ここでの別のスレッドに関して、jsonからjson配列を取得しようとしています。次のファイルがあります。
地震.json
[{
"eqid": "マージ",
「マグニチュード」: 8.8,
"長さ": 142.369,
"src": "私たち",
"日時": "2011-03-11 04:46:23",
"深さ": 24.4,
「緯度」: 38.322
}、{
"eqid": "merge2",
「マグニチュード」: 8.6,
"lng": 93.0632,
"src": "私たち",
"日時": "2012-04-11 06:38:37",
"深さ": 22.9,
「緯度」: 2.311
}、{
"eqid": "2007hear",
「マグニチュード」: 8.4,
"lng": 101.3815,
"src": "私たち",
"日時": "2007-09-12 09:10:26",
"深さ": 30,
「緯度」: -4.5172
}、{
"eqid": "c00090da",
「マグニチュード」: 8.2,
"lng": 92.4522,
"src": "私たち",
"日時": "2012-04-11 08:43:09",
"深さ": 16.4,
「緯度」: 0.7731
}、{
"eqid": "2007aqbk",
「マグニチュード」: 8,
"長さ": 156.9567,
"src": "私たち",
"日時": "2007-04-01 18:39:56",
"深さ": 10,
「緯度」: -8.4528
}、{
"eqid": "2007hec6",
「マグニチュード」: 7.8,
"長さ": 100.9638,
"src": "私たち",
"日時": "2007-09-12 21:49:01",
"深さ": 10,
「緯度」: -2.5265
}、{
"eqid": "b000g7x7",
「マグニチュード」: 7.8,
"lng": 62.0532,
"src": "私たち",
"日時": "2013-04-16 08:44:20",
"深さ": 82,
「緯度」: 28.1069
}、{
"eqid": "a00043nx",
「マグニチュード」：7.7、
"lng": 100.1139,
"src": "私たち",
"datetime": "2010-10-25 12:42:22",
"深さ": 20.6,
「緯度」: -3.4841
}、{
"eqid": "2010utc5",
「マグニチュード」：7.7、
"lng": 97.1315,
"src": "私たち",
"datetime": "2010-04-06 20:15:02",
"深さ": 31,
「緯度」: 2.3602
}、{
"eqid": "2009mebz",
「マグニチュード」: 7.6,
"長さ": 99.9606,
"src": "私たち",
"日時": "2009-09-30 08:16:09",
"深さ": 80,
「緯度」: -0.7889
}]
MainActivity.java
package ayub.khosa.json_parsing;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import org.apache.http.client.ClientProtocolException;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class MainActivity extends ListActivity
{
String tag = "AYUB";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{ super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.listplaceholder);
Log.d(tag, "setContentView ");
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
JSONArray json = null;
try {
json = JSONfunctions.getJSONfromURL("http://192.168.0.104/earthquakes.json");
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Log.d(tag, "json object ");
try{
Collection<?> result = null;
JSONArray json1 = new JSONArray(result);
// // ...
for(int i=0;i<json.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = json1.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put("name", "Earthquake name:" + e.getString("eqid"));
map.put("magnitude", "Magnitude: " + e.getString("magnitude"));
mylist.add(map);
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.activity_main,
new String[] { "name", "magnitude" },
new int[] { R.id.item_title, R.id.item_subtitle });
setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Log.d(tag, "json object " + lv.getItemAtPosition(position));
Toast.makeText(MainActivity.this, "ID " + o.get("id")+" " + o.get("name") + o.get("magnitude")+".", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
JSONFunctions.java
package ayub.khosa.json_parsing;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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.json.JSONArray;
import org.json.JSONException;
public class JSONfunctions {
public static JSONArray getJSONfromURL(String url) throws ClientProtocolException, IOException, JSONException{
InputStream is = null;
String result = "";
JSONArray jArray = null;
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
is = entity.getContent();
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();
jArray = new JSONArray(result);
return jArray;
}
}
問題は、画面にデータが表示されず、警告のみが表示されることです。
09-21 12:09:26.225: W/ActivityManager(59): Launch timeout has expired, giving up wake lock!
