点击取消按钮后，我遇到硬盘故障，请看logcat。行ChartingFragment.java:617是dialog.dismiss();我不太确定为什么它说空或无法找到那里的对话框。有人看到我在这里失踪了吗？
public class WebPageAsync extends AsyncTask<Void, Integer, Void>{
ProgressBar progressBar;
TextView tvLoading, tvPer;
Dialog dialog;
Button btnCancel;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new Dialog(getActivity());
dialog.setCancelable(false);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.progressdialog);
progressBar = (ProgressBar) dialog.findViewById(R.id.progressBar1);
tvLoading = (TextView) dialog.findViewById(R.id.tv1);
tvPer = (TextView) dialog.findViewById(R.id.tvper);
btnCancel = (Button) dialog.findViewById(R.id.btncancel);
btnCancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
objMyTask.cancel(true);
dialog.dismiss();
}
});
dialog.show();
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
progressBar.setProgress(values[0]);
tvLoading.setText("Uploading... " + values[0] + " %");
tvPer.setText(values[0]+" %");
}
@Override
protected Void doInBackground(Void... params) {
String userID = null;
Log.i("PROJECTCARUSO","Fetching User/Posting User");
userID = postUser();
Log.i("PROJECTCARUSO","Fetching Charting/Posting Charting");
if (userID != null) {
postCharting();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
dialog.dismiss();
AlertDialog alert = new AlertDialog.Builder(getActivity())
.create();
alert.setTitle("Completed!!!");
alert.setMessage("Your Task is Completed SuccessFully!!!");
alert.setButton("Dismiss", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alert.show();
}
protected void postCharting() {
// Get the data
int percent = 0;
Cursor cursorCharting = getActivity().getContentResolver().query(StatusProvider.CONTENT_URI_CHARTING, null, StatusData.KEY_CHARTING_PROC + " is null " , null, null);
cursorCharting.moveToFirst();
if (cursorCharting.getCount()>0 && cursorCharting!=null) {
Log.i("PROJECTCARUSO","Que'd Charting Information Found");
while (cursorCharting.isAfterLast() == false)
{
if (isCancelled()) {
break;
}
percent += 100/cursorCharting.getCount();
Log.i("PROJECTCARUSO","percent: " + percent);
publishProgress(percent);
ArrayList<NameValuePair> httpParams;
httpParams = new ArrayList<NameValuePair>();
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_DATE, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_DATE))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_TEMPERATURE, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_TEMPERATURE))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_STAMPS, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_STAMPS))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_FERTILE, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_FERTILE))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_PERIOD, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_PERIOD))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_INTERCORSE, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_INTERCORSE))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_CERVIX, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_CERVIX))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_MOOD, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_MOOD))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_HEADACHE, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_HEADACHE))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_TEST, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_TEST))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_ENERGY, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_ENERGY))));
httpParams.add(new BasicNameValuePair(StatusData.KEY_CHARTING_NOTES, cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_NOTES))));
try {
SERVICE_URL = new URL("http://www.projectcaruso.com/android/com.projectcaruso/naturalfamilyplaning/postCharting.php");
} catch (MalformedURLException e) {
Log.i("PROJECTCARUSO", "MalformedURLException: " + e.toString());
e.printStackTrace();
}
String response= doPost(SERVICE_URL, httpParams);
// First split the input String into an array,
// each element containing a String to be parse as an int
String[] intsToParse = response.split("\"");
int[] info = new int[intsToParse.length];
int _id = 0;
// Now just parse each part in turn
for (int i = 0; i < info.length; i++)
{
if (isNumeric(intsToParse[i].toString())) {
_id = Integer.parseInt(intsToParse[i]);
}
}
if (_id >= 0) {
Log.i("PROJECTCARUSO", "Insert Successful: " + _id);
ContentValues values = new ContentValues();
values.put(StatusData.KEY_CHARTING_PROC, "Y");
getActivity().getContentResolver().update(StatusProvider.CONTENT_URI_CHARTING, values, " " + StatusData.KEY_CHARTING_DATE + " = " + cursorCharting.getString(cursorCharting.getColumnIndex(StatusData.KEY_CHARTING_DATE)), null);
}
cursorCharting.moveToNext();
}
} else {
Log.i("PROJECTCARUSO","No que'd Charting Information Found");
}
}
protected String postUser() {
String userID = null;
//Get the user
Cursor cursorUser = getActivity().getContentResolver().query(StatusProvider.CONTENT_URI_USER, null, null, null, null);
cursorUser.moveToFirst();
if (cursorUser.getCount()>0 && cursorUser!=null) {
// Record found
if (cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_ID)) == null) {
Log.i("PROJECTCARUSO","KEY_USER_ID is null, need to upload the user information");
//this user has logged in with facebook but has not be synced before.
//Push user information to my online database.
