Passing data between activities in Android

In Android is simple to run one activity from other. But what if you need to send data to the new activity. You can use several ways,for example DB,preferences,file system or just use Bundle. Last one is very useful in practice and I will show how to do this.
For this operation need 2 classes.
At first Intent
At second Bundle

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 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.