健康栏目的实现

1.运行效果图

2.核心代码

MainActivity

public class MainActivity 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;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initViews();
initCursor();
initViewPager();
setListeners();
}

private void initViews() {
ivHealthBack = (ImageView) findViewById(R.id.icons_health_back);
tvCursor = (TextView) findViewById(R.id.cursor);
tvHealthNews = (TextView) findViewById(R.id.tv_healthnews);
tvIllnessDefense = (TextView) findViewById(R.id.tv_healthill);
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() {
@Override
public void onClick(View arg0) {
finish();
}
});

// 点击健康须知
tvHealthNews.setOnClickListener(new OnClickListener() {
@Override
public 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) {
}
});
}
}

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/icons_health_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
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>

activity_main.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>

activity_main.xml

<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=".MainActivity" >

<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="18dp"/>
<!--   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="18dp"/>
</LinearLayout>
<TextView
android:id="@+id/cursor"
android:layout_width="125dp"
android:layout_height="5dp"
android:layout_marginLeft="20dp"
android:background="#990033"/>
<android.suqqort.v4.view.ViewPage
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>

<span style="color:#FF6666;">HealthViewPagerAdapter.java</span> 

public class HealthViewPagerAdapter extends PagerAdapter{
private List<View> viewList;

public HealthViewPagerAdapter(List<View> viewList) {
this.viewList = viewList;
}
public int getCount(){
return viewList.size();
}

public boolean isViewFromObject(View view, Object object) {
return view == object;
}

public Object instantiateItem(ViewGroup container, int position) {
container.addView(viewList.get(position));
return viewList.get(position);
}

public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(viewList.get(position));
}
}

<span style="color:#FF6666;">HealthWebView.java</span> 

public class HealthWebView {
private Context context;

public HealthWebView(Context context) {
this.co
4000
ntext = 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);
// 设置支持 JavaScript 脚本
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;
}
}

3.实验总结

这是一个较为综合的实验，应用的活动较多，在编辑时，出现了许多小问题，通过百度和询问同学的已解决。此外实验需要怎加权限：<uses-permission android:name="android.permission.INTERNET" />