android之获取联系人列表

public class SelectContactActivty extends Activity {
    private ListView lt_selectcontact;

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

        setContentView(R.layout.activity_selectcontact);

        lt_selectcontact = findViewById(R.id.lt_selectcontact);
        final List<Map<String, String>> data = getContactInfo();//获取用户列表
//        Adapter adp=new SimpleAdapter(this,data,R.layout.contact_item,new String[]{"name","phone"},new int[]{R.id.tv_contatc_name,R.id.tv_contatc_phonenum});
//        lt_selectcontact.setAdapter((ListAdapter) adp);
        lt_selectcontact.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String phone=data.get(i).get("phone");
                Intent data=new Intent();
                data.putExtra("phone",phone);
                setResult(0,data);
                finish();
            }
        });
    }

    //读取手机里面的联系人
    public List<Map<String, String>> getContactInfo() {
        //吧所有联系人填进去
        List<Map<String, String>> list = new ArrayList<Map<String, String>>();

        ContentResolver resolver = getContentResolver();
        String uristring = "content://com.android.contacts/raw_contacts";
        String data = "content://com.android.contacts/raw_contacts/data";
        Uri uri = Uri.parse(uristring);
        Uri uridata = Uri.parse(data);
        Cursor cursor = resolver.query(uri, new String[]{"contact_id"}, null, null, null);

        while (cursor.moveToNext()) {
            String contact_id = cursor.getString(0);
            if (contact_id != null) {
                //具体的某一个联系人
                Map<String, String> map = new HashMap<String, String>();
                Cursor datacursor = resolver.query(uridata, new String[]{"data1", "mimetype"}, "contact_id=?", new String[]{contact_id}, null);
                while (datacursor.moveToNext()) {
                    String data1 = datacursor.getString(0);
                    String mimetype = datacursor.getString(1);
                    if ("vnd.android.cursor.item/name".equals(mimetype)) {
                        //联系人的姓名
                        map.put("name", data1);
                    } else if ("vnd.android.cursor.item/phone_v2".equals(mimetype)) {
                        //联系人的电话号码
                        map.put("phone", data1);
                    }

                }
                list.add(map);
                datacursor.close();
            }
        }

        return list;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

<TextView
    android:id="@+id/tv_nav"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="22sp"
    android:text="选择联系人"
    android:gravity="center"
    android:background="#8866ff00"/>
<ListView
    android:id="@+id/lt_selectcontact"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ></ListView>

</LinearLayout>