How do I make a toast from a non activity class?
I have a class that I am using to get GPS data within my activity. In the constructor I pass it the activity's context:
gpsFetcher = 开发者_高级运维new GPSFetcher(this);
and in the gpsFetcher class I have:
this.context = c.getApplicationContext();
OR just
this.context = c;
and then I call the toast with:
Toast.makeText(context, "sometext", Toast.LENGTH_LONG);
But it never shows up... Is there something I'm missing? Is it possible?
Thanks!
Are you forgetting Toast#show
?
Toast toast = Toast.makeText(context, "sometext", Toast.LENGTH_LONG);
toast.show();
You must call show()
as well:
Toast.makeText(context, "sometext", Toast.LENGTH_LONG).show();
I have met the same question but I solved it.!! In the non-activity class , you just announce a "public static String". Then in your MainActivity or other activity , you can directly use Toast.
In my case , I declare a non-activity class NoteDB. so I declare public static String S
in the class . (You can change S value in the class. Then in my MainActivity , I announce
Toast(MainActivity.this, NoteDB.S ,TOAST.SHORT_LENTGH).show();
It works well.
To display a Toast in a Non-Activity Java class, add the Context in the constructor of the java class
[Here PrizeMethods is my java class]
public class PrizeMethods {
Context context;
public PrizeMethods(Context context) {
this.context = context;
}
}
and where you are instancing this class in your activity (making an object of it, using it in your main activity), add the context as a parameter.
Like this:
PrizeMethods pm=new PrizeMethods(this);
after that inside your java class, you can create a toast like this:
Toast.makeText(context, "toast inside class!!", Toast.LENGTH_SHORT).show();
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