public Uri addToGroup(long personId, long groupId) { 
 

    this.removeFromGroup(personId, groupId); 
 
    ContentValues values = new ContentValues(); 
    values.put(ContactsContract.CommonDataKinds.GroupMembership.RAW_CONTACT_ID, 
            personId); 
    values.put( 
            ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID, 
            groupId); 
    values 
            .put( 
                    ContactsContract.CommonDataKinds.GroupMembership.MIMETYPE, 
                    ContactsContract.CommonDataKinds.GroupMembership.CONTENT_ITEM_TYPE); 
 
    return this.ctx.getContentResolver().insert( 
            ContactsContract.Data.CONTENT_URI, values); 
 
}

2

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Cursor contactsCursor = this.managedQuery(People.CONTENT_URI,
null, null, null, null);
    startManagingCursor(contactsCursor);

    String[] columnsToMap = new String[] {People.NAME};
    int[] mapTo = new int[] {android.R.id.text1};

    ListAdapter mAdapter = new SimpleCursorAdapter(this,
    android.R.layout.simple_list_item_1,
contactsCursor, columnsToMap, mapTo);
    this.setListAdapter(mAdapter);

3. protected void onListItemClick(ListView l, View v, int position, long id) {
  // GET THE ITEM THAT HAD BEEN TAPPED
  Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, id);
  Cursor c = managedQuery(uri, new String[] {
      People.NUMBER
    }, null, null, null);
  c.moveToFirst();

  // CALL THE NUMBER FROM THE PREVIOUS SCREEN\
  int phoneNumberIndex = c.getColumnIndex(People.NUMBER);
  Uri parsedPhoneNumber = Uri.parse("tel:"+c.getString(phoneNumberIndex));
  Intent i = new Intent(Intent.ACTION_CALL,parsedPhoneNumber);
  startActivity(i);

  super.onListItemClick(l, v, position, id);
}

Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI); startActivityForResult(i, ACTIVITY_SELECT_IMAGE);  

或者

Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
intent.setType("image/*"); 
startActivityForResult(intent, IMAGE_PICK); 

然后主要是下面的实现

protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {  
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent);  
 
    switch(requestCode) {  
    case REQ_CODE_PICK_IMAGE: 
        if(resultCode == RESULT_OK){   
            Uri selectedImage = imageReturnedIntent.getData(); 
            String[] filePathColumn = {MediaStore.Images.Media.DATA}; 
 
            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null); 
            cursor.moveToFirst(); 
 
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
            String filePath = cursor.getString(columnIndex); 
            cursor.close(); 
 
 
            Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath); 
        } 
    } 
}