Get touched pixel color of scaled ImageView

To get touched pixel color of a ImageView, you can implement OnTouchListener of the ImageView, get touched position by calling event.getX() and event.getY(), and get the pixel color by calling bitmap.getPixel(x, y)...IF THE BITMAP IN YOUR ImageView IS DISPLAY AT 1:1, layout_width and layout_height ="wrap_content".

If your bitmap is scaled, such as layout_width and layout_height ="match_parent". It will not work! It's a example demonstrate how to invert the touched position to get pixel from scaled ImageView.

package com.example.androidtouchedpixel;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 TextView touchedXY, invertedXY, imgSize, colorRGB;
 ImageView imgSource1, imgSource2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        touchedXY = (TextView)findViewById(R.id.xy);
        invertedXY = (TextView)findViewById(R.id.invertedxy);
        imgSize = (TextView)findViewById(R.id.size);
        colorRGB = (TextView)findViewById(R.id.colorrgb);
     imgSource1 = (ImageView)findViewById(R.id.source1);
     imgSource2 = (ImageView)findViewById(R.id.source2);
     
     imgSource1.setOnTouchListener(imgSourceOnTouchListener);
     imgSource2.setOnTouchListener(imgSourceOnTouchListener);
     
    }
    
    OnTouchListener imgSourceOnTouchListener
    = new OnTouchListener(){

  @Override
  public boolean onTouch(View view, MotionEvent event) {
   
   float eventX = event.getX();
   float eventY = event.getY();
   float[] eventXY = new float[] {eventX, eventY};
   
   Matrix invertMatrix = new Matrix();
   ((ImageView)view).getImageMatrix().invert(invertMatrix);
   
   invertMatrix.mapPoints(eventXY);
   int x = Integer.valueOf((int)eventXY[0]);
   int y = Integer.valueOf((int)eventXY[1]);
   
   touchedXY.setText(
     "touched position: "
     + String.valueOf(eventX) + " / " 
     + String.valueOf(eventY));
   invertedXY.setText(
     "touched position: "
     + String.valueOf(x) + " / " 
     + String.valueOf(y));

   Drawable imgDrawable = ((ImageView)view).getDrawable();
   Bitmap bitmap = ((BitmapDrawable)imgDrawable).getBitmap();
   
   imgSize.setText(
     "drawable size: "
     + String.valueOf(bitmap.getWidth()) + " / " 
     + String.valueOf(bitmap.getHeight()));
   
   //Limit x, y range within bitmap
   if(x < 0){
    x = 0;
   }else if(x > bitmap.getWidth()-1){
    x = bitmap.getWidth()-1;
   }
   
   if(y < 0){
    y = 0;
   }else if(y > bitmap.getHeight()-1){
    y = bitmap.getHeight()-1;
   }

   int touchedRGB = bitmap.getPixel(x, y);
   
   colorRGB.setText("touched color: " + "#" + Integer.toHexString(touchedRGB));
   colorRGB.setTextColor(touchedRGB);
   
   return true;
  }};

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />
    <TextView 
        android:id="@+id/xy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="touched position: "/>
    <TextView 
        android:id="@+id/invertedxy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="inverted touched position: "/>
    <TextView 
        android:id="@+id/size"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="drawable size: "/>
    <TextView 
        android:id="@+id/colorrgb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="touched color: "/>
    <ImageView
        android:id="@+id/source1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher"/>
    <ImageView
        android:id="@+id/source2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/ic_launcher"/>

</LinearLayout>

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