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      1 page.title=Notepad Extra Credit
      2 parent.title=Notepad Tutorial
      3 parent.link=index.html
      4 @jd:body
      5 
      6 
      7 <p><em>In this exercise, you will use the debugger to look at the work you did
      8 in Exercise 3. This exercise demonstrates:</em></p>
      9 <ul>
     10 <li><em>How to set breakpoints to observe execution</em> </li>
     11 <li><em>How to run your application in debug mode</code></em></li>
     12 </ul>
     13 
     14 <div style="float:right;white-space:nowrap">
     15 
     16 	[<a href="notepad-ex1.html">Exercise 1</a>]
     17 	[<a href="notepad-ex2.html">Exercise 2</a>]
     18 	[<a href="notepad-ex3.html">Exercise 3</a>]
     19 	<span style="color:#BBB;">
     20 		[<a href="notepad-extra-credit.html" style="color:#BBB;">Extra Credit</a>]
     21 	</span>
     22 </div>
     23 
     24 <h2>Step 1</h2>
     25 
     26 <p>Using the working <code>Notepadv3</code>, put breakpoints in the code at the
     27     beginning of the <code>onCreate()</code>, <code>onPause()</code>,
     28     <code>onSaveInstanceState()</code> and <code>onResume()</code> methods in the
     29     <code>NoteEdit</code> class (if you are not familiar with Eclipse, just
     30     right click in the narrow grey border on the left of the edit window at the
     31     line you want a breakpoint, and select <em>Toggle Breakpoint</em>, you
     32 should see a blue dot appear).</p>
     33  
     34 <h2>Step 2</h2>
     35 
     36 <p>Now start the notepad demo in debug mode:</p>
     37 
     38 <ol type="a">
     39     <li>
     40       Right click on the <code>Notepadv3</code> project and from the Debug menu
     41       select <em>Debug As -&gt; Android Application.</em></li>
     42     <li>
     43       The Android emulator should say <em>"waiting for debugger to connect"</em>
     44       briefly and then run the application.</li>
     45   <li>
     46       If it gets stuck on the waiting... screen, quit the emulator and Eclipse,
     47       from the command line do an <code>adb kill-server</code>, and then restart
     48 Eclipse and try again.</li></ol>
     49       
     50       <h2>Step 3</h2>
     51 
     52 <p>When you edit or create a new note you should see the breakpoints getting
     53     hit and the execution stopping.</p>
     54     
     55     <h2>Step 4</h2>
     56 
     57 <p>Hit the Resume button to let execution continue (yellow rectangle with a
     58 green triangle to its right in the Eclipse toolbars near the top).</p>
     59 
     60 <h2>Step 5</h2>
     61 
     62 <p>Experiment a bit with the confirm and back buttons, and try pressing Home and
     63     making other mode changes. Watch what life-cycle events are generated and
     64 when.</p>
     65 
     66 <p>The Android Eclipse plugin not only offers excellent debugging support for
     67 your application development, but also superb profiling support. You can also
     68 try using <a href="{@docRoot}tools/help/traceview.html">Traceview</a> to profile your application. If your application is running too slow, this can help you 
     69 find the bottlenecks and fix them.</p>
     70 
     71