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package com.example.surfaceviewexample;
import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class SurfaceViewActivity extends Activity implements Runnable {
private Button swapBtn;
private SurfaceView surface;
private SurfaceHolder holder;
private boolean locker=true;
private Thread thread;
private int radiusBlack, radiusWhite;
private boolean left = true;
//physics
private static final int baseRadius = 10;
private static final int maxRadius = 50;
private static final int baseSpeed = 1;
private int speed = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_surface_view);
swapBtn = (Button) findViewById(R.id.buttonswap);
surface = (SurfaceView) findViewById(R.id.mysurface);
holder = surface.getHolder();
thread = new Thread(this);
thread.start();
swapBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
/** SWAP ANIMATION LEFT OR RIGHT CIRCLE*/
left = !left;
}
});
}
@Override
public void run() {
// TODO Auto-generated method stub
while(locker){
//checks if the lockCanvas() method will be success,and if not, will check this statement again
if(!holder.getSurface().isValid()){
continue;
}
/** Start editing pixels in this surface.*/
Canvas canvas = holder.lockCanvas();
//ALL PAINT-JOB MAKE IN draw(canvas); method.
draw(canvas);
// End of painting to canvas. system will paint with this canvas,to the surface.
holder.unlockCanvasAndPost(canvas);
}
}
/**This method deals with paint-works. Also will paint something in background*/
private void draw(Canvas canvas) {
// paint a background color
canvas.drawColor(android.R.color.holo_blue_bright);
// paint a rectangular shape that fill the surface.
int border = 20;
RectF r = new RectF(border, border, canvas.getWidth()-20, canvas.getHeight()-20);
Paint paint = new Paint();
paint.setARGB(200, 135, 135, 135); //paint color GRAY+SEMY TRANSPARENT
canvas.drawRect(r , paint );
/*
* i want to paint to circles, black and white. one of circles will
* bounce, tile the button 'swap' pressed and then other circle begin bouncing.
*/
calculateRadiuses();
//paint left circle(black)
paint.setColor(getResources().getColor(android.R.color.black));
canvas.drawCircle(canvas.getWidth()/4, canvas.getHeight()/2, radiusBlack, paint);
//paint right circle(white)
paint.setColor(getResources().getColor(android.R.color.white));
canvas.drawCircle(canvas.getWidth()/4*3, canvas.getHeight()/2, radiusWhite, paint);
}
private void calculateRadiuses() {
// TODO Auto-generated method stub
if(left){
updateSpeed(radiusBlack);
radiusBlack += speed;
radiusWhite = baseRadius;
}
else{
updateSpeed(radiusWhite);
radiusWhite += speed;
radiusBlack = baseRadius;
}
}
/**Change speed according to current radius size.
* if, radius is bigger than maxRad the speed became negative otherwise
* if radius is smaller then baseRad speed will positive.
* @param radius
*/
private void updateSpeed(int radius) {
// TODO Auto-generated method stub
if(radius>=maxRadius){
speed = -baseSpeed;
}
else if (radius<=baseRadius){
speed = baseSpeed;
}
}
@Override
protected void onPause() {
super.onPause();
pause();
}
private void pause() {
//CLOSE LOCKER FOR run();
locker = false;
while(true){
try {
//WAIT UNTIL THREAD DIE, THEN EXIT WHILE LOOP AND RELEASE a thread
thread.join();
} catch (InterruptedException e) {e.printStackTrace();
}
break;
}
thread = null;
}
@Override
protected void onResume() {
super.onResume();
resume();
}
private void resume() {
//RESTART THREAD AND OPEN LOCKER FOR run();
locker = true;
}
} |
Lié une Surfaceview à son layout
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