開發(fā)過程中有個地方使用了ViewStub，但是發(fā)現(xiàn)ViewStub調(diào)用setTranslationX之后并沒有任何反應(yīng)，經(jīng)過一番實驗，發(fā)現(xiàn)使用inflate獲取了View之后，再對View使用setTranslationX才會有效果

public class ViewStubTestActivity extends Activity {

 ViewStub sb1;
 ViewStub sb2;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main_viewstub);
  sb1 = (ViewStub) findViewById(R.id.stub_1);
  sb2 = (ViewStub) findViewById(R.id.stub_2);
  // sb1.setVisibility(View.VISIBLE); // 或者使用sb1.inflate()
  // sb1.setTranslationX(100); // 然后這個并沒有效果
  sb1.inflate().setTranslationX(100); // 這個才有效
 }
}

簡單讀了一下源碼，發(fā)現(xiàn)ViewStub在實例化具體內(nèi)容的時候，把自己給移除了，同時將具體內(nèi)容作為一個引用存了下來。而不是自身轉(zhuǎn)換為目標(biāo)，也不是自己將目標(biāo)作為自身的子view。

所以我們應(yīng)該去用這個mInflatedViewRef所指代的View
而不是用ViewStub本身。

貼一段源碼。

  /**
     * Inflates the layout resource identified by {@link #getLayoutResource()}
     * and replaces this StubbedView in its parent by the inflated layout resource.
     *
     * @return The inflated layout resource.
     *
     */
    public View inflate() {
        final ViewParent viewParent = getParent();

        if (viewParent != null && viewParent instanceof ViewGroup) {
            if (mLayoutResource != 0) {
                final ViewGroup parent = (ViewGroup) viewParent;
                final LayoutInflater factory;
                if (mInflater != null) {
                    factory = mInflater;
                } else {
                    factory = LayoutInflater.from(mContext);
                }
                final View view = factory.inflate(mLayoutResource, parent,
                        false);

                if (mInflatedId != NO_ID) {
                    view.setId(mInflatedId);
                }

                final int index = parent.indexOfChild(this);
                parent.removeViewInLayout(this);

                final ViewGroup.LayoutParams layoutParams = getLayoutParams();
                if (layoutParams != null) {
                    parent.addView(view, index, layoutParams);
                } else {
                    parent.addView(view, index);
                }

                mInflatedViewRef = new WeakReference<View>(view);

                if (mInflateListener != null) {
                    mInflateListener.onInflate(this, view);
                }

                return view;
            } else {
                throw new IllegalArgumentException("ViewStub must have a valid layoutResource");
            }
        } else {
            throw new IllegalStateException("ViewStub must have a non-null ViewGroup viewParent");
        }
}

以上。