Attempt to invoke virtual method java lang string android content context getpackagename

Попытка вызвать виртуальный метод ‘java.lang.String android.content.Context.getPackageName ()’ при ошибке ссылки на пустой объект

Я пытаюсь получить уведомление для срабатывания, когда длинная ниже определенного числа. Однако всякий раз, когда вызывается sendNotification (), он выдает вышеуказанную ошибку.

Ниже приведен раздел кода, где проблема.

Я не уверен, что является причиной этой ошибки. Я подозреваю, что мне нужно изменить метод отправки уведомлений (представление View), но что в таком случае я должен отправлять как представление?

Я могу предоставить полный код, если это необходимо.

package com.mple.seriestracker; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.NotificationCompat; import com.mple.seriestracker.activity.HomeScreenActivity; import com.mple.seriestracker.api.episodate.entities.show.Episode; import com.mple.seriestracker.util.NotificationGenerator; import org.threeten.bp.Duration; import org.threeten.bp.LocalDateTime; import org.threeten.bp.OffsetDateTime; import org.threeten.bp.ZoneId; import org.threeten.bp.ZoneOffset; import org.threeten.bp.ZonedDateTime; import org.threeten.bp.format.DateTimeFormatter; import java.util.Locale; public class Countdown extends AppCompatActivity < private int season; private int episode; private String name; private ZonedDateTime airDate; private Context context; public Countdown(String name, int episode,int season,ZonedDateTime airDate, Context context)< this.airDate = airDate; this.name = name; this.episode = episode; this.season = season; this.context = context; >public Countdown(com.mple.seriestracker.api.episodate.entities.show.Countdown countdown) < this.airDate = parseToLocal(countdown.air_date); this.name = countdown.name; this.episode = countdown.episode; this.season = countdown.season; >public void getSecondsTillAiring() < Duration duration = Duration.between(LocalDateTime.now(),airDate); long days = duration.toDays(); //No idea why this returns an absurd number, possibly something wrong with the time conversion //So the simple fix is to convert the days into hours, subtract the total hours with the days. //This returns the real value, and makes it accurate. long hours = duration.toHours()-(days*24); long minutes = (int) ((duration.getSeconds() % (60 * 60)) / 60); long seconds = (int) (duration.getSeconds() % 60); if(days >0) < hours += days * 24; >if(hours > 0) < minutes += 60* hours; >if(minutes > 0) < seconds += 60 * minutes; >if (seconds < 432000)< sendNotification(); >> public void sendNotification() < NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "M_CH_ID"); //Create the intent that’ll fire when the user taps the notification// Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.androidauthority.com/")); PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0); notificationBuilder.setContentIntent(pendingIntent); NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); NotificationChannel notificationChannel = new NotificationChannel("M_CH_ID", "M_CH_ID", NotificationManager.IMPORTANCE_DEFAULT); notificationChannel.setDescription("Test"); nm.createNotificationChannel(notificationChannel); notificationBuilder.setAutoCancel(true) .setDefaults(Notification.DEFAULT_ALL) .setWhen(System.currentTimeMillis()) .setSmallIcon(R.drawable.ic_launcher) .setTicker("Hearty365") .setContentTitle("Default notification") .setContentText("Random words") .setContentInfo("Info"); nm.notify(1, notificationBuilder.build()); >public String getCountdownFormat() < getSecondsTillAiring(); Duration duration = Duration.between(LocalDateTime.now(),airDate); long days = duration.toDays(); //No idea why this returns an absurd number, possibly something wrong with the time conversion //So the simple fix is to convert the days into hours, subtract the total hours with the days. //This returns the real value, and makes it accurate. long hours = duration.toHours()-(days*24); int minutes = (int) ((duration.getSeconds() % (60 * 60)) / 60); int seconds = (int) (duration.getSeconds() % 60); String timeString = ""; if(days >0) < timeString+=formatDay(days); >if(hours > 0) < timeString+=formatHour(hours); >if(minutes > 0) < timeString+= formatMinutes(minutes); >if(seconds > 0) < timeString += formatSeconds(seconds); >return timeString; > public String getName() < return name; >public int getEpisode() < return episode; >public int getSeason() < return season; >private String formatDay(long days) < return format(days,"day"); >private String formatHour(long hours) < return format(hours,"hour"); >private String formatMinutes(long minutes) < return format(minutes,"minute"); >private String formatSeconds(long seconds) < return format(seconds,"second"); >private String format(long x,String nonPlural) < //Checks whether or not a plural should be added String string = nonPlural; if(x >1) string+="s"; return String.format("%s %s ",x,string); > //All air dates are formatted in this format static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH); public static ZonedDateTime parseToLocal(String s) < if(s == null) return null; return LocalDateTime.parse(s, DATE_TIME_FORMATTER) .atOffset(ZoneOffset.UTC) .atZoneSameInstant(ZoneId.systemDefault()); >public static boolean isOlderEpisode(LocalDateTime airDate, LocalDateTime currEpDate) < return currEpDate.isBefore(airDate); >public static boolean isOlderEpisode(OffsetDateTime airDate, OffsetDateTime currEpDate) < return currEpDate.toLocalDate().isBefore(airDate.toLocalDate()); >//Responsible for finding a certain episode public Countdown getUpcomingAiringEp(Episode[] episodes, int episode, int season) < if (episodes == null) < return null; >//Loop in reverse, since the episodes are ordered from start to finish //So looping from reverse will start with the newer shows first for (int i = (episodes.length - 1); i >= 0; i--) < Episode newEpisode = episodes[i]; if (newEpisode.air_date != null && newEpisode.season == season && newEpisode.episode == episode) < return new Countdown(newEpisode.name,newEpisode.episode, newEpisode.season, parseToLocal(newEpisode.air_date),this); >if(newEpisode.season > return null; > > 

