Android8.0 适配ContentResolver解决java.lang.SecurityException: Failed to find provider null for user 0;

对于没有适配Android8.0+的设备在使用ContenResolver时会出现java.lang.SecurityException: Failed to find provider null for user 0; expected to find a valid ContentProvider for this authority的异常.

原因是在8.0以后,需要使用一个定义的应用内的ContentProvider来防止来自恶意应用的内容变更,以及私密数据泄露.

适配方法:

1.新建一个XXContentProvider继承自ContentProvider

2.在AndroidManifest.xml中声明该provider,并指定authority

3.在使用notifyChange和registerContentObserver时,需要将此前的Uri加上authority

如下:

      <providerandroid:authorities="Demo"android:name=".dao.offline.DbContentProvider"android:enabled="true"android:exported="false"/>

public class DbContentProvider extends ContentProvider {
?private static final String AUTHORITY = "Demo";private static final String SCHEME = "content";
?@Overridepublic boolean onCreate() {return true;}
?public static Uri getUri(String dbName) {return new Uri.Builder().authority(AUTHORITY).path(AppConstant.getDBPath() + File.separator + dbName).scheme(SCHEME).build();}
}

使用:

context.getContentResolver().registerContentObserver(DbContentProvider.getUri("YouDbName"), true, mDBObserver);