Android ProVider读取手机联系人

权限申请:

package com.example.runtimepermission;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
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.view.View;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private ArrayAdapter<String> arrayAdapter;
    private List<String> list = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = (ListView)findViewById(R.id.concact_view);
        arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list);
        listView.setAdapter(arrayAdapter);
        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 {
            cursor=getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
            if(cursor!=null){
                while (cursor.moveToNext()){
                    String names=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    String number=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    list.add(names+"\n"+number);
                }
                arrayAdapter.notifyDataSetChanged();
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(cursor!=null){
                cursor.close();
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode){
            case 1:
                if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
                    readContacts();
                }else {
                    Toast.makeText(this,"requestPermission is error",Toast.LENGTH_SHORT).show();
                }
                break;
            default:
                //break;
        }
    }
}