<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical">  <ListView    android:id="@+id/contacts_view"    android:layout_width="match_parent"    android:layout_height="match_parent">  </ListView></LinearLayout>

public class MainActivity extends AppCompatActivity {  ArrayAdapter<String> adapter;  List<String> contactsList=new ArrayList<>();  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //獲取到listview并且設置適配器    ListView contactsView= (ListView) findViewById(R.id.contacts_view);    adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,contactsList);    contactsView.setAdapter(adapter);    //判斷是否開啟讀取通訊錄的權限    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS)!= PackageManager        .PERMISSION_GRANTED){      ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_CONTACTS},1);    }else {      readContacts();    }  }  private void readContacts() {    Cursor cursor=null;    try {      //查詢聯系人數據,使用了getContentResolver().query方法來查詢系統的聯系人的數據      //CONTENT_URI就是一個封裝好的Uri，是已經解析過得常量      cursor=getContentResolver().query(          ContactsContract.CommonDataKinds.Phone.CONTENT_URI,          null,          null,          null,          null      );      //對cursor進行遍歷，取出姓名和電話號碼      if (cursor!=null){        while (cursor.moveToNext()){          //獲取聯系人姓名          String displayName=cursor.getString(cursor.getColumnIndex(              ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME          ));          //獲取聯系人手機號          String number=cursor.getString(cursor.getColumnIndex(              ContactsContract.CommonDataKinds.Phone.NUMBER          ));          //把取出的兩類數據進行拼接，中間加換行符，然后添加到listview中          contactsList.add(displayName+"/n"+number);        }        //刷新listview        adapter.notifyDataSetChanged();      }    }catch (Exception e){      e.printStackTrace();    }finally {      //記得關掉cursor      if (cursor!=null){        cursor.close();      }    }  }  @Override  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {    switch (requestCode){      case 1:        if (grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED){          readContacts();        }else {          Toast.makeText(this,"沒有權限",Toast.LENGTH_SHORT).show();        }        break;      default:        break;    }  }}

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