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android ViewPager学习笔记1
1、客户端代码
1.1第一个界面
public class MainActivity extends FragmentActivity {
private ViewPager viewPager;
private List<Fragment> items;
private List<String> titles;
private MyFragmentPagerAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) this.findViewById(R.id.viewpager);
items = new ArrayList<Fragment>();
Fragment1 fragment1 = new Fragment1();
Fragment2 fragment2 = new Fragment2();
items.add(fragment1);
items.add(fragment2);
titles = new ArrayList<String>();
titles.add("第一个页面");
titles.add("第二个页面");
adapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
return items.get(arg0);
}
@Override
public CharSequence getPageTitle(int position) {
// TODO Auto-generated method stub
return titles.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}对应的布局：
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center" >
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pagertitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top" >
</android.support.v4.view.PagerTitleStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>1.2第二个界面
public class Fragment1 extends ListFragment implements OnScrollListener {
private String path = "http://172.22.122.1:8080/viewpager/servlet/CityAction?pageNo=";
private static int pageNo = 1;// 默认是第一页
private List<String> total_list;
private MyAdapter adapter;
private boolean is_scrolling = false;// 是否需要滚动
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
adapter = new MyAdapter();
new MyTask().execute(path + pageNo);
}
public class MyTask extends AsyncTask<String, Void, List<String>> {
@Override
protected List<String> doInBackground(String... params) {
// TODO Auto-generated method stub
List<String> list = new ArrayList<String>();
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(params[0]);
HttpResponse response = null;
try {
response = httpClient.execute(httpPost);
if (response.getStatusLine().getStatusCode() == 200) {
String jsonString = EntityUtils.toString(
response.getEntity(), "utf-8");
JSONArray jsonArray = new JSONObject(jsonString)
.getJSONArray("citys");
for (int i = 0; i < jsonArray.length(); i++) {
list.add(jsonArray.getString(i));
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
} finally {
httpClient.getConnectionManager().shutdown();
}
return list;
}
@Override
protected void onPostExecute(List<String> result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
// 调用适配器绑定数据
adapter.bindData(result);
setListAdapter(adapter);
adapter.notifyDataSetChanged();
pageNo++;// 页码加一
}
}
public class MyAdapter extends BaseAdapter {
private List<String> list;
public void bindData(List<String> list) {
this.list = list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View view = null;
if (convertView == null) {
view = LayoutInflater.from(getActivity()).inflate(
R.layout.item, null);
} else {
view = convertView;
}
TextView textView = (TextView) view.findViewById(R.id.textView1);
textView.setText(list.get(position));
return view;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.f1, null);
return view;
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
@Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
getListView().setOnScrollListener(this);
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
// 表示用户不在滑动屏幕
if (is_scrolling && OnScrollListener.SCROLL_STATE_IDLE == scrollState) {
new MyTask().execute(path + pageNo);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
if (firstVisibleItem + visibleItemCount == totalItemCount
&& totalItemCount != 0) {
is_scrolling = true;
} else {
is_scrolling = false;
}
}
}对应布局：
<?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:orientation="vertical"
android:paddingLeft="8dp"
android:paddingRight="8dp" >
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:drawSelectorOnTop="false" />
</LinearLayout>1.3第三个界面public class Fragment2 extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.f2, null);
return view;
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
}
对应的布局：
<?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:orientation="vertical" >
<ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RatingBar
android:id="@+id/ratingBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
效果：
android ViewPager学习笔记1
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