Android实战——Fragment实现底部tab选项卡切换

1.先展示运行效果截图。

2.展示Android项目文件的构成。

3.布局activity_main.xml展示：

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

    <FrameLayout
        android:id="@+id/realtabcontent"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/maintab_toolbar_bg" >

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

</LinearLayout>

4. Fragment1.java代码展示：

package com.example.fragmentdemo2;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		return inflater.inflate(R.layout.fragment1, null);
	}
}

5.MainActivity.java主要代码展示：

public class MainActivity extends FragmentActivity {
	// 定义FragmentTabHost对象
	private FragmentTabHost mTabHost;
	// 定义一个布局
	private LayoutInflater layoutInflater;
	// 定义一个数组来存放Fragment界面
	private Class fragmentArray[] = { Fragment1.class, Fragment2.class,
			Fragment3.class };
	// 定义数组来存放按钮图片
	private int mImageViewArray[] = { R.drawable.tab_finding,
			R.drawable.tab_recording, R.drawable.tab_me };
	// Tab选项卡的文字
	private String mTextViewArray[] = { "发现", "更多", "我的" };

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

	}

private void initView() {
		// 实例化布局对象
		layoutInflater = LayoutInflater.from(this);
		// 实例化TabHost对象，得到TabHost
		mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
		mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
		// 得到fragment的个数
		int count = fragmentArray.length;
		for (int i = 0; i < count; i++) {
			// 为每一个Tab按钮设置图标、文字和内容
			TabSpec tabSpec = mTabHost.newTabSpec(mTextViewArray[i])
					.setIndicator(getTabItemView(i));
			// 将Tab按钮添加进Tab选项卡中
			mTabHost.addTab(tabSpec, fragmentArray[i], null);
			// 设置Tab按钮的背景
			mTabHost.getTabWidget().getChildAt(i)
					.setBackgroundResource(R.drawable.selector_tab_background);
		}
	}

private View getTabItemView(int index) {
		View view = layoutInflater.inflate(R.layout.tab_item_view, null);
		ImageView imageview = (ImageView) view.findViewById(R.id.tabimage);
		imageview.setImageResource(mImageViewArray[index]);
		TextView textview = (TextView) view.findViewById(R.id.textview);
		textview.setText(mTextViewArray[index]);
		return view;
	}

6.附上源码下载地址

项目代码，点击下载