访问android棉花糖中的联系人问题

Question

我在从我的应用程序中的手机访问联系人时出错。 我已经添加了android棉花糖的访问权限。当我接受应用程序崩溃的权限时。而我不知道有关许可的代码，我使用......可以有一个人告诉我，我要去的地方wrong..here是代码..

public class ContactsDisplay extends AppCompatActivity implements OnItemClickListener,FragmentDrawer.FragmentDrawerListener { 

     private static String TAG = ContactsDisplay.class.getSimpleName(); 

     private Toolbar mToolbar; 
     private FragmentDrawer drawerFragment; 

     Cursor phones; 

     List<String> name1 = new ArrayList<String>(); 
     List<String> phno1 = new ArrayList<String>(); 
     MyAdapter ma ; 
     Button select; 

     private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 1; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      //getActionBar().setDisplayShowTitleEnabled(false); 
      setContentView(R.layout.contacts_display); 
      mToolbar = (Toolbar) findViewById(R.id.toolbar); 
      ImageView img = (ImageView)findViewById(R.id.imageView10); 
      setSupportActionBar(mToolbar); 
      getSupportActionBar().setDisplayShowHomeEnabled(true); 

      drawerFragment = (FragmentDrawer) 
        getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer); 
      drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar); 
      drawerFragment.setDrawerListener(this); 

      // display the second navigation drawer view on app launch 
      displayView(0); 

      getAllContacts(this.getContentResolver()); 
      ListView lv= (ListView) findViewById(R.id.lv); 
      ma = new MyAdapter(); 
      lv.setAdapter(ma); 
      lv.setOnItemClickListener(this); 
      lv.setItemsCanFocus(false); 
      lv.setTextFilterEnabled(true); 
      // adding 
      select = (Button) findViewById(R.id.button1); 

      select.setOnClickListener(new OnClickListener() 
      { 

       @Override 
       public void onClick(View v) { 
        StringBuilder checkedcontacts= new StringBuilder(); 
        System.out.println(".............."+ma.mCheckStates.size()); 
        for(int i = 0; i < name1.size(); i++) 

        { 
         if(ma.mCheckStates.get(i)==true) 
         { 
          checkedcontacts.append(name1.get(i).toString()); 
          checkedcontacts.append("\n"); 

         } 
         else 
         { 
          System.out.println("Not Checked......"+name1.get(i).toString()); 
         } 


        } 

        Toast.makeText(ContactsDisplay.this, checkedcontacts,Toast.LENGTH_LONG).show(); 
       } 
      }); 

     } 

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

     public void onItemClick(AdapterView<?> parent, View view, int position, 
           long id) { 

       ma.toggle(position); 
      } 




     public void getAllContacts(ContentResolver cr) { 

      int result = ContextCompat.checkSelfPermission(ContactsDisplay.this, Manifest.permission.READ_CONTACTS); 
      if (result == PackageManager.PERMISSION_GRANTED){ 

       phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null); 
       contactsdisplay(); 

      } else { 

       requestForLocationPermission(); 
      } 
     } 

     private void requestForLocationPermission() 
     { 

      if (ActivityCompat.shouldShowRequestPermissionRationale(ContactsDisplay.this, Manifest.permission.READ_CONTACTS)) 
      { 
      } 
      else { 

       ActivityCompat.requestPermissions(ContactsDisplay.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS); 
      } 
     } 

     @Override 
     public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) 
     { 
      switch (requestCode) { 
       case MY_PERMISSIONS_REQUEST_READ_CONTACTS: 
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
        { 
    getAllContacts(ContactsDisplay.this.getContentResolver());       
contactsdisplay(); 
        } 
        break; 
      } 
     } 

     public void contactsdisplay() { 

      phones.moveToFirst(); 
     do 
     { 
      String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); 
      String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 
      System.out.println(".................."+phoneNumber); 
      name1.add(name); 
      phno1.add(phoneNumber); 
     }while (phones.moveToNext()); 
     } 

     class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener 
     { private SparseBooleanArray mCheckStates; 
      LayoutInflater mInflater; 
      TextView tv1,tv; 
      CheckBox cb; 
      MyAdapter() 
      { 
       mCheckStates = new SparseBooleanArray(name1.size()); 
       mInflater = (LayoutInflater)ContactsDisplay.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      } 
      @Override 
      public int getCount() { 
       // TODO Auto-generated method stub 
       return name1.size(); 
      } 

