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[英]FATAL EXCEPTION: AsyncTask #1 java.lang.RuntimeException: An error occured while executing doInBackground(), while sending an image to the Server
[英]FATAL EXCEPTION: AsyncTask #1 : java.lang.RuntimeException: An error occured while executing doInBackground()
在Android設備上構建代碼時出現錯誤。 錯誤報告
致命異常:AsyncTask#1進程:com.example.guntu,PID:1248 java.lang.RuntimeException:在Java上的android.os.AsyncTask $ 3.done(AsyncTask.java:304)執行doInBackground()時發生錯誤。 android上的util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)在java.util.concurrent.FutureTask.setException(FutureTask.java:222)在java.util.concurrent.FutureTask.run(FutureTask.java:242)在Android .os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:231)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java: 587)at java.lang.Thread.run(Thread.java:818)原因:java.lang.NullPointerException:嘗試調用虛擬方法'org.json.JSONArray org.json.JSONObject.getJSONArray(java.lang.String )''放在com.example.guntu.List $ DownloadJSON.doInBackground(List.java:49)上com.example.guntu.List $ DownloadJSON.doInBackground(List.java:74)上的空對象引用上。阿辛 cTask $ 2.call(AsyncTask.java:292)at java.util.concurrent.FutureTask.run(FutureTask.java:237)at android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:231)at java.util .concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:587)at java.lang.Thread.run(Thread.java:818)09-06 07:37:48.656 1248-1248 / com.example.guntu E / WindowManager:android.view.WindowLeaked:活動com.example.guntu.List泄漏了窗口com.android.internal.policy.impl.PhoneWindow $ DecorView {35557537 VE .... R ...... D 0,0-684,322},最初是在android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java :271),位於android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85),位於android.app.Dialog.show(Dialog.java:298),位於com.example.guntu.List $ DownloadJSON.onPreExecute(List.java: 62)在android.os.AsyncTask.executeOnExecutor(AsyncTask.java:591 )的android.os.AsyncTask.execute(AsyncTask.java:539)的com.example.guntu.List.onCreate(List.java:44)的android.app.Activity.performCreate(Activity.java:6033)的android .app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2288)在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2397)在android.app.ActivityThread在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1310)在android.os.Handler.dispatchMessage(Handler.java:102)處訪問$ 800(ActivityThread.java:151)在android.os.Looper.loop( Looper.java:135),位於android.app.ActivityThread.main(ActivityThread.java:5268),位於java.lang.reflect.Method.invoke(本機方法),位於java.lang.reflect.Method.invoke(Method.java: 372),位於com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:902),位於com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697)
這是我的代碼
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(List.this);
// Set progressdialog title
mProgressDialog.setTitle("Android JSON Parse Tutorial");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONFunction
.getJSONfromURL("http://localhost/atm_db/json/json.php");
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("nama_atm", jsonobject.getString("nama_atm"));
map.put("alamat", jsonobject.getString("alamat"));
map.put("latitude", jsonobject.getString("latitude"));
map.put("longtitude", jsonobject.getString("longtitude"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
看起來像jsonobject.getJSONArray("");
由於jsonobject為null的事實而拋出錯誤。
您將需要仔細檢查是否正在獲取數據,如果是,則返回該JSON數據的格式。
將DownloadJSON替換為以下代碼:
public class DownloadJSON extends AsyncTask<String ,Integer , JSONObject> {
DownloadJSON(){
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(List.this);
// Set progressdialog title
mProgressDialog.setTitle("Android JSON Parse Tutorial");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected JSONObject doInBackground(String... params) {
// Retrieve JSON Objects from the given URL address
jsonobject = JSONFunction.getJSONfromURL("http://localhost/atm_db/json/json.php");
return jsonobject;
}
@Override
protected void onPostExecute(JSONObject s) {
super.onPostExecute(s);
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("PUT KEY OF JSON HERE");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("nama_atm", jsonobject.getString("nama_atm"));
map.put("alamat", jsonobject.getString("alamat"));
map.put("latitude", jsonobject.getString("latitude"));
map.put("longtitude", jsonobject.getString("longtitude"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
}
注意 :
1。 從doInBackground()返回jsonobject之前,請確保您從提到的URL接收到有效的jsonobject。
2。 從jsonobject獲取jsonArray時,請使用array的鍵。
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