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法学研究如何读取 android 中的所有联系人？
本示例演示了如何读取 android 中的所有联系人
步骤 1 − 在 Android Studio 中创建一个新项目，依次转到文件 ⇒ 新建项目，并填写所有必需的详细信息来创建一个新项目。
步骤 2 − 将以下代码添加到 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>
在以上代码中，我们选取了列表视图。
步骤 3 − 将以下代码添加到 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;
}
}步骤 4 − 将以下代码添加到 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>
让我们尝试运行你的应用程序。我假设你已将你的实际 Android 移动设备连接到了你的计算机。要从 android studio 运行应用，请打开你的一个项目的活动文件，然后单击工具栏中的运行
图标。选择你的移动设备作为选项，然后检查你的移动设备，它将显示你的默认屏幕 -
更新于： 2019-7-30
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