如何将视图转换为位图？

Answer 1

如何将View转换为Bitmap

FrameLayout view = (FrameLayout)findViewById(R.id.framelayout);

view.setDrawingCacheEnabled(true);

view.buildDrawingCache();

Bitmap bm = view.getDrawingCache();

Answer 2

我曾经使用

buildDrawingCache()

方法来获取布局的位图，但是 当视图很大时，我遇到了麻烦。现在我使用以下方法：

FrameLayout view = findViewById(R.id.framelayout);
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);

Answer 3

您好，您可以使用以下代码片段获取视图的位图

mView.setDrawingCacheEnabled(true);
mView.getDrawingCache();

Answer 4

为什么你不编写扩展 ImageView 的类并重写 onDraw 方法并将图像和文本放在那里，这样更容易

Answer 5

首先需要添加依赖

implementation 'com.github.vipulasri.layouttoimage:library:1.0.0'

然后将布局转换为位图

RelativeLayout pdfmain;
Layout_to_Image layout_to_image;
Bitmap mBitmap;



    layout_to_image = new Layout_to_Image(AllotmentDoc.this, pdfmain);
    mBitmap = layout_to_image.convert_layout();

Answer 6

    FrameLayout v = (FrameLayout)findViewById(R.id.frme1);

    v.setDrawingCacheEnabled(true);

    // this is the important code :)
  // Without it the view will have a dimension of 0,0 and the bitmap will be null
    v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
            View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
    v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());

    v.buildDrawingCache(true);

    v.post(new Runnable() {
        @Override
        public void run() {
           // Bitmap b = v.getDrawingCache();
            Bitmap b = Bitmap.createBitmap(v.getDrawingCache());
            v.setDrawingCacheEnabled(false); // clear drawing cache
            Log.e("ss","ss"+b.getHeight());
        }
    });

这里我添加了一个后置可运行线程，确保 createBitmap 方法仅在 v.buildDrawingCache(true); 之后执行。 v.buildDrawingCache(true);在某些手机上需要几毫秒的时间，这就是它在某些手机上崩溃的原因。如果您遇到 Bitmap 对象的空指针异常，请尝试此解决方案。

Answer 7

公共静态位图loadBitmapFromView（视图视图）{ view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

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

    return bitmap;
}