09-21 12:09:26.500: W/ActivityManager(59): Activity idle timeout for HistoryRecord{43ee8ee8 ayub.khosa.json_parsing/.MainActivity}
アップデート ：
確かに、ウェブサーバーは気付かないうちにダウンしていました。これで、ブラウザで json が表示されますが、次のエラーが表示されます。
09-21 12:30:52.301: W/ActivityManager(59): Activity destroy timeout for HistoryRecord{43f44da0 ayub.khosa.json_parsing/.MainActivity}
09-21 12:30:57.449: I/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=ayub.khosa.json_parsing/.MainActivity }
09-21 12:30:57.609: I/ActivityManager(59): Start proc ayub.khosa.json_parsing for activity ayub.khosa.json_parsing/.MainActivity: pid=287 uid=10036 gids={3003}
09-21 12:30:58.179: D/AYUB(287): setContentView
09-21 12:30:58.339: D/AYUB(287): json object
09-21 12:30:58.339: D/AndroidRuntime(287): Shutting down VM
09-21 12:30:58.339: W/dalvikvm(287): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-21 12:30:58.349: E/AndroidRuntime(287): FATAL EXCEPTION: main
09-21 12:30:58.349: E/AndroidRuntime(287): java.lang.RuntimeException: Unable to start activity ComponentInfo{ayub.khosa.json_parsing/ayub.khosa.json_parsing.MainActivity}: java.lang.NullPointerException
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.os.Handler.dispatchMessage(Handler.java:99)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.os.Looper.loop(Looper.java:123)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-21 12:30:58.349: E/AndroidRuntime(287): at java.lang.reflect.Method.invokeNative(Native Method)
09-21 12:30:58.349: E/AndroidRuntime(287): at java.lang.reflect.Method.invoke(Method.java:521)
09-21 12:30:58.349: E/AndroidRuntime(287): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-21 12:30:58.349: E/AndroidRuntime(287): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-21 12:30:58.349: E/AndroidRuntime(287): at dalvik.system.NativeStart.main(Native Method)
09-21 12:30:58.349: E/AndroidRuntime(287): Caused by: java.lang.NullPointerException
09-21 12:30:58.349: E/AndroidRuntime(287): at java.util.ArrayList.addAll(ArrayList.java:193)
09-21 12:30:58.349: E/AndroidRuntime(287): at org.json.JSONArray.<init(JSONArray.java:70)
09-21 12:30:58.349: E/AndroidRuntime(287): at ayub.khosa.json_parsing.MainActivity.onCreate(MainActivity.java:58)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-21 12:30:58.349: E/AndroidRuntime(287): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-21 12:30:58.349: E/AndroidRuntime(287): ... 11 more
09-21 12:30:58.419: D/dalvikvm(287): GC_FOR_MALLOC freed 3711 objects / 261576 bytes in 67ms
09-21 12:30:58.429: W/ActivityManager(59): Force finishing activity ayub.khosa.json_parsing/.MainActivity
09-21 12:30:58.958: W/ActivityManager(59): Activity pause timeout for HistoryRecord{440757b8 ayub.khosa.json_parsing/.MainActivity}
09-21 12:31:02.689: I/Process(287): Sending signal. PID: 287 SIG: 9
09-21 12:31:02.709: I/ActivityManager(59): Process ayub.khosa.json_parsing (pid 287) has died.
09-21 12:31:02.729: W/InputManagerService(59): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@43e4ec30
09-21 12:31:09.089: W/ActivityManager(59): Activity destroy timeout for HistoryRecord{440757b8 ayub.khosa.json_parsing/.MainActivity}
UPDATE 2 - after Max edit suggestion
> 09-21 13:08:24.395: D/AYUB(272): setContentView
> 09-21 13:08:24.475: I/global(272): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.
> 09-21 13:08:24.475: W/System.err(272): org.json.JSONException: End of input at character 0 of
> 09-21 13:08:24.485: W/System.err(272): at org.json.JSONTokener.syntaxError(JSONTokener.java:446)
> 09-21 13:08:24.485: W/System.err(272): at org.json.JSONTokener.nextValue(JSONTokener.java:93)
> 09-21 13:08:24.495: W/System.err(272): at org.json.JSONArray.<init>(JSONArray.java:87)
> 09-21 13:08:24.495: W/System.err(272): at org.json.JSONArray.<init>(JSONArray.java:103)
> 09-21 13:08:24.495: W/System.err(272): at ayub.khosa.json_parsing.JSONfunctions.getJSONfromURL(JSONfunctions.java:41)
> 09-21 13:08:24.495: W/System.err(272): at ayub.khosa.json_parsing.MainActivity.onCreate(MainActivity.java:44)
> 09-21 13:08:24.495: W/System.err(272): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
> 09-21 13:08:24.495: W/System.err(272): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
> 09-21 13:08:24.495: W/System.err(272): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
> 09-21 13:08:24.495: W/System.err(272): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
> 09-21 13:08:24.495: W/System.err(272): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
> 09-21 13:08:24.495: W/System.err(272): at android.os.Handler.dispatchMessage(Handler.java:99)
> 09-21 13:08:24.495: W/System.err(272): at android.os.Looper.loop(Looper.java:123)
> 09-21 13:08:24.495: W/System.err(272): at android.app.ActivityThread.main(ActivityThread.java:4627)
> 09-21 13:08:24.495: W/System.err(272): at java.lang.reflect.Method.invokeNative(Native Method)
> 09-21 13:08:24.505: W/System.err(272): at java.lang.reflect.Method.invoke(Method.java:521)
> 09-21 13:08:24.505: W/System.err(272): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
> 09-21 13:08:24.505: W/System.err(272): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
> 09-21 13:08:24.505: W/System.err(272): at dalvik.system.NativeStart.main(Native Method)
> 09-21 13:08:24.505: D/AYUB(272): json object
> 09-21 13:08:24.505: D/AndroidRuntime(272): Shutting down VM
> 09-21 13:08:24.505: W/dalvikvm(272): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
> 09-21 13:08:24.515: E/AndroidRuntime(272): FATAL EXCEPTION: main
> 09-21 13:08:24.515: E/AndroidRuntime(272): java.lang.RuntimeException: Unable to start activity ComponentInfo{ayub.khosa.json_parsing/ayub.khosa.json_parsing.MainActivity}: java.lang.NullPointerException
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.os.Handler.dispatchMessage(Handler.java:99)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.os.Looper.loop(Looper.java:123)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread.main(ActivityThread.java:4627)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at java.lang.reflect.Method.invokeNative(Native Method)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at java.lang.reflect.Method.invoke(Method.java:521)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at dalvik.system.NativeStart.main(Native Method)
> 09-21 13:08:24.515: E/AndroidRuntime(272): Caused by: java.lang.NullPointerException
> 09-21 13:08:24.515: E/AndroidRuntime(272): at java.util.ArrayList.addAll(ArrayList.java:193)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at org.json.JSONArray.<init>(JSONArray.java:70)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at ayub.khosa.json_parsing.MainActivity.onCreate(MainActivity.java:58)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
> 09-21 13:08:24.515: E/AndroidRuntime(272): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
> 09-21 13:08:24.515: E/AndroidRuntime(272): ... 11 more
> 09-21 13:08:27.035: I/Process(272): Sending signal. PID: 272 SIG: 9