Android 使用JSON解析地震信息

我试图从中解析地震坐标并在文本视图中显示它。但它不起作用。。。文本视图不显示任何内容，并保持空白。。这是我的代码：

包com.googlemaps

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class Json extends Activity  {

TextView txtJson;
HttpClient client;
JSONObject json;
String data;

final static String URL = "http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/";


@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.json);
txtJson = (TextView) findViewById(R.id.txtJson);
client = new DefaultHttpClient();
new Read().execute("features");
}

public JSONObject earthquake(String magnitude) throws ClientProtocolException, IOException, JSONException{

StringBuilder url = new StringBuilder(URL);
url.append(magnitude);
HttpGet get = new HttpGet(url.toString());
HttpResponse response =  client.execute(get);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200){
     HttpEntity ent = response.getEntity();
     String data= EntityUtils.toString(ent);

     JSONObject main_obj = new JSONObject(data);
     JSONArray list = main_obj.getJSONArray("features");
     JSONObject latest = list.getJSONObject(0);
     JSONObject geometry_obj = latest.getJSONObject("geometry");

    return geometry_obj;
}

Toast.makeText(this,"failed" , Toast.LENGTH_SHORT).show();
return null;

}
public class Read extends AsyncTask<String, Integer, String>{

@Override
protected String doInBackground(String... arg0) {
    // TODO Auto-generated method stub
    String re = "";
    try {

        StringBuilder stringBuilder = new StringBuilder();
        json = earthquake("4.5_day.geojson");
        JSONArray coordinates_array = json.getJSONArray("coordinates");
        for(int i = 0; i < coordinates_array.length(); i++){
           stringBuilder.append("Some text"coordinates_array.getString(i));
        }
        re = stringBuilder.toString();
        return re;
    }
    finally{}
}
@Override
protected void onPostExecute(String result) {
    // TODO Auto-generated method stub
    txtJson.setText(result);

}    
}

}

import java.io.IOException；
导入org.apache.http.HttpEntity；
导入org.apache.http.HttpResponse；
导入org.apache.http.client.ClientProtocolException；
导入org.apache.http.client.HttpClient；
导入org.apache.http.client.methods.HttpGet；
导入org.apache.http.impl.client.DefaultHttpClient；
导入org.apache.http.util.EntityUtils；
导入org.json.JSONArray；
导入org.json.JSONException；
导入org.json.JSONObject；
导入android.app.Activity；
导入android.os.AsyncTask；
导入android.os.Bundle；
导入android.widget.TextView；
导入android.widget.Toast；
公共类Json扩展活动{
TextView-txtJson；
HttpClient；
JSONObject json；
字符串数据；
最终静态字符串URL=”http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/";
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
//TODO自动生成的方法存根
super.onCreate（savedInstanceState）；
setContentView（R.layout.json）；
txtJson=（TextView）findViewById（R.id.txtJson）；
client=新的DefaultHttpClient（）；
新建读取（）。执行（“功能”）；
}
公共JSONObject地震（字符串震级）抛出ClientProtocolException、IOException、JSONException{
StringBuilder url=新的StringBuilder（url）；
url.append（数量级）；
HttpGet=newhttpget（url.toString（））；
HttpResponse response=client.execute（get）；
int statusCode=response.getStatusLine（）.getStatusCode（）；
如果（状态代码==200）{
HttpEntity ent=response.getEntity（）；
字符串数据=EntityUtils.toString（ent）；
JSONObject main_obj=新的JSONObject（数据）；
JSONArray list=main_obj.getJSONArray（“特性”）；
JSONObject latest=list.getJSONObject（0）；
JSONObject geometry_obj=最新的.getJSONObject（“geometry”）；
返回几何体_obj；
}
Toast.makeText（这个“失败”，Toast.LENGTH_SHORT）.show（）；
返回null；
}
公共类读取扩展异步任务{
@凌驾
受保护的字符串doInBackground（字符串…arg0）{
//TODO自动生成的方法存根
字符串re=“”；
试一试{
StringBuilder StringBuilder=新的StringBuilder（）；
json=地震（“4.5_day.geojson”）；
JSONArray coordinates_array=json.getJSONArray（“坐标”）；
对于（int i=0；i

这是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="match_parent"
android:orientation="vertical" >
<TextView
    android:id="@+id/txtJson"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Loading Data..."
    android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

这是我的logcat数据：

02-08 04:23:58.908: I/Choreographer(2559): Skipped 91 frames!  The application may be doing too much work on its main thread.
02-08 04:23:59.228: I/Choreographer(2559): Skipped 301 frames!  The application may be doing too much work on its main thread.
02-08 04:24:24.608: I/Choreographer(2559): Skipped 77 frames!  The application may be doing too much work on its main thread.
02-08 04:24:26.398: D/dalvikvm(2559): GC_FOR_ALLOC freed 375K, 14% free 3060K/3536K, paused 92ms, total 92ms
02-08 04:24:26.498: W/System.err(2559): org.json.JSONException: Value {"features":   [{"id":"usc000mkv5","type":"Feature","geometry":{"type":"Point","coordinates":[159.5419,-9.7067,41.51]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mkv5.geojson","type":"earthquake","net":"us","tsunami":null,"sources":",us,","title":"M 5.1 - 54km SW of Honiara, Solomon    Islands","time":1391838013570,"updated":1391843853000,"mag":5.1,"types":",cap,dyfi,geoserve,nearby-cities,origin,phase-data,tectonic-summary,","place":"54km SW of Honiara, Solomon Islands","status":"reviewed","ids":",usc000mkv5,","alert":null,"rms":0.59,"code":"c000mkv5","url":"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usc000mkv5","magType":"mb","mmi":null,"cdi":1,"tz":660,"felt":0,"nst":null,"dmin":9.404,"gap":94,"sig":400}},{"id":"usc000mktr","type":"Feature","geometry":{"type":"Point","coordinates":[141.0819,37.092,54.23]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mktr.geojson","type":"earthquake","net":"us","tsunami":null,"sources":",us,","title":"M 5.0 - 18km ENE of Iwaki, Japan","time":1391826863590,"updated":1391828049000,"mag":5,"types":",cap,dyfi,general-link,geoserve,nearby-cities,origin,phase-data,tectonic-summary,","place":"18km ENE of Iwaki, Japan","status":"reviewed","ids":",usc000mktr,","alert":null,"rms":0.72,"code":"c000mktr","url":"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usc000mktr","magType":"mb","mmi":null,"cdi":1,"tz":540,"felt":0,"nst":null,"dmin":2.369,"gap":123,"sig":385}},{"id":"usc000mksz","type":"Feature","geometry":{"type":"Point","coordinates":[54.2342,39.8122,10.69]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mksz.geojson","type":"earthquake","net":"us","tsunami":null,"sources":",us,","title":"M 4.6 - 35km NNW of Balkanabat, Turkmenistan","time":1391821880490,"updated":1391850827048,"mag":4.6,"types":",cap,dyfi,geoserve,nearby-cities,origin,phase-data,tectonic-summary,","place":"35km NNW of Balkanabat, Turkmenistan","status":"reviewed","ids":",usc000mksz,","alert":null,"rms":1.36,"code":"c000mksz","url":"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usc000mksz","magType":"mb","mmi":null,"cdi":null,"tz":300,"felt":null,"nst":null,"dmin":3.566,"gap":53,"sig":326}},{"id":"usc000mkir","type":"Feature","geometry":{"type":"Point","coordinates":[-72.9583,6.7107,157.61]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mkir.geojson","type":"earthquake","net":"us","tsunami":null,"sources":",us,","title":"M 5.4 - 7km ENE of Aratoca, Colombia","time":1391805430940,"updated":1391822811919,"mag":5.4,"types":",cap,dyfi,general-link,geoserve,losspager,nearby-cities,origin,phase-data,shakemap,tectonic-summary,","place":"7km ENE of Aratoca, Colombia","status":"reviewed","ids":",usc000mkir,","alert":"green","rms":0.86,"code":"c000mkir","url":"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usc000mkir","magType":"mb","mmi":4.02,"cdi":5,"tz":-300,"felt":151,"nst":null,"dmin":2.292,"gap":23,"sig":524}},{"id":"usc000mkes","type":"Feature","geometry":{"type":"Point","coordinates":[-179.784,-23.2075,544.06]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mkes.geojson","type":"earthquake","net":"us","tsunami":null,"sources":",us,","title":"M 4.8 - South of the Fiji Islands","time":1391797565060,"updated":1391826517121,"mag":4.8,"types":",cap,dyfi,geoserve,nearby-cities,origin,phase-data,tectonic-summary,","place":"South of the Fiji Islands","status":"reviewed","ids":",usc000mkes,","alert":null,"rms":0.94,"code":"c000mkes","url":"http:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/usc000mkes","magType":"mb","mmi":null,"cdi":null,"tz":-720,"felt":null,"nst":null,"dmin":5.8,"gap":111,"sig":354}},{"id":"usc000mkcq","type":"Feature","geometry":{"type":"Point","coordinates":[141.3575,37.607,63.17]},"properties":{"detail":"http:\/\/earthquake.usgs.gov\/earthquakes\/feed\/v1.0\/detail\/usc000mkcq.geojson","ty
02-08 04:24:26.508: W/System.err(2559):     at org.json.JSON.typeMismatch(JSON.java:111)
02-08 04:24:26.518: W/System.err(2559):     at org.json.JSONArray.<init>(JSONArray.java:96)
02-08 04:24:26.518: W/System.err(2559):     at org.json.JSONArray.<init>(JSONArray.java:108)
02-08 04:24:26.528: W/System.err(2559):     at com.googlemaps.Json.earthquake(Json.java:50)
02-08 04:24:26.528: W/System.err(2559):     at com.googlemaps.Json$Read.doInBackground(Json.java:66)
02-08 04:24:26.528: W/System.err(2559):     at com.googlemaps.Json$Read.doInBackground(Json.java:1)
02-08 04:24:26.548: W/System.err(2559):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
02-08 04:24:26.548: W/System.err(2559):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
02-08 04:24:26.548: W/System.err(2559):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
02-08 04:24:26.548: W/System.err(2559):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-08 04:24:26.558: W/System.err(2559):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-08 04:24:26.558: W/System.err(2559):     at java.lang.Thread.run(Thread.java:841)

02-08 04:23:58.908:I/编舞（2559）：跳过91帧！应用程序可能在其主线程上做了太多工作。
02-08 04:23:59.228:I/编舞（2559）：跳过了301帧！应用程序可能在其主线程上做了太多工作。
02-08 04:24:24.608:I/编舞（2559）：跳过77帧！应用程序可能在其主线程上做了太多工作。
02-08 04:24:26.398:D/dalvikvm（2559）：释放375K，14%释放3060K/3536K，暂停92ms，总计92ms
02-08 04:24:26.498:W/System.err（2559）：org.json.JSONException:Value{“features”：[{“id”：“usc000mkv5”，“type”：“Feature”，“geometry”：{“type”：“Point”，“coordinates”：[159.5419，-9.7067,41.51]，“properties”：{“detail”：“http:\/\/search.usgs.gov\/sequestions\/feed\/v1.0\/detail\/usc000mkv5.geojson”，“type”：“地震”，“net”：“us”，“海啸”：null，“资料来源”：“美国”，“标题”：“所罗门群岛霍尼亚拉西南5.1-54公里”，“时间”：1391838013570，“更新”：1391843853000，“mag”：5.1，“类型”：“cap、dyfi、地球观测、附近城市、起源、阶段数据、构造摘要”，“地点”：“所罗门群岛霍尼亚拉西南54公里”，“状态”：“已审查”，“ID”：“USC0000MKV5”，“警报”：null，“rms”：0.59，“代码”：“C000MV5”，“url”：http:\/\/sequence.usgs.gov\/sequences\/eventpage\/usc000mkv5，“magType”：“mb”，“mmi”：null，“cdi”：1，“tz”：660，“feel”：0，“nst”：null，“dmin”：9.404，“gap”：94，“sig”：400}，{“id”：“usc000mktr”，“type”：“Feature”，“geometry”：{“type”：“Point”，“座标”：[141.0819,37.092,54.23]}，“properties”：{“detail”：”http:\/\/sequence.usgs.gov\/sequences\/feed\/v1.0\/detail\/usc000mktr.geojson，“类型”：“地震”，“网络”：“美国”，“海啸”：空，“来源”：“美国”，“标题”：“日本磐城东北5.0-18km”，“时间”：1391826863590，“更新”：1391828049000，“mag”：5，“类型”：“cap，dyfi，通用链接，地球观测，附近城市，起源，阶段数据，构造概要”，“地点”：日本岩崎市东北18公里处，“状态”：“已审查”，“ids”：“USC0000MKTR”，“警报”：null，“rms”：0.72，“代码”：“c000mktr”，“url”：“http:\/\/sequence.usgs.gov\/sequences\/eventpage\/USC0000MKTR”，“magType”：“mb”，“mmi”：null，“cdi”：1，“tz”：540，“FEEL”：0，“nst”：null，“dmin”：2.369，“gap”：123，“sig”：385}，{“id”：“USC0000MKSZ”，“类型”：“特征”，“几何图形”：“点”坐标“[54.2342,39.8122,10.69]，“属性”：{“详细信息”：“http:\/\/sequence.usgs.gov\/sequences\/feed\/v1.0\/detail\/usc000mksz.geojson”，“类型”：“地震”，“网络”：“美国”，“海啸”：空，“来源”：“美国”，“美国”，“标题”：“土库曼斯坦巴尔干巴特北纬4.6-35公里”，“时间”：1391821880490，“更新”：1391850827048，“mag”：4.6，“类型”：，cap，dyfi，geoserve，附近城市，起源，阶段数据，构造概要，，“地点：”，“土库曼斯坦巴尔干阿巴特西北35公里，”，“状态：”，“已审查”，“ids:”，“USC0000MKSZ，”，“警报：”，“无效”，rms:“1.36”，代码：“：“C000MsZ”，“url:“http:\/\/地震.usgs.gov\/地震\/事件页\/USC0000MKSZ”，“magType:“mb”，“mmi:”，“无效”，cdi:“无效”，tz:“300”，“Feel:“无效”，nst:“无效”，dmin“：3.566，“gap”：53，“sig”：326}，{“id”：“usc000mkir”，“type”：“Feature”，“geometry”：{“type”：“Point”，“coordinates”：[-72.9583,6.7107157.61]，“properties”：{“detail”：“http:\/\/search.usgs.gov\/seasures\/feed\/v1.0\/detail\/usc000mkir.geojson”，“type”：“地震”，“net”：“us”：“us”，“海啸”：null，“sources”：“us”；“us”；“title”：“M 5.4-7km”
if (statusCode == 200){
     HttpEntity ent = response.getEntity();
     String data= EntityUtils.toString(ent);

     JSONObject main_obj = new JSONObject(data);
     JSONArray list = main_obj.getJSONArray("features");
     JSONObject latest = list.getJSONObject(0);
     JSONObject geometry_obj = latest.getJSONObject("geometry");

    return geometry_obj;
}

String re = "";
try {

    StringBuilder stringBuilder = new StringBuilder();
    json = earthquake("4.5_day.geojson");
    JSONArray coordinates_array = json.getJSONArray("coordinates");
    for(int i = 0; i < coordinates_array.length(); i++){
       stringBuilder.append(coordinates_array.getString(i)+",");
    }
    re = stringBuilder.toString();
    return re;
}