Question

How can know a screen opening from which screen. for example: screen1 and screen2 can go(intent) to screen3. in screen3 how to find user is coming from screen1 or screen2?

Thanks

Answer 1

Use putExtra() and getStringExtra() to solve your problem.
like

In Screen1 Activity write this code

 Intent intent = new Intent().setClass(Screen1.this, Screen3.class);
         intent.putExtra("caller", "Screen1");
         startActivity(intent);

In Screen2 Activity, write this code

 Intent intent = new Intent().setClass(Screen2.this, Screen3.class);
         intent.putExtra("caller", "Screen2");
         startActivity(intent);

And now on onCreate() of Screen3 Activity

String caller = this.getIntent().getStringExtra("caller");
        if(caller != null) {
            if("Screen1".equalsIgnoreCase(caller)) {
                Toast.makeText(this, "Called from screen 1", Toast.LENGTH_SHORT).show();
            } else if("Screen2".equalsIgnoreCase(caller)){
                Toast.makeText(this, "Called from screen 2", Toast.LENGTH_SHORT).show();
            }
        }

Hope this will clear…