資料結構
網路
RDBMS
作業系統
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP
物理學
化學
生物學
數學
英語
經濟學
心理學
社會學
時尚研究
法學研究如何讀取 android 中的所有聯絡人？
本示例演示瞭如何讀取 android 中的所有聯絡人
步驟 1 − 在 Android Studio 中建立一個新專案，依次轉到檔案 ⇒ 新建專案，並填寫所有必需的詳細資訊來建立一個新專案。
步驟 2 − 將以下程式碼新增到 res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:gravity = "center" android:layout_height = "match_parent"> <ListView android:id = "@+id/list" android:layout_width = "wrap_content" android:textSize = "30sp" android:layout_height = "wrap_content" android:text = "Click"/> </LinearLayout>
在以上程式碼中，我們選取了列表檢視。
步驟 3 − 將以下程式碼新增到 src/MainActivity.java
<?xml version = "1.0" encoding = "utf-8"?>
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
public static final int REQUEST_READ_CONTACTS = 79;
ListView list;
ArrayList mobileArray;
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_CONTACTS)
== PackageManager.PERMISSION_GRANTED) {
mobileArray = getAllContacts();
} else {
requestPermission();
}
list = findViewById(R.id.list);
ArrayAdapter adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, mobileArray);
list.setAdapter(adapter);
}
private void requestPermission() {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_CONTACTS)) {
// show UI part if you want here to show some rationale !!!
} else {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.READ_CONTACTS},
REQUEST_READ_CONTACTS);
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_CONTACTS)) {
} else {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.READ_CONTACTS},
REQUEST_READ_CONTACTS);
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case REQUEST_READ_CONTACTS: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
mobileArray = getAllContacts();
} else {
// permission denied,Disable the
// functionality that depends on this permission.
}
return;
}
}
}
private ArrayList getAllContacts() {
ArrayList<String> nameList = new ArrayList<>();
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
if ((cur ! = null ? cur.getCount() : 0) > 0) {
while (cur ! = null && cur.moveToNext()) {
String id = cur.getString(
cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(
ContactsContract.Contacts.DISPLAY_NAME));
nameList.add(name);
if (cur.getInt(cur.getColumnIndex( ContactsContract.Contacts.HAS_PHONE_NUMBER)) > 0) {
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
new String[]{id}, null);
while (pCur.moveToNext()) {
String phoneNo = pCur.getString(pCur.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.NUMBER));
}
pCur.close();
}
}
}
if (cur ! = null) {
cur.close();
}
return nameList;
}
}步驟 4 − 將以下程式碼新增到 AndroidManifest.xml
<?xml version = "1.0" encoding = "utf-8"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.example.myapplication"> <uses-permission android:name = "android.permission.READ_CONTACTS" /> <application android:allowBackup = "true" android:theme = "@style/AppTheme.NoActionBar" android:icon = "@mipmap/ic_launcher" android:label = "@string/app_name" android:roundIcon = "@mipmap/ic_launcher_round" android:supportsRtl = "true"> <activity android:name = ".MainActivity" android:configChanges = "keyboardHidden|orientation|screenSize"> <intent-filter> <action android:name = "android.intent.action.MAIN" /> <action android:name = "android.intent.action.CREATE_SHORTCUT" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行你的應用程式。我假設你已將你的實際 Android 移動裝置連線到了你的計算機。要從 android studio 執行應用，請開啟你的一個專案的活動檔案，然後單擊工具欄中的執行
圖示。選擇你的移動裝置作為選項，然後檢查你的移動裝置，它將顯示你的預設螢幕 -
更新於： 2019-7-30
4K+ 瀏覽量
廣告