Using SurfaceView

1) Create layout with surface view

eg:  activity_surface_test.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"

   android:paddingLeft="@dimen/activity_horizontal_margin"

   android:paddingRight="@dimen/activity_horizontal_margin"

   android:paddingTop="@dimen/activity_vertical_margin"

   tools:context=".SurfaceTest" >

   <TextView

       android:id="@+id/surfacetitle"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:gravity="center_horizontal"

       android:text="Surface Test" />

   

   <SurfaceView

       android:id="@+id/drawingsurface"

       android:layout_below="@+id/surfacetitle"

       android:layout_width="fill_parent"

       android:layout_height="fill_parent"

       />

</RelativeLayout>

2) Create Activity for using surfaceview

eg: SurfaceTest.java

package com.test.surface;

import com.test.R;

import android.os.Bundle;

import android.app.Activity;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.util.Log;

import android.view.Menu;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

public class SurfaceTest extends Activity implements SurfaceHolder.Callback, Runnable

{

public static final int DIFF = 10;

int cx, cy;

int radius = 10;

Paint cpaint, bgpaint;

int h, w;

int xdiff =DIFF;

int ydiff = DIFF;

SurfaceView sView;

SurfaceHolder holder;

Rect surfaceRect;

boolean isExit;

Thread thisThread;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_surface_test);

sView = (SurfaceView) findViewById(R.id.drawingsurface);

holder = sView.getHolder();

holder.addCallback(this);

thisThread = new Thread(this);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.surface_test, menu);

return true;

}

@Override

public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

// TODO Auto-generated method stub

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

Log.d("surfaceCreated", " on surfaceCreated holder "+ holder);

isExit = false;

//start the thread only if surface created

thisThread.start();

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

Log.d("surfaceDestroyed", " on surfaceDestroyed holder "+ holder);

isExit = true;

}

@Override

public void run()

{

Canvas canvas = null;

while(!isExit)

{

try

{

Thread.sleep(100);

// Get the canvas for drawing on surface

canvas = holder.lockCanvas();

// random moving circle eg

if(canvas != null)

{

if(w == 0)

{

h = canvas.getHeight();

w = canvas.getWidth();

cx = w/2;

cy = h/2;

surfaceRect = new Rect(0,0,w,h);

cpaint = new Paint();

cpaint.setColor(Color.RED);

bgpaint = new Paint();

bgpaint.setColor(Color.BLACK);

}

canvas.drawRect(surfaceRect, bgpaint);

canvas.drawCircle(cx, cy, radius, cpaint);

}

if((cx - radius) <= 0)

{

xdiff = DIFF;

}

else if((cx + radius) >= w)

{

xdiff = -DIFF;

}

if((cy - radius) <= 0)

{

ydiff = DIFF;

}

else if((cy + radius) >= h)

{

ydiff = -DIFF;

}

cx += xdiff;

cy += ydiff;

}

catch(Exception e)

{

Log.d("run method", e.toString());

}

finally

{

if(canvas != null)

{

// publish the drawing

holder.unlockCanvasAndPost(canvas);

}

}

}

}

}