<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><android.support.v4.view.ViewPagerandroid:id="@+id/Mypager"android:layout_width="match_parent"android:layout_height="150dp"></android.support.v4.view.ViewPager><LinearLayoutandroid:orientation="horizontal"android:layout_width="match_parent"android:layout_height="wrap_content"><EditTextandroid:id="@+id/editquery"android:layout_weight="1"android:hint="请输入要查询的城市"android:layout_width="match_parent"android:layout_height="wrap_content" /><Buttonandroid:id="@+id/weatherquery"android:layout_weight="3"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="查询天气"/></LinearLayout><TextViewandroid:id="@+id/weatherText"android:layout_width="match_parent"android:layout_height="150dp" /></LinearLayout>

package com.example.shexinhai_08222;import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.util.ArrayList;public class MainActivity extends AppCompatActivity implements View.OnClickListener {private ViewPager viewPager1;private Button btnweather,btnlvshi;ArrayList<Button> viewlist = new ArrayList<Button>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.item);initView();viewPager1.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {@Overridepublic int getCount() {return 2;}@Overridepublic Fragment getItem(int position) {Fragment fragment = null;switch (position){case 0:fragment = new WeatherFragment();break;case 1:fragment = new LvshiFragment();break;}return fragment;}});viewPager1.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {for(int i = 0;i<viewlist.size();i ++){Button button = viewlist.get(i);if (i==position) {button.setTextColor(Color.RED);}else {button.setTextColor(Color.BLACK);}}}@Overridepublic void onPageScrollStateChanged(int state) {}});}private void initView(){viewPager1 = (ViewPager) findViewById(R.id.mypagerall);btnweather = (Button) findViewById(R.id.weather);btnlvshi = (Button) findViewById(R.id.lvshi);viewlist.add(btnweather);viewlist.add(btnlvshi);for (int i = 0;i<viewlist.size();i++){viewlist.get(i).setOnClickListener(this);}}@Overridepublic void onClick(View view) {switch (view.getId()){case R.id.weather:viewPager1.setCurrentItem(0);break;case R.id.lvshi:viewPager1.setCurrentItem(1);break;}}}