在碎片中使用吐司

我试图显示一个祝酒词时，用户点击一个按钮内的片段。问题是我无法访问这个活动来显示它上面的祝酒词。

下面是 Fragment的来源:

    public class FrgTimes extends Fragment
{
ScrollView sv;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
if (container == null) { return null; }


sv = (ScrollView)inflater.inflate(R.layout.frg_times, container, false);


btnTime1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {


//******  HERE's the PROBLEM  ********
Toast.makeText(<The Activity>, "Please long press the key", Toast.LENGTH_LONG );


}});


return sv;
}

这是我试过的方法。

Toast.makeText( getActivity()  , ...
Toast.makeText( getView().getContext()  , ...
Toast.makeText( getActivity().getApplicationContext()  , ...
Toast.makeText( sv.getContext()  , ...
Toast.makeText( sv.getRootView().getContext()  , ...

在调试中，我可以看到所有这些代码运行没有任何例外，但没有 TOAST被显示。

201977 次浏览
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最佳答案

You are not calling show() on the Toast you are creating with makeText().

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To help another people with my same problem, the complete answer to Use Toast inside Fragment is:

Activity activity = getActivity();


@Override
public void onClick(View arg0) {


Toast.makeText(activity,"Text!",Toast.LENGTH_SHORT).show();
}
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As stated by alfo888_ibg:

@Override
public void onClick(View arg0) {
Toast.makeText(activity,"Text!",Toast.LENGTH_SHORT).show();
}

Just do:

    Toast.makeText(getActivity(),"Text!",Toast.LENGTH_SHORT).show();

this worked for me.

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user2564789 said it right
But you can also use this in the place of getActivity()
which will make your toast look like this 


Toast.makeText(this,"Message",Toast.LENGTH_SHORT).show();

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When making a toast in fragment do as following:

Toast.makeText(getActivity(),"Message", Toast.LENGTH_SHORT).show();

When class is extending fragment it is necessary to use getActivity() since fragment is a subclass of activity.

Cheerse

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When calling Toast inside android fragment:

1. Activity mActivity=this.getActivity();


2. Toast.makeText(mActivity,"Text you want to display",Toast.LENGTH_SHORT).show();

This works for me.

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        public void onClick(View v) {
Context context = v.getContext();
CharSequence text = "Message";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
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Making a Toast inside Fragment 

 Toast.makeText(getActivity(), "Your Text Here!", Toast.LENGTH_SHORT).show();

OR

    Activity activityObj = this.getActivity();


Toast.makeText(activityObj, "Your Text Here!", Toast.LENGTH_SHORT).show();

OR

Toast.makeText(this, "Your Text Here!", Toast.LENGTH_SHORT).show();
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You can get the current activity with getActivity()

Toast.makeText(getActivity(),"Toast your message" ,Toast.LENGTH_SHORT).show();
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Unique Approach

(Will work for Dialog, Fragment, Even Util class etc...)

ApplicationContext.getInstance().toast("I am toast");

Add below code in Application class accordingly.

public class ApplicationContext extends Application {


private static ApplicationContext instance;


@Override
public void onCreate() {
super.onCreate();
instance = this;
}


public static void toast(String message) {
Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show();
}
}
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A simple [Fragment] subclass.
Kotlin!
contextA - is a parent (main) Activity. Set it on create object.

class Start(contextA: Context) : Fragment() {


var contextB: Context = contextA;


override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val fl = inflater.inflate(R.layout.fragment_start, container, false)


// only thet variant is worked on me
fl.button.setOnClickListener { view -> openPogodaUrl(view) }


return fl;
}


fun openPogodaUrl(view: View) {
try {
pogoda.webViewClient = object : WebViewClient() { // pogoda - is a WebView
override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean {
view?.loadUrl(url)
return true
}
}
pogoda.loadUrl("http://exemple.com/app_vidgets/pogoda.html");
}
catch (e: Exception)
{
Toast.makeText(contextB, e.toString(), Toast.LENGTH_LONG).show();
}
}

}

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Using Kotlin

Toast.makeText(view!!.context , "your_text", Toast.LENGTH_SHORT).show()
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If you are using kotlin then the context will be already defined in the fragment. So just use that context. Try the following code to show a toast message.

Toast.makeText(context , "your_text", Toast.LENGTH_SHORT).show()
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In Kotlin android Toast.makeText(activity!!, "Your Text Here!", Toast.LENGTH_SHORT).show()


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