passsy's Blog

I wrote an Activity which enables multitouch support. There you can touch two Views on the Activity at once.

Only the MOVE event doesn’t work very well. UP and DOWN works perfect.
Download Zip: here

package de.passsy.test;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class MultitouchtestActivity extends MultiTouchActivity {
    /** Called when the activity is first created. */

    private Button btn1;
    private Button btn2;
    private Button btn3;
    private Button btn4;

    @Override
    public void onCreate(Bundle savedInstanceState) {
	this.requestWindowFeature(Window.FEATURE_NO_TITLE);
	this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
	this.getWindow().clearFlags(
		WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
	btn1 = (Button) findViewById(R.id.button1);
	btn1.setOnTouchListener(this);
	btn2 = (Button) findViewById(R.id.button2);
	btn2.setOnTouchListener(this);
	btn3 = (Button) findViewById(R.id.button3);
	btn3.setOnTouchListener(this);
	btn4 = (Button) findViewById(R.id.button4);
	btn4.setOnTouchListener(this);
    }
}

package de.passsy.test;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.FrameLayout;

public class MultiTouchActivity extends Activity implements OnTouchListener {

    private View parent;

    public void onCreate(Bundle instance) {
	super.onCreate(instance);
	parent = findViewById(android.R.id.content).getRootView();
	parent.setOnTouchListener(this);
    }

    public boolean onTouch(View v, MotionEvent event) {

	for (int ptrIndex = 0; ptrIndex < event.getPointerCount(); ptrIndex++) {

	    // index of the pointer which starts this Event
	    int actionPointerIndex = event.getActionIndex();

	    // resolve the action as a basic type (up, down or move)
	    int actionResolved = event.getAction() & MotionEvent.ACTION_MASK;
	    if (actionResolved < 7 && actionResolved > 4) {
		actionResolved = actionResolved - 5;
	    }

	    if (actionResolved == MotionEvent.ACTION_MOVE) {

		dealEvent(ptrIndex, event, v, actionResolved);
		Log.v("tag", "move" + ptrIndex);

	    } else {
		dealEvent(actionPointerIndex, event, v, actionResolved);
	    }
	}
	return false;
    }

    private void dealEvent(int actionPointerIndex, MotionEvent event,
	    View eventView, int actionresolved) {
	int rawX, rawY;
	int location[] = { 0, 0 };
	eventView.getLocationOnScreen(location);
	// Log.v("tag", location + "");
	rawX = (int) event.getX(actionPointerIndex) + location[0];
	rawY = (int) event.getY(actionPointerIndex) + location[1];

	ArrayList views = getTouchedViews(rawX, rawY, actionresolved);

	// dumpEvent(event);
	for (View view : views) {
	    int x, y;
	    view.getLocationOnScreen(location);
	    x = rawX - location[0];
	    y = rawY - location[1];
	    // Log.v("tag", "touched" + view.toString());
	    /*
	     * view.onTouchEvent(MotionEvent.obtain(event.getDownTime(),
	     * event.getEventTime(), event.getActionMasked(), x, y,
	     * event.getMetaState()));
	     */
	    // MotionEvent me = MotionEvent.obtain(event);
	    MotionEvent me = MotionEvent.obtain(event.getDownTime(),
		    event.getEventTime(), actionresolved, x, y,
		    event.getPressure(actionPointerIndex),
		    event.getPressure(actionPointerIndex),
		    event.getMetaState(), event.getXPrecision(),
		    event.getYPrecision(), event.getDeviceId(),
		    event.getEdgeFlags());
	    me.setLocation(x, y);

	    // Log.v("tag", "oldeventid: " + event.getAction() + " #" +
	    // actionPointerIndex+ " id" + ptrId+ " resolved "+ actionResolved);
	    // Log.v("tag", "neweventid: " + me.getAction() + " #" +
	    // actionPointerIndex+ " id" + ptrId+ " resolved "+ actionResolved);

	    if (!me.equals(event)) {
		/*
		 * Log.v("tag", "actionindex: " + actionPointerIndex +
		 * " resolved: " + actionPointerIndex + " to " + view.toString()
		 * + " y:" + view.getTop() + "-" + (view.getTop() +
		 * view.getHeight()));
		 */
		// me.setAction(actionresolved);
		view.onTouchEvent(me);
	    }

	    if (actionresolved == MotionEvent.ACTION_MOVE) {
		Log.v("tag",
			"#" + actionPointerIndex + "Rawx:" + rawX + " rawy:"
				+ rawY + "x:" + x + " y:" + y + " "
				+ view.toString());
	    }
	}

    }

    private ArrayList getTouchedViews(int x, int y, int action) {

	int moveGap = 0;

	if (action == MotionEvent.ACTION_MOVE) {
	    moveGap = 0;
	}

	ArrayList touchedViews = new ArrayList();
	ArrayList possibleViews = new ArrayList();

	if (parent instanceof ViewGroup) {
	    possibleViews.add(parent);
	    for (int i = 0; i < possibleViews.size(); i++) { 		View view = possibleViews.get(i); 		int location[] = { 0, 0 }; 		view.getLocationOnScreen(location); 		if (((view.getHeight() + location[1] + moveGap >= y)
			& (view.getWidth() + location[0] + moveGap >= x)
			& (view.getLeft() - moveGap  getChildViews(View view) {
	ArrayList views = new ArrayList();
	if (view instanceof ViewGroup) {
	    ViewGroup v = ((ViewGroup) view);
	    if (v.getChildCount() > 0) {
		for (int i = 0; i < v.getChildCount(); i++) {
		    views.add(v.getChildAt(i));
		}

	    }
	}
	return views;
    }
}

Download Zip: here

Tags: Android, android-activity-button-call, android-arraylist-button, android-button-arraylist, android-button-setontouchlistenerthis, android-buttons-multitouch, android-getactionmasked-action_move, android-multitouch-viewgroup, android-pass-motion-event-to-parent, android-using-viewgroup-for-multitouch, android-view-enable-multitouch, buttons, multitouch, multitouch-button-android, this-getwindow-import, view-getlocationonscreenint, viewgroup-multitouch, viewgroupfindviewbyidandroid-r-id-content-getchildat0, views, where-to-download-android-view-motionevent