五、微信界面

在res里边建drawable,drawable里边建selector下的sel_r.xml:

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

在drawable-hdpi里边放两张带圈的图形

1.布局：

activity_main.xml:

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

</LinearLayout>

写四个frag.xml

2.主方法：MainActivity

package com.example.day09a_03_wechat;

import java.util.ArrayList;

import android.app.Activity;
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.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends FragmentActivity {

private ViewPager pager;
private RadioGroup radioGroup;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       pager = (ViewPager) findViewById(R.id.pager);
       radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
       // 设置第一个选中
       radioGroup.check(radioGroup.getChildAt(0).getId());
       // 数据
       final ArrayList<Fragment> list = new ArrayList<Fragment>();
       Frag_01 frag_01 = new Frag_01();
       Frag_02 frag_02 = new Frag_02();
       Frag_03 frag_03 = new Frag_03();
       Frag_04 frag_04 = new Frag_04();
       list.add(frag_01);
       list.add(frag_02);
       list.add(frag_03);
       list.add(frag_04);
       // 适配器
       // FragmentPagerAdapter(注意这里有参数记得写,不然就报错了)
       pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {

@Override
public int getCount() {

return list.size();
}

@Override
public Fragment getItem(int arg0) {

               return list.get(arg0);
           }
       });
       // 页面切换按钮跟着切换
       pager.setOnPageChangeListener(new OnPageChangeListener() {

           @Override
           public void onPageSelected(int arg0) {
               radioGroup.check(radioGroup.getChildAt(arg0).getId());

}

           @Override
           public void onPageScrolled(int arg0, float arg1, int arg2) {
               // TODO Auto-generated method stub

}

           @Override
           public void onPageScrollStateChanged(int arg0) {
               // TODO Auto-generated method stub

           }
       });
       // 点击按钮页面切换
       radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

           @Override
           public void onCheckedChanged(RadioGroup group, int checkedId) {
               switch (checkedId) {
               case R.id.radio0:
                   pager.setCurrentItem(0);
                   break;
               case R.id.radio1:
                   pager.setCurrentItem(1);
                   break;
               case R.id.radio2:
                   pager.setCurrentItem(2);
                   break;
               case R.id.radio3:
                   pager.setCurrentItem(3);
                   break;

}

}
});

}

3.写四个不一样的frag.java:

package com.example.day09a_03_wechat;

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

public class Frag_01 extends Fragment{

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
           Bundle savedInstanceState) {
       View view = inflater.inflate(R.layout.frag_01, container,false);
      return view ;
   }
}

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