Invio dell'elenco di matrici di oggetti tra le attività con Parcelable

Question

Desidero inviare un elenco di oggetti di matrice da un'attività all'altra. Sto estendendo la mia classe di oggetti con Parcelable e l'elenco trasferito usando intent onActivityResult.

Ma l'elenco mostra null in seconda attività.

prima attività:

public class PlanEventActivity extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener, 
DatePickerDialog.OnDateSetListener{ 

private boolean mHoursMode; 
RelativeLayout chooseEvent,time,date; 
EditText eventName; 
TextView timeTextView,dateTextView,chooseEventText; 
static final int CUSTOM_DIALOG_ID = 0; 
ListView dialog_ListView; 
private ImageView addOrganizer; 
static final int PICK_CONTACT_REQUEST = 1; 
private ArrayList<contact> mSelectedContacts; 
private ListViewAdapter mAdapter; 
private ListView mContactsList; 
private ArrayList<Integer> selectedItemsPositions; 
private boolean mContactListActivity; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_plan_event); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    toolbar.setTitle(""); 

    TextView toolbarTitle = (TextView) toolbar.findViewById(R.id.toolbar_title); 
    toolbarTitle.setText("MeaVita"); 
    setSupportActionBar(toolbar); 

    setUpUI(); 

    mAdapter = new ListViewAdapter(this,mSelectedContacts); 
    mContactsList.setAdapter(mAdapter); 
    mAdapter.setMode(Attributes.Mode.Single); 

    mContactsList.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      ((SwipeLayout)(mContactsList.getChildAt(position - mContactsList.getFirstVisiblePosition()))).open(true); 
     } 
    }); 

} 

public void setUpUI() 
{ 
    chooseEvent = (RelativeLayout)findViewById(R.id.chooseEventLayout); 

    time = (RelativeLayout)findViewById(R.id.timeLayout); 

    date = (RelativeLayout)findViewById(R.id.dateLayout); 

    eventName = (EditText)findViewById(R.id.editTextEventName); 

    timeTextView = (TextView)findViewById(R.id.timeTextView); 

    dateTextView = (TextView)findViewById(R.id.dateTextView); 

    chooseEventText = (TextView)findViewById(R.id.chooseEventTextView); 

    addOrganizer = (ImageView)findViewById(R.id.addOrganizer); 

    mContactsList = (ListView)findViewById(R.id.selectedContactsList); 

    mSelectedContacts = new ArrayList<>(); 

    contact contact = new contact(); 

    contact.setContactid("1"); 
    contact.setContactName("sid"); 


    mSelectedContacts.add(contact); 
    contact.setContactid("2"); 
    contact.setContactName("ssss"); 

    mSelectedContacts.add(contact); 

    addOrganizer.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      Intent pickContactIntent = new Intent(PlanEventActivity.this,ContactList.class); 
      startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST); 

     } 
    }); 



@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // Check which request we're responding to 
    if (requestCode == PICK_CONTACT_REQUEST) { 
     // Make sure the request was successful 
     if (resultCode == RESULT_OK) { 


      Bundle bundle = data.getExtras(); 

      mContactListActivity = bundle.getBoolean("contactListActivity",true); 
      mSelectedContacts = bundle.getParcelableArrayList("selectedContacts"); 
     } 

     if(mContactListActivity) 
     { 

      addOrganizer.setVisibility(View.INVISIBLE); 
      mContactsList.setVisibility(View.VISIBLE); 

     } 

     else { 

      mContactsList.setVisibility(View.GONE); 
     } 

    } 
} 

Seconda azione: classe

public class ContactList extends AppCompatActivity { 

private ArrayList<contact> contact_list = null; 
private contactAdapter mContactAdapter = null; 

private ArrayList<contact> items; 
private ArrayList<contact> selectedContacts; 
boolean[] isChecked; 
Cursor mCursor; 
ListView lv; 
public int RQS_PICK_CONTACT = 1; 
private static final int PERMISSIONS_REQUEST_READ_CONTACTS = 100; 
ArrayList<Integer> selectedItemsPositions; 
private ImageView done; 
private boolean mContactListActivity; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.activity_contacts_list); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 

    toolbar.setTitle(""); 
    TextView toolbarTitle = (TextView) toolbar.findViewById(R.id.toolbar_title); 

    toolbarTitle.setText("Select Contacts"); 

    setSupportActionBar(toolbar); 

    done = (ImageView)findViewById(R.id.done); 

    contact_list = new ArrayList<contact>(); 

    selectedContacts = new ArrayList<contact>(); 

    lv = (ListView)findViewById(R.id.list); 

    showContacts(); 


    done.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      Log.d("selectd",String.valueOf(selectedItemsPositions)); 

      mContactListActivity = true; 

      selectedContacts = new ArrayList<>();//to store selected items 

      for (Integer pos : selectedItemsPositions) { 
       selectedContacts.add(items.get(pos)); 
      } 