Трассировка полного стека

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.mple.seriestracker, PID: 2348 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference at android.content.ContextWrapper.getPackageName(ContextWrapper.java:145) at android.app.PendingIntent.getActivity(PendingIntent.java:344) at android.app.PendingIntent.getActivity(PendingIntent.java:311) at com.mple.seriestracker.Countdown.sendNotification(Countdown.java:76) at com.mple.seriestracker.Countdown.getSecondsTillAiring(Countdown.java:65) at com.mple.seriestracker.Countdown.getCountdownFormat(Countdown.java:100) at com.mple.seriestracker.fragments.CountdownFragment$RecyclerViewAdapter$1.run(CountdownFragment.java:95) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

package com.mple.seriestracker.activity; import android.Manifest; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.view.View; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.NotificationCompat; import androidx.core.content.ContextCompat; import androidx.viewpager.widget.ViewPager; import com.google.android.material.floatingactionbutton.FloatingActionButton; import com.google.android.material.tabs.TabLayout; import com.jakewharton.threetenabp.AndroidThreeTen; import com.mple.seriestracker.R; import com.mple.seriestracker.ShowInfo; import com.mple.seriestracker.ShowTracker; import com.mple.seriestracker.TvShow; import com.mple.seriestracker.api.episodate.Episodate; import com.mple.seriestracker.api.episodate.entities.show.TvShowResult; import com.mple.seriestracker.database.EpisodeTrackDatabase; import com.mple.seriestracker.fragments.CountdownFragment; import com.mple.seriestracker.fragments.SectionsPagerAdapter; import com.mple.seriestracker.fragments.MyShowsFragment; import com.mple.seriestracker.util.NotificationGenerator; import java.io.IOException; import java.util.ArrayList; import java.util.List; import retrofit2.Response; public class HomeScreenActivity extends AppCompatActivity < static final int NEW_SHOW_REQUEST_CODE = 1; static final int FILE_PERMISSION_RREQUEST_CODE = 1; static final int NEW_SHOW_REQUEST_RESULT_CODE = 1; Context context = this; SectionsPagerAdapter mSectionsPagerAdapter; ViewPager mViewPager; TabLayout mTabs; boolean started = false; //TODO allow more than 3 shows to display on countdown page //TODO sort the countdown tab based on time //TODO notify the user when a show is airing //TODO re-obtain the next countdown (if any new episodes) otherwise remove the countdown from the tab //TODO add delete button to delete shows (holding on image already has checkboxes implemented) //All done after that @Override protected void onCreate(Bundle savedInstanceState) < super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EpisodeTrackDatabase.setInstance(new EpisodeTrackDatabase(getApplicationContext())); //Sets all date time stuff to correct sync AndroidThreeTen.init(this); //Initialize fragments mSectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager()); mViewPager = findViewById(R.id.view_pager); setupViewPager(mViewPager); mTabs = findViewById(R.id.tabs); mTabs.setupWithViewPager(mViewPager); //Initialize floating menu button FloatingActionButton fab = findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() < @Override public void onClick(View view) < startSearchIntent(); >>); > @Override protected void onStart() < super.onStart(); //On start is called when the search intent is destroyed //This prevents it from being used more than once. //As it's intended for loading settings only (after all UI elements are initialized) if(started) return; loadSettings(); started = true; >//Responsible for setting up the fragments for each tab private void setupViewPager(ViewPager viewPager) < mSectionsPagerAdapter.addFragment(new MyShowsFragment(),"My Shows"); mSectionsPagerAdapter.addFragment(new CountdownFragment(),"Countdowns"); viewPager.setAdapter(mSectionsPagerAdapter); >private void loadSettings() < //Loads settings from database new LoadShowsTask().execute(); >//Adds a show to the "my shows" tab public void addShow(ShowInfo showInfo) < new TvShowTask().execute(showInfo); //Background task to get info from the api EpisodeTrackDatabase.INSTANCE.addShow(showInfo.name,showInfo.imagePath,showInfo.id); //Add the show to the database ((MyShowsFragment)mSectionsPagerAdapter.getItem(0)).addShow(showInfo); //Adds it to the fragment, fragment will then automatically update it >public void addCountdown(long showID) < if(ShowTracker.INSTANCE.calenderCache.contains(showID))return; ((CountdownFragment)mSectionsPagerAdapter.getItem(1)).addCountdown(showID); >@Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) < super.onActivityResult(requestCode, resultCode, data); if (requestCode == NEW_SHOW_REQUEST_CODE && resultCode == NEW_SHOW_REQUEST_RESULT_CODE) < //Create a new show, add it to the list and populate it ShowInfo showInfo = new ShowInfo(); //Creates a new object showInfo.id = data.getLongExtra("showID",0); showInfo.imagePath = data.getStringExtra("showImage"); showInfo.name = data.getStringExtra("showName"); ShowTracker.INSTANCE.addedShowsCache.add(showInfo.id); addShow(showInfo); >> class LoadShowsTask extends AsyncTask< @Override protected String doInBackground(String. strings) < ShowInfo[] showData = EpisodeTrackDatabase.INSTANCE.getAllShows(); runOnUiThread(() ->< new TvShowTask().execute(showData); for (ShowInfo show : showData) < runOnUiThread(() ->addShow(show)); > >); return null; > > class TvShowTask extends AsyncTask> < //Responsible for obtaining info about each show //Automatically prompts on each show add/app initialization @Override protected ListdoInBackground(ShowInfo . shows) < ListtvShowResults = new ArrayList<>(); for (ShowInfo show: shows) < try < Responseresponse = Episodate.INSTANCE .show() .textQuery(show.id + "") .execute(); if(response.isSuccessful()) < tvShowResults.add(response.body().tvShow); >> catch (IOException e) <> > return tvShowResults; > @Override protected void onPostExecute(List result) < for (TvShowResult tvShowResult : result) < TvShow tvShow = new TvShow(tvShowResult); ShowTracker.INSTANCE.addTvShow(tvShow); if(tvShow.getCountdown() != null)< addCountdown(tvShow.getId()); >> > > @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) < switch (requestCode)< case FILE_PERMISSION_RREQUEST_CODE: if(grantResults[0] == PackageManager.PERMISSION_GRANTED)< //Todo Finish this, if we will be implementing saving >break; default: super.onRequestPermissionsResult(requestCode, permissions, grantResults); break; > > //Prevents the app opening multiple search intents, if spammed void startSearchIntent() < if(!ShowSearchActivity.destroyed) return; Intent intent = new Intent(getApplicationContext(),ShowSearchActivity.class); startActivityForResult(intent,NEW_SHOW_REQUEST_CODE); >//Will be used for writing saved data, later on to keep track of what shows are saved boolean hasFilePermissions() < return (Build.VERSION.SDK_INT >22 && ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED); > void askForPermission()< requestPermissions(new String[], FILE_PERMISSION_RREQUEST_CODE); > > 

Я задаюсь вопросом, проще ли в этот момент связываться с github, поскольку существует больше классов, чем только эти 2.

