Android内容提供器-读取通讯录
16lz
2021-01-25
要访问安卓手机里的通讯录、短信、媒体库等，要用内容提供器，要用到ContentResolver类，通过Context的getContentResolver()就可以获取到该实例，该实例可以增删查改。
测试小实例：
AndroidManifest.xml 配置用到的权限
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.contactstest"> <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> <uses-permission android:name="android.permission.READ_CONTACTS"/>manifest>activity_main.xml ListView布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_height="match_parent" android:layout_width="match_parent"> <ListView android:id="@+id/contacts_view" android:layout_width="match_parent" android:layout_height="match_parent"> ListView>LinearLayout>入口 MainActivity.java
package com.example.contactstest;import androidx.appcompat.app.AppCompatActivity;import androidx.core.app.ActivityCompat;import androidx.core.content.ContextCompat;import android.Manifest;import android.content.pm.PackageManager;import android.database.Cursor;import android.os.Bundle;import android.provider.ContactsContract;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { ArrayAdapter<String> adapter; List<String> contactsList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView contactsView = findViewById(R.id.contacts_view); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contactsList); contactsView.setAdapter(adapter); if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CONTACTS}, 1); } else { readContacts(); } } private void readContacts() { Cursor cursor = null; try { cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null); if (cursor != null) { while (cursor.moveToNext()) { String displayName = cursor.getString(cursor.getColumnIndex( ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); String number = cursor.getString(cursor.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER)); contactsList.add(displayName + "\n" + number); } adapter.notifyDataSetChanged(); } } catch (Exception e) { e.printStackTrace(); } finally { if (cursor != null) { cursor.close(); } } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantsResults) { switch (requestCode) { case 1: if(grantsResults.length > 0 && grantsResults[0] == PackageManager.PERMISSION_GRANTED) { readContacts(); } else { Toast.makeText(this, "您阻止了权限！", Toast.LENGTH_SHORT).show(); } break; default: } }}更多相关文章
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