How to detect single touch as well as multi-touch in onTouchEvent()

Question

I used the following code to detect the single finger touch and double finger touch. The code detects the double finger touch (when count==2).

I need t

Answer 1

You checked that ACTION_DOWN but at the same time you also need to check ACTION_POINTER_DOWN, which makes sense more clear. try it

 @Override
    public boolean onTouchEvent(MotionEvent event) {    
         scaleGestureDetector.onTouchEvent(event);

         int action = event.getAction();

         if( (action == MotionEvent.ACTION_DOWN) && (action != MotionEvent.ACTION_POINTER_DOWN))
             // Single touch
        else if ( action == MotionEvent.ACTION_POINTER_DOWN)
            //multi touch

        return true;
}   

Edited

boolean multiTouch=false;
 @Override
public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub

    int index= event.getActionIndex();
    int action = event.getAction();

    if( index ==1)
    {
        multiTouch=true;
        System.out.println("mutli");
    }
    else if (multiTouch==false)
        System.out.println("single");
    //else if (action== MotionEvent.ACTION_POINTER_1_UP)
    //  multiTouch=false;
    else if (action== MotionEvent.ACTION_MOVE && multiTouch)
        System.out.println("mutli");
    else if (action== MotionEvent.ACTION_MOVE && !multiTouch)
        System.out.println("single");

        return super.onTouchEvent(event);
}

EDITED:

 package com.pinch.detect;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class PinchDetectorActivity extends Activity {
    TextView textGestureAction;
    ImageView img1, img2;
    static Bitmap bm, bm1;

boolean multiTouch = false;
Context context;
float scaleFactor = 0.0f;
float lastscale;
int scr_width, scr_height;
Display display;
private ScaleGestureDetector scaleGestureDetector;

/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    textGestureAction = (TextView) findViewById(R.id.GestureAction);
    img1 = (ImageView) findViewById(R.id.img_left);
    img2 = (ImageView) findViewById(R.id.img_right);
    display = getWindowManager().getDefaultDisplay();

    scr_width = display.getWidth();
    scr_height = display.getHeight();
    Log.v("width >>", Integer.toString(scr_width));
    Log.v("height >>", Integer.toString(scr_height));

    bm = BitmapFactory.decodeResource(this.getResources(),
            R.drawable.fiction1);
    img1.setImageBitmap(bm);
    bm1 = BitmapFactory.decodeResource(this.getResources(),
            R.drawable.fiction2);
    img2.setImageBitmap(bm1);
    img1.setScaleType(ImageView.ScaleType.FIT_START);
    img2.setScaleType(ImageView.ScaleType.FIT_END);

    scaleGestureDetector = new ScaleGestureDetector(this,
            new MySimpleOnScaleGestureListener());



    img1.setOnTouchListener(new OnTouchListener(){

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            system.out.println("Image 1 touched");
            return false;
        }

    });



img2.setOnTouchListener(new OnTouchListener(){

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            system.out.println("Image 2 touched");
            return false;
        }

    });
}

@Override
public boolean onTouchEvent(MotionEvent event) {

    scaleGestureDetector.onTouchEvent(event);
    int index = event.getActionIndex();
    Log.v("Index value ",index+"");
    int action = event.getAction();

    if (index == 1) {
        multiTouch = true;
        System.out.println("mutli1");
    } else if (multiTouch == false) {
        System.out.println("single1");
        img1.onTouch(view, event);

    }

     else if (action == MotionEvent.ACTION_MOVE && multiTouch) {
        System.out.println("mutli2");
         img2.onTouch(view, event);

        if (scaleFactor > 1) {

            Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
                    scr_width / 2, scr_height, true);
            img1.setImageBitmap(resizedbitmap);
            Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
                    scr_width / 2, scr_height, true);
            img2.setImageBitmap(resizedbitmap1);
            Log.v("width >>", Integer.toString(scr_width));
            Log.v("height >>", Integer.toString(scr_height));

        } else if(scaleFactor<1){

            Log.v("width >>", Integer.toString(scr_width));
            Log.v("height >>", Integer.toString(scr_height));
            if (scr_width >= 640) {
                Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
                        scr_height + 90, scr_height, true);

                img1.setImageBitmap(resizedbitmap);

                Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
                        scr_height + 90, scr_height, true);

                img2.setImageBitmap(resizedbitmap1);
            } else {
                Bitmap resizedbitmap = Bitmap.createScaledBitmap(bm,
                        scr_height, scr_height + 30, true);

                img1.setImageBitmap(resizedbitmap);

                Bitmap resizedbitmap1 = Bitmap.createScaledBitmap(bm1,
                        scr_height, scr_height + 30, true);

                img2.setImageBitmap(resizedbitmap1);
            }

        }



    } else if (action == MotionEvent.ACTION_MOVE && !multiTouch)
    {
        System.out.println("single2");
    }

    return super.onTouchEvent(event);

}

public class MySimpleOnScaleGestureListener extends
        SimpleOnScaleGestureListener {

    @Override
    public boolean onScale(ScaleGestureDetector detector) {
        // TODO Auto-generated method stub

        scaleFactor = detector.getScaleFactor();

        Log.v("scaleFactor >>>", scaleFactor + "");

        return true;
    }
}

}

Latest:

if (index == 1) {
        multiTouch = true;
        img2.onTouch(view, event);
    System.out.println("mutli1");
} else if (multiTouch == false) {
    System.out.println("single1");
    img1.onTouch(view, event);

}

 else if (action == MotionEvent.ACTION_MOVE && multiTouch) {
    System.out.println("mutli2");