AsyncTask Exception innerhalb eines Fragments

AndrejEdd · 2015-04-16T12:45:52+0200

Bezüglich zu meiner Frage:
https://www.android-hilfe.de/forum/android-app-entwicklung.9/activity-in-einem-fragment.679529.html

Erhalte ich nun weitere Exceptions bei den ich nicht weiss wie ich vorgehen soll...

Ich habe nun probiert den Inhalt meiner alten Activity in ein Fragment zu platzieren damit ich dann den inhalt der Alten Activity in einer tabbed Activity als eins der 3 Fragmente habe.

Nun sieht es so aus

MainActivity:

Code:

package com.gibb.picturekicker;

import java.util.Locale;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Set up the action bar.
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections, select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        // For each of the sections in the app, add a tab to the action bar.
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this));
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        // When the given tab is selected, switch to the corresponding page in
        // the ViewPager.
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            // getItem is called to instantiate the fragment for the given page.
            // Return a PlaceholderFragment (defined as a static inner class below).
            
            switch(position) {
                case 0: 
                    return PlaceholderFragment.newInstance(position + 1);
                case 1:
                    return ContactFragment.newInstance("a", "b");
                case 2: 
                    return PlaceholderFragment.newInstance(position + 1);
                default:
                    return PlaceholderFragment.newInstance(position + 1);
            }
            
        }

        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            Locale l = Locale.getDefault();
            switch (position) {
                case 0:
                    return getString(R.string.title_section1).toUpperCase(l);
                case 1:
                    return getString(R.string.title_section2).toUpperCase(l);
                case 2:
                    return getString(R.string.title_section3).toUpperCase(l);
            }
            return null;
        }
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }
    }

}

ContactFragment:

Code:

package com.gibb.picturekicker;

import java.util.ArrayList;
import java.util.List;



import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.Fragment;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

/**
 * A simple {@link Fragment} subclass. Use the
 * {@link ContactFragment#newInstance} factory method to create an instance of
 * this fragment.
 *
 */
public class ContactFragment extends Fragment {

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;
    
    Button aktualisieren;
    ListView lView;
    SimpleAdapter adpt;

    /**
     * Use this factory method to create a new instance of this fragment using
     * the provided parameters.
     *
     * @param param1
     *            Parameter 1.
     * @param param2
     *            Parameter 2.
     * @return A new instance of fragment ContactFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static ContactFragment newInstance(String param1, String param2) {
        ContactFragment fragment = new ContactFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    public ContactFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }

            // Exec async load task
            (new SubConnectToDB()).execute();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // Inflate the layout for this fragment    
         View rootView = inflater.inflate(R.layout.fragment_contact, container, false);
        
        
        aktualisieren = (Button) rootView.findViewById(R.id.aktualisieren);
        
         aktualisieren.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                     (new SubConnectToDB()).execute();

                }
            });
         
         adpt  = new SimpleAdapter(new ArrayList<Contact>(), getActivity());
            
            lView.setAdapter(adpt);
            
       
        lView = (ListView) rootView.findViewById(R.id.listView1);

        return rootView;
    }
    
    private class SubConnectToDB extends AsyncTask<Void, Void, List<Contact>>{
        private final ProgressDialog dialog = new ProgressDialog(getActivity());
        
        @Override
        protected void onPreExecute() {       
            super.onPreExecute();
            dialog.setMessage("Kontake werden geladen...");
            dialog.show();           
        }

        @Override
        protected List<Contact> doInBackground(Void... params) {
            Context context = getActivity().getApplicationContext();
            
            TelephonyManager tMgr = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
            String ownNumber = tMgr.getLine1Number();
            ValueParser pars = new ValueParser();
            ownNumber = pars.parseOwnNumber(ownNumber);
            ArrayList<Contact> myArr = new ArrayList<Contact>();
            

            if(ownNumber != null) {
                Connection connect = new Connection();

                String phoneNumber = "";
                    
                Cursor cursor = context.getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
                while (cursor.moveToNext()) 
                {
                    phoneNumber = pars.getNumber(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));
                    
                    if (connect.existNumber(phoneNumber)) {
                        Contact contact = new Contact();
                        contact.setFirstName(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME))); 
                        contact.setLastName(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.StructuredName.FAMILY_NAME)));
                        Log.d("OnClick: ", phoneNumber + " : " + contact.getFirstName());
                        contact.setPhoneNumber(phoneNumber);
                        myArr.add(contact);
                    }
                }        

                connect.saveContactsInDatabase(ownNumber, myArr);    
    
                  
                Log.d("OnClick: ", "Position: " + connect.existNumber("0552516532"));

                return connect.getContactListFromDatabase(ownNumber);
                
            } else {
                Toast toast = Toast.makeText(getActivity().getApplicationContext(), "You haven't a number !", Toast.LENGTH_SHORT);
                toast.show();
            }
                
            return null;
        }

        @Override
        protected void onPostExecute(List<Contact> result) {
            super.onPostExecute(result);
            dialog.dismiss();
            adpt.setItemList(result);
            adpt.notifyDataSetChanged();           
        }
        
    }
    

}

Meine Exception:

Code:

04-16 12:42:36.887: E/AndroidRuntime(24096): FATAL EXCEPTION: main
04-16 12:42:36.887: E/AndroidRuntime(24096): Process: com.gibb.picturekicker, PID: 24096
04-16 12:42:36.887: E/AndroidRuntime(24096): java.lang.NullPointerException
04-16 12:42:36.887: E/AndroidRuntime(24096):     at com.gibb.picturekicker.ContactFragment.onCreateView(ContactFragment.java:102)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5398)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2586)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.View.measure(View.java:17593)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2305)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1406)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1607)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1264)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6632)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.Choreographer.doCallbacks(Choreographer.java:613)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.Choreographer.doFrame(Choreographer.java:583)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.os.Handler.handleCallback(Handler.java:733)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.os.Handler.dispatchMessage(Handler.java:95)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.os.Looper.loop(Looper.java:146)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at android.app.ActivityThread.main(ActivityThread.java:5635)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at java.lang.reflect.Method.invokeNative(Native Method)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at java.lang.reflect.Method.invoke(Method.java:515)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
04-16 12:42:36.887: E/AndroidRuntime(24096):     at dalvik.system.NativeStart.main(Native Method)

Wie kann ich das problem lösen?

Jaiel · 2015-04-16T15:51:31+0200

guck in zeile 102 wo du die nullpointerex bekommst und prüfe warum du dieses nciht initialisiert hast

04-16 12:42:36.887: E/AndroidRuntime(24096): java.lang.NullPointerException
04-16 12:42:36.887: E/AndroidRuntime(24096): at com.gibb.picturekicker.ContactFragment.onCreateView(ContactFragment.java:102)

reallord · 2015-04-16T18:23:03+0200

Wie Jaiel schon schrieb, der Fehler liegt in Zeile 102.

In 102 machst Du das hier:
lView.setAdapter(adpt);

Und in Zeile 105, also 3 Zeilen später, machst Du das hier:
lView = (ListView) rootView.findViewById(R.id.listView1);

Ich würde empfehlen, erst die ListView zu initialisieren und dann den Adapter zu setzen. :winki:

AndrejEdd · 2015-04-17T09:04:44+0200

reallord super hat geklappt. danke vielmal.

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AsyncTask Exception innerhalb eines Fragments

AndrejEdd

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Jaiel

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reallord

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