[移动开发]Android读取手机通讯录

使用ListView控件呈现
这个根据<第一行代码学习来的> 部分改进
现在的手机读取通讯录都是需要权限的。
布局文件
activity_main

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ListView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/contest_view"/>

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

mainfest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.contactstest">

    <uses-permission android:name="android.permission.READ_CONTACTS"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.ContactsTest">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

main代码：

package com.example.contactstest;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

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

public class MainActivity extends Activity {

    ListView contactsView;
    ArrayAdapter<String> adapter;
    List<String> contactsList=new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        contactsView=(ListView) findViewById(R.id.contest_view);
        adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1
        ,contactsList);
        contactsView.setAdapter(adapter);
        //这个地方就是请求权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(
                    MainActivity.this,new String[]{Manifest.permission.READ_CONTACTS},1);
        } else {
            readContacts();
        }
        //readContacts();
    }

    private void readContacts()
    {
        Cursor cursor=null;
        try {
            cursor =getContentResolver().query(
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                    null,null,null,null);
            while (cursor.moveToNext()) {
                int i_name=cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
                String displayName = cursor.getString(i_name);
                int i_number=cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
                String number = cursor.getString(i_number);
                contactsList.add(displayName + "\n" + number);

            }
        }catch (Exception e)
        {
            e.printStackTrace();
        }finally {
            if (cursor!=null)
            {
                cursor.close();
            }
        }
    }
}

效果：