修复android4.0以下bug,zorder 为空问题

Author: evilbinary

lib/src/main/java/org/evilbinary/tv/widget/TvZorderRelativeLayout.java

@@ -1,6 +1,7 @@
 package org.evilbinary.tv.widget;
 
 import android.content.Context;
+import android.os.Build;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.View;
@@ -30,20 +31,25 @@ public void setCurrentPosition(int pos) {
 
  @Override
  public boolean dispatchKeyEvent(KeyEvent event) {
-
- View focused=findFocus();
- int pos = indexOfChild(focused);
- if (pos >= 0 && pos < getChildCount() ) {
- setCurrentPosition(pos);
- postInvalidate();
+ if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+ View focused = findFocus();
+ int pos = indexOfChild(focused);
+ if (pos >= 0 && pos < getChildCount()) {
+ setCurrentPosition(pos);
+ postInvalidate();
+ }
  }
 
  return super.dispatchKeyEvent(event);
  }
 
  @Override
  protected int getChildDrawingOrder(int childCount, int i) {
-
+ View v = getFocusedChild();
+ int pos = indexOfChild(v);
+ if (pos >= 0 && pos < childCount)
+ setCurrentPosition(pos);
+ 
  if (i == childCount - 1) {//这是最后一个需要刷新的item
  return position;
  }