0
我只是想畫一個SurfaceView,並從here繪圖畫布SurfaceView
修改了一些示例代碼,如果我在它的工作循環直接繪製,但是當我調用Draw方法這是行不通的。任何想法可能是什麼問題? 但是,這是我在其他教程中看到的,所以它應該工作。 當然我可以使用draw1。但我想知道爲什麼onDraw在這裏不起作用?
public class TestSurefaceView extends Activity {
MySurfaceView mySurfaceView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mySurfaceView = new MySurfaceView(this);
setContentView(mySurfaceView);
}
class MySurfaceView extends SurfaceView implements Runnable{
Thread thread = null;
SurfaceHolder surfaceHolder;
volatile boolean running = false;
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
Random random;
public MySurfaceView(Context context) {
super(context);
surfaceHolder = getHolder();
random = new Random();
}
@Override
public void run() {
while(running){
if(surfaceHolder.getSurface().isValid()){
Canvas canvas = surfaceHolder.lockCanvas();
//draw(canvas); // does not work
draw1(canvas); // works
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
private void draw1(Canvas canvas){
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
int w = canvas.getWidth();int h = canvas.getHeight();
int x = random.nextInt(w-1);
int y = random.nextInt(h-1);
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
paint.setColor(0xff000000 + (r << 16) + (g << 8) + b);
canvas.drawPoint(x, y, paint);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
draw1(canvas);
}
}
}
你錯過了你的'setWillNotDraw(false);'調用某處...... – EpicPandaForce