Question

我用一个按钮来打开相机并拍摄一个用作背景的图片, 并用另一个按钮来添加位于顶部并可移动的项目。直到我试图将表面视图保存为Bitmap时, 我得到的只是背景, 没有图像在顶部。

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    if(_mGotImage){

        canvas.drawBitmap(_mImage, 0, 0, null);
    }else{

            canvas.drawColor(Color.BLACK);
    }

    //if the array is not empty
    if(!_mJazzItems.isEmpty()){

        //step through each item in the array
        for(JazzItem item: _mJazzItems){

            //get the bitmap it is using
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), item.getBitmap());
            //and draw that bitmap at its X and Y coords
            canvas.drawBitmap(bitmap, item.getX(), item.getY(), null);

        }
    }
}

这是试图保存Canvas 的方法。

    public void screenGrab(){

    Bitmap image = Bitmap.createBitmap(_mPanelWidth, _mPanelHeight, Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(image);
    this.onDraw(canvas);

    String path=Environment.getExternalStorageDirectory() + "/test2.png";
    File file = new File(path);

    try{

        file.createNewFile();
        FileOutputStream ostream = new FileOutputStream(file);
        image.compress(CompressFormat.PNG, 100, ostream);
        ostream.flush();
        ostream.close();

    }catch (Exception e){

        e.printStackTrace();
    }
}

在线拖拉机很好,我被拍到后台,可以将我所有的项目加到顶部,并移动到周围。当我尝试用屏幕拍摄时,顶部的项目都不存在。

谢谢你的帮助!

-- -- 更新 -- --

我将屏幕抓取方法修改为:

    public void screenGrab(){

    Bitmap image = Bitmap.createBitmap(_mPanelWidth, _mPanelHeight, Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(image);

    canvas.drawBitmap(_mImage, 0, 0, null);

    //if the array is not empty
    if(!_mJazzItems.isEmpty()){

        //step through each item in the array
        for(JazzItem item: _mJazzItems){

            //get the bitmap it is using
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), item.getBitmap());
            //and draw that bitmap at its X and Y coords
            canvas.drawBitmap(bitmap, item.getX(), item.getY(), null);

        }
    }

    String path=Environment.getExternalStorageDirectory() + "/test2.png";
    File file = new File(path);

    try{

        file.createNewFile();
        FileOutputStream ostream = new FileOutputStream(file);
        image.compress(CompressFormat.PNG, 100, ostream);
        ostream.flush();
        ostream.close();

    }catch (Exception e){

        e.printStackTrace();
    }
}

我看不出来为什么这不把其他图像画在顶部...

Answer 1

以我的情况来说,我用的是这个:

public static Bitmap combineImages(Bitmap c, Bitmap overLayImage, Context con) {
    Bitmap cs = null;
    int width, height = 0;
    width     = c.getWidth();
    height     = c.getHeight();
    cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas comboImage = new Canvas(cs);
    comboImage.drawBitmap(c, 0, 0, null);
    String left = yourleftPosition;
    String top = yourtopPosition;

    comboImage.drawBitmap(overLayImage, Float.parseFloat(left), Float.parseFloat(top),null);
    /******
    *
    * Write file to SDCard
    *
    * ****/
    String tmpImg = String.valueOf(System.currentTimeMillis()) + ".png";
    OutputStream os = null;
    try {
        String pathis = Environment.getExternalStorageDirectory()
        + "/DCIM/Camera/" + tmpImg;
        os = new FileOutputStream(pathis);
        cs.compress(CompressFormat.PNG, 100, os);
    }
    catch (IOException e) {
        Log.e("combineImages", "problem combining images", e);
    }
    return cs;
}

友情链接