读取系统联系人
首先我在自己的模拟器中添加几个联系人。
然后开始创建ContactsTest项目
首先编写布局文件:
取出来的联系人在ListView中显示。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="net.nyist.lenovo.contactstest.MainActivity">
<ListView
android:id="@+id/contacts_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
接着修改MainActivity中的代码:
package net.nyist.lenovo.contactstest;
import android.Manifest;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
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);
//获取ListView实例
ListView contactsView = (ListView) findViewById(R.id.contacts_view);
//创建适配器
adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,contactsList);
contactsView.setAdapter(adapter);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS)!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,new String[]{
Manifest.permission.READ_CONTACTS},1);
}else {
readContacts();
}
}
@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, "You denied the permission", Toast.LENGTH_SHORT).show();
}
break;
default:
}
}
private void readContacts() {
Cursor cursor = null;
try{
//查询联系人数据
cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
//由于ContactsContract.CommonDataKinds.Phone类帮我们做好了封装,提供了一个CONTENT_URI常量,
//而这个常量就是使用Uri.parse()方法解析出来的结果。
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));
contactsList.add(displayName+"\n"+number);
}
}
}catch (Exception e){
e.printStackTrace();
}finally {
if (cursor!=null){
cursor.close();
}
}
}
}
最后记得在AndroidManifest.xml中添加android.permission.READ_CONTACTS权限。
这样就大功告成。