ch08联系人篇

ch08ContractsDemo

MainActivity.java

package com.example.ch08contactsdemo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView tvContact;
    private ContentResolver resolver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvContact = findViewById(R.id.tv_contact);

        //获取ContentResolver对象
        resolver = getContentResolver();
        //定义保存联系人信息的字符串变量
        StringBuffer buffer = new StringBuffer();
        //1.获取联系人的ID和姓名
        Cursor cursor = resolver.query(
                ContactsContract.Contacts.CONTENT_URI,
                null, null,
                null,null);
        //获取联系人的id和name
        while(cursor.moveToNext()){
            String id = cursor.getString(
                    cursor.getColumnIndex(ContactsContract.Contacts._ID));
            String name = cursor.getString(
                    cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)
            );
            if(!"".equals(name)){
                buffer.append(name + ": \n");
            }else{
                buffer.append("无名: \n");
            }
            //2.通过ID查询其对应的phone
            Cursor phoneCursor = resolver.query(
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                    null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=?",
                    new String[]{id},null);
            //遍历phoneCuror得到该联系人所有的电话信息
            while(phoneCursor.moveToNext()){
                //获取电话号码
                String phone = phoneCursor.getString(
                        phoneCursor.getColumnIndex(
                                ContactsContract.CommonDataKinds.Phone.NUMBER));
                buffer.append(phone + ", ");
            }
            buffer.append("\n");
            //3.通过ID查询其对应的email
            Cursor emailCursor = resolver.query(
                    ContactsContract.CommonDataKinds.Email.CONTENT_URI,
                    null,
                    ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=" +id,
                    null, null
            );
            while(emailCursor.moveToNext()){
                //获取该联系人的email信息
                String email = emailCursor.getString(
                        emailCursor.getColumnIndex(
                                ContactsContract.CommonDataKinds.Email.ADDRESS
                        )
                );
                buffer.append(email + ",");
            }
            //换行显示下一个联系人
            buffer.append("\n");
        }
        //将获取到的联系人信息显示在文本框中
        tvContact.setText(buffer.toString());
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ch08contactsdemo">

    <!--    添加读写联系*限  -->
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_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/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

ch08_01contactTest

ExampleInstrumentedTest.java

• List item

package com.example.ch08_01contacttest;

import android.content.Context;

import androidx.test.platform.app.InstrumentationRegistry;
import androidx.test.ext.junit.runners.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
 * Instrumented test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
        assertEquals("com.example.ch08_01contacttest", appContext.getPackageName());
    }
}

本文地址：https://blog.csdn.net/u013140841/article/details/108988384