Android读取手机通讯录联系人到自己项目

 public class MainActivity extends AppCompatActivity { ArrayAdapter adapter; List contactsList=new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //获取到listview并且设置适配器 ListView contactsView= (ListView) findViewById(R.id.contacts_view); adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,contactsList); contactsView.setAdapter(adapter); //判断是否开启读取通讯录的权限 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 { //查询联系人数据,使用了getContentResolver().query方法来查询系统的联系人的数据 //CONTENT_URI就是一个封装好的Uri，是已经解析过得常量 cursor=getContentResolver().query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null ); //对cursor进行遍历，取出姓名和电话号码 if (cursor!=null){ while (cursor.moveToNext()){ //获取联系人姓名 String displayName=cursor.getString(cursor.getColumnIndex( ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME )); //获取联系人手机号 String number=cursor.getString(cursor.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER )); //把取出的两类数据进行拼接，中间加换行符，然后添加到listview中 contactsList.add(displayName+"\n"+number); } //刷新listview adapter.notifyDataSetChanged(); } }catch (Exception e){ e.printStackTrace(); }finally { //记得关掉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,"没有权限",Toast.LENGTH_SHORT).show(); } break; default: break; } } }