      @Override 
      public Object getItem(int position) { 
       // TODO Auto-generated method stub 
       return position; 
      } 

      @Override 
      public long getItemId(int position) { 
       // TODO Auto-generated method stub 

       return 0; 
      } 

      @Override 
      public View getView(final int position, View convertView, ViewGroup parent) { 
       // TODO Auto-generated method stub 
       View vi=convertView; 
       if(convertView==null) 
        vi = mInflater.inflate(R.layout.row, null); 
       TextView tv= (TextView) vi.findViewById(R.id.textView1); 
       tv1= (TextView) vi.findViewById(R.id.textView2); 
       cb = (CheckBox) vi.findViewById(R.id.checkBox_id); 
       tv.setText("Name :"+ name1.get(position)); 
       tv1.setText("Phone No :"+ phno1.get(position)); 
       cb.setTag(position); 
       cb.setChecked(mCheckStates.get(position, false)); 
       cb.setOnCheckedChangeListener(this); 

       return vi; 
      } 
      public boolean isChecked(int position) { 
       return mCheckStates.get(position, false); 
      } 

      public void setChecked(int position, boolean isChecked) { 
       mCheckStates.put(position, isChecked); 
       System.out.println("hello..........."); 
       notifyDataSetChanged(); 
      } 

      public void toggle(int position) { 
       setChecked(position, !isChecked(position)); 
      } 
      @Override 
      public void onCheckedChanged(CompoundButton buttonView, 
             boolean isChecked) { 
       // TODO Auto-generated method stub 

       mCheckStates.put((Integer) buttonView.getTag(), isChecked); 
      } 
     } 


     @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(); 

      //noinspection SimplifiableIfStatement 
      if (id == R.id.action_settings) { 
       return true; 
      } 

      if(id == R.id.action_search){ 
       /*Toast.makeText(getApplicationContext(), vault_no, Toast.LENGTH_SHORT).show(); 
       return true;*/ 
       logout(); 
      } 

      if(id == R.id.action_settings) { 
       return true; 
      } 

      return super.onOptionsItemSelected(item); 
     } 

     private void logout(){ 
      //Creating an alert dialog to confirm logout 
      AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this); 
      alertDialogBuilder.setMessage("Are you sure you want to logout?"); 
      alertDialogBuilder.setPositiveButton("Yes", 
        new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface arg0, int arg1) { 

          //Getting out sharedpreferences 
          SharedPreferences preferences = getSharedPreferences(ClickToLogin.SHARED_PREF_NAME, Context.MODE_PRIVATE); 
          //Getting editor 
          SharedPreferences.Editor editor = preferences.edit(); 

          //Puting the value false for loggedin 
          editor.putBoolean(ClickToLogin.LOGGEDIN_SHARED_PREF, false); 

          //Putting blank value to email 
          editor.putString(ProfileLogin.EMAIL_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.FULLNAME_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.MOBILE_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.POB_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.DOB_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.PIN_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.EMAIL_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.DOC_SHARED_PREF, ""); 
          editor.putString(ClickToLogin.YEAR_SHARED_PREF, ""); 
          editor.clear(); 
          //Saving the sharedpreferences 
          editor.commit(); 

          //Starting login activity 
          Intent intent = new Intent(ContactsDisplay.this, ProfileLogin.class); 
          startActivity(intent); 
         } 
        }); 

      alertDialogBuilder.setNegativeButton("No", 
        new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface arg0, int arg1) { 

         } 
        }); 

      //Showing the alert dialog 
      AlertDialog alertDialog = alertDialogBuilder.create(); 
      alertDialog.show(); 

     } 

     @Override 
     public void onDrawerItemSelected(View view, int position) { 
      displayView(position); 
     } 

     private void displayView(int position) { 
      Fragment fragment = null; 
      String title = getString(R.string.app_name); 
      switch (position) { 
       case 0: 
        /*fragment = new HomeFragment();*/ 
        title = "Work Details1"; 

        break; 

       case 1: 
        /*fragment = new ProfileFragment(); 
        title = getString(R.string.title_profile); 
        break;*/ 
        startActivity(new Intent(this, ContactsDisplay.class)); 
        return; 
       case 2: 

        startActivity(new Intent (this,Events.class)); 
        return; 
        /*fragment = new AboutFragment(); 
        title = getString(R.string.title_about); 
        break;*/ 
       case 3: 
        fragment = new MessagesFragment(); 
        title = getString(R.string.title_messages); 
        break; 

