a listener to notify when you set the image and override some method that you use to set the image in ImageView to call the listener.

So now using this class, how can i implement it on my activity or what should i replace @Daniel RL — Daniel Prado, Jul 03 '17 at 17:03

score 0 · Accepted Answer · answered Jul 03 '17 at 15:47

If you're calling startActivityForResult in order to get the picture from the camera or gallery like:

startActivityForResult(pictureIntent, SELECT_PICTURE);

Then, you can override onActivityResult to check the results from that intent.

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch(requestCode) {
        case SELECT_PICTURE:
            if(resultCode == RESULT_OK && data != null) {
                //Manage the picture taken here with data
            } else {
                //The intent was cancelled or didn't bring any data
            }
    }
}

Now, if this isn't the approach you're looking for and all you want to do is to check when an ImageView has changed, you can implement a custom ImageView with a listener. Refer to this

show message when imageview is not empy without clicking a button

2 Answers2