MyThread.java
package com.example.androidsurfaceview;
import android.graphics.Canvas;
public class MyThread extends Thread {
MySurfaceView myView;
private boolean running = false;
public MyThread(MySurfaceView view) {
myView = view;
}
public void setRunning(boolean run) {
running = run;
}
@Override
public void run() {
while(running){
Canvas canvas = myView.getHolder().lockCanvas();
if(canvas != null){
synchronized (myView.getHolder()) {
myView.drawSomething(canvas);
}
myView.getHolder().unlockCanvasAndPost(canvas);
}
try {
sleep(30);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
Modify MySurfaceView.java in last post.
package com.example.androidsurfaceview;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MySurfaceView extends SurfaceView {
private SurfaceHolder surfaceHolder;
private Bitmap bmpIcon;
private MyThread myThread;
int xPos = 0;
int yPos = 0;
int deltaX = 5;
int deltaY = 5;
int iconWidth;
int iconHeight;
public MySurfaceView(Context context) {
super(context);
init();
}
public MySurfaceView(Context context,
AttributeSet attrs) {
super(context, attrs);
init();
}
public MySurfaceView(Context context,
AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init(){
myThread = new MyThread(this);
surfaceHolder = getHolder();
bmpIcon = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
iconWidth = bmpIcon.getWidth();
iconHeight = bmpIcon.getHeight();
surfaceHolder.addCallback(new SurfaceHolder.Callback(){
@Override
public void surfaceCreated(SurfaceHolder holder) {
myThread.setRunning(true);
myThread.start();
}
@Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
myThread.setRunning(false);
while (retry) {
try {
myThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}});
}
protected void drawSomething(Canvas canvas) {
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(bmpIcon,
getWidth()/2, getHeight()/2, null);
xPos += deltaX;
if(deltaX > 0){
if(xPos >= getWidth() - iconWidth){
deltaX *= -1;
}
}else{
if(xPos <= 0){
deltaX *= -1;
}
}
yPos += deltaY;
if(deltaY > 0){
if(yPos >= getHeight() - iconHeight){
deltaY *= -1;
}
}else{
if(yPos <= 0){
deltaY *= -1;
}
}
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(bmpIcon,
xPos, yPos, null);
}
}
Other files, /res/layout/activity_main.xml and MainActivity.java, refer to last post.
Download the files.
Next:
- Draw bitmap programmatically for SurfaceView