android 将以编程方式创建的视图绘制为位图

whhtz7ly 于 2023-01-03 发布在 Android

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我正在尝试使用绘图缓存来制作一个以编程方式创建的视图的位图，如下所示：

LinearLayout view = new LinearLayout(context);
view.setBackground(context.getResources().getColor(R.color.green));
view.setDrawingCacheEnabled(true);

int width = View.MeasureSpec.makeMeasureSpec(800, View.MeasureSpec.EXACTLY);
int height = View.MeasureSpec.makeMeasureSpec(600, View.MeasureSpec.EXACTLY); 
view.measure(w, h);
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.buildDrawingCache(true);

Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());

我期望它输出一个800 x600的绿色位图;相反，我得到了一个800 x600的白色位图。我做错了什么？

android

来源：https://stackoverflow.com/questions/41558400/draw-a-programatically-created-view-to-a-bitmap

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按热度按时间

w80xi6nr1#

多亏了@CommonsWare，这才行得通：

LinearLayout view = new LinearLayout(context);
    view.setBackgroundColor(context.getResources().getColor(R.color.green));
    int width = View.MeasureSpec.makeMeasureSpec(800, View.MeasureSpec.EXACTLY);
    int height = View.MeasureSpec.makeMeasureSpec(600, View.MeasureSpec.EXACTLY); 
    view.measure(width, height);

    Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
    view.draw(canvas);

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android 将以编程方式创建的视图绘制为位图

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