小编Har*_*att的帖子

我正在使用以下代码在Facebook上分享链接.当用户在"共享"对话框界面上单击"取消"时,有时会调用onSuccess()回调方法而不是onCancel().并获得post id null.请帮我解决问题？

ShareButton btn;
CallbackManager callbackManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(this);
    callbackManager = CallbackManager.Factory.create();
    setContentView(R.layout.activity_share);

    btn = (ShareButton) findViewById(R.id.btn_share);

    btn.registerCallback(callbackManager, new FacebookCallback<Sharer.Result>() {
        @Override
        public void onSuccess(Sharer.Result result) {
            Log.e("Tag","Successfully posted");
            Log.e("Post id",result.getPostId());
        }

        @Override
        public void onCancel() {

            Log.e("Tag","Canceled by user");

        }

        @Override
        public void onError(FacebookException error) {

            Log.e("Tag",error.getLocalizedMessage());
        }
    });
    ShareLinkContent content = new ShareLinkContent.Builder()
            .setContentUrl(Uri.parse("My Custom URL"))
            .setContentTitle("Test")
            .build();

    btn.setShareContent(content);

}

@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) …

我是android领域的新手.我正在使用以下代码从领域获取产品对象.

ProductModel prodObj = realm.where(ProductModel.class).equalTo("product_id","12").findFirst();

如何创建prodObj的独立副本？我想更新一些不应该影响领域数据库的字段值.我不想用setter方法手动设置它,因为模型类包含太多字段.有没有简单的方法来创建prodObj的独立副本？

如何清除android中的默认域数据库？我尝试了下面的代码,但无法解析方法deleteRealmFile.

方法1:

try {
   Realm.deleteRealmFile(context);
  //Realm file has been deleted.

} catch (Exception ex){
   ex.printStackTrace();
  //No Realm file to remove.
}

我试图删除使用配置.

方法2:

try {
     Realm.deleteRealm(realm.getConfiguration());
     //Realm file has been deleted.
} catch (Exception ex){
     ex.printStackTrace();
     //No Realm file to remove.
}

但是给出了错误:

java.lang.IllegalStateException: It's not allowed to delete the file associated with an open Realm. Remember to close() all the instances of the Realm before deleting its file.