Android resolveContentProvider返回null

<uses-permission android:name="android.permission.READ_CONTACTS"/>

if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_CODE);
}

Uri uri = Uri.parse("content://com.example.provider/data");

<provider
    android:name=".MyContentProvider"
    android:authorities="com.example.provider"
    android:exported="true"/>

ContentResolver resolver = getContentResolver();
Cursor cursor = resolver.query(uri, null, null, null, null);
if (cursor != null) {
    // 处理数据
    cursor.close();
}

android {
    defaultConfig {
        targetSdkVersion 30
    }
}

Uri uri = Uri.parse("content://com.example.provider/data");
String authority = uri.getAuthority();
ContentProviderInfo providerInfo = getPackageManager().resolveContentProvider(authority, 0);

if (providerInfo != null) {
    // 内容提供者存在，可以进行操作
    ContentResolver resolver = getContentResolver();
    Cursor cursor = resolver.query(uri, null, null, null, null);
    if (cursor != null) {
        // 处理数据
        cursor.close();
    }
} else {
    // 内容提供者不存在，处理错误情况
    Log.e("ContentProvider", "无法找到指定的内容提供者");
}