Android UI进阶之用gallery实现可滑动的Tab

public class MainActivity extends Activity {       private Gallery gallery;       private TabAdapter textAdapter;       private static final String[] TAB_NAMES = {                      "第四个",           "第一个",           "第二个",           "第三个",       };//注意调整顺序               private LinearLayout    mTabLayout_One;       private LinearLayout    mTabLayout_Two;       private LinearLayout    mTabLayout_Three;       private LinearLayout    mTabLayout_Four;       @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);                      gallery = (Gallery) findViewById(R.id.gallery);           textAdapter = new TabAdapter(this, Arrays.asList(TAB_NAMES));           gallery.setAdapter(textAdapter);           gallery.setSelection(34);//这里根据你的Tab数自己算一下，让左边的稍微多一点，不要一滑就滑到头                       mTabLayout_One = (LinearLayout) this.findViewById( R.id.TabLayout_One );           mTabLayout_Two = (LinearLayout) this.findViewById( R.id.TabLayout_Two );           mTabLayout_Three = (LinearLayout) this.findViewById( R.id.TabLayout_Three );           mTabLayout_Four = (LinearLayout) this.findViewById( R.id.TabLayout_Four );                      mTabLayout_One.setVisibility( View.GONE );           mTabLayout_Two.setVisibility( View.VISIBLE );           mTabLayout_Three.setVisibility( View.GONE );           mTabLayout_Four.setVisibility( View.GONE );                      gallery.setOnItemClickListener(new OnItemClickListener() {               @Override               public void onItemClick(AdapterView<?> parent, View view, int position,                       long id) {                   TabAdapter adapter = (TabAdapter)parent.getAdapter();                   adapter.setSelectedTab(position);                   switch(position %TAB_NAMES.length ){                   case 0:                       mTabLayout_One.setVisibility( View.VISIBLE );                       mTabLayout_Two.setVisibility( View.GONE );                       mTabLayout_Three.setVisibility( View.GONE );                       mTabLayout_Four.setVisibility( View.GONE );                       break;                   case 1:                       mTabLayout_One.setVisibility( View.GONE );                       mTabLayout_Two.setVisibility( View.VISIBLE );                       mTabLayout_Three.setVisibility( View.GONE );                       mTabLayout_Four.setVisibility( View.GONE );                       break;                   case 2:                       mTabLayout_One.setVisibility( View.GONE );                       mTabLayout_Two.setVisibility( View.GONE );                       mTabLayout_Three.setVisibility( View.VISIBLE );                       mTabLayout_Four.setVisibility( View.GONE );                       break;                   case 3:                       mTabLayout_One.setVisibility( View.GONE );                       mTabLayout_Two.setVisibility( View.GONE );                       mTabLayout_Three.setVisibility( View.GONE );                       mTabLayout_Four.setVisibility( View.VISIBLE );                   }               }                          });                  }