我对android编程还很陌生；我正在尝试排除故障并修复以下错误。该错误是由于FormMediaActivity错误导致的
08-11 16:40:00.480 5189-5189/org.odk.collect.android E/AndroidRuntime: FATAL EXCEPTION: main
Process: org.odk.collect.android, PID: 5189
java.lang.RuntimeException: Unable to start activity ComponentInfo{org.odk.collect.android/org.odk.collect.android.activities.FormMediaUpdatedList}: java.lang.ClassCastException: org.odk.collect.android.activities.FormMediaUpdatedList cannot be cast to android.widget.AdapterView$OnItemClickListener
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassCastException: org.odk.collect.android.activities.FormMediaUpdatedList cannot be cast to android.widget.AdapterView$OnItemClickListener
at org.odk.collect.android.activities.AppListActivity.setContentView(AppListActivity.java:127)
at org.odk.collect.android.activities.FormMediaUpdatedList.setContentView(FormMediaUpdatedList.java:64)
at org.odk.collect.android.activities.FormMediaUpdatedList.onCreate(FormMediaUpdatedList.java:115)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
此错误是我的android应用程序中的以下活动的结果：目的是下载新表单并显示过程对话框。我认为我的活动生命周期全错了，但是我不确定如何解决我的问题
public class FormMediaUpdatedList extends FormListActivity implements FormListDownloaderListener,
DownloadFormsTaskListener, AuthDialogUtility.AuthDialogUtilityResultListener{
private static final String FORM_DOWNLOAD_LIST_SORTING_ORDER = "formDownloadListSortingOrder";
private static final int PROGRESS_DIALOG = 1;
private static final int AUTH_DIALOG = 2;
private static final int CANCELLATION_DIALOG = 3;
private static final String BUNDLE_SELECTED_COUNT = "selectedcount";
private static final String BUNDLE_FORM_MAP = "formmap";
private static final String DIALOG_TITLE = "dialogtitle";
private static final String DIALOG_MSG = "dialogmsg";
private static final String DIALOG_SHOWING = "dialogshowing";
private static final String FORMLIST = "formlist";
private static final String SELECTED_FORMS = "selectedForms";
public static final String FORMNAME = "formname";
private static final String FORMDETAIL_KEY = "formdetailkey";
public static final String FORMID_DISPLAY = "formiddisplay";
public static final String FORM_ID_KEY = "formid";
private static final String FORM_VERSION_KEY = "formversion";
private String alertMsg;
private boolean alertShowing;
private String alertTitle;
private AlertDialog alertDialog;
private ProgressDialog progressDialog;
private ProgressDialog cancelDialog;
private DownloadFormListTask downloadFormListTask;
private DownloadFormsTask downloadFormsTask;
private HashMap<String, FormDetails> formNamesAndURLs = new HashMap<String, FormDetails>();
private ArrayList<HashMap<String, String>> formList;
private final ArrayList<HashMap<String, String>> filteredFormList = new ArrayList<>();
private LinkedHashSet<String> selectedForms = new LinkedHashSet<>();
private static final boolean EXIT = true;
private static final boolean DO_NOT_EXIT = false;
private boolean shouldExit;
private static final String SHOULD_EXIT = "shouldexit";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_menu);
setTitle(getString(R.string.getupdated_forms));
downloadUpdatedFiles();
}
/**
* Starts the download task and shows the progress dialog.
*/
private void downloadFormList() {
ConnectivityManager connectivityManager =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = connectivityManager.getActiveNetworkInfo();
if (ni == null || !ni.isConnected()) {
ToastUtils.showShortToast(R.string.no_connection);
} else {
formNamesAndURLs = new HashMap<String, FormDetails>();
if (progressDialog != null) {
// This is needed because onPrepareDialog() is broken in 1.6.
progressDialog.setMessage(getString(R.string.please_wait));
}
showDialog(PROGRESS_DIALOG);
if (downloadFormListTask != null
&& downloadFormListTask.getStatus() != AsyncTask.Status.FINISHED) {
return; // we are already doing the download!!!
