将Android视图作为位图获取以将其保存在SD上

我试图保存在View上绘制的路径，但我无法弄清楚如何做到这一点。

以下是我在活动中创建视图并将其设置为内容的内容：

View accPathView = new AccPathView(this, steps);
setContentView(accPathView);

然后在我的View类的onDraw方法中，我只是创建一个路径并在作为参数收到的画布上绘制它：

但是，当我尝试使用getDrawingCache（）获取视图的位图时，它始终为空，并在SD上创建一个空图像。 我试过了

accPathView.setDrawingCacheEnabled(true);
accPathView.buildDrawingCache(true);

不幸的是，它没有改变任何东西，我仍然得到一个空的位图。

---

你可以试试这个：

public static Bitmap getBitmapFromView(View view) {
    //Define a bitmap with the same size as the view
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
    //Bind a canvas to it
    Canvas canvas = new Canvas(returnedBitmap);
    //Get the view's background
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null)
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    else
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return returnedBitmap;
}

编辑：

上述方法如何？

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    View accPathView = new AccPathView(this, steps);
    setContentView(accPathView);

    accPathView.post(new Runnable() {
         public void run() {
             Bitmap viewBitmap = getBitmapFromView(accPathView);
         }
    });

    // your remaining oncreate

}

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