[英]android how to draw Bitmap in random x y every 3 second in touch event
public class MyGameView extends View implements OnTouchListener{
static int x, y;
final static int radius = 25;
private int androidX;
private int androidY;
Paint paint;
Bitmap android;
boolean touch = false;
Handler handler = new Handler();
private Runnable r = new Runnable() {
@Override
public void run() {
invalidate();
}
};
private Runnable r2 = new Runnable() {
@Override
public void run() {
androidX = (int) Math.ceil(Math.random() * (MyGameView.this.getWidth()-android.getWidth()));
androidY = (int) Math.ceil(Math.random() * (MyGameView.this.getHeight()-android.getHeight()));
}
};
public MyGameView(Context context) {
super(context);
paint = new Paint();
paint.setAntiAlias(true); // smooth rendering
android = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
setFocusable(true);
setOnTouchListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
if(touch == true){
paint.setARGB(255, 222, 78, 112);
canvas.drawBitmap(android, androidX, androidY, null);
canvas.drawCircle(x,y,radius,paint);
}
handler.postDelayed(r, 1000);
handler.postDelayed(r2, 3000);
super.onDraw(canvas);
}
@Override
public boolean onTouch(View view, MotionEvent event) {
x=(int)event.getX()-(radius/2);
y=(int)event.getY()-(radius/2);
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
touch = true;
break;
case MotionEvent.ACTION_UP:
touch = false;
break;
}
invalidate();
return true;
}
}
这里我的代码我想要的是当我握住手指时,位图在随机位置x y开始每3秒开始绘制一次。 一切正常,但问题图像像疯了一样画到每个位置,我无法想象如何做到这一点我尝试在ACTION_DOWN上调用invalidate()但现在我的圆圈每3秒画一次我触摸的位置。 任何帮助都很感激。
我不相信我完全理解你想要的东西,但代码的问题如下: onDraw
经常被调用。 在每个调用中,运行r2
的延迟为3秒。 实际上, r2
和onDraw
一样频繁运行,但是第一次延迟了3秒。
我认为你想要做的是在一个单独的线程中运行r2
并每3秒不断更新一次位置,如:
public class MyGameView extends View implements OnTouchListener{
static int x, y;
final static int radius = 25;
private int androidX;
private int androidY;
Paint paint;
Bitmap android;
boolean touch = false;
private Runnable r2 = new Runnable() {
@Override
public void run() {
androidX = (int) Math.ceil(Math.random() * (MyGameView.this.getWidth()-android.getWidth()));
androidY = (int) Math.ceil(Math.random() * (MyGameView.this.getHeight()-android.getHeight()));
}
};
public MyGameView(Context context) {
super(context);
paint = new Paint();
paint.setAntiAlias(true); // smooth rendering
android = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
setFocusable(true);
setOnTouchListener(this);
new Thread(r2).start(); // run r2 in a separate thread
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(touch == true){
paint.setARGB(255, 222, 78, 112);
canvas.drawBitmap(android, androidX, androidY, null);
canvas.drawCircle(x,y,radius,paint);
}
}
@Override
public boolean onTouch(View view, MotionEvent event) {
x=(int)event.getX()-(radius/2);
y=(int)event.getY()-(radius/2);
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
touch = true;
break;
case MotionEvent.ACTION_UP:
touch = false;
break;
}
return true;
}
}
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