22 
View v = rootView.findViewById(R.id.layout1);
if (v != null) {
    v.buildDrawingCache();
    Bitmap bitmap = v.getDrawingCache();
    canvas.drawBitmap(bitmap, dummyMatrix, null);
    v.destroyDrawingCache();   
}

我有这个代码。但我需要截取我所有的 ListView 项目，但如果我的 listview 的项目比屏幕上可见的项目多，则当项目大于可见矩形时，此代码不会捕获。

如何正确捕获我的 ListView？

我创建的新工作代码

public static Bitmap getWholeListViewItemsToBitmap() {

    ListView listview    = MyActivity.mFocusedListView;
    ListAdapter adapter  = listview.getAdapter(); 
    int itemscount       = adapter.getCount();
    int allitemsheight   = 0;
    List<Bitmap> bmps    = new ArrayList<Bitmap>();

    for (int i = 0; i < itemscount; i++) {

        View childView      = adapter.getView(i, null, listview);
        childView.measure(MeasureSpec.makeMeasureSpec(listview.getWidth(), MeasureSpec.EXACTLY), 
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
        childView.setDrawingCacheEnabled(true);
        childView.buildDrawingCache();
        bmps.add(childView.getDrawingCache());
        allitemsheight+=childView.getMeasuredHeight();
    }

    Bitmap bigbitmap    = Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight, Bitmap.Config.ARGB_8888);
    Canvas bigcanvas    = new Canvas(bigbitmap);

    Paint paint = new Paint();
    int iHeight = 0;

    for (int i = 0; i < bmps.size(); i++) {
        Bitmap bmp = bmps.get(i);
        bigcanvas.drawBitmap(bmp, 0, iHeight, paint);
        iHeight+=bmp.getHeight();

        bmp.recycle();
        bmp=null;
    }


    return bigbitmap;
}
4

4 回答 4

46

工作代码：

public static Bitmap getWholeListViewItemsToBitmap() {

    ListView listview    = MyActivity.mFocusedListView;
    ListAdapter adapter  = listview.getAdapter(); 
    int itemscount       = adapter.getCount();
    int allitemsheight   = 0;
    List<Bitmap> bmps    = new ArrayList<Bitmap>();

    for (int i = 0; i < itemscount; i++) {

        View childView      = adapter.getView(i, null, listview);
        childView.measure(MeasureSpec.makeMeasureSpec(listview.getWidth(), MeasureSpec.EXACTLY), 
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
        childView.setDrawingCacheEnabled(true);
        childView.buildDrawingCache();
        bmps.add(childView.getDrawingCache());
        allitemsheight+=childView.getMeasuredHeight();
    }

    Bitmap bigbitmap    = Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight, Bitmap.Config.ARGB_8888);
    Canvas bigcanvas    = new Canvas(bigbitmap);

    Paint paint = new Paint();
    int iHeight = 0;

    for (int i = 0; i < bmps.size(); i++) {
        Bitmap bmp = bmps.get(i);
        bigcanvas.drawBitmap(bmp, 0, iHeight, paint);
        iHeight+=bmp.getHeight();

        bmp.recycle();
        bmp=null;
    }


    return bigbitmap;
}
于 2012-10-18T14:23:16.027 回答
6

虽然不可能对尚未渲染的内容（如 ListView 的屏幕外项目）进行屏幕截图，但您可以制作多个屏幕截图，在每个镜头之间滚动内容，然后加入图像。这是一个可以为您自动执行此操作的工具：https ://github.com/PGSSoft/scrollscreenshot

插图

免责声明：我是这个工具的作者，它是由我的雇主出版的。欢迎提出功能要求。

于 2014-10-14T06:20:18.710 回答
0

使用此函数获取列表视图的位图

public Bitmap getBitmapFromView(View view) {

Bitmap returnedBitmap = Bitmap.createBitmap(view.getMeasuredWidth(),
              view.getMeasuredHeight() , 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;
}

用这个作为

Bitmap b = getBitmapFromView(your listview object here);

并根据需要使用此位图

希望帮助..

于 2012-10-05T10:20:13.607 回答
0

如果您生成的位图具有黑色背景。这是因为您查看无法从 xml 文件中获取颜色。所以设置视图的颜色 

View v = adapter.getView(i, null, listview);
            v.measure(View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),
                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
            v.setDrawingCacheEnabled(true);
            v.buildDrawingCache(true);
            v.setBackgroundColor(Color.parseColor("#F08080"));
            bmps.add(v.getDrawingCache(true));
            allitemsheight += v.getMeasuredHeight();
于 2017-09-09T10:40:38.413 回答