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

Posted 2020-06-14

一、简介

运行结果

二、代码
1.xml
(1)activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7         <Button android:id="@+id/btn_launch_oauth"
 8                 android:layout_width="fill_parent"
 9                 android:layout_height="wrap_content"
10                 android:text="Launch OAuth Flow"/>
11 
12         <Button 
13                 android:id="@+id/btn_sendWeiBo"
14                 android:layout_width="fill_parent"
15                 android:layout_height="wrap_content"
16                 android:text="发送一条微博消息"
17         />
18         <Button 
19                 android:id="@+id/btn_getWeiBoList"
20                 android:layout_width="fill_parent"
21                 android:layout_height="wrap_content"
22                 android:text="得到主页时间线数据"
23         />
24 </LinearLayout>

 

(2)AndroidManifest.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3       package="org.marsdroid.oauth05"
 4       android:versionCode="1"
 5       android:versionName="1.0">
 6     <uses-sdk android:minSdkVersion="10" />
 7 
 8     <uses-permission android:name="android.permission.INTERNET" />
 9     <application android:icon="@drawable/icon" android:label="@string/app_name">
10         <activity android:name=".MainActivity" android:label="@string/app_name">
11             <intent-filter>
12                 <action android:name="android.intent.action.MAIN" />
13                 <category android:name="android.intent.category.LAUNCHER" />
14             </intent-filter>
15         </activity>
16         <activity android:name=".PrepareRequestTokenActivity" android:launchMode="singleTask">
17             <intent-filter>
18                 <action android:name="android.intent.action.VIEW" />
19                 <category android:name="android.intent.category.DEFAULT" />
20                 <category android:name="android.intent.category.BROWSABLE" />
21                 <data android:scheme="x-oauthflow" android:host="callback" />
22             </intent-filter>
23         </activity>
24         <activity android:name=".BroadcastTimelineActivity"/>
25     </application>
26 </manifest>

(3)list.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <ListView 
 8     android:id="@android:id/list"
 9     android:layout_width="fill_parent"
10     android:layout_height="wrap_content"
11 ></ListView>
12 </LinearLayout>

 

(4)item.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7     <TextView 
 8         android:id="@+id/nameId"
 9         android:layout_width="fill_parent"    
10         android:layout_height="wrap_content"
11     />
12     <TextView
13         android:id="@+id/textId"
14         android:layout_height="wrap_content"
15         android:layout_width="fill_parent"
16         />
17 </LinearLayout>

 

2.java
(1)MainActivity.java

 1 import java.util.ArrayList;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 
 6 import org.marsdroid.model.WeiBoList;
 7 
 8 import oauth.signpost.OAuth;
 9 import android.app.Activity;
10 import android.content.Intent;
11 import android.content.SharedPreferences;
12 import android.os.Bundle;
13 import android.preference.PreferenceManager;
14 import android.view.View;
15 import android.view.View.OnClickListener;
16 import android.widget.Button;
17 
18 import com.google.gson.Gson;
19 
20 public class MainActivity extends Activity {
21     
22     final String TAG = getClass().getName();
23     private SharedPreferences prefs;
24     /** Called when the activity is first created. */
25     @Override
26     public void onCreate(Bundle savedInstanceState) {
27         super.onCreate(savedInstanceState);
28         setContentView(R.layout.main);
29         
30         prefs = PreferenceManager.getDefaultSharedPreferences(this);
31         Button launchOauth = (Button) findViewById(R.id.btn_launch_oauth);
32         Button sendWeiBoButton = (Button)findViewById(R.id.btn_sendWeiBo);
33         Button getWeiBoListButton = (Button)findViewById(R.id.btn_getWeiBoList);
34         
35         sendWeiBoButton.setOnClickListener(new OnClickListener() {
36             
37             @Override
38             public void onClick(View v) {
39                 //收集需要向腾讯微博服务器端发送的数据
40                 Map<String,String> map = new HashMap<String,String>();
41                 map.put("content", "test");
42                 map.put("clientip", "127.0.0.1");
43                 map.put("format", "json");
44                 //URL编码
45                 List<String> decodeNames = new ArrayList<String>();
46                 decodeNames.add("oauth_signature");
47                 //生成WeiboClient对象需要四个参数:Consumer_key,Consumer_key_secret,Oauth_tokent,OAuth_token_secret
48                 String OAuth_token = prefs.getString(OAuth.OAUTH_TOKEN, "");
49                 String OAuth_token_secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
50                 WeiBoClient weiBoClient = new WeiBoClient(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET, OAuth_token, OAuth_token_secret);
51                 weiBoClient.doPost("http://open.t.qq.com/api/t/add",map,decodeNames);
52             }
53         });
54         
55         getWeiBoListButton.setOnClickListener(new OnClickListener(){
56 
57             @Override
58             public void onClick(View v) {
59                 
60                 Intent intent = new Intent(MainActivity.this, BroadcastTimelineActivity.class);
61                 startActivity(intent);
62             }
63             
64         });
65         
66         launchOauth.setOnClickListener(new OnClickListener() {
67             public void onClick(View v) {
68                 startActivity(new Intent().setClass(v.getContext(), PrepareRequestTokenActivity.class));
69             }
70         });
71     }
72 
73 }

