アプリがクラッシュし続け、logcat を見ると 2 つのエラー セットが表示され、アプリがクラッシュします。誰かが何が悪いのか、それを防ぐために何ができるのか教えてくれたら本当にありがたい.
07-27 11:05:53.647: E/AndroidRuntime(913): FATAL EXCEPTION: AsyncTask #2
07-27 10:36:54.139: E/AndroidRuntime(775): java.lang.RuntimeException: An error occured while executing doInBackground()
07-27 10:36:54.139: E/AndroidRuntime(775): at android.os.AsyncTask$3.done(AsyncTask.java:299)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
07-27 10:36:54.139: E/AndroidRuntime(775): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.lang.Thread.run(Thread.java:856)
07-27 10:36:54.139: E/AndroidRuntime(775): Caused by: java.lang.NullPointerException
07-27 10:36:54.139: E/AndroidRuntime(775): at com.theproblemsolver.ListView$LoadAllData.doInBackground(ListView.java:92)
07-27 10:36:54.139: E/AndroidRuntime(775): at com.theproblemsolver.ListView$LoadAllData.doInBackground(ListView.java:1)
07-27 10:36:54.139: E/AndroidRuntime(775): at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-27 10:36:54.139: E/AndroidRuntime(775): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-27 10:36:54.139: E/AndroidRuntime(775): ... 4 more
これは、私のlogcatが私に与えている他のエラーです...
theproblemsolver.ListView has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d0e800 V.E..... R.....ID 0,0-234,72} that was originally added here
07-27 11:05:56.119: E/WindowManager(913): android.view.WindowLeaked: Activity com.theproblemsolver.ListView has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d0e800 V.E..... R.....ID 0,0-234,72} that was originally added here
07-27 11:05:56.119: E/WindowManager(913): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
07-27 11:05:56.119: E/WindowManager(913): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
07-27 11:05:56.119: E/WindowManager(913): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
07-27 11:05:56.119: E/WindowManager(913): at android.app.Dialog.show(Dialog.java:281)
07-27 11:05:56.119: E/WindowManager(913): at com.theproblemsolver.ListView$LoadAllData.onPreExecute(ListView.java:85)
07-27 11:05:56.119: E/WindowManager(913): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
07-27 11:05:56.119: E/WindowManager(913): at android.os.AsyncTask.execute(AsyncTask.java:534)
07-27 11:05:56.119: E/WindowManager(913): at com.theproblemsolver.ListView.onCreate(ListView.java:52)
07-27 11:05:56.119: E/WindowManager(913): at android.app.Activity.performCreate(Activity.java:5104)
07-27 11:05:56.119: E/WindowManager(913): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
27 11:05:56.119: E/WindowManager(913): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
07-27 11:05:56.119: E/WindowManager(913): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-27 11:05:56.119: E/WindowManager(913): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-27 11:05:56.119: E/WindowManager(913): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-27 11:05:56.119: E/WindowManager(913): at android.os.Handler.dispatchMessage(Handler.java:99)
07-27 11:05:56.119: E/WindowManager(913): at android.os.Looper.loop(Looper.java:137)
07-27 11:05:56.119: E/WindowManager(913): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-27 11:05:56.119: E/WindowManager(913): at java.lang.reflect.Method.invokeNative(Native Method)
07-27 11:05:56.119: E/WindowManager(913): at java.lang.reflect.Method.invoke(Method.java:511)
07-27 11:05:56.119: E/WindowManager(913): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-27 11:05:56.119: E/WindowManager(913): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-27 11:05:56.119: E/WindowManager(913): at dalvik.system.NativeStart.main(Native Method
主な活動
public class MainActivity extends Activity {
EditText et;
Button getanswer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button getanswer = (Button) findViewById(R.id.button1);
getanswer.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this, ListView.class);
startActivity(i);
}
});
}
}
ListView アクティビティ
public class ListView extends ListActivity {
private ProgressDialog pDialog;
JSONParsser jParser = new JSONParsser();
ArrayList<HashMap<String, String>> questionList;
private static String URI = "http://example.com/json";;
//JSONObject json = jParser.getJSONFromURI(URI);
final String TAG_RESULTS = "ResultsSet";
final String TAG_SUBJECT = "Subject";
final String TAG_NUMANSWERS = "NumAnswers";
final String TAG_QUESTION = "Question";
final String TAG_QUESTION_CONTENT = "Content";
final String TAG_QUESTION_CHOSENANSWER = "ChosenAnswer";
final String TAG_QUESTION_ANSWERS = "Answers";
JSONArray ResultsSet = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.listview);
questionList = new ArrayList<HashMap<String, String>>();
android.widget.ListView lv = getListView();
new LoadAllData().execute();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 100) {
Intent intent = getIntent();
startActivity(intent);
finish();
}
}
class LoadAllData extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ListView.this);
pDialog.setMessage("Loading Data. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
try {
JSONObject json = jParser.getJSONFromURI(URI);
ResultsSet = json.getJSONArray(TAG_RESULTS);
for(int i = 0; i < ResultsSet.length(); i++) {
JSONObject r = ResultsSet.getJSONObject(i);
String Subject = r.getString(TAG_SUBJECT);
String NumAnswers = r.getString(TAG_NUMANSWERS);
JSONObject Question = r.getJSONObject(TAG_QUESTION);
String Content = Question.getString(TAG_QUESTION_CONTENT);
String ChosenAnswer = Question.getString(TAG_QUESTION_CHOSENANSWER);
String Answers = Question.getString(TAG_QUESTION_ANSWERS);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_SUBJECT, Subject);
map.put(TAG_NUMANSWERS, NumAnswers);
questionList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_URI) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(getBaseContext(), questionList,
R.layout.row,
new String[] { TAG_SUBJECT, TAG_NUMANSWERS }, new int[] {
R.id.Subject, R.id.NumAnswers });
setListAdapter(adapter);
}
});
}
}}
JSONObject json = jParser.getJSONFromURI(URI);これは、メソッドを含む私の JSONParsser クラスです
public class JSONParsser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
EditText et;
public JSONParsser () {
}
public JSONObject getJSONFromURI(String URI) {
try{
HttpClient client = new DefaultHttpClient();
try {
URI website = new URI("http://example.com/json");
HttpGet request = new HttpGet();
request.setURI(website);
try {
HttpResponse response = client.execute(request);
HttpEntity httpEntity = response.getEntity();
is = httpEntity.getContent();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jObj;
}finally{}
}{
}
}