Cannot resolve maketext() method of Toast

问题:

I am getting error while creating a Toast

Toast toast = Toast.makeText(this, text, duration); 

I am getting cannot resolve makeText() method of Toast.

I am getting this error

java: no suitable method found for makeText(idtech.ESDN.ShapeData,java.lang.CharSequence,int) method android.widget.Toast.makeText(android.content.Context,int,int) is not applicable (actual argument idtech.ESDN.ShapeData cannot be converted to android.content.Context by method invocation conversion) method android.widget.Toast.makeText(android.content.Context,java.lang.CharSequence,int) is not applicable (actual argument idtech.ESDN.ShapeData cannot be converted to android.content.Context by method invocation conversion)

回答1:

The makeText's signature is the following

public static Toast makeText (Context context, CharSequence text, int duration) 

the first paramter has to be a context object. You put this, but this refers to this object and it can be something different from an Activity (a Fragment for instance).

回答2:

this in your case might not be the object of the activity. You might be using the Toast.makeText method inside you Click Listener object. To resolve this you need to use getApplicationContext() :

Toast.makeText(getApplicationContext() , "Your Message", Toast.LENGTH_LONG);

回答3:

Have you imported the toast widget?

import android.widget.Toast; 

You can also call show() in the same line if you want to output it straight away:

Toast toast = Toast.makeText(context, text, duration).show(); 

Hope that helps.

回答4:

Make sure that you type: Toast toast = Toast.makeText(this, text, duration);

Not: Toast toast = new Toast.makeText(this, text, duration);

回答5:

Try Toast toast = Toast.makeText(getActivity(), text, duration);

You may also wish to append .show() if you want it to display

回答6:

In the onClick(View view) click listener within a RecyclerView.ViewHolder the context is retrieved with view.getContext(), as in:

```

public class MyHolder extends RecyclerView.ViewHolder implements  View.OnClickListener {      public MyHolder(View itemView) {         super(itemView);         //...         itemView.setOnClickListener(this);     }      @Override     public void onClick(View view) {         Toast.makeText(view.getContext(), "the message",              Toast.LENGTH_SHORT).show();     } 

```

回答7:

Toast.makeText(YourActivity.this, text, duration).show();

回答8:

If you are trying to Toast your text in the MainActivity then do this:

Toast.makeText(getApplicationContext(), "Your text", Toast.LENGTH_LONG).show(); 

回答9:

I have faced a similar problem but in my case i found out that Xamarin c# and Java in Android studio have differences when calling some functions(same functions).

When using Xamarin and c#, then makeText becomes MakeText and show becomes Show as shown below:

Toast toast = Toast.MakeText(this, "Text", ToastLength.Long); toast.Show(); 

Hope this helps:)

回答10:

This might be helpful if you are trying to use Toast in Fragment:

Toast.makeText(Your_Fragment_Name.super.getContext(), "Added", Toast.LENGTH_SHORT).show(); 

回答11:

I have faced similar problem in android studio, I resolve this issue by using getActivity() instead of this in the fragment

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

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