Question

我正在做的应用程序在画布中显示一个图像。它在一台设备上运行良好，但如果我在其他设备上运行相同的应用程序，则图像无法正确显示，因为在onDraw我没有提及 imageview 宽度或高度，所以任何一个你可以建议我如何在onDraw方法中为 imageview 提供宽度和高度。

我的代码是：

@Override
public void onDraw(Canvas canvas) {
    Paint painto = new Paint();
    painto.setAntiAlias(true);
    painto.setColor(getResources().getColor(R.color.magnata));
    painto.setStrokeWidth(3);
    painto.setStyle(Paint.Style.FILL);
    Paint paint = new Paint();
    int leftx2 = (int) (10 * (screenWidth / 1024));
    int topy1 = (int) (10 * (screenHeight / 600));

    Bitmap kangoo = BitmapFactory.decodeResource(getResources(),
            R.drawable.kangoo);
    canvas.drawColor(Color.BLACK);
    canvas.drawBitmap(kangoo, leftx2, topy1, painto);
}

Answer 1

您可以使用onSizeChange（）设置宽度和高度。这可以为您提供不断变化的宽度和高度

protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        // TODO Auto-generated method stub
        super.onSizeChanged(w, h, oldw, oldh);
         newwidth=w;
                 newheight=h;
    }

Answer 2

试试这个

@Override  
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            // TODO Auto-generated method stub
            super.onSizeChanged(w, h, oldw, oldh);
             newwidth=w;
                     newheight=h;
        }
@Override
    public void onDraw(Canvas canvas) {
        Paint painto = new Paint();
        painto.setAntiAlias(true);
        painto.setColor(getResources().getColor(R.color.magnata));
        painto.setStrokeWidth(3);
        painto.setStyle(Paint.Style.FILL);
        Paint paint = new Paint();
        int leftx2 = (int) (10 * (newwidth / 1024));
        int topy1 = (int) (10 * (newheight / 600));

        Bitmap kangoo = BitmapFactory.decodeResource(getResources(),
                R.drawable.kangoo);
        canvas.drawColor(Color.BLACK);
        canvas.drawBitmap(kangoo, leftx2, topy1, painto);
    }

如何使用画布显示所有尺寸的图像

2 个答案: