转载请标明出处：http://blog.csdn.net/lmj623565791/article/details/25708045
一哥们去*前给了我个任务，就是整这东西，哥们回来了，赶紧做了个，哈哈，可惜没给我带切糕。
新版微信的效果，一眼看上去准备用ViewpagerIndicator来实现，但是需要在Indicator的后面添加消息通知（BadgeView），可惜没有办法自定义Indicator，最后还是自己写了个实现。
主结构:ViewPager和FragmentPagerAdapter
效果图：
1、主布局文件
<?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="#eee"
android:orientation="vertical" >
<include layout="@layout/top1"/>
<include layout="@layout/top2"/>
<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>
2、top2.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:orientation="vertical" >
<LinearLayout
android:id="@+id/lllayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/id_tab_liaotian_ly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/guide_round"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dip" >
<TextView
android:id="@+id/id_liaotian"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="聊天"
android:textColor="@color/green"
android:textSize="15dip" />
</LinearLayout>
<LinearLayout
android:id="@+id/id_tab_faxian_ly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/guide_round"
android:clickable="true"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dip"
android:saveEnabled="false" >
<TextView
android:id="@+id/id_faxian"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="发现"
android:textColor="@color/black"
android:textSize="15dip" />
</LinearLayout>
<LinearLayout
android:id="@+id/id_tab_tongxunlu_ly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/guide_round"
android:focusable="false"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dip" >
<TextView
android:id="@+id/id_tongxunlu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="通讯录"
android:textColor="@color/black"
android:textSize="15dip" />
</LinearLayout>
</LinearLayout>
<ImageView
android:id="@+id/id_tab_line"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:background="@drawable/vpi__tab_selected_pressed_holo" >
</ImageView>
</LinearLayout>
这个布局也很简单，在布局中加入了一个ImageView，这个会在程序中动态计算宽度，作为Tab的引导线。
3、主程序
package com.example.mainframework04;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.widget.FrameLayout;
import android.widget.FrameLayout.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.jauker.widget.BadgeView;
public class MainActivity extends FragmentActivity
{
private ViewPager mViewPager;
private FragmentPagerAdapter mAdapter;
private List<Fragment> mFragments = new ArrayList<Fragment>();
/**
* 顶部三个LinearLayout
*/
private LinearLayout mTabLiaotian;
private LinearLayout mTabFaxian;
private LinearLayout mTabTongxunlun;
/**
* 顶部的三个TextView
*/
private TextView mLiaotian;
private TextView mFaxian;
private TextView mTongxunlu;
/**
* 分别为每个TabIndicator创建一个BadgeView
*/
private BadgeView mBadgeViewforLiaotian;
private BadgeView mBadgeViewforFaxian;
private BadgeView mBadgeViewforTongxunlu;
/**
* Tab的那个引导线
*/
private ImageView mTabLine;
/**
* ViewPager的当前选中页
*/
private int currentIndex;
/**
* 屏幕的宽度
*/
private int screenWidth;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
initView();
initTabLine();
/**
* 初始化Adapter
*/
mAdapter = new FragmentPagerAdapter(getSupportFragmentManager())
{
@Override
public int getCount()
{
return mFragments.size();
}
@Override
public Fragment getItem(int arg0)
{
return mFragments.get(arg0);
}
};
mViewPager.setAdapter(mAdapter);
/**
* 设置监听
*/
mViewPager.setOnPageChangeListener(new OnPageChangeListener()
{
@Override
public void onPageSelected(int position)
{
// 重置所有TextView的字体颜色
resetTextView();
switch (position)
{
case 0:
/**
* 设置消息通知
*/
mTabLiaotian.removeView(mBadgeViewforLiaotian);
mBadgeViewforLiaotian.setBadgeCount(5);
mTabLiaotian.addView(mBadgeViewforLiaotian);
mLiaotian.setTextColor(getResources().getColor(R.color.green));
break;
case 1:
/**
* 设置消息通知
*/
mFaxian.setTextColor(getResources().getColor(R.color.green));
mTabFaxian.removeView(mBadgeViewforFaxian);
mBadgeViewforFaxian.setBadgeCount(15);
mTabFaxian.addView(mBadgeViewforFaxian);
break;
case 2:
mTongxunlu.setTextColor(getResources().getColor(R.color.green));
break;
}
currentIndex = position;
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
/**
* 利用position和currentIndex判断用户的操作是哪一页往哪一页滑动
* 然后改变根据positionOffset动态改变TabLine的leftMargin
*/
if (currentIndex == 0 && position == 0)// 0->1
{
LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) mTabLine
.getLayoutParams();
lp.leftMargin = (int) (positionOffset * (screenWidth * 1.0 / 3) + currentIndex * (screenWidth / 3));
mTabLine.setLayoutParams(lp);
} else if (currentIndex == 1 && position == 0) // 1->0
{
LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) mTabLine
.getLayoutParams();
lp.leftMargin = (int) (-(1 - positionOffset) * (screenWidth * 1.0 / 3) + currentIndex
* (screenWidth / 3));
mTabLine.setLayoutParams(lp);
} else if (currentIndex == 1 && position == 1) // 1->2
{
LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) mTabLine
.getLayoutParams();
lp.leftMargin = (int) (positionOffset * (screenWidth * 1.0 / 3) + currentIndex * (screenWidth / 3));
mTabLine.setLayoutParams(lp);
} else if (currentIndex == 2 && position == 1) // 2->1
{
LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) mTabLine
.getLayoutParams();
lp.leftMargin = (int) (-(1 - positionOffset) * (screenWidth * 1.0 / 3) + currentIndex
* (screenWidth / 3));
mTabLine.setLayoutParams(lp);
}
}
@Override
public void onPageScrollStateChanged(int state)
{
}
});
mViewPager.setCurrentItem(1);
}
/**
* 根据屏幕的宽度，初始化引导线的宽度
*/
private void initTabLine()
{
mTabLine = (ImageView) findViewById(R.id.id_tab_line);
DisplayMetrics outMetrics = new DisplayMetrics();
getWindow().getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
screenWidth = outMetrics.widthPixels;
LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) mTabLine.getLayoutParams();
lp.width = screenWidth / 3;
mTabLine.setLayoutParams(lp);
}
/**
* 重置颜色
*/
protected void resetTextView()
{
mLiaotian.setTextColor(getResources().getColor(R.color.black));
mFaxian.setTextColor(getResources().getColor(R.color.black));
mTongxunlu.setTextColor(getResources().getColor(R.color.black));
}
/**
* 初始化控件，初始化Fragment
*/
private void initView()
{
mTabLiaotian = (LinearLayout) findViewById(R.id.id_tab_liaotian_ly);
mTabFaxian = (LinearLayout) findViewById(R.id.id_tab_faxian_ly);
mTabTongxunlun = (LinearLayout) findViewById(R.id.id_tab_tongxunlu_ly);
mLiaotian = (TextView) findViewById(R.id.id_liaotian);
mFaxian = (TextView) findViewById(R.id.id_faxian);
mTongxunlu = (TextView) findViewById(R.id.id_tongxunlu);
MainTab01 tab01 = new MainTab01();
MainTab02 tab02 = new MainTab02();
MainTab03 tab03 = new MainTab03();
mFragments.add(tab01);
mFragments.add(tab02);
mFragments.add(tab03);
mBadgeViewforFaxian = new BadgeView(this);
mBadgeViewforLiaotian = new BadgeView(this);
mBadgeViewforTongxunlu = new BadgeView(this);
}
}
主要就是为ViewPager设置FragmentPagerAdapter，然后添加切换的监听，生成BadgeView，这里没有使用BadgeView.setTargetView(targetView)，因为我希望通知显示在文本的后面，setTargetView可能只能设置显示位置为目标控件的内部位置。
再次就是TabLine的跟随手指的效果，首先会根据Tab页的数量为TabLine设置宽度，然后在onPageScrolled中根据position，positionOffset，currentIndex，判断用户当前手指滑动的方向，然后根据positionOffset这个百分比乘以TabLine的宽度，动态设置TabLine的leftMargin实现跟随手指移动的效果。
4、每个Fragment的代码
package com.example.mainframework04;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MainTab01 extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.main_tab_01, container, false);
}
}
3个标签页基本一致，不重复贴了。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ly_main_weixin"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#fcfcfc"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="this is first tab !"
android:textColor="#000000"
android:textSize="30sp"
/>
</LinearLayout>
Fragment的布局文件，同样三个基本一致。
好了，结束，看起来挺复杂，实现起来还可以。代码写得比较仓促，有啥不足地方请指出来。最后求留言，求赞~