       case 4: 
        fragment = new VideoFragment(); 
        title = getString(R.string.title_video); 
        break; 
       case 5: 
        fragment = new GalleryFragment(); 
        title = getString(R.string.title_gallery); 
        break; 
       case 6: 
        fragment = new GalleryFragment(); 
        title = "Gallery"; 
        break; 

       case 7: 
        fragment = new EventsFragment(); 
        title = getString(R.string.title_events); 
        break; 

       default: 
        break; 
      } 

      if (fragment != null) { 
       FragmentManager fragmentManager = getSupportFragmentManager(); 
       FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
       fragmentTransaction.replace(R.id.container_body, fragment); 
       fragmentTransaction.commit(); 

       // set the toolbar title 
       getSupportActionBar().setTitle(title); 
      } 
     } 

     @Override 
     public void onBackPressed() { 

      finish(); 
      Intent intent = new Intent(ContactsDisplay.this, DocUpload.class); 

      intent.setAction(Intent.ACTION_MAIN); 
      intent.addCategory(Intent.CATEGORY_HOME); 
      intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
      intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); 
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
      startActivity(intent); 

     } 

    } 

这里是logcat的

06-13 05:37:22.000 11581-11581/com.example.miisky E/AndroidRuntime: FATAL EXCEPTION: main 
                  Process: com.example.miisky, PID: 11581 
                  java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.example.miisky/com.example.miisky.ContactsDisplay}: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference 
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:3699) 
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742) 
                  at android.app.ActivityThread.-wrap16(ActivityThread.java) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
                 Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference 
                  at com.example.miisky.ContactsDisplay.contactsdisplay(ContactsDisplay.java:199) 
                  at com.example.miisky.ContactsDisplay.onRequestPermissionsResult(ContactsDisplay.java:190) 
                  at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6553) 
                  at android.app.Activity.dispatchActivityResult(Activity.java:6432) 
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:3695) 
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)  
                 at android.app.ActivityThread.-wrap16(ActivityThread.java)  
                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)  
                 at android.os.Handler.dispatchMessage(Handler.java:102)  
                 at android.os.Looper.loop(Looper.java:148)  
                 at android.app.ActivityThread.main(ActivityThread.java:5417)  
                 at java.lang.reflect.Method.invoke(Native Method)  
                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  

Answer 1

我的代码的问题是AppcompatActivity..i改变AppcompatActivity到Actitvity..Now代码运行正常..Even对棉花糖的访问权限，而访问联系人是问..

因此，这是最后的代码..

public class DisplayContact extends Activity implements OnItemClickListener{ 

    //ArrayList to store name and phone number 
    List<String> name1 = new ArrayList<String>(); 
    List<String> phno1 = new ArrayList<String>(); 
    MyAdapter ma ; 
    Button select; 
    Cursor phones; 

    private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 1; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     getActionBar().setDisplayShowTitleEnabled(false); 
     setContentView(R.layout.display); 


     getAllContacts(this.getContentResolver()); 
     ListView lv= (ListView) findViewById(R.id.lv); 
     ma = new MyAdapter(); 
     lv.setAdapter(ma); 
     lv.setOnItemClickListener(this); 
     lv.setItemsCanFocus(false); 
     lv.setTextFilterEnabled(true); 
     // adding 
     select = (Button) findViewById(R.id.button1); 
     select.setOnClickListener(new View.OnClickListener() 
     { 

      @Override 
      public void onClick(View v) { 
       StringBuilder checkedcontacts= new StringBuilder(); 

       for(int i = 0; i < name1.size(); i++) 

       { 
        if(ma.mCheckStates.get(i)==true) 
        { 
         checkedcontacts.append(name1.get(i).toString()); 
         checkedcontacts.append(phno1.get(i).toString()); 
         checkedcontacts.append("\n"); 

        else 
        { 

        } 
       } 
       Toast.makeText(DisplayContact.this, checkedcontacts, Toast.LENGTH_LONG).show(); 

      } 
     }); 

    } 


    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
     // TODO Auto-generated method stub 
     ma.toggle(arg2); 
    } 

    public void getAllContacts(ContentResolver cr) { 

     int result = ContextCompat.checkSelfPermission(DisplayContact.this, Manifest.permission.READ_CONTACTS); 
     if (result == PackageManager.PERMISSION_GRANTED){ 

      phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null); 
      contactsdisplay(); 