      Intent i = new Intent(ContactList.this,PlanEventActivity.class); 

      Bundle b = new Bundle(); 
      b.putSerializable("selectedContacts",(Serializable) selectedContacts); 
      i.putExtras(b); 

      setResult(RESULT_OK, i); 

      finish(); 


     } 
    }); 

} 

@SuppressWarnings("unused") 
private void getContacts() { 


    String[] projection = new String[] { 
      ContactsContract.Contacts.DISPLAY_NAME, 
      ContactsContract.Contacts.HAS_PHONE_NUMBER, 
      ContactsContract.Contacts._ID }; 


    mCursor = managedQuery(ContactsContract.Contacts.CONTENT_URI, null, null, null,null); 

    while (mCursor.moveToNext()) { 
     contact contact = new contact(); 

     String contactId = mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts._ID)); 

     contact.setContactid(mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts._ID))); 
     contact.setContactName(mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME))); 
     contact_list.add(contact); 
    } 
    isChecked = new boolean[mCursor.getCount()]; 

    for (int i = 0; i < isChecked.length; i++) { 
     isChecked[i] = false; 
    } 


    this.mContactAdapter = new contactAdapter(this, R.layout.contact_list_item, contact_list); 
    lv.setAdapter(this.mContactAdapter); 
// mCursor.close(); 

} 


@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // TODO Auto-generated method stub 
    super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == RQS_PICK_CONTACT) { 
     if (resultCode == RESULT_OK) { 

      getContacts(); 

     } 
    } 
} 

public class contactAdapter extends ArrayAdapter<contact> { 


    public contactAdapter(Context context, int textViewResourceId, ArrayList<contact> items1) { 
     super(context, textViewResourceId, items1); 
     items = items1; 
     selectedItemsPositions = new ArrayList<>(); 
    } 

//to store all selected items position 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     final ViewHolder mViewHolder; 

     if (convertView == null) { 
      mViewHolder = new ViewHolder(); 
      LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = vi.inflate(R.layout.contact_list_item, parent, false); 
      mViewHolder.cb = (CheckBox) convertView.findViewById(R.id.checkBox); 
      mViewHolder.name = (TextView) convertView.findViewById(R.id.name); 

      mViewHolder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

       @Override 
       public void onCheckedChanged(CompoundButton buttonView, boolean ischecked) { 
        int position = (int) mViewHolder.cb.getTag(); 
        if (ischecked) { 
         //check whether its already selected or not 
         if (!selectedItemsPositions.contains(position)) 
          selectedItemsPositions.add(position); 
        } else { 
         //remove position if unchecked checked item 
         selectedItemsPositions.remove((Object) position); 
        } 
       } 
      }); 

      convertView.setTag(mViewHolder); 
     } else { 
      mViewHolder = (ViewHolder) convertView.getTag(); 
     } 

     contact contacts = items.get(position); 
     mViewHolder.cb.setTag(position); 

     if (selectedItemsPositions.contains(position)) 
      mViewHolder.cb.setChecked(true); 
     else 
      mViewHolder.cb.setChecked(false); 

     mViewHolder.name.setText(contacts.getContactName()); 


     return convertView; 
    } 


    public class ViewHolder { 
     CheckBox cb; 
     TextView name; 
    } 


} 

@Override 
public void onRequestPermissionsResult(int requestCode, String[] permissions, 
             int[] grantResults) { 
    if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS) { 
     if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { 
      // Permission is granted 
      getContacts(); 
     } else { 
      Toast.makeText(this, "Until you grant the permission, we canot display the names", Toast.LENGTH_SHORT).show(); 
     } 
    } 
} 


private void showContacts() 
{ 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { 

     requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS); 
     //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method 
    } 

    else { 

     getContacts(); 

    } 

} 

} 

Oggetto:

public class contact implements Parcelable { 

    private String contactName; 
    private String contactId; 

    contact(){} 

    contact(String contactId,String contactName) 
    { 
     this.contactId = contactId; 
     this.contactName = contactName; 

    } 

    public contact(Parcel in) { 
     this(); 
     contactId = in.readString(); 
     contactName = in.readString(); 

