健康栏目的实现

预期效果

实际效果：程序出现闪退或停止运行，正在尝试排错。。。

Error位置

HealthActivity.java

package com.walkersimulate;import java.util.ArrayList;import java.util.List;import android.app.ActionBar.LayoutParams;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.util.DisplayMetrics;import android.view.Display;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class HealthActivity extends Activity{private int currIndex;// 当前页卡编号 private TextView tvCursor;private TextView tvHealthNews; private TextView tvIllnessDefense; private ViewPager vpHealth;private ImageView ivHealthBack;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_health); initViews();initCursor(); initViewPager(); setListeners(); }private void initViews(){ ivHealthBack=(ImageView)findViewById(R.id.iv_HealthBack); tvCursor=(TextView)findViewById(R.id.cursor); tvHealthNews=(TextView)findViewById(R.id.tv_healthnews);//tvIllnessDefense=(TextView)findViewById(R.id.tv_IllDefense); vpHealth= (ViewPager)findViewById(R.id.viewpager);}private void initCursor(){Display display= getWindow().getWindowManager().getDefaultDisplay(); DisplayMetrics metrics= new DisplayMetrics(); display.getMetrics(metrics); // 取得手机屏幕宽度的一半int tabLineLength=metrics.widthPixels/2;// 设置游标的宽度为屏幕宽度的一半 LayoutParams lp=(LayoutParams) tvCursor.getLayoutParams(); lp.width=tabLineLength;    tvCursor.setLayoutParams(lp);}private void initViewPager(){ vpHealth= (ViewPager)findViewById(R.id.viewpager); List<View>views =new ArrayList<View>(); views.add(new HealthWebView(this) .getView("http://cms.hxky.cn/wap/jkxz/")); views.add(new HealthWebView(this) .getView("http://cms.hxky.cn/wap/jbfz/")); vpHealth.setAdapter(new HealthViewPagerAdapter(views)); // 给 ViewPager 设置适配器 vpHealth.setCurrentItem(0);// 设置当前显示标签页为第一页 }private void setListeners(){ // 返回按钮 ivHealthBack.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0){ finish(); }});// 点击健康须知tvHealthNews.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View view){ vpHealth.setCurrentItem(0); }}); // 点击疾病防治 tvIllnessDefense.setOnClickListener(new OnClickListener(){@Override public void onClick(View view){ vpHealth.setCurrentItem(1); }});vpHealth.setOnPageChangeListener(new OnPageChangeListener(){@Override public void onPageSelected(int position){ currIndex=position; }@Override public void onPageScrolled(int position,float percent,int ag2){ LinearLayout.LayoutParams ll = (android.widget.LinearLayout.LayoutParams)tvCursor .getLayoutParams();if(currIndex== position){ ll.leftMargin=(int)(currIndex*tvCursor.getWidth()+percent *tvCursor.getWidth()); }else if(currIndex>position){ ll.leftMargin=(int)(currIndex*tvCursor.getWidth()-(1-percent) *tvCursor.getWidth()); } tvCursor.setLayoutParams(ll);}@Override public void onPageScrollStateChanged(int position){}});}}

HealthViewPagerAdapter.java

package com.walkersimulate;import java.util.List;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;public class HealthViewPagerAdapter extends PagerAdapter{private List<View>viewList;public HealthViewPagerAdapter(List<View>viewList){this.viewList=viewList;}@Overridepublic int getCount(){return viewList.size();} @Override public boolean isViewFromObject(View view,Object object){ return view==object;} @Override public Object instantiateItem(ViewGroup container,int position){container.addView(viewList.get(position)); return viewList.get(position);} @Overridepublic void destroyItem(ViewGroup container,int position,Object object){ container.removeView(viewList.get(position)); }}

HealthWebView.java

package com.walkersimulate;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.webkit.WebView;import android.webkit.WebViewClient;public class HealthWebView{ private Context context;public HealthWebView(Context context){ this.context= context;}public View getView(String url){View view =LayoutInflater.from(context).inflate(R.layout.pagerofhealth,null); WebView webView=(WebView)view.findViewById(R.id.wvHealth);webView.loadUrl(url);webView.getSettings().setJavaScriptEnabled(true); //禁止系统浏览器打开页面 webView.setWebViewClient(new WebViewClient(){@Override public boolean shouldOverrideUrlLoading(WebView view,String url){ view.loadUrl(url);return true; } }); return view;}}

activity_health.xml

<?xml version="1.0" encoding="utf-8"?>            <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:orientation="vertical"     tools:context=".HealthActivity">     <include  layout="@layout/health_layout_titlebar"/>      <LinearLayout          android:layout_width="match_parent"          android:layout_height="wrap_content">          <!-- 健康新知 -->           <TextView               android:id="@+id/tv_healthnews"               android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:layout_weight="1"                android:gravity="center"                android:padding="6dp"                android:text="@string/healthnews"                android:textSize="18sp"/>           <!-- 疾病防治 -->            <TextView                android:id="@+id/tv_healthill"               android:layout_width="wrap_content"                android:layout_height="wrap_content"                 android:layout_gravity="center"                 android:layout_weight="1"                 android:gravity="center"                 android:padding="6dp"                 android:text="@string/illdefense"                 android:textSize="18sp"/>                 </LinearLayout>                 <TextView                     android:id="@+id/cursor"                      android:layout_width="125dp"                      android:layout_height="5dp"                     android:layout_marginLeft="20dp"                      android:background="#990033"/>                                     <android.support.v4.view.ViewPager                          android:id="@+id/viewpager"                          android:layout_width="match_parent"                           android:layout_height="match_parent"/>                        </LinearLayout> 

health_layout_titlebar.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"      android:layout_height="wrap_content"       android:background="@drawable/titlebar_bg">       <ImageView           android:id="@+id/iv_HealthBack"           android:layout_width="wrap_content"           android:layout_height="wrap_content"           android:layout_gravity="center"           android:gravity="center"           android:onClick=""          android:paddingLeft="6dp"           android:src="@drawable/icons_health_back"/>       <TextView android:id="@+id/title"            android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_gravity="center"              android:layout_weight="1"              android:gravity="center"              android:text="健康"              android:textColor="#ffffff"              android:textSize="15sp"/></LinearLayout>

pagerofhealth.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"><WebView    android:id="@+id/wvHealth"    android:layout_width="match_parent"    android:layout_height="match_parent"     /></RelativeLayout>