如何解析Sub JSONArray并显示图像？

您有两个问题，第一个是如何解析sub json；第二个是如何解析sub
json。第二，如何从网上显示图像；我通过您的示例json网址成功进行了演示，如下所示：

首先，定义一个数据类：Data.java

    package com.example.jsonparser;import java.util.ArrayList;public class Data {    private String mState;    private String mImageUrl;    private String mTitle;    private String mSummary;    private ArrayList<String> mAddList;    private String mUrl;    public Data(String mState, String mImageUrl, String mTitle, String mSummary, ArrayList<String> addList, String mUrl) {        super();        this.mState = mState;        this.mImageUrl = mImageUrl;        this.mTitle = mTitle;        this.mSummary = mSummary;        this.mAddList = addList;        this.mUrl = mUrl;    }    public String getmState() {        return mState;    }    public void setmState(String mState) {        this.mState = mState;    }    public String getmImageUrl() {        return mImageUrl;    }    public void setmImageUrl(String mImageUrl) {        this.mImageUrl = mImageUrl;    }    public String getmTitle() {        return mTitle;    }    public void setmTitle(String mTitle) {        this.mTitle = mTitle;    }    public String getmSummary() {        return mSummary;    }    public void setmSummary(String mSummary) {        this.mSummary = mSummary;    }    public ArrayList<String> getmAddress1() {        return mAddList;    }    public void setmAddress1(ArrayList<String> mAddress1) {        this.mAddList = mAddress1;    }    public String getmUrl() {        return mUrl;    }    public void setmUrl(String mUrl) {        this.mUrl = mUrl;    }}

其次，定义用于解析json字符串的解析器类：Parser.java

 package com.example.jsonparser;import java.util.ArrayList;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import android.util.Log;public class Parser {    private ArrayList<Data> mDataSource = new ArrayList<Data>();    public Parser(String json) {        jsonParser(json);    }    private void jsonParser(String json) {        try { JSonObject obj = new JSonObject(json); JSonObject var = obj.getJSonObject("data"); JSonArray list = var.getJSonArray("product"); int len  = list.length(); for (int i = 0; i < len; i++) {     try {         JSonObject data = list.getJSonObject(i);         String state = data.getString("state");         String image = data.getString("image");         String title = data.getString("title");         String summary = data.getString("summary");         String url = data.getString("url");         ArrayList<String> addList = new ArrayList<String>();         JSonArray addArray = data.getJSonArray("address");         int size = addArray.length();                  for(int j = 0; j < size; j++) {  addList.add(addArray.getJSonObject(j).getString("address"));         }         mDataSource.add(new Data(state, image, title, summary, addList, url));     } catch (JSonException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } }        } catch (JSonException e) { // TODO Auto-generated catch block e.printStackTrace();        }    }    public ArrayList<Data> getSource() {        return mDataSource;    }}

第三，通过URL定义任务下载图像：DownloadImageTask.java

    package com.example.jsonparser;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.widget.ImageView;public class DownloadImageTask extends AsyncTask<Void, Void, Bitmap> {    private String mUrl;    private ImageView mImageView = null;    public DownloadImageTask(String Url, ImageView imageView) {        mUrl = Url;        this.mImageView = imageView;    }    protected void onPostExecute(Bitmap result) {        super.onPostExecute(result);        if (result != null) { mImageView.setImageBitmap(result);        }    }    protected Bitmap doInBackground(Void... params) {        Bitmap bitmap = getBitmap(mUrl);        return bitmap;    }    public Bitmap getBitmap(String imageUrl) {        Bitmap mBitmap = null;        try { URL url = new URL(imageUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); InputStream is = conn.getInputStream(); mBitmap = BitmapFactory.depreStream(is);        } catch (MalformedURLException e) { e.printStackTrace();        } catch (IOException e) { e.printStackTrace();        }        return mBitmap;    }}

第四，定义一个适配器扩展baseAdapter来显示数据和图像：Adapter.java

    package com.example.jsonparser;import java.util.ArrayList;import android.app.Activity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AbsListView.RecyclerListener;import android.widget.baseAdapter;import android.widget.ImageView;import android.widget.TextView;public class Adapter extends baseAdapter {    private static final String TAG = "Adapter";    private Activity mActivity;    public ArrayList<Data> mObjects;    static class ViewHolder {        ImageView icon;        TextView title;        DownloadImageTask mTask;    }    public Adapter(Activity activity, ArrayList<Data> mObjects) {        this.mActivity = (Activity) activity;        this.mObjects = mObjects;    }    public void setObjects(ArrayList<Data> mObjects) {        this.mObjects = mObjects;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Data item = mObjects.get(position);        View rowView = convertView;        if (rowView == null) { LayoutInflater inflater = mActivity.getLayoutInflater(); rowView = inflater.inflate(R.layout.item, parent, false); ViewHolder viewHolder = new ViewHolder(); viewHolder.icon = (ImageView) rowView.findViewById(R.id.image); viewHolder.title = (TextView) rowView.findViewById(R.id.title); rowView.setTag(viewHolder);        }        ViewHolder holder = (ViewHolder) rowView.getTag();        holder.title.setText(item.getmTitle());        holder.icon.setBackgroundResource(R.drawable.ic_launcher);        holder.mTask = new DownloadImageTask(item.getmImageUrl(), holder.icon);        if (!holder.mTask.isCancelled()) { holder.mTask.execute();        }        return rowView;    }    @Override    public int getCount() {        return (this.mObjects.size());    }    @Override    public Object getItem(int position) {        return (this.mObjects.get(position));    }    @Override    public long getItemId(int position) {        return (position);    }    public AbsListView.RecyclerListener mRecyclerListener = new RecyclerListener( ){        public void onMovedToScrapHeap(View view) { ViewHolder viewHolder = (ViewHolder) view.getTag(); DownloadImageTask imagetask = viewHolder.mTask; if (imagetask != null) {     imagetask.cancel(true); }        }    };}

最后，在活动中使用以下类：MainActivity.java

    package com.example.jsonparser;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.ListView;public class MainActivity extends Activity {    private ListView mListView;    private Adapter mAdapter;    private ArrayList<Data> mSource = new ArrayList<Data>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mListView = (ListView) findViewById(android.R.id.list);        mAdapter = new Adapter(this, mSource);        mListView.setAdapter(mAdapter);        mListView.setRecyclerListener(mAdapter.mRecyclerListener);        final String url = "http://metalgearrisingguide.com/samplejson.json";        new Thread(new Runnable() { @Override public void run() {     Parser parser = new Parser(getJSonfromURL(url));     mSource = parser.getSource();     Message msg = mHandler.obtainMessage();     mHandler.sendMessage(msg); }        }).start();    }    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) { mAdapter.setObjects(mSource); mAdapter.notifyDataSetChanged();        }    };    public String getJSonfromURL(String url) {        InputStream is = null;        String result = "";        // http post        try { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent();        } catch (Exception e) { Log.e("log_tag", "Error in http connection " + e.toString());        }        // convert response to string        try { BufferedReader reader = new BufferedReader(new InputStreamReader(         is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) {     sb.append(line + "n"); } is.close(); result = sb.toString();        } catch (Exception e) { Log.e("log_tag", "Error converting result " + e.toString());        }        return result;    }}

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"    tools:context=".MainActivity" >    <ListView        android:id="@android:id/list"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:cacheColorHint="@android:color/transparent" /></LinearLayout>

item.xml

    <?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="wrap_content"    android:orientation="horizontal" >    <ImageView        android:id="@+id/image"        android:layout_width="40dp"        android:layout_height="40dp"        android:layout_gravity="left|top"        android:layout_marginBottom="10dp"        android:layout_marginLeft="10dp"        android:layout_marginTop="10dp" />    <TextView        android:id="@+id/title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:ellipsize="end"        android:gravity="left|top"        android:lineSpacingExtra="3.0dp"        android:textColor="#ffffff"        android:textSize="15sp" /></LinearLayout>

就这样。