we can check whether intent.putExtras(key,value) has done or not?
<p>I am working on android. i want to know that whether this is possible to check that 
following key,value pair has created or not ?</p>

<pre><code>String filename=getIntent().getExtras().getString("FILE_NAME");
textView_file_name=(TextView)findViewById(R.id.TextView_fileName);
textView_file_name.setText(filename);
</code></pre>

<p>before my first programing statement, means before getting the value of <code>FILE_NAME</code>, i want to check whether this key-value pair has build or not ? because i am getting null pointer exception in the case if it is not done before these statement. So i want to know that is any code so i can check <code>intent.putExtras().getString("FILE_NAME");</code> has done or not.</p>
