Use of Context to Start Another Activity

Use of Context to start another Activity

Yes its different for different cases,

It depends on the scope. Suppose if you are creating a method in a global class that extends Application to create a Toast that is used in every class of your Application you can use getApplicationContext() to create it.

If you want to create a view that is restricted to that particular Activity you can use Activity.this

Also if you want to create an AlertDialog in some inner class say AsyncTask, then you have to use Activity.this, because the AlertDialog is to be linked to Activity itself.

Also don't use getBaseContext() just use the Context that you are having. For getting further information for the same you can see this Answer.

So, the answer to the real question is better to use Activity.this to start a new Activity.

Intent intent = new Intent(Current_Activity.this, Calling.class);
startActivity(intent);

Pass Context to another Activity

Create Object of The Helper class from your Activity and pass 'this' as the context, say

    MyHelperclass helper=new MyHelperclass(this);

In the Helper class Get this Context via its constructor

Context context;
MyHelperClass(Context context){
this.context=context;
}

Now You can pass this context to the makeText() method of Toast class.

how to start activity using context.startActivity(intent);...?

Try with this:

((Activity)context).startActivity(intent);  

How to get context of another activity which is not started yet ?

There's no point or advantage to doing this. Each Activity has its own lifecycle and its own version of Context which exists only for the activity's lifecycle.

How to pass context from activity to activity?

Extending the Application class helps you to allow declare/access global variables. You can set your variables from any activity to ApplicationContext and access it from other activity without using bundle.

How to declare global variables in Android? will help you.

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