} else if (downloadFormListTask != null) {
downloadFormListTask.setDownloaderListener(null);
downloadFormListTask.cancel(true);
downloadFormListTask = null;
}
downloadFormListTask = new DownloadFormListTask();
downloadFormListTask.setDownloaderListener(this);
downloadFormListTask.execute();
}
}
@Override
protected void onRestoreInstanceState(Bundle state) {
super.onRestoreInstanceState(state);
updateAdapter();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable(BUNDLE_FORM_MAP, formNamesAndURLs);
outState.putString(DIALOG_TITLE, alertTitle);
outState.putString(DIALOG_MSG, alertMsg);
outState.putBoolean(DIALOG_SHOWING, alertShowing);
outState.putBoolean(SHOULD_EXIT, shouldExit);
outState.putSerializable(FORMLIST, formList);
outState.putSerializable(SELECTED_FORMS, selectedForms);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case PROGRESS_DIALOG:
Collect.getInstance().getActivityLogger().logAction(this,
"onCreateDialog.PROGRESS_DIALOG", "show");
progressDialog = new ProgressDialog(this);
DialogInterface.OnClickListener loadingButtonListener =
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Collect.getInstance().getActivityLogger().logAction(this,
"onCreateDialog.PROGRESS_DIALOG", "OK");
// we use the same progress dialog for both
// so whatever isn't null is running
dialog.dismiss();
if (downloadFormListTask != null) {
downloadFormListTask.setDownloaderListener(null);
downloadFormListTask.cancel(true);
downloadFormListTask = null;
}
if (downloadFormsTask != null) {
showDialog(CANCELLATION_DIALOG);
downloadFormsTask.cancel(true);
}
}
};
progressDialog.setTitle(getString(R.string.downloading_data));
progressDialog.setMessage(alertMsg);
progressDialog.setIcon(android.R.drawable.ic_dialog_info);
progressDialog.setIndeterminate(true);
progressDialog.setCancelable(false);
progressDialog.setButton(getString(R.string.cancel), loadingButtonListener);
return progressDialog;
case AUTH_DIALOG:
Collect.getInstance().getActivityLogger().logAction(this,
"onCreateDialog.AUTH_DIALOG", "show");
alertShowing = false;
return new AuthDialogUtility().createDialog(this, this, null);
case CANCELLATION_DIALOG:
cancelDialog = new ProgressDialog(this);
cancelDialog.setTitle(getString(R.string.canceling));
cancelDialog.setMessage(getString(R.string.please_wait));
cancelDialog.setIcon(android.R.drawable.ic_dialog_info);
cancelDialog.setIndeterminate(true);
cancelDialog.setCancelable(false);
return cancelDialog;
}
return null;
}
@Override
protected String getSortingOrderKey() {
return FORM_DOWNLOAD_LIST_SORTING_ORDER;
}
@Override
protected void updateAdapter() {
CharSequence charSequence = getFilterText();
filteredFormList.clear();
if (charSequence.length() > 0) {
for (HashMap<String, String> form : formList) {
if (form.get(FORMNAME).toLowerCase(Locale.US).contains(charSequence.toString().toLowerCase(Locale.US))) {
filteredFormList.add(form);
}
}
} else {
filteredFormList.addAll(formList);
}
//sortList();
if (listView.getAdapter() == null) {
listView.setAdapter(new FormDownloadListAdapter(this, filteredFormList, formNamesAndURLs));
} else {
FormDownloadListAdapter formDownloadListAdapter = (FormDownloadListAdapter) listView.getAdapter();
formDownloadListAdapter.setFromIdsToDetails(formNamesAndURLs);
formDownloadListAdapter.notifyDataSetChanged();
}
}
/**
* starts the task to download the selected forms, also shows progress dialog
*/
private void downloadUpdatedFiles() {
downloadFormsTask = new DownloadFormsTask();
downloadFormsTask.setDownloaderListener(this);
}
@Override
public Object onRetainCustomNonConfigurationInstance() {
if (downloadFormsTask != null) {
return downloadFormsTask;
} else {
return downloadFormListTask;
}
}
@Override
protected void onDestroy() {
if (downloadFormListTask != null) {
downloadFormListTask.setDownloaderListener(null);
}
if (downloadFormsTask != null) {
downloadFormsTask.setDownloaderListener(null);
}
super.onDestroy();
}
@Override
protected void onResume() {
if (downloadFormListTask != null) {
downloadFormListTask.setDownloaderListener(this);
}
if (downloadFormsTask != null) {
downloadFormsTask.setDownloaderListener(this);
}
if (alertShowing) {
createAlertDialog(alertTitle, alertMsg, shouldExit);
}
super.onResume();
}
@Override
protected void onPause() {
if (alertDialog != null && alertDialog.isShowing()) {
alertDialog.dismiss();
}
super.onPause();
}
/*
* Called when the form list has finished downloading. results will either contain a set of
* <formname, formdetails> tuples, or one tuple of DL.ERROR.MSG and the associated message.
