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• 如何使印有线索与点相联并提取点?
原标题:How to make an Android app that prints touched points and draw them?

我想作一小.。 你将触及屏幕并提取一些东西,并将列出你通过的要点,并为第5点各选取小块绿色3x3 rec。 我在TouchEvent上用文字表达来列出各点,并将之发送至常设意见。 然而,我有问题。 我检查了绘画(绘画)的例子,但我无法为印刷点和绘画绿灯工作。 任何帮助都是巨大的。

最佳回答

这里,请查阅<代码>的快速样本。 地表

public class FunPanel extends SurfaceView {

    class Point {
        int X;
        int Y;

        public Point() {
            X = Y = -1;
        }

    }

    private ArrayList<Point> mPoints = new ArrayList<Point>();
    private Point mCurPoint = new Point();
    private Bitmap mBitmap = ....// your desired image


    @Override
    public void doDraw(Canvas canvas) {
        if( !(mPoints.size() % 5) ) {
            canvas.drawBitmap(mBitmap, mCurPoint.X, mCurPoint.Y, null);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mCurPoint.X = (int) event.getX() - mBitmap.getWidth() / 2;
        mCurPoint.Y = (int) event.getY() - mBitmap.getHeight() / 2;

        mPoints.add(mCurPoint);
        return super.onTouchEvent(event);
    }

}
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