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>