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copied!<p>If you want to profile your application to find performance bottlenecks you can <a href="https://developer.android.com/studio/profile/traceview.html" rel="nofollow noreferrer">use the <code>traceview</code> tool</a>. This gives you a graphical view of performance traces of your application.</p> <p><a href="https://content.screencast.com/users/davweb/folders/Snagit/media/03df8bcc-606c-4ebb-8330-ab206ae30099/12.24.2009-08.57.51.png" rel="nofollow noreferrer" title="Click for full size"><img src="https://content.screencast.com/users/davweb/folