URLからjsonオブジェクトを取得するアプリを作成しようとしています。これは、json オブジェクトを読み込んで解析するはずのアクティビティでクラッシュし続けるため、不必要にイライラすることがわかっています。「残念ながら、(AppName)は停止しました」というメッセージが表示されます。その後、アプリケーションを終了します。JSON からのデータが画面に表示されることはありません。アクティビティと JSON 解析を含むコードを次に示します。
package com.example.Accomplist;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.RemoteException;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
/**
* Created with IntelliJ IDEA.
* User: DESAI_628IL
* Date: 3/1/13
* Time: 7:34 PM
* To change this template use File | Settings | File Templates.
*/
public class MainScreen extends Activity{
TextView myTextView;
// HttpClient client;
// url to make request
final static String url = "http://accomplist.herokuapp.com/api/v1/sharedevent/2/?format=json";
private static final String TAG_EVENT="event"; //A JSON object within the JSON object that will be returned by JSONParse()
private static final String TAG_DESCRIPTION="description"; //A JSON tag within the JSON object EVENT
private static String eventString="Yo";
static JSONObject json;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_screen);
new JSONParse().execute(url);
}
private class JSONParse extends AsyncTask<String, String, String> {
HttpClient client;
JSONObject jsonObj= null;
@Override
protected String doInBackground(String... jsonurl) {
StringBuilder url= new StringBuilder(String.valueOf(jsonurl));
HttpGet get= new HttpGet(url.toString());
HttpResponse r= null;
try {
r = client.execute(get);
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
int status= r.getStatusLine().getStatusCode();
if (status==200){
HttpEntity e=r.getEntity();
String data= null;
try {
data = EntityUtils.toString(e);
} catch (IOException e1) {
e1.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
try {
jsonObj = new JSONObject(data);
} catch (JSONException e1) {
e1.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
try {
JSONObject eventJson= jsonObj.getJSONObject(TAG_EVENT);
eventString= eventJson.getString(TAG_DESCRIPTION);
}
catch (JSONException e1) {
eventString="Couldn't Parse Data";
}
return eventString;
}
else{
return eventString;
}
}
protected void onProgressUpdate(String... progress) {
Toast loadingToast= Toast.makeText(getApplicationContext(), "Loading", Toast.LENGTH_LONG);
loadingToast.show();
}
protected void onPostExecute(String result) {
eventString=result;
myTextView = (TextView)findViewById(R.id.textView1);
myTextView.setText(eventString);
}
}
}
誰かが助けてくれることを願っています。私はこれに最も長い間立ち往生しています。私は多くのことを試しました。URL から JSON オブジェクトを取得するさまざまな方法、解析コードを別のクラスに配置する方法、その他多くの小さなことを試しました。どんな助けでも大歓迎です。LogCat エラー レポートは次のとおりです。
02-26 12:18:46.691: ERROR/ThrottleService(324): problem during onPollAlarm: java.lang.IllegalStateException: problem parsing stats: java.io.FileNotFoundException: /proc/net/xt_qtaguid/iface_stat_all: open failed: ENOENT (No such file or directory)
02-26 12:19:53.601: WARN/dalvikvm(4073): threadid=11: thread exiting with uncaught exception (group=0x40a71930)
02-26 12:19:55.121: WARN/dalvikvm(4073): threadid=12: thread exiting with uncaught exception (group=0x40a71930)
02-26 12:19:57.632: WARN/InputMethodManagerService(324): Got RemoteException sending setActive(false) notification to pid 4073 uid 10048
02-26 12:20:03.452: WARN/dalvikvm(4094): threadid=11: thread exiting with uncaught exception (group=0x40a71930)
02-26 12:20:04.744: ERROR/AndroidRuntime(4094): FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.IllegalArgumentException: Illegal character in path at index 0: [Ljava.lang.String;@40d12070
at java.net.URI.create(URI.java:727)
at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
at com.example.Accomplist.MainScreen$JSONParse.doInBackground(MainScreen.java:84)
at com.example.Accomplist.MainScreen$JSONParse.doInBackground(MainScreen.java:78)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
... 4 more
02-26 12:20:10.512: WARN/InputMethodManagerService(324): Got RemoteException sending setActive(false) notification to pid 4094 uid 10048
02-26 12:20:24.401: WARN/dalvikvm(4111): threadid=11: thread exiting with uncaught exception (group=0x40a71930)
02-26 12:20:24.441: ERROR/AndroidRuntime(4111): FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
at java.util.concurrent.FutureTask.run(FutureTask.java:239)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.IllegalArgumentException: Illegal character in path at index 0: [Ljava.lang.String;@40d12038
at java.net.URI.create(URI.java:727)
at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
at com.example.Accomplist.MainScreen$JSONParse.doInBackground(MainScreen.java:84)
at com.example.Accomplist.MainScreen$JSONParse.doInBackground(MainScreen.java:78)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
... 4 more
02-26 12:20:29.411: WARN/InputMethodManagerService(324): Got RemoteException sending setActive(false) notification to pid 4111 uid 10048