CODEWITHSUNDEEP
androidandroid-intent
San
San

Reputation: 2088

How to filter the intent for a certain activity

MainActivity.java :

    Intent intent = new Intent(MainActivity.this,Profile_view.class);
    intent.putExtra("user",username);
    startActivity(intent);

Profil_view : 

    Intent intent = this.getIntent();
    if(intent!=null)
    {
        String user = intent.getExtras().getString("user");
        Log.i("ProfileView",user);
        DBAdapter dbAdapter = new DBAdapter(Profile_view.this);
        dbAdapter.open();
        String name = dbAdapter.getName(user);
        full_name.setText(name);
        username_display.setText(dbAdapter.getUserName(user));
        mail_display.setText(dbAdapter.getMail_id(user));
        date_of_birth_display.setText(dbAdapter.get_date_of_birth(user));
        //country_display.setText(dbAdapter.get_country(user));
        dbAdapter.close();
    }

I have a situation here at which i register the user details and move to profile_view page to display it and similarly when i login at the main activity, it matches with the current username from the database and displays his user details in the profile_view page. So profile_view can be reached from both registration_page and main_activity.

The list of methods in profile_view should work for both registration page and main activity page but it cause of the intent from the main activity, it throws me a null pointer exception when i reach from registration page.

Upvotes: 0

Views: 76

Answers (3)

Hariharan
Hariharan

Reputation: 24853

There is an attribute named hasExtra() is available for Intent. You can make use of that to find out whether an extra is available for it or not.

Try this..

    Intent intent = this.getIntent();
    if(intent!=null)
    {
        if(intent.hasExtra("user"))
        {
             //It means that intent has an extra with tag name - "user".
             //So, it shows that the intent is from MainActivity
             //Do the necessary coding here

             String user = intent.getExtras().getString("user");
             Log.i("ProfileView",user);
             DBAdapter dbAdapter = new DBAdapter(Profile_view.this);
             dbAdapter.open();
             String name = dbAdapter.getName(user);
             full_name.setText(name);
             username_display.setText(dbAdapter.getUserName(user));
             mail_display.setText(dbAdapter.getMail_id(user));
             date_of_birth_display.setText(dbAdapter.get_date_of_birth(user));
             //country_display.setText(dbAdapter.get_country(user));
             dbAdapter.close();
        }
        else
        {
             //It means that intent doesn't have an extra with tag name - "user".
             //So, it shows that the intent is from RegisterActivity
             //Do the necessary coding here
        }
    }

description of hasExtra("")

Upvotes: 1

GrIsHu
GrIsHu

Reputation: 23638

Pass the string in intent from your mainactivity to identify that you are coming from MainActivity as below:

Intent intent = new Intent(MainActivity.this,Profile_view.class);
intent.putExtra("user",username);
 intent.putExtra("Activity","MainActivity");
startActivity(intent);

In your profileview activity check for the value as below:

Intent intent = this.getIntent();
String value= intent.getString("Activity");
if(intent!=null)
{
  if(value.equalsIgnoreCase("MainActivity"))
   {
     String user = intent.getExtras().getString("user");
    Log.i("ProfileView",user);
    DBAdapter dbAdapter = new DBAdapter(Profile_view.this);
    dbAdapter.open();
    String name = dbAdapter.getName(user);
    full_name.setText(name);
    username_display.setText(dbAdapter.getUserName(user));
    mail_display.setText(dbAdapter.getMail_id(user));
    date_of_birth_display.setText(dbAdapter.get_date_of_birth(user));
    //country_display.setText(dbAdapter.get_country(user));
    dbAdapter.close();
   }
     else{
         //Comes from Login activity
        }
  }

Upvotes: 2

Sagar Maiyad
Sagar Maiyad

Reputation: 12733

Just put one condition for checking value of intent like below:

Intent intent = this.getIntent();
    if(intent!=null)
    {
        if(intent.hasExtra("user"))
        {

           //Your Code


         }

     }

Upvotes: 2

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