将Android视图获取为位图以将其保存在SD上 [英] Get Android view as Bitmap to save it on SD

问题描述

我正在尝试保存在View上绘制的路径，但我只是不知道该怎么做.

I'm trying to save the path that is being drawn on a View but I just can't figure out how to do this.

这是我在活动"中创建视图并将其设置为内容的操作:

Here is what I'm doing in my Activity to create the View and set it as content:

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

然后在View类的onDraw方法中，我只是创建一个路径并将其绘制在作为参数接收的画布上

Then in the onDraw method of my View class, I'm simply creating a path and drawing it on the canvas I received as parameter:

但是，当我尝试使用getDrawingCache()获取视图的位图时，该位图始终为null，并在SD上创建了一个空图像.我尝试过

But then, when I try to get the bitmap of my view with getDrawingCache(), it's always null and creates an empty image on my SD. I tried

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

不幸的是，它什么都没有改变，我仍然得到一个空的位图.

Unfortunately it didn't change anything and I still get an empty bitmap.

推荐答案

您可以尝试以下方法:

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;
}

您如何使用上述方法?

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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