android异步生成图片的示例代码

private Bitmap createBitmap(View view) {
    int widthSpec = View.MeasureSpec.makeMeasureSpec(view.getLayoutParams().width, View.MeasureSpec.EXACTLY);
    int heightSpec = View.MeasureSpec.makeMeasureSpec(view.getLayoutParams().height, View.MeasureSpec.EXACTLY);
    view.measure(widthSpec, heightSpec);
    int measureWidth = view.getMeasuredWidth();
    int measureHeight = view.getMeasuredHeight();
    view.layout(0, 0, measureWidth, measureHeight);
    int width = view.getWidth();
    int height = view.getHeight();
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);
    return bitmap;
  }

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="200dp"
  android:layout_height="200dp"
  android:background="#ECAA0A">

  <ImageView
    android:layout_width="160dp"
    android:layout_height="94dp"
    android:layout_gravity="center_horizontal"
    android:src="@mipmap/pic_bg" />

  <ImageView
    android:id="@+id/invitation_share_link_pic_avatar_iv"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:layout_gravity="center_horizontal|bottom"
    android:layout_marginBottom="10dp"
    android:src="@mipmap/ic_launcher" />
</FrameLayout>

private void generate() {
    SharePicModel sharePicModel = new SharePicModel((ViewGroup) getWindow().getDecorView());
    sharePicModel.setAvatarResId(R.mipmap.ic_launcher);
    GeneratePictureManager.getInstance().generate(sharePicModel, (throwable, bitmap) -> {
      if (throwable != null || bitmap == null) {
        Toast.makeText(this, getString(R.string.generate_pic_error), Toast.LENGTH_SHORT).show();
      } else {
        Toast.makeText(this, getString(R.string.generate_pic_success), Toast.LENGTH_SHORT).show();
        mResultIv.setImageBitmap(bitmap);
      }
    });
  }