使用FragmentActivity+Fragment+FragmentTabHost实现底部标签栏

现在的APP大多用于底部标签栏，在主界面切换显示不同功能模块页面，例如：



在这记录实现底部标签栏的方法，使用FragmentActivity+Fragment且布局中使用FragmentTabHost

1.首先创建布局文件 activity_main.xml

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

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

<android.support.v4.app.FragmentTabHost
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#e0e0e0" />
</LinearLayout>

2.创建标签选项的布局文件 tab_item_view.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:orientation="vertical"
android:paddingTop="6dip"
>

<ImageView
android:id="@+id/iv_Tab"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_gravity="center"
android:layout_margin="4dp"
android:background="@drawable/btn_tab_1"
/>

<TextView
android:id="@+id/tv_Tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="1dp"
android:gravity="center"
android:text="首页"
android:textColor="@color/tab_text"
android:textSize="10sp" />

</LinearLayout>

btn_tab_1.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/tab_press_1" android:state_selected="true" />
<item android:drawable="@drawable/tab_1" />
</selector>

tab_text.xml

<?xml version="1.0" encoding="utf-8"?>

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

<item android:state_selected="true" android:color="#fe9000"/>
<item android:color="#9b9b9b"/>
</selector>

3.创建Activity且继承FragmentActivity

mport android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {
//Tab选项卡的文字
private String tabTextArray[] = {"TAB1", "TAB2", "TAB3", "TAB4"};
//Tab选项卡的图片
private int tabImageArray[] = {R.drawable.btn_tab_1, R.drawable.btn_tab_2, R.drawable.btn_tab_3,
R.drawable.btn_tab_4};
//存放fragment界面
private final Class<?>[] fragments = {Fragment1.class, Fragment2.class, Fragment3.class, Fragment4.class};

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

private void initView() {
FragmentTabHost fragmentTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
fragmentTabHost.setup(this, getSupportFragmentManager(), R.id.real_tab_content);
for (int i = 0; i < fragments.length; i++) {
TabHost.TabSpec tabSpec = fragmentTabHost.newTabSpec("fragment" + i).setIndicator(getTabItemView(i));
fragmentTabHost.addTab(tabSpec, fragments[i], null);
}
}

private View getTabItemView(int i) {
//此处布局是一样的，如果需要显示消息气泡 可根据选项另外设置布局文件
View view = getLayoutInflater().inflate(R.layout.tab_item_view, null);
ImageView imageView = (ImageView) view.findViewById(R.id.iv_Tab);
TextView textView = (TextView) view.findViewById(R.id.tv_Tab);

imageView.setBackgroundResource(tabImageArray[i]);
textView.setText(tabTextArray[i]);
return view;
}

Fragment1

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment1 extends Fragment {
private View rootView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
Log.d("Fragment1", "=====onCreateView======");
if (rootView == null) {
rootView = inflater.inflate(R.layout.fragment_1, null);
}
TextView textView = (TextView) rootView.findViewById(R.id.tv);
textView.setText("Fragment1");
return rootView;
}
}