ArrayList<NameValuePair> httpParams;
httpParams = new ArrayList<NameValuePair>();
httpParams.add(new BasicNameValuePair("fbid", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_ROWID))));
httpParams.add(new BasicNameValuePair("social", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_SOCIAL))));
httpParams.add(new BasicNameValuePair("name", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_NAME))));
httpParams.add(new BasicNameValuePair("fname", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_FNAME))));
httpParams.add(new BasicNameValuePair("username", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_USERNAME))));
httpParams.add(new BasicNameValuePair("email", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_EMAIL))));
httpParams.add(new BasicNameValuePair("picture", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_PICTURE))));
httpParams.add(new BasicNameValuePair("other", cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_OTHER))));
try {
SERVICE_URL = new URL("http://www.projectcaruso.com/android/com.projectcaruso/naturalfamilyplaning/postUser.php");
} catch (MalformedURLException e) {
Log.i("PROJECTCARUSO", "MalformedURLException: " + e.toString());
e.printStackTrace();
}
String response = doPost(SERVICE_URL, httpParams);
// First split the input String into an array,
// each element containing a String to be parse as an int
String[] intsToParse = response.split("\"");
int[] info = new int[intsToParse.length];
int _id = 0;
// Now just parse each part in turn
for (int i = 0; i < info.length; i++)
{
if (isNumeric(intsToParse[i].toString())) {
_id = Integer.parseInt(intsToParse[i]);
}
}
if (_id > 0) {
Log.i("PROJECTCARUSO", "Found id: " + _id);
ContentValues values = new ContentValues();
values.put(StatusData.KEY_USER_ID, _id);
getActivity().getContentResolver().update(StatusProvider.CONTENT_URI_USER, values, " 1 = 1 ", null);
Cursor cursorUser2 = getActivity().getContentResolver().query(StatusProvider.CONTENT_URI_USER, null, null, null, null);
cursorUser2.moveToFirst();
userID = cursorUser2.getString(cursorUser2.getColumnIndex(StatusData.KEY_USER_ID));
}
} else {
while (cursorUser.isAfterLast() == false)
{
//this User is already set up to send/receive charting updates
Log.i("PROJECTCARUSO","User found and has been connected before");
userID = cursorUser.getString(cursorUser.getColumnIndex(StatusData.KEY_USER_ID));
cursorUser.moveToNext();
}
}
} else {
//This user has not been set up to send/receive charting updates
Log.i("PROJECTCARUSO","User profile not set up, please login via facebook");
Log.i("PROJECTCARUSO", "userID: " + userID);
}
return userID;
}
protected String doPost(URL url,ArrayList<NameValuePair> httpParams) {
String response = null;
try {
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getQuery(httpParams));
writer.close();
os.close();
conn.connect();
//start listening to the stream
Scanner inStream = new Scanner(conn.getInputStream());
//process the stream and store it in StringBuilder
while(inStream.hasNextLine())
response+=(inStream.nextLine());
Log.i("PROJECTCARUSO","response: " + response);
} catch (ProtocolException e) {
Log.i("PROJECTCARUSO", "Error: " + e.toString());
}
catch (IOException e) {
Log.i("PROJECTCARUSO", e.toString());
}
return response;
}
public boolean isNumeric(String str) {
try
{
double d = Double.parseDouble(str);
}
catch(NumberFormatException nfe)
{
return false;
}
return true;
}
private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
StringBuilder result = new StringBuilder();
boolean first = true;
for (NameValuePair pair : params)
{
if (pair.getValue() == null) {
Log.i("PROJECTCARUSO", "Null value pair for: " + pair.getName());
} else {
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
}
}
return result.toString();
}
logcat的：
08-05 09:54:45.182: E/AndroidRuntime(317): FATAL EXCEPTION: main
08-05 09:54:45.182: E/AndroidRuntime(317): java.lang.NullPointerException
08-05 09:54:45.182: E/AndroidRuntime(317): at com.projectcaruso.naturalfamilyplaning.ChartingFragment$WebPageAsync$1.onClick(ChartingFragment.java:617)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.view.View.performClick(View.java:4192)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.view.View$PerformClick.run(View.java:17254)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.os.Handler.handleCallback(Handler.java:615)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.os.Handler.dispatchMessage(Handler.java:92)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.os.Looper.loop(Looper.java:137)
08-05 09:54:45.182: E/AndroidRuntime(317): at android.app.ActivityThread.main(ActivityThread.java:4950)
08-05 09:54:45.182: E/AndroidRuntime(317): at java.lang.reflect.Method.invokeNative(Native Method)
08-05 09:54:45.182: E/AndroidRuntime(317): at java.lang.reflect.Method.invoke(Method.java:511)
08-05 09:54:45.182: E/AndroidRuntime(317): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
08-05 09:54:45.182: E/AndroidRuntime(317): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
08-05 09:54:45.182: E/AndroidRuntime(317): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：1)
什么是objMyTask？我认为这是触发null的{{1}}。
如果NullPointerException是objMyTask的实例，我强烈建议您使用WebPageAsync代替WebPageAsync.this.cancel(true)。