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Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method ‘java.lang.String android.content.Context.getPackageName()’ on a null object reference #166

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method ‘java.lang.String android.content.Context.getPackageName()’ on a null object reference #166

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Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference at com.anjlab.android.iab.v3.BillingBase.getPreferencesBaseKey(BillingBase.java:37) at com.anjlab.android.iab.v3.BillingCache.getPreferencesCacheKey(BillingCache.java:44) at com.anjlab.android.iab.v3.BillingCache.getPreferencesVersionKey(BillingCache.java:48) at com.anjlab.android.iab.v3.BillingCache.getCurrentVersion(BillingCache.java:109) at com.anjlab.android.iab.v3.BillingCache.reloadDataIfNeeded(BillingCache.java:113) at com.anjlab.android.iab.v3.BillingCache.includesProduct(BillingCache.java:77) at com.anjlab.android.iab.v3.BillingProcessor.isPurchased(BillingProcessor.java:141) . at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5422) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

The text was updated successfully, but these errors were encountered:

This error keeps popping up in my Fabric console and there seems to be no fix we can implement in our apps? I don’t wish to edit the library itself.

@heinrichreimer would you mind making PR with a fix?

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference at com.anjlab.android.iab.v3.BillingBase.getPreferencesBaseKey(BillingBase.java:37) at com.anjlab.android.iab.v3.BillingCache.getPreferencesCacheKey(BillingCache.java:44) at com.anjlab.android.iab.v3.BillingCache.getPreferencesVersionKey(BillingCache.java:48) at com.anjlab.android.iab.v3.BillingCache.getCurrentVersion(BillingCache.java:109) at com.anjlab.android.iab.v3.BillingCache.reloadDataIfNeeded(BillingCache.java:113) at com.anjlab.android.iab.v3.BillingCache.includesProduct(BillingCache.java:77) at com.anjlab.android.iab.v3.BillingProcessor.isPurchased(BillingProcessor.java:141) . at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5422) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

please explain how to completely resolve this issue

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android.content.Context.getPackageName () ‘для пустой ссылки на объект

@Override public void afterSubmitClicked(String userId, Bundle bundle) < Log.d(TAG,"Calling time afterSubmitClicked called"+bundle); if(!userId.equals("-1"))< //Logged in successfully //Move to MusicHome Intent mIntent = new Intent(getActivity(),MusicHome.class); mIntent.putExtra("SigninFragment.user_details", bundle); startActivity(mIntent); >else < //Logging in failed //show error dialog >> 

Этот метод вызывается после извлечения класса AsynchronousTask (который расширяет класс AsyncTask). Но у меня крушение. И сообщение об ошибке показывает

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference 

 02-14 16:37:04.648: E/AndroidRuntime(28177): Process: com.raaga.android, PID: 28177 02-14 16:37:04.648: E/AndroidRuntime(28177): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.content.ComponentName.(ComponentName.java:77) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.content.Intent.(Intent.java:3996) 02-14 16:37:04.648: E/AndroidRuntime(28177): at com.raaga.fragments.SigninFragment.afterSubmitClicked(SigninFragment.java:152) 02-14 16:37:04.648: E/AndroidRuntime(28177): at com.raaga.asynctask.SignInAsyncTask.onPostExecute(SignInAsyncTask.java:92) 02-14 16:37:04.648: E/AndroidRuntime(28177): at com.raaga.asynctask.SignInAsyncTask.onPostExecute(SignInAsyncTask.java:1) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.os.AsyncTask.finish(AsyncTask.java:632) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.os.AsyncTask.access$600(AsyncTask.java:177) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.os.Handler.dispatchMessage(Handler.java:102) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.os.Looper.loop(Looper.java:135) 02-14 16:37:04.648: E/AndroidRuntime(28177): at android.app.ActivityThread.main(ActivityThread.java:5221) 02-14 16:37:04.648: E/AndroidRuntime(28177): at java.lang.reflect.Method.invoke(Native Method) 02-14 16:37:04.648: E/AndroidRuntime(28177): at java.lang.reflect.Method.invoke(Method.java:372) 02-14 16:37:04.648: E/AndroidRuntime(28177): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 02-14 16:37:04.648: E/AndroidRuntime(28177): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

Я пробовал себя и исследовал в Google. Но я не получил никакого решения. Может ли кто-нибудь помочь в этом?

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