Android - ImageView 内的 Canvas drawLine

Question

我有一个 ImageView，我想在其中画一条线。我已经完成了以下操作:

mImagenCampo = (ImageView) findViewById(R.id.imagen_campo); 

crearPunto(mArea9M, mPaloIzq,v.getWidth(), mPaloIzq,Color.WHITE);


函数是:

private void crearPunto(float x, float y, float xend, float yend, int color) {

    BitmapDrawable bmpDraw = (BitmapDrawable) mImagenCampo.getDrawable();
    Bitmap bmp = bmpDraw.getBitmap().copy(Config.RGB_565, true);
    Canvas c = new Canvas(bmp);
    Paint p = new Paint();
    p.setColor(color);
    c.drawLine(x, y, xend, yend, p);
    mImagenCampo.setImageBitmap(bmp);

}

我的问题是线条已绘制但未获得正确的坐标。它绘制得比应有的要小。

谢谢

编辑:我忘了说 mImagenCampo 是一个 ImageView

Answer 1

试试这个:

private void crearPunto(float x, float y, float xend, float yend, int color) {

    bmp = Bitmap.createBitmap(mImagenCampo.getWidth(), mImagenCampo.getHeight(), Config.ARGB_8888);
    c = new Canvas(bmp);
        mImagenCampo.draw(c);

    Paint p = new Paint();
    p.setColor(color);
    c.drawLine(x, y, xend, yend, p);
    mImagenCampo.setImageBitmap(bmp);
}