*/
public void formListDownloadingComplete(HashMap<String, FormDetails> result) {
dismissDialog(PROGRESS_DIALOG);
downloadFormListTask.setDownloaderListener(null);
downloadFormListTask = null;
if (result == null) {
Timber.e("Formlist Downloading returned null. That shouldn't happen");
// Just displayes "error occured" to the user, but this should never happen.
createAlertDialog(getString(R.string.load_remote_form_error),
getString(R.string.error_occured), EXIT);
return;
}
if (result.containsKey(DL_AUTH_REQUIRED)) {
// need authorization
showDialog(AUTH_DIALOG);
} else if (result.containsKey(DL_ERROR_MSG)) {
// Download failed
String dialogMessage =
getString(R.string.list_failed_with_error,
result.get(DL_ERROR_MSG).getErrorStr());
String dialogTitle = getString(R.string.load_remote_form_error);
createAlertDialog(dialogTitle, dialogMessage, DO_NOT_EXIT);
} else {
Toast.makeText(getBaseContext(), "Test out for an error" , Toast.LENGTH_SHORT ).show();
// selectSupersededForms();
}
}
/**
* Creates an alert dialog with the given tite and message. If shouldExit is set to true, the
* activity will exit when the user clicks "ok".
*/
private void createAlertDialog(String title, String message, final boolean shouldExit) {
Collect.getInstance().getActivityLogger().logAction(this, "createAlertDialog", "show");
alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
DialogInterface.OnClickListener quitListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
switch (i) {
case DialogInterface.BUTTON_POSITIVE: // ok
Collect.getInstance().getActivityLogger().logAction(this,
"createAlertDialog", "OK");
// just close the dialog
alertShowing = false;
// successful download, so quit
if (shouldExit) {
finish();
}
break;
}
}
};
alertDialog.setCancelable(false);
alertDialog.setButton(getString(R.string.ok), quitListener);
alertDialog.setIcon(android.R.drawable.ic_dialog_info);
alertMsg = message;
alertTitle = title;
alertShowing = true;
this.shouldExit = shouldExit;
alertDialog.show();
}
@Override
public void progressUpdate(String currentFile, int progress, int total) {
alertMsg = getString(R.string.fetching_file, currentFile, String.valueOf(progress), String.valueOf(total));
progressDialog.setMessage(alertMsg);
}
@Override
public void formsDownloadingComplete(HashMap<FormDetails, String> result) {
if (downloadFormsTask != null) {
downloadFormsTask.setDownloaderListener(null);
}
if (progressDialog.isShowing()) {
// should always be true here
progressDialog.dismiss();
}
createAlertDialog(getString(R.string.download_forms_result), getDownloadResultMessage(result), EXIT);
}
public static String getDownloadResultMessage(HashMap<FormDetails, String> result) {
Set<FormDetails> keys = result.keySet();
StringBuilder b = new StringBuilder();
for (FormDetails k : keys) {
b.append(k.getFormName() + " ("
+ ((k.getFormVersion() != null)
? (Collect.getInstance().getString(R.string.version) + ": " + k.getFormVersion() + " ")
: "") + "ID: " + k.getFormID() + ") - " + result.get(k));
b.append("\n\n");
}
return b.toString().trim();
}
@Override
public void formsDownloadingCancelled() {
if (downloadFormsTask != null) {
downloadFormsTask.setDownloaderListener(null);
downloadFormsTask = null;
}
if (cancelDialog.isShowing()) {
cancelDialog.dismiss();
}
}
@Override
public void updatedCredentials() {
downloadFormList();
}
@Override
public void cancelledUpdatingCredentials() {
finish();
}
}
有人可以帮我指出为什么我的活动引发错误吗？