Passing data between activities in Android

Passing data between activities in Android

Example:

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
Bundle b = new Bundle();

b.putInt("key", 1);

intent.putExtras(b);

startActivity(intent);

finish();

There are 2 method which are interesting.

First method is

b.putInt("value", 1);

This method puts in Bundle key “key” and its value 1. Bundle class has a lof of put* methods.

Second method is:

intent.putExtras(b);

This method puts our bundle in Intent which starts new activity.

Now need to get passed data on new SecondActivity.

This process is also simple

Bundle b = getIntent().getExtras();

int value = b.getInt("key", 0);

First method gets needed Bundle.

Second method gets our data. As you can see there is second parameter “0″. It is default value. In situation when Bundle doesn’t contains data you will receive “0″ (default value).

I hope it was useful for you.