在 Android Studio 中将画布转换为位图

Question

我在SurfaceView 中有一个画布，我可以在其中进行绘制。现在，按下一个按钮，我想要画布并制作一个位图，它将显示在底部。那么，我必须为制作位图编写什么代码？

 public class Square extends Activity implements Runnable {

private SurfaceView surface;
private SurfaceHolder holder;
private boolean locker = true;
private Thread thread;

int tmp1 = 0, tmp2 = 0;

Background sfondo;

Canvas canvas;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    surface = (SurfaceView) findViewById(R.id.mysurface);
    surface.setFocusable(true);
    holder = surface.getHolder();

    sfondo = new Background((BitmapFactory.decodeResource(getResources(), R.drawable.sfondo)));


    thread = new Thread(this);
    thread.start();
}

@Override
public void run() {
    while (locker) {
        if (!holder.getSurface().isValid()) {
            continue;
        }
        canvas = new Canvas();
        canvas = holder.lockCanvas();
        draw(canvas);
        holder.unlockCanvasAndPost(canvas);
    }
}

private void draw(Canvas canvas) {
   sfondo.draw(canvas);

    tmp1 = (int)Math.random();
    tmp2 = (int)Math.random();

    canvas.drawCircle(tmp1, tmp2, 5, Color.BLACK);
}
}
}

Answer 1

对于 Lollo，请使用 {} 这是可读的代码

@Override public void run() { 
    while(locker){
     if(!holder.getSurface().isValid()){ 
    continue; 
    } 
    AA = Bitmap.createBitmap(surface.getWidth(), surface.getHeight(), Bitmap.Config.ARGB_8888); 
    canvas = new Canvas(AA); 
    canvas = holder.lockCanvas(); 
    draw(canvas); 
    holder.unlockCanvasAndPost(canvas);
     }
  } 
    private void draw(Canvas canvas) {
    tmp1, tmp2 = (int)Math.random(...);
     canvas.drawCircle(tmp1, tmp2, gra, black);
     }

Answer 2

private Bitmap generateBitmap(){
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    surface.draw(canvas);
    return bitmap;
}

然后就可以使用位图了。

另一种解决方案就是

Bitmap bitmap = surface.getDrawingCache()