安卓开发 底部tab的实现

主要代码

public class TabsFrame extends FragmentActivity {

private FragmentTabHost fragmentTabHost;
     private String texts[] = { "首页", "消息", "好友", "广场" };
     private int imageButton[] = { R.drawable.selector1,
             R.drawable.selector2,
             R.drawable.selector3,
             R.drawable.selector4};
     private Class fragmentArray[] = {Page1.class,
             Page2.class,
             Page3.class,
             Page4.class};

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tabsframe);
    
            // 实例化tabhost
            fragmentTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
            fragmentTabHost.setup(this, getSupportFragmentManager(),R.id.maincontent);
    
             for (int i = 0; i < texts.length; i++) {
                TabSpec spec=fragmentTabHost.newTabSpec(texts[i]).setIndicator(getView(i));
                fragmentTabHost.addTab(spec, fragmentArray[i], null);
                 
                //设置背景(必须在addTab之后，由于需要子节点（底部菜单按钮）否则会出现空指针异常)
                fragmentTabHost.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.bgselector);
              }
      }
    private View getView(int i) {
         //取得布局实例
         View view=View.inflate(TabsFrame.this, R.layout.tabcontent, null);
         
         //取得布局对象
         ImageView imageView=(ImageView) view.findViewById(R.id.image);
         TextView textView=(TextView) view.findViewById(R.id.text);
         
         //设置图标
         imageView.setImageResource(imageButton[i]);
         //设置标题
         textView.setText(texts[i]);
         return view;
    }
    public boolean onKeyDown(int KeyCode,KeyEvent Event){

if(KeyCode==KeyEvent.KEYCODE_BACK){
               Intent intent=new Intent(TabsFrame.this,MainActivity.class);
           startActivity(intent);
           finish();
            }
        return true;
    }
 
 }

Layout文件

1. tabsframe

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:orientation="vertical" >
    
         <!-- 存放主要页面内容 -->
    
         <FrameLayout
            android:id="@+id/maincontent"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" >
       </FrameLayout>
        
        <!-- 底层菜单 -->
    
        <android.support.v4.app.FragmentTabHost
            android:id="@android:id/tabhost"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/tab_bg" >
    
            <FrameLayout
               android:id="@android:id/tabcontent"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:layout_weight="0" >
            </FrameLayout>
       </android.support.v4.app.FragmentTabHost>
    </LinearLayout>

2. tabcontent

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="center_horizontal"
      android:orientation="vertical" >
 
      <ImageView
          android:id="@+id/image"
         android:layout_height="wrap_content"
         android:layout_width="wrap_content"
         />
     <TextView
         android:id="@+id/text"
         android:padding="2dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:textColor="@android:color/white"
         />
 </LinearLayout>

这样就可以实现底部菜单栏啦！