一.layout

1.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation
 
="vertical">

    <FrameLayout
        android:id="@+id/main_fragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"></FrameLayout>

    <android.support.v4.app.FragmentTabHost
        android:id="@+id/tab_host"
        android:layout_width
 
="match_parent"
        android:layout_height="60dp">

        <FrameLayout
            android:id="@+id/content_fra"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0"></FrameLayout>
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

2.first_gragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <TextView
        android:id="@+id/first_tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="bottom|center"
        android:textColor="#000000"
        android:textSize="17sp"
        android:text="first"/>

</LinearLayout>

3.second_fragment.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <TextView
        android:id="@+id/second_tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="bottom|center"
        android:textColor="#000000"
        android:textSize="17sp" />

</LinearLayout>

4.third_fragment.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <TextView
        android:id="@+id/third_tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="bottom|center"
        android:textColor="#000000"
        android:textSize="17sp" />

</LinearLayout>

5.item_bar.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_item_tabbar"
        style="@style/TabButton" />

</LinearLayout>

二.values

1.styles.xml添加

 <style name="TabButton">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">match_parent</item>
        <item name="android:padding">5dp</item>
        <item name="android:layout_gravity">center</item>
        <item name="android:gravity">center</item>
        <item name="android:background">@drawable/tab_bg_selector</item>
        <item name="android:textSize">12sp</item>
        <item name="android:textStyle">normal</item>
        <item name="android:textColor">@drawable/tab_text_selector</item>
    </style>

2.colors.xml添加

 <color name="black">#000000</color>
    <color name="white">#ffffff</color>
    <color name="grey">#888888</color>
    <color name="red">#ff0000</color>
    <color name="orange_light">#ffffdd</color>
    <color name="transparent">#00000000</color>
    <color name="blue">#0099ff</color>
    <color name="green">#00ff99</color>

    <color name="orange">#F9CC12</color>
    <color name="blue_light">#aaaaff</color>
    <color name="tab_text_selected">#0084e8</color>
    <color name="tab_text_normal">#7597b3</color>

三.drawable

1.tab_text_selector.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:color="@color/tab_text_selected" />
    <item android:color="@color/tab_text_normal" />
</selector>

2.tab_bg_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/tab_bg_selected" android:state_selected="true" />
    <item android:drawable="@drawable/tab_bg_normal" />
</selector>

四.drawable-hdpi

五.java

1.新建Fragment_Dir包

2.FirstFragment.java

public class FirstFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.first_gragment, container, false);
        return view;
    }
}

3.SecondFragment.java

public class SecondFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.second_fragment, container, false);
        return view;
    }
}

4.ThirdFragment.java

public class ThirdFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.second_fragment, container, false);
        return view;
    }
}

5.MainActivity.java

 private FragmentTabHost Frag_TabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Frag_TabHost = (FragmentTabHost) findViewById(R.id.tab_host);
        Frag_TabHost.setup(this, getSupportFragmentManager(), R.id.main_fragment);

        Frag_TabHost.addTab(GetTabView("first", R.drawable.tab_first_pressed), FirstFragment
                .class, null);
        Frag_TabHost.addTab(GetTabView("second", R.drawable.tab_second_normal), SecondFragment
                .class, null);
        Frag_TabHost.addTab(GetTabView("third", R.drawable.tab_third_normal), ThirdFragment
                .class, null);

    }

    private TabHost.TabSpec GetTabView(String text, int img_id) {

        Drawable drawable = getResources().getDrawable(img_id);

        drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());

        View item_bar = getLayoutInflater().inflate(R.layout.item_bar, null);
        TextView tv_item = (TextView) item_bar.findViewById(R.id.tv_item_tabbar);
        tv_item.setText(text);
        tv_item.setCompoundDrawables(null, drawable, null, null);
        TabHost.TabSpec spec = Frag_TabHost.newTabSpec(text).setIndicator(item_bar);
        return spec;

    }

六.效果

andorid實現類似微信的底部菜單