    } 
    public void writeToParcel(Parcel dest, int flags) { 

     dest.writeString(contactId); 
     dest.writeString(contactName); 

    } 

    public static final Parcelable.Creator<contact> CREATOR = new Parcelable.Creator<contact>() 
    { 
     public contact createFromParcel(Parcel in) 
     { 
      return new contact(in); 
     } 
     public contact[] newArray(int size) 
     { 
      return new contact[size]; 
     } 
    }; 

    public int describeContents() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    public String getContactName() { 
     return contactName; 
    } 

    public void setContactName(String contactName) { 
     this.contactName = contactName; 
    } 

    public String getContactid() { 
     return contactId; 
    } 

    public void setContactid(String contactId) { 
     this.contactId = contactId; 
    } 



} 

Non

ottenere ciò che sta andando storto. Qualcuno può aiutare, per favore. Grazie ..

Answer 1

Quando si ricevono i risultati di una chiamata startActivityForResult(), il risultato Intent viene passato al metodo onActivityResult() come ultimo parametro. Stai utilizzando il Intent restituito da getIntent(), che è il Intent utilizzato per avviare l'attuale Activity, quindi non avrà gli extra che stai cercando.

In onActivityResult(), ottenere il Bundle dal dataIntent passato nel metodo.

Bundle bundle = data.getExtras(); 

Avrete anche bisogno di rimuovere questa linea in onActivityResult():

mSelectedContacts = bundle.getParcelableArrayList("selectedContacts"); 

e sostituirlo con:

ArrayList<contact> newContacts = bundle.getParcelableArrayList("selectedContacts"); 
mSelectedContacts.addAll(newContacts); 
mAdapter.notifyDataSetChanged(); 

E assicurarsi che hai cambiato la chiamata b.putSerializable() in ContactList a b.putParcelableArrayList("selectedContacts", selectedContacts).

Answer 2

USO QUESTO

 Bundle b = this.getIntent().getExtras(); 
     mSelectedContacts = b.getParcelableArrayList("selectedContacts"); 

INVECE DI

 Intent i = getIntent(); 
     Bundle bundle = i.getExtras(); 
     mSelectedContacts = i.getParcelableArrayListExtra("selectedContacts"); 

Answer 3

fare in questo modo:

Bundle b = new Bundle(); 
b.putSerializable("selectedContacts", selectedContacts); 
i.putExtras(b); 

EDIT 2: recuperarlo da:

Bundle bundle = i.getExtras(); 
mContactListActivity = i.getBooleanExtra("contactListActivity",true); 
mSelectedContacts = (ArrayList<contact>) i.getSerializableExtra("selectedContacts"); 

E non dimenticate:

public class contact implements Serializable {...} 

EDIT:

RIMUOVERE (Serializable):

Non scrivere questo:

b.putSerializable("selectedContacts",(Serializable) selectedContacts); 

scrivere questo:

b.putSerializable("selectedContacts",selectedContacts); 

Answer 4

Ho controllato il codice e ottenere alcuni problemi minori,

Quindi può essere fissandolo si possono ottenere risultati.

Seguire i passaggi seguenti.

(1) Nel file di PlanEventActivity, cambiare onActivityResult da sotto,

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // Check which request we're responding to 
    if (requestCode == PICK_CONTACT_REQUEST) { 
     // Make sure the request was successful 
     if (resultCode == RESULT_OK) { 


      Bundle bundle = data.getExtras(); 

      mContactListActivity = bundle.getBoolean("contactListActivity",true); 
      mSelectedContacts = (ArrayList<contact>) bundle.getSerializable("selectedContacts"); 
      mAdapter.notifyDataSetChanged(); 
    } 

     if(mContactListActivity) 
     { 

     addOrganizer.setVisibility(View.INVISIBLE); 
     mContactsList.setVisibility(View.VISIBLE); 

     } 

     else { 

      mContactsList.setVisibility(View.GONE); 
     } 

} 

Come si stanno ottenendo risultati correttamente, ma senza convertirlo in tipo corretto si otterrà nulla, quindi è necessario convertire il risultato Parcelable elenco di array nel tuo arraylist di contatti altrimenti non funzionerà. Inoltre, dopo aver ottenuto l'elenco da visualizzare nella visualizzazione elenco, è necessario notificare all'adattatore che il set di dati è stato modificato. Inoltre, stai mettendo in pausa oggetti serializzabili e poi ottieni il metodo getSerializable.

(2) Implementare Serializable, invece di Parcelable per oggetto, come di seguito

public class contact implements Serializable. 

E ora tenta di eseguire la vostra applicazione, quasi fatto si otterrà risultato.