Question

我现在使用本指南一直在努力解决这个问题：

http://frescolib.org/docs/writing-custom-views.html

但它建议编写我自己的onDraw方法，我只想设置TextView的复合drawable。我该怎么做？

Answer 1

您不需要覆盖onDraw，因为TextView已经为您执行了此操作。你可以这样做：

class MyTextView extends TextView {
  MultiDraweeHolder mMultiDraweeHolder;

  // called from constructors
  private void init() {
    mMultiDraweeHolder = new MultiDraweeHolder<GenericDraweeHierarchy>();
    GenericDraweeHierarchyBuilder builder = 
        new GenericDraweeHierarchyBuilder(getResources());
    for (int i = 0; i < 4; i++) {
      GenericDraweeHierarchy hierarchy = builder.reset()
        .set...
        .build();
      mMultiDraweeHolder.add(
          new DraweeHolder<GenericDraweeHierarchy>(hierarchy, getContext()));
  }

实际设置URI和边界：

// build DraweeController as in Fresco docs
DraweeHolder<GenericDraweeHierarchy> holder = mMultiDraweeHolder.get(i);
holder.setController(controller);
holder.getTopLevelDrawable().setBounds(...)

将它们分配给TextView：

List<Drawable> drawables = new ArrayList<>();
for (int i = 0; i < 4; i++) {
  drawables.add(mMultiDraweeHolder.get(i).getTopLevelDrawable());
}
setCompoundDrawables(
    drawables.get(0), drawables.get(1), drawables.get(2), drawables.get(3));

您的TextView仍然需要覆盖onDetachedFromWindow和其他方法，如文档中所述，但您应该可以按原样粘贴该代码。

使用Fresco将TextView设置为可绘制的

1 个答案: