viewpager+fragment仿微信底部TAG完美渐变，在图片渐变的同时字的颜色也在变，注意，是渐变哦！

效果图：

activity_main.xml

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

    <android.support.v4.view.ViewPager
        android:id="@+id/id_viewpager"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:background="@drawable/tabbg"
        android:orientation="horizontal" >

        <com.Sing.weixin.ChangeColorIconWithTextView
            android:id="@+id/id_indicator_one"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:padding="5dp"
            zhy:icon="@drawable/ic_menu_start_conversation"
            zhy:text="@string/tab_one"
            zhy:text_size="12sp" />

        <com.Sing.weixin.ChangeColorIconWithTextView
            android:id="@+id/id_indicator_two"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:padding="5dp"
            zhy:icon="@drawable/ic_menu_friendslist"
            zhy:text="@string/tab_two"
            zhy:text_size="12sp" />
    </LinearLayout>

</LinearLayout>

MainActivity.java

package com.Sing.weixin;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewConfiguration;

@SuppressLint("NewApi")
public class MainActivity extends FragmentActivity implements
		OnPageChangeListener, OnClickListener {
	private ViewPager mViewPager;
	// 选项卡一Fragment
	private FrgReturnVisit returnVisit;

	// 选项卡一Fragment
	private FrgMicroVisit microVisit;

	private List<ChangeColorIconWithTextView> mTabIndicator = new ArrayList<ChangeColorIconWithTextView>();

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

		setOverflowShowingAlways();
		mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
		mViewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
		initTabIndicator();

		mViewPager.setOnPageChangeListener(this);
 	}

	pr