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Iam站在這個問題，我不知道。我有這個應用程序，它運行在Galaxy S3和Wildfire上，但是當我試圖在Galaxy S2上運行Iam時出現錯誤。 Galaxy S3運行4.1.2，Wilfire運行2.2.1和Galaxy S2運行2.3.3 Android操作系統。在對話框中的Android AsyncTask失敗
問題 有一個進度對話框，並停止和應用存在誤差下來，但我不明白像我的工作2設備上而不是在銀河S2之前提到的。這是從logcat的我 錯誤：
04-03 11:02:42.010: E/AndroidRuntime(12339): FATAL EXCEPTION: AsyncTask #1
04-03 11:02:42.010: E/AndroidRuntime(12339): java.lang.RuntimeException: An error occured while executing doInBackground()
04-03 11:02:42.010: E/AndroidRuntime(12339): at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.lang.Thread.run(Thread.java:1019)
04-03 11:02:42.010: E/AndroidRuntime(12339): Caused by: java.lang.NullPointerException
04-03 11:02:42.010: E/AndroidRuntime(12339): at dk.tankegang.skraldespand.AlleKommuner$LoadAllProducts.doInBackground(AlleKommuner.java:138)
04-03 11:02:42.010: E/AndroidRuntime(12339): at dk.tankegang.skraldespand.AlleKommuner$LoadAllProducts.doInBackground(AlleKommuner.java:1)
04-03 11:02:42.010: E/AndroidRuntime(12339): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-03 11:02:42.010: E/AndroidRuntime(12339): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-03 11:02:42.010: E/AndroidRuntime(12339): ... 4 more
04-03 11:02:46.975: E/WindowManager(12339): Activity dk.tankegang.skraldespand.AlleKommuner has leaked window [email protected] that was originally added here
04-03 11:02:46.975: E/WindowManager(12339): android.view.WindowLeaked: Activity dk.tankegang.skraldespand.AlleKommuner has leaked window [email protected] that was originally added here
04-03 11:02:46.975: E/WindowManager(12339): at android.view.ViewRoot.<init>(ViewRoot.java:266)
04-03 11:02:46.975: E/WindowManager(12339): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:174)
04-03 11:02:46.975: E/WindowManager(12339): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:117)
04-03 11:02:46.975: E/WindowManager(12339): at android.view.Window$LocalWindowManager.addView(Window.java:424)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.Dialog.show(Dialog.java:241)
04-03 11:02:46.975: E/WindowManager(12339): at dk.tankegang.skraldespand.AlleKommuner$LoadAllProducts.onPreExecute(AlleKommuner.java:126)
04-03 11:02:46.975: E/WindowManager(12339): at android.os.AsyncTask.execute(AsyncTask.java:391)
04-03 11:02:46.975: E/WindowManager(12339): at dk.tankegang.skraldespand.AlleKommuner.onCreate(AlleKommuner.java:63)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
04-03 11:02:46.975: E/WindowManager(12339): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 11:02:46.975: E/WindowManager(12339): at android.os.Looper.loop(Looper.java:123)
04-03 11:02:46.975: E/WindowManager(12339): at android.app.ActivityThread.main(ActivityThread.java:3691)
04-03 11:02:46.975: E/WindowManager(12339): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 11:02:46.975: E/WindowManager(12339): at java.lang.reflect.Method.invoke(Method.java:507)
04-03 11:02:46.975: E/WindowManager(12339): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
04-03 11:02:46.975: E/WindowManager(12339): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
04-03 11:02:46.975: E/WindowManager(12339): at dalvik.system.NativeStart.main(Native Method)
這是使用，類代碼IAM：
public class AlleKommuner extends ListActivity {
SQLiteDatabase db;
private ProgressDialog pDialog;
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> kommunerList;
private static String url_all_kommuner = "http://xxx.com";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_KOMMUNER = "kommuner";
private static final String TAG_KID = "kId";
private static final String TAG_KNAME = "kName";
private static final String TAG_KURL = "kUrl";
// products JSONArray
JSONArray kommuner = null;
String TAG = "LEYTH Alle Kommuner";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
kommunerList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
db = openOrCreateDatabase("value.db", Context.MODE_PRIVATE, null); // optional CursorFactory
String kUrl = ((TextView) view.findViewById(R.id.kUrl)).getText().toString();
Intent in = new Intent(getApplicationContext(), EnkeltView.class);
in.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
db.execSQL("INSERT INTO startValue (myValue, myUrl) VALUES (1, "+"'" + kUrl +"'"+")");
db.close();
finish();
startActivityForResult(in, 100);
}
});
((PullToRefreshListView) getListView()).setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
// Do work to refresh the list here.
new LoadAllProducts().execute();
Log.d(TAG, "Here iam 2");
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
class LoadAllProducts extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AlleKommuner.this);
pDialog.setMessage("Vent Venligst..");
pDialog.setTitle("Henter Kommuner");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_kommuner, "GET", params);
try {
// products found
// Getting Array of Products
kommuner = json.getJSONArray(TAG_KOMMUNER);
kommunerList.clear();
// looping through All Products
for (int i = 0; i < kommuner.length(); i++) {
JSONObject c = kommuner.getJSONObject(i);
// Storing each json item in variable
String k_id = c.getString(TAG_KID);
String k_name = c.getString(TAG_KNAME);
String k_url = c.getString(TAG_KURL);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_KID, k_id);
map.put(TAG_KNAME, k_name);
map.put(TAG_KURL, k_url);
Log.v(TAG, "this is kUrl --> ; " + k_url + " --- And this is TAG --> " + TAG_KURL);
// adding HashList to ArrayList
kommunerList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AlleKommuner.this, kommunerList,
R.layout.list_item, new String[] { TAG_KID,
TAG_KNAME, TAG_KURL},
new int[] { R.id.kId, R.id.name, R.id.kUrl });
// updating listview
setListAdapter(adapter);
}
});
((PullToRefreshListView) getListView()).onRefreshComplete();
}
}
什麼是第138行？ – njzk2
爲什麼你們不能閱讀堆棧跟蹤？什麼是AlleKommuner.java:138？ –
kommuner = json.getJSONArray（TAG_KOMMUNER）; – Tirolel