 

(2)BroadcastTimelineActivity.java

 1 import java.util.HashMap;
 2 import java.util.Map;
 3 
 4 import oauth.signpost.OAuth;
 5 
 6 import org.marsdroid.model.WeiBoList;
 7 
 8 import android.app.ListActivity;
 9 import android.content.SharedPreferences;
10 import android.os.Bundle;
11 import android.preference.PreferenceManager;
12 import android.widget.ListView;
13 
14 import com.google.gson.Gson;
15 
16 public class BroadcastTimelineActivity extends ListActivity{
17 
18     private SharedPreferences prefs;
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.list);
23         
24         prefs = PreferenceManager.getDefaultSharedPreferences(this);
25         Map<String,String> keyValues = new HashMap<String,String>();
26         keyValues.put("format", "json");
27         keyValues.put("pageflag", "0");
28         keyValues.put("pagetime", "0");
29         keyValues.put("reqnum", "20");
30         String OAuth_token = prefs.getString(OAuth.OAUTH_TOKEN, "");
31         String OAuth_token_secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
32         WeiBoClient weiBoClient = new WeiBoClient(Constants.CONSUMER_KEY, Constants.CONSUMER_SECRET, OAuth_token, OAuth_token_secret);
33         String result = weiBoClient.doGet(Constants.WeiBoApi.HOME_TIMELINE, keyValues);
34         Gson gson = new Gson();
35         WeiBoList weiBoList = gson.fromJson(result, WeiBoList.class);
36         WeiBoAdapter weiBoAdapter = new WeiBoAdapter(weiBoList, this);
37         ListView listView = getListView();
38         listView.setAdapter(weiBoAdapter);
39     }
40 
41 }

(3)WeiBoAdapter.java

 1 import java.util.HashMap;
 2 import java.util.List;
 3 import java.util.Map;
 4 
 5 import org.marsdroid.model.WeiBoData;
 6 import org.marsdroid.model.WeiBoList;
 7 
 8 import android.content.Context;
 9 import android.view.LayoutInflater;
10 import android.view.View;
11 import android.view.ViewGroup;
12 import android.widget.BaseAdapter;
13 import android.widget.TextView;
14 
15 public class WeiBoAdapter extends BaseAdapter{
16     //WeiBoList对象当中的数据，代表了服务器端所返回的所有数据
17     private WeiBoList weiBoList;
18     //info当中存储了一次所取回的所有微博数据
19     private List<WeiBoData> info = null;
20     //View对象的缓存,不用每次要数据都new 一个view对象
21     private Map<Integer,View> rowViews = new HashMap<Integer,View>();
22     private Context context = null;
23     
24     public WeiBoAdapter(WeiBoList weiBoList,Context context){
25         this.weiBoList = weiBoList;
26         info = weiBoList.getData().getInfo();
27         this.context = context;
28     }
29     //返回当中的Adapter当中，共包含多少个item
30     @Override
31     public int getCount() {
32         // TODO Auto-generated method stub
33         return info.size();
34     }
35     //根据位置，得到相应的item对象
36     @Override
37     public Object getItem(int position) {
38         // TODO Auto-generated method stub
39         return info.get(position);
40     }
41     //根据位置，得到相应的item对象的ID
42     @Override
43     public long getItemId(int position) {
44         // 这例子对id没什么要求
45         return position;
46     }
47 
48     //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
49     @Override
50     public View getView(int position, View convertView, ViewGroup parent) {
51         //convertView可以提高view的性能，涉及到数据结构的问题
52         View rowView = rowViews.get(position);
53         if(rowView == null){
54             //生成一个LayoutInflater对象，填充器
55             LayoutInflater layoutInflater = LayoutInflater.from(context);
56             //调用LayoutInflater对象的inflate方法，可以生成一个View对象，null是父控件
57             rowView = layoutInflater.inflate(R.layout.item, null);
58             //得到该View当中的两个控件
59             TextView nameView = (TextView)rowView.findViewById(R.id.nameId);
60             TextView textView = (TextView)rowView.findViewById(R.id.textId);
61             //调用getItem（）方法，得到对应位置的weiBoData对象
62             WeiBoData weiBoData = (WeiBoData)getItem(position);
63             nameView.setText(weiBoData.getName());
64             textView.setText(weiBoData.getText());
65             rowViews.put(position, rowView);//缓存取过的数据
66         }
67         return rowView;
68     }
69 
70 }