     } else { 

      requestForLocationPermission(); 
     } 
    } 

    private void requestForLocationPermission() 
    { 

     if (ActivityCompat.shouldShowRequestPermissionRationale(DisplayContact.this, Manifest.permission.READ_CONTACTS)) 
     { 
     } 
     else { 

      ActivityCompat.requestPermissions(DisplayContact.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS); 
     } 
    } 

    @Override 
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) 
    { 
     switch (requestCode) { 
      case MY_PERMISSIONS_REQUEST_READ_CONTACTS: 
       if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
       { 
        getAllContacts(DisplayContact.this.getContentResolver()); 
        contactsdisplay(); 
       } 
       break; 
     } 
    } 

    public void contactsdisplay() { 

     //Cursor phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null); 
     while (phones.moveToNext()) 
     { 
      String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); 
      String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 
      System.out.println(".................."+name+ "" +phoneNumber); 
      name1.add(name); 
      phno1.add(phoneNumber); 
     } 

     phones.close(); 
    } 

    class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener 
    { private SparseBooleanArray mCheckStates; 
     LayoutInflater mInflater; 
     TextView tv1,tv; 
     CheckBox cb; 
     MyAdapter() 
     { 
      mCheckStates = new SparseBooleanArray(name1.size()); 
      mInflater = (LayoutInflater)DisplayContact.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     } 
     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return name1.size(); 
     } 

     @Override 
     public Object getItem(int position) { 
      // TODO Auto-generated method stub 
      return position; 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 

      return 0; 
     } 

     @Override 
     public View getView(final int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      View vi=convertView; 
      if(convertView==null) 
       vi = mInflater.inflate(R.layout.row, null); 
      tv= (TextView) vi.findViewById(R.id.contact_name); 
      tv1= (TextView) vi.findViewById(R.id.phone_number); 
      cb = (CheckBox) vi.findViewById(R.id.checkBox_id); 
      tv.setText("Name :"+ name1.get(position)); 
      tv1.setText("Phone No :"+ phno1.get(position)); 
      cb.setTag(position); 
      cb.setChecked(mCheckStates.get(position, false)); 
      cb.setOnCheckedChangeListener(this); 

      return vi; 
     } 
     public boolean isChecked(int position) { 
      return mCheckStates.get(position, false); 
     } 

     public void setChecked(int position, boolean isChecked) { 
      mCheckStates.put(position, isChecked); 
     } 

     public void toggle(int position) { 
      setChecked(position, !isChecked(position)); 
     } 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, 
            boolean isChecked) { 
      // TODO Auto-generated method stub 

      mCheckStates.put((Integer) buttonView.getTag(), isChecked); 
     } 
    } 

    @Override 
    public void onBackPressed() { 

     finish(); 
     Intent intent = new Intent(DisplayContact.this, ProfileDisplay.class); 

     intent.setAction(Intent.ACTION_MAIN); 
     intent.addCategory(Intent.CATEGORY_HOME); 
     intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); 
     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); 
     startActivity(intent); 

    } 
} 

Answer 2

您正在调用getAllContacts（），其中您已经检查了所需的权限，并且如果权限已被授予，您将获得联系人列表。与您的代码问题是当您没有权限时，您正在要求。所以，现在当用户允许或拒绝时，您又需要从onRequestPermissionsResult（）中调用同样的方法getAllContacts（）。目前正在发生该用户允许，但您尚未提取联系人并直接阅读该联系人。

添加您getAllContacts（）调用也在里面onRequestPermissionsResult（）即

@Override 
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults){ 
     switch (requestCode) { 
      case MY_PERMISSIONS_REQUEST_READ_CONTACTS: 
       if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
       { 
        getAllContacts(ContactsDisplay.this.getContentResolver()); 
        contactsdisplay(); 
       }else{ 
        //Show a dialog with explanation why you want contacts permission and ask for permission again or else simply display appropriate error or alert message. 
       } 
       break; 
     } 
    } 

所以要首先解释一下，当你调用getAllContacts（），你已经有权限授予你的光标的手机将具有值。但是如果你没有权限，那么你显示一个请求权限的对话框，并且当用户允许你直接调用contactsdisplay（）时这是错误的。您必须首先获取AllContacts（），只需授予您权限，然后再调用contactsdisplay（）。