【IMOOC学习笔记】多种多样的App主界面Tab实现方法(四)

 ViewPagerIndicator+ViewPager

要想使用ViewPagerIndicator,要使用到viewPagerlibrary开源库

top.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="wrap_content"
    android:background="#58ACED"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/idx_logo" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="imooc"
        android:textColor="#ffffff"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:textStyle="bold" />

</LinearLayout>

每个tab页面,很简单，只有一个textView：

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

    <TextView
        android:id="@+id/id_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textStyle="bold"
        android:textSize="22sp"
        android:text="helloworld" />

</RelativeLayout>

activity_main.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#C5DAED"
    android:orientation="vertical" >

    <include layout="@layout/top" />

    <com.viewpagerindicator.TabPageIndicator
        android:id="@+id/id_indicator"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent" >
    </com.viewpagerindicator.TabPageIndicator>

    <android.support.v4.view.ViewPager
        android:id="@+id/id_viewpager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </android.support.v4.view.ViewPager>

</LinearLayout>

MainActivity.java

package com.imooc.tab04;

import java.util.List;

import android.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Window;

import com.viewpagerindicator.TabPageIndicator;

public class MainActivity extends FragmentActivity
{
    private ViewPager mViewPager;
    private TabPageIndicator mTabPageIndicator;
    private TabAdapter mAdapter ;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        
        initView();
    }
    private void initView()
    {
        mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
        mTabPageIndicator = (TabPageIndicator) findViewById(R.id.id_indicator);
        mAdapter = new TabAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(mAdapter);
        
        mTabPageIndicator.setViewPager(mViewPager, 0);
    }   
}

TabAdapter

package com.imooc.tab04;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

public class TabAdapter extends FragmentPagerAdapter
{

    public static String[] TITLES = new String[]
    { "课程", "问答", "求课", "学习", "计划" };

    public TabAdapter(FragmentManager fm)
    {
        super(fm);
    }

    @Override
    public Fragment getItem(int arg0)
    {
        TabFragment fragment = new TabFragment(arg0);
        return fragment;
    }

    @Override
    public int getCount()
    {
        return TITLES.length;
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        return TITLES[position];
    }

}

TabFragment

package com.imooc.tab04;

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

@SuppressLint("ValidFragment")
public class TabFragment extends Fragment
{
    private int pos;

    @SuppressLint("ValidFragment")
    public TabFragment(int pos)
    {
        this.pos = pos;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.frag, container, false);
        TextView tv = (TextView) view.findViewById(R.id.id_tv);
        tv.setText(TabAdapter.TITLES[pos]);
        return view;
    }
}