026 Java Android Program to Demonstrate Motion Event on Android screen with the help of an Image
Posted by Superadmin on December 21 2015 05:39:43

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This Android Java Program lets you create an Activity to Capture Motion Event on Android screen.
Here is source code of the Program to create an Activity to Capture Motion Event on Android screen. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Main Activity

package com.example.motion_event;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;

public class MainActivity extends Activity implements OnTouchListener {
Ourview v;
Bitmap bm;
float x, y;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
v = new Ourview(this);
v.setOnTouchListener(this);
bm = BitmapFactory.decodeResource(getResources(), R.drawable.image4);
x = 0;
y = 0;
setContentView(v);
}

@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
v.pause();
}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
v.resume();
}

// surface view is going to be a thread now
class Ourview extends SurfaceView implements Runnable {

Thread th = null;
SurfaceHolder holder;
boolean var = false;

public Ourview(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = getHolder();
}

@Override
public void run() {
// TODO Auto-generated method stub
while (var = true) {
// do stuff
if (!holder.getSurface().isValid()) {
continue;
}
Canvas c = holder.lockCanvas();
/*
* while drawing on a canvas we lock it and after drawing on it
* we unlock it
*/

c.drawARGB(255, 250, 150, 20);// rgb values
c.drawBitmap(bm, x - (bm.getWidth() / 2), y
- (bm.getHeight() / 2), null);
holder.unlockCanvasAndPost(c);
}
}

public void pause() {

var = false;
while (true) {
try {
th.join();
/*
* would pause the currently executing thread till the user
* finishes its job
*/
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
th = null;
}

public void resume() {
var = true;
th = new Thread(this);
th.start();
}
}

@Override
public boolean onTouch(View v, MotionEvent me) {
// TODO Auto-generated method stub

try {
Thread.sleep(80);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
switch (me.getAction()) {
case MotionEvent.ACTION_DOWN:
x = me.getX();
y = me.getY();
break;

case MotionEvent.ACTION_UP:
x = me.getX();
y = me.getY();
break;

case MotionEvent.ACTION_MOVE:
x = me.getX();
y = me.getY();
break;

default:
break;
}

return true;
}

}