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page.title=Debugging Tips
@jd:body
<p>While debugging, keep these helpful tips in mind to help you figure out common problems with your
applications:</p>
<dl>
<dt><strong>Dump the stack trace</strong></dt>
<dd>To obtain a stack dump from emulator, you can log
in with <code>adb shell</code>, use <code>ps</code> to find the process you
want, and then <code>kill -3</code>. The stack trace appears in the log file.
</dd>
<dt><strong>Display useful info on the emulator screen</strong></dt>
<dd>The device can display useful information such as CPU usage or highlights
around redrawn areas. Turn these features on and off in the developer settings
window as described in <a href="{@docRoot}guide/developing/debugging/debugging-devtools.html">
Debugging with the Dev Tools App</a>.
</dd>
<dt><strong>Get application and system state information from the emulator</strong></dt>
<dd>You can access dumpstate information from the <code>adb shell</code> commands. See
<a href="{@docRoot}guide/developing/tools/adb.html#dumpsys">dumpsys and
dumpstate</a> on the adb topic page.</dd>
<dt><strong>Get wireless connectivity information</strong></dt>
<dd>You can get information about wireless connectivity using DDMS.
From the <strong>Device</strong> menu, select <strong>Dump
radio state</strong>.</dd>
<dt><strong>Log trace data</strong></dt>
<dd>You can log method calls and other tracing data in an activity by calling
{@link android.os.Debug#startMethodTracing(String) startMethodTracing()}. See <a
href="{@docRoot}guide/developing/debugging/debugging-tracing.html">Profiling with Traceview and
dmtracedump</a> for details. </dd>
<dt><strong>Log radio data</strong></dt>
<dd>By default, radio information is not logged to the system (it is a lot of
data). However, you can enable radio logging using the following commands:
<pre class="no-pretty-print">
adb shell
logcat -b radio
</pre>
</dd>
<dt><strong>Capture screenshots</strong></dt>
<dd>The Dalvik Debug Monitor Server (DDMS) can capture screenshots from the emulator. Select
<strong>Device > Screen capture</strong>.</dd>
<dt><strong>Use debugging helper classes</strong></dt>
<dd>Android provides debug helper classes such as {@link android.util.Log
util.Log} and {@link android.os.Debug} for your convenience. </dd>
</dl>
<p>See the <a href="{@docRoot}resources/faq/troubleshooting.html">Troubleshooting</a> document
for answers to some common developing and debugging issues.</p>
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