从捆绑中获取参数 [英] Getting arguments from a bundle

问题描述

我正在尝试将Activity中的参数传递给Fragment，而我正在使用以下代码:

I'm trying to pass arguments from my Activity to a Fragment and I'm using this code:

@Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail);

        String message = getIntent().getStringExtra(Intent.EXTRA_TEXT);

        DetailActivityFragment fragment = new DetailActivityFragment();

        Bundle bundle = new Bundle();
        bundle.putString(INTENT_EXTRA, message);

        fragment.setArguments(bundle);
    }

我正在通过Intent Extra获取message变量的值，到目前为止，它仍然可以正常工作.
然后，我将其作为参数传递给片段，但是当我从该特定片段调用getArguments()时，它将返回一个空Bundle.
有人对此有解决方案吗?

I'm getting the value of the message variable through an Intent Extra and that works fine, so far.
Then I'm passing it as an argument to my fragment but then, when I call getArguments() from that specific Fragment it returns a null Bundle.
Does anybody have a solution to this?

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle bundle = getArguments();

        if (bundle != null && bundle.containsKey(DetailActivity.INTENT_EXTRA)) {
            forecast = bundle.getString(DetailActivity.INTENT_EXTRA);
        } else if (bundle == null) {
            Toast.makeText(getActivity(), "Error", Toast.LENGTH_LONG).show();
        }

    }

当我运行应用程序时，上部方法显示一条Toast消息错误" ...

The upper method displays a Toast message "Error" when I run the app...

推荐答案

这是正确的方法

发送(在活动中):

final FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

final DetailActivityFragment  frg = new DetailActivityFragment ();
ft.replace(R.id.container, frg);

final Bundle bdl = new Bundle();
bdl.putString("yourKey", "Some Value");
frg.setArguments(bdl);

ft.commit();

接收(在片段中):

final Bundle bdl = getArguments();

String str = "";
try
{
    str = bdl.getString("yourKey");
}
catch(final Exception e)
{
    // Do nothing
}

这篇关于从捆绑中获取参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！