Android realizes Taobao product list switching effect

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:andro
xmlns:tools="/tools"
android:
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="3dp"
tools:context=".a3_.MainActivity">

<Button
 android:
 android:text="Switch layout"
 android:textSize="20dp"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" />
<ListView
 android:
 android:layout_width="match_parent"
 android:layout_height="match_parent">
</ListView>

<GridView
 android:
 android:numColumns="2"
 android:visibility="gone"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
</GridView>
</FrameLayout>

package .a3_;

import .;
import ;
import ;
import ;
import ;
import ;
import ;
import ;

public class MainActivity extends AppCompatActivity {

private ListView lv;
private GridView gv;
private Button button;
//Set default display or hideprivate boolean isLvShow = true;
private boolean isGvShow = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
 (savedInstanceState);
 setContentView(.activity_main);

 //Initialize the control lv = (ListView) findViewById();
 gv = (GridView) findViewById();
 button = (Button) findViewById();

 //Set the adapter (new MyAdapter());
 (new MyAdapter());

 //Set click event for the button (new () {
  @Override
  public void onClick(View v) {
   if (isLvShow){
    ();
    ();
   }else {
    ();
    ();
   }

   //Inverse the display or hide   isLvShow = !isLvShow;
   isGvShow = !isGvShow;
  }
 });
}

class MyAdapter extends BaseAdapter{

 @Override
 public int getCount() {
  return 20;
 }

 @Override
 public Object getItem(int position) {
  return null;
 }

 @Override
 public long getItemId(int position) {
  return 0;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {

  // Set layout for listview  if (convertView==null){
   convertView = (getApplicationContext(),,null);
  }
  return convertView;
 }
}
}