ANDROID_MARS学习笔记_S04_008_用Listview、自定义adapter显示返回的微博数据

一、简介

运行结果

二、代码
1.xml
(1)activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
         <Button android:id="@+id/btn_launch_oauth"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="Launch OAuth Flow"/>

         <Button
                 android:id="@+id/btn_sendWeiBo"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="发送一条微博消息"
         />
         <Button
                 android:id="@+id/btn_getWeiBoList"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="得到主页时间线数据"
         />
 </LinearLayout>

(2)AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.marsdroid.oauth05"
       android:versionCode="1"
       android:versionName="1.0">
     <uses-sdk android:minSdkVersion="10" />

     <uses-permission android:name="android.permission.INTERNET" />
     <application android:icon="@drawable/icon" android:label="@string/app_name">
         <activity android:name=".MainActivity" android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity android:name=".PrepareRequestTokenActivity" android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
                 <data android:scheme="x-oauthflow" android:host="callback" />
             </intent-filter>
         </activity>
         <activity android:name=".BroadcastTimelineActivity"/>
     </application>
 </manifest>

(3)list.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <ListView
     android:id="@android:id/list"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
 ></ListView>
 </LinearLayout>

(4)item.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
     <TextView
         android:id="@+id/nameId"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
     />
     <TextView
         android:id="@+id/textId"
         android:layout_height="wrap_content"
         android:layout_width="fill_parent"
         />
 </LinearLayout>

2.java
(1)MainActivity.java

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import org.marsdroid.model.WeiBoList;

 import oauth.signpost.OAuth;
 import android.app.Activity;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 import com.google.gson.Gson;

 public class MainActivity extends Activity {

     final String TAG = getClass().getName();
     private SharedPreferences prefs;
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         prefs = PreferenceManager.getDefaultSharedPreferences(this);
         Button launchOauth = (Button) findViewById(R.id.btn_launch_oauth);
         Button sendWeiBoButton = (Button)findViewById(R.id.btn_sendWeiBo);
         Button getWeiBoListButton = (Button)findViewById(R.id.btn_getWeiBoList);

         sendWeiBoButton.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 //收集需要向腾讯微博服务器端发送的数据
                 Map<String,String> map = new HashMap<String,String>();
                 map.put("content", "test");
                 map.put("clientip", "127.0.0.1");
                 map.put("format", "json");
                 //URL编码
                 List<String> decodeNames = new ArrayList<String>();
                 decodeNames.add("oauth_signature");
                 //生成WeiboClient对象需要四个参数:Consumer_key,Consumer_key_secret,Oauth_tokent,OAuth_token_secret
                 String OAuth_token = prefs.getString(OAuth.OAUTH_TOKEN, "");
                 String OAuth_token_secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
                 WeiBoClient weiBoClient = new WeiBoClient(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET, OAuth_token, OAuth_token_secret);
                 weiBoClient.doPost("http://open.t.qq.com/api/t/add",map,decodeNames);
             }
         });

         getWeiBoListButton.setOnClickListener(new OnClickListener(){

             @Override
             public void onClick(View v) {

                 Intent intent = new Intent(MainActivity.this, BroadcastTimelineActivity.class);
                 startActivity(intent);
             }

         });

         launchOauth.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
                 startActivity(new Intent().setClass(v.getContext(), PrepareRequestTokenActivity.class));
             }
         });
     }

 }

(2)BroadcastTimelineActivity.java

 import java.util.HashMap;
 import java.util.Map;

 import oauth.signpost.OAuth;

 import org.marsdroid.model.WeiBoList;

 import android.app.ListActivity;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.widget.ListView;

 import com.google.gson.Gson;

 public class BroadcastTimelineActivity extends ListActivity{

     private SharedPreferences prefs;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.list);

         prefs = PreferenceManager.getDefaultSharedPreferences(this);
         Map<String,String> keyValues = new HashMap<String,String>();
         keyValues.put("format", "json");
         keyValues.put("pageflag", "0");
         keyValues.put("pagetime", "0");
         keyValues.put("reqnum", "20");
         String OAuth_token = prefs.getString(OAuth.OAUTH_TOKEN, "");
         String OAuth_token_secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
         WeiBoClient weiBoClient = new WeiBoClient(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET, OAuth_token, OAuth_token_secret);
         String result = weiBoClient.doGet(Constants.WeiBoApi.HOME_TIMELINE, keyValues);
         Gson gson = new Gson();
         WeiBoList weiBoList = gson.fromJson(result, WeiBoList.class);
         WeiBoAdapter weiBoAdapter = new WeiBoAdapter(weiBoList, this);
         ListView listView = getListView();
         listView.setAdapter(weiBoAdapter);
     }

 }

(3)WeiBoAdapter.java

 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import org.marsdroid.model.WeiBoData;
 import org.marsdroid.model.WeiBoList;

 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.TextView;

 public class WeiBoAdapter extends BaseAdapter{
     //WeiBoList对象当中的数据，代表了服务器端所返回的所有数据
     private WeiBoList weiBoList;
     //info当中存储了一次所取回的所有微博数据
     private List<WeiBoData> info = null;
     //View对象的缓存,不用每次要数据都new 一个view对象
     private Map<Integer,View> rowViews = new HashMap<Integer,View>();
     private Context context = null;

     public WeiBoAdapter(WeiBoList weiBoList,Context context){
         this.weiBoList = weiBoList;
         info = weiBoList.getData().getInfo();
         this.context = context;
     }
     //返回当中的Adapter当中，共包含多少个item
     @Override
     public int getCount() {
         // TODO Auto-generated method stub
         return info.size();
     }
     //根据位置，得到相应的item对象
     @Override
     public Object getItem(int position) {
         // TODO Auto-generated method stub
         return info.get(position);
     }
     //根据位置，得到相应的item对象的ID
     @Override
     public long getItemId(int position) {
         // 这例子对id没什么要求
         return position;
     }

     //ListView通过调用getView()方法，得到相应的View对象，并将其显示在Activity当中
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         //convertView可以提高view的性能，涉及到数据结构的问题
         View rowView = rowViews.get(position);
         if(rowView == null){
             //生成一个LayoutInflater对象，填充器
             LayoutInflater layoutInflater = LayoutInflater.from(context);
             //调用LayoutInflater对象的inflate方法，可以生成一个View对象，null是父控件
             rowView = layoutInflater.inflate(R.layout.item, null);
             //得到该View当中的两个控件
             TextView nameView = (TextView)rowView.findViewById(R.id.nameId);
             TextView textView = (TextView)rowView.findViewById(R.id.textId);
             //调用getItem（）方法，得到对应位置的weiBoData对象
             WeiBoData weiBoData = (WeiBoData)getItem(position);
             nameView.setText(weiBoData.getName());
             textView.setText(weiBoData.getText());
             rowViews.put(position, rowView);//缓存取过的数据
         }
         return rowView;
     }

 }