關鍵技術

- 內容解析者Resolver

- ListView

- Socket網絡編程

權限申請

//需要在Manifest.xml文件中申請權限

布局：

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:orientation="vertical"

android:layout_height="match_parent"

tools:context=".MainActivity">

android:id="@+id/btn"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="讀取聯系人"

android:textSize="20sp"/>

android:id="@+id/listview"

android:layout_width="match_parent"

android:layout_height="match_parent"

/>

這里的布局就很簡單，一個按鈕和一個ListView組件

main_activity文件

package com.example.resolver;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.app.ActivityCompat;

import android.Manifest;

import android.content.ContentResolver;

import android.content.pm.PackageManager;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.view.View;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

import java.io.File;

import java.io.FileOutputStream;

import java.util.ArrayList;

import java.util.List;

import static android.provider.ContactsContract.CommonDataKinds.Phone.CONTENT_URI;

import static android.provider.ContactsContract.CommonDataKinds.Phone.NUMBER;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

Button btn;

TextView lv;

ContentResolver resolver;

ListView listView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btn = findViewById(R.id.btn);

// lv=findViewById(R.id.lv);

listView = findViewById(R.id.listview);

resolver = this.getContentResolver();

btn.setOnClickListener(this);

}

@Override

public void onClick(View v) {

if (v.getId() == R.id.btn) {

//需要動態申請權限，適用于Android 6.0以上版本

ActivityCompat.requestPermissions(this, new String[]{

Manifest.permission.READ_CONTACTS,Manifest.permission.INTERNET}, 1);

}

}

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

super.onRequestPermissionsResult(requestCode, permissions, grantResults);

if (requestCode == 1) {

for (int i = 0; i < permissions.length; i++) {

if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {

readContacts();//讀取聯系人

} else {

Toast.makeText(this, "未授權讀取聯系人", Toast.LENGTH_LONG).show();

}

}

}

}

private void readContacts() {

List contactInfos = new ArrayList<>();

//創建游標對查詢通訊錄信息

Cursor cursor = resolver.query(CONTENT_URI,

null, null, null, null);

while (cursor.moveToNext()) {

if (cursor != null) {

String Number = cursor.getString(cursor.getColumnIndexOrThrow(NUMBER));

String name = cursor.getString(cursor.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME));

ContactInfo contactInfo = new ContactInfo(name, Number);

contactInfos.add(contactInfo);

}

}

cursor.close();

String[] data = new String[contactInfos.size()];

int count = 0;

//將列表contactInfos的數據填充進一個數組，方便后面將聯系人信息填入ListView

for (ContactInfo info : contactInfos) {

data[count] = info.getName() + "電話:" + info.getNumber();

count += 1;

}

ContactUpload contactUpload=new ContactUpload(data);//上傳聯系人信息，需要單獨創建一個實體類

//創建適配器對象，將聯系人填入ListView組件中去

ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, data);

listView.setAdapter(adapter);

}

}

上傳通訊錄：contactUpload

package com.example.resolver;

import java.io.IOException;

import java.io.OutputStream;

import java.net.Socket;

public class ContactUpload {

public ContactUpload(final String[] contact) {

//創建一個線程用于實現上傳通訊錄，否則會報錯

new Thread(new Runnable() {

@Override

public void run() {

try {

//創建Socket對象，綁定IP地址、端口號

Socket socket = new Socket("192.168.137.1", 6800);

OutputStream outputStream = socket.getOutputStream();

for (int i = 0; i < contact.length; i++) {

outputStream.write((contact[i] + "\n").getBytes());

}

outputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}).start();

}

}

服務端數據

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.ServerSocket;

import java.net.Socket;

import java.time.LocalDateTime;

import java.time.format.DateTimeFormatter;

/**

* Created by 29173 on 2020/4/12.

*/

public class server {

public static void main(String[] args) {

try {

ServerSocket ss = new ServerSocket(6800);

Socket socket = ss.accept();

InputStream is = socket.getInputStream();

byte[] bytes = new byte[1024];

int len;

StringBuilder sb = new StringBuilder();

while ((len = is.read(bytes)) != -1) {

sb.append(new String(bytes, 0, len, "UTF-8"));

}

String userID=UserID();

File file = new File(userID+".txt");

FileOutputStream fis = new FileOutputStream(file);

StringBuffer sbf = new StringBuffer(sb);

fis.write(sb.toString().getBytes());

System.out.println(sb);

socket.shutdownInput();

} catch (IOException e) {

e.printStackTrace();

}

}

public static String UserID(){

String date= LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));

String userID=date.toString();

return userID;

}

}

結束

這個項目總體上來說非常簡單，入門實踐作品，Android開發中很容易遇到各種坑，歡迎聯系我，相互交流學習經驗。

大家有興趣的可以到我的個人博客看一看：點擊這里到我的博客看一看

總結

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