学习笔记，android:获取联系人列表，点击联系人打电话用android.R.layout.simple_list_item_2形式

本文介绍如何在Android应用中读取手机联系人信息，并实现点击联系人直接拨打电话的功能。通过使用SimpleAdapter适配器展示联系人列表，同时处理权限请求确保应用能访问联系人数据。

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郭霖的第一行代码举了读取联系人的例子，前有打电话的例子，该结合在一起，点击联系人就好打电话。要响应点击单个联系人的事件。布局不改变，但是列表形式要改变：

android.R.layout.simple_list_item_2 或 android.R.layout.simple_expandable_list_item_2。

activity_main.xml

AndroidManifest.xml:

MainActivity.java:

package com.example.contactstest;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract;
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.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private Map contact;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        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(){
        listView = (ListView)findViewById(R.id.contacts_view);
        SimpleAdapter simpleAdapter;
        List> listmaps=new ArrayList>();
        Cursor cursor = null;
        try {
            cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.
                    CONTENT_URI,null, null, null ,null);
            if(cursor != null){
                while (cursor.moveToNext()){
                String dispalyName = cursor.getString(cursor.getColumnIndex(ContactsContract.
                        CommonDataKinds.Phone.DISPLAY_NAME));
                String number = cursor.getString(cursor.getColumnIndex(ContactsContract.
                        CommonDataKinds.Phone.NUMBER));
                    Map map=new HashMap();
                    map.put("name", dispalyName);
                    map.put("number", number);
                    listmaps.add(map);
                }
                /*simpleAdapter=new SimpleAdapter(MainActivity.this, listmaps,
                        android.R.layout.simple_list_item_2, new String[]{"name","number"},
                        new int[]{android.R.id.text1,android.R.id.text2});*/
                simpleAdapter=new SimpleAdapter(MainActivity.this, listmaps,
                        android.R.layout.simple_expandable_list_item_2, new String[]{"name","number"},
                        new int[]{android.R.id.text1,android.R.id.text2});


                listView.setAdapter(simpleAdapter);
                simpleAdapter.notifyDataSetChanged();
                myCall(listmaps);
            }
                }
            catch (Exception e){
            e.printStackTrace();
        }finally {
            if(cursor != null){
                cursor.close();
            }
        }
     }
    @Override
    public void onRequestPermissionsResult(int requesCode, String[]  permissions,
        int[] grantResults) {
        switch (requesCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    readContacts();
                }
                else {
                    Toast.makeText(this, "You denied the permission.", Toast.LENGTH_LONG).show();
                }
                break;
            case 2:
                if(grantResults.length > 0 && grantResults[0] ==PackageManager.
                        PERMISSION_GRANTED){
                    callphone();
                }
                else {
                    Toast.makeText(this, "You denied the permission.",Toast.LENGTH_LONG).show();
                }
                break;

            default:
        }
    }

    public void myCall(final List> mapList){


                listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id){




                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.
                        CALL_PHONE) !=PackageManager.PERMISSION_GRANTED){

                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.
                            permission.CALL_PHONE},2);
                }
                else {
                          Map mMap=mapList.get(position);

                          contact =  mapList.get(position);
                               String number = contact.get("number");



                callphone();
                }
          }

        });
    }




    private void callphone(){
        try{
            Intent intent = new Intent(Intent.ACTION_CALL);
            String num = (String)contact.get("number");


            intent.setData(Uri.parse("tel:"+num));
            startActivity(intent);
        }catch (SecurityException e){
            e.printStackTrace();
        }

    }

}