package com.hsx.tab;

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.view.View;

import android.widget.ImageButton;

public class MainActivity extends FragmentActivity {

    protected static final String TAG = "MainActivity";

    private View currentButton;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initComponents();

    }

    private void initComponents() {

        ImageButton btn_one = (ImageButton) findViewById(R.id.buttom_one);

        ImageButton btn_two = (ImageButton) findViewById(R.id.buttom_two);

        ImageButton btn_three = (ImageButton) findViewById(R.id.buttom_three);

        btn_one.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                FragmentManager fm = getSupportFragmentManager();

                FragmentTransaction ft = fm.beginTransaction();

                Fragment_One fragment_one = new Fragment_One();

                ft.replace(R.id.fl_content, fragment_one, MainActivity.TAG);

                ft.commit();

                setButton(v);

            }

        });

        btn_two.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                FragmentManager fm = getSupportFragmentManager();

                FragmentTransaction ft = fm.beginTransaction();

                Fragment_Two fragment_two = new Fragment_Two();

                ft.replace(R.id.fl_content, fragment_two, MainActivity.TAG);

                ft.commit();

                setButton(v);

            }

        });

        btn_three.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                FragmentManager fm = getSupportFragmentManager();

                FragmentTransaction ft = fm.beginTransaction();

                Fragment_Three fragment_three = new Fragment_Three();

                ft.replace(R.id.fl_content, fragment_three, MainActivity.TAG);

                ft.commit();

                setButton(v);

            }

        });

        /**

         * 默认第一个按钮点击

         */

        btn_one.performClick();

    }

    /**

     * 设置按钮的背景图片

     *

     * @param v

     */

    private void setButton(View v) {

        if (currentButton != null && currentButton.getId() != v.getId()) {

            currentButton.setEnabled(true);

        }

        v.setEnabled(false);

        currentButton = v;

    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <LinearLayout

        android:id="@+id/buttom_bar_group"

        android:layout_width="match_parent"

        android:layout_height="60dp"

        android:layout_alignParentBottom="true"

        android:gravity="center_vertical"

        android:orientation="horizontal">

        <RelativeLayout style="@style/ButtomBar">

            <ImageButton

                android:id="@+id/buttom_one"

                style="@style/ButtomBarImgBtn"

                android:background="@drawable/bar_news"

                android:contentDescription="@string/app_name" />

        </RelativeLayout>

        <RelativeLayout style="@style/ButtomBar">

            <ImageButton

                android:id="@+id/buttom_two"

                style="@style/ButtomBarImgBtn"

                android:background="@drawable/bar_constact"

                android:contentDescription="@string/app_name" />

        </RelativeLayout>

        <RelativeLayout style="@style/ButtomBar">

            <ImageButton

                android:id="@+id/buttom_three"

                style="@style/ButtomBarImgBtn"

                android:background="@drawable/bar_deynaimic"

                android:contentDescription="@string/app_name" />

        </RelativeLayout>

    </LinearLayout>

    <View

        android:id="@+id/line"

        android:layout_width="match_parent"

        android:layout_height="0.5dp"

        android:layout_above="@id/buttom_bar_group"

        android:background="@color/devide_line" />

    <FrameLayout

        android:id="@+id/fl_content"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_above="@id/line" />

</RelativeLayout>