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:
}
}
}