How to Get All Contact From Phone

Need

ContactPickerActivity.java

ResultActivity.java

activity_read_all_contact.xml

result.xml


Step 1:

ContactPickerActivity.java


public class ContactPickerActivity extends AppCompatActivity implements View.OnClickListener {
    Button button;
    ListView listView;
    ArrayAdapter<String> adapter;

    ArrayList<String> StoreContacts ;
    Cursor cursor ;
    String name, phonenumber ;
    public  static final int RequestPermissionCode  = 1 ;
    /** Called when the activity is first created. */  
  @Override    
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity3_contact_picker);

        findViewsById();

        StoreContacts = new ArrayList<String>();

        EnableRuntimePermission();
        GetContactsIntoArrayList();


        adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, StoreContacts);
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        listView.setAdapter(adapter);

        button.setOnClickListener(this);
    }

    private void findViewsById() {
        listView = (ListView) findViewById(R.id.list);
        button = (Button) findViewById(R.id.testbutton);
    }

    public void onClick(View v) {
        SparseBooleanArray checked = listView.getCheckedItemPositions();
        ArrayList<String> selectedItems = new ArrayList<String>();
        for (int i = 0; i < checked.size(); i++) {
            // Item position in adapter           
 int position = checked.keyAt(i);
            // Add sport if it is checked i.e.) == TRUE!    
        if (checked.valueAt(i))
                selectedItems.add(adapter.getItem(position));
        }

        String[] outputStrArr = new String[selectedItems.size()];

        for (int i = 0; i < selectedItems.size(); i++) {
            outputStrArr[i] = selectedItems.get(i);
        }

        Intent intent = new Intent(getApplicationContext(),
                ResultActivity.class);

        // Create a bundle object    
    Bundle b = new Bundle();
        b.putStringArray("selectedItems", outputStrArr);

        // Add the bundle to the intent.  
      intent.putExtras(b);

        // start the ResultActivity    
    startActivity(intent);
    }
    public void GetContactsIntoArrayList(){

        cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null, null, null);

        while (cursor.moveToNext()) {

            name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));

            phonenumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

            StoreContacts.add(name + " "  + ":" + " " + phonenumber);
        }

        cursor.close();

    }

    public void EnableRuntimePermission(){

        if (ActivityCompat.shouldShowRequestPermissionRationale(
                ContactPickerActivity.this,
                Manifest.permission.READ_CONTACTS))
        {

            Toast.makeText(ContactPickerActivity.this,"CONTACTS permission allows us to Access CONTACTS app", Toast.LENGTH_LONG).show();

        } else {

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

        }
    }

    @Override    public void onRequestPermissionsResult(int RC, String per[], int[] PResult) {

        switch (RC) {

            case RequestPermissionCode:

                if (PResult.length > 0 && PResult[0] == PackageManager.PERMISSION_GRANTED) {

                    Toast.makeText(ContactPickerActivity.this,"Permission Granted, Now your application can access CONTACTS.", Toast.LENGTH_LONG).show();

                } else {

                    Toast.makeText(ContactPickerActivity.this,"Permission Canceled, Now your application cannot access CONTACTS.", Toast.LENGTH_LONG).show();

                }
                break;
        }
    }
}

Step 2:
public class ResultActivity extends Activity {
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);

        Bundle b = getIntent().getExtras();
        String[] resultArr = b.getStringArray("selectedItems");
        ListView lv = (ListView) findViewById(R.id.outputList);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, resultArr);
        lv.setAdapter(adapter);
    }

}
Step 3:
result.xml
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/outputList"    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

Step 4:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Button
        android:id="@+id/testbutton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="@string/submit" />

    <ListView        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@id/testbutton"
        android:layout_alignParentTop="true" 
       />
</RelativeLayout>

Step 5:
<uses-permission android:name="android.permission.READ_CONTACTS" />