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;
    }

}