将视图转换为位图 [英] convert view into bitmap

问题描述

可能的重复:
将视图转换为位图而不在 Android 中显示?

我正在尝试从以下参考链接将视图转换为位图

I am trying to convert the view into bitmap from following reference link

链接文本

现在的问题是如何获得仅从视图转换的位图.在示例中，作者使用了 relativelayout.dispatchDraw(c) 但这一行给了我编译时错误，即

Now the problem is how can i get the bitmap that is being converted from view only. in the example author has used relativelayout.dispatchDraw(c) but this line is giving me compile time error i.e.

dispatchDraw(Canvas)方法来自类型 ViewGroup 不可见

The method dispatchDraw(Canvas) from the type ViewGroup is not visible

这是我的代码，我在 onCreate 函数中编写了以下代码

Here is my code and i have written the following code inside onCreate function

    Canvas c=null;

    //Create Layout
    RelativeLayout relativeView ;           
    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
    RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT
    );

    relativeView = new RelativeLayout(this);            
    relativeView.setLayoutParams(lp);

    //Background of Layout
    Bitmap viewBgrnd  = BitmapFactory.decodeResource(getResources(),R.drawable.bgblack);
    relativeView.setBackgroundDrawable(new BitmapDrawable(viewBgrnd));

    //associated with canvas 
    Bitmap returnedBitmap =               Bitmap.createBitmap(320,480,Bitmap.Config.ARGB_8888);     
    c = new Canvas(returnedBitmap);
    Paint paint = new Paint();


    //Create Imageview that holds image             
    ImageView newImage = new ImageView(this);
    Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.bgpink);
    newImage.setImageBitmap(srcBitmap);

    TextView newText = new  TextView(this);

    newText.setText("This is the text that its going to appear");       

    c.drawBitmap(viewBgrnd, 0, 0, paint);
            relativeView.layout(100, 0, 256, 256);  
    relativeView.addView(newImage);
    relativeView.addView(newText);


        // here i am getting compile time error so for timing i have replaced this line
        // with relativeView.draw(c);

    relativeView.dispatchDraw(c);

这里返回的Bitmap应该包含(ImageView和TextView)的图像，但这个位图只包含relativeView的bacground位图，即bgblack

Here the returnedBitmap should contain the image of (ImageView and TextView) but this bitmap contains only bacground bitmap of relativeView i.e. bgblack

推荐答案

这是我的解决方案:

public static Bitmap getBitmapFromView(View view) {
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(returnedBitmap);
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null) 
        bgDrawable.draw(canvas);
    else 
        canvas.drawColor(Color.WHITE);
    view.draw(canvas);
    return returnedBitmap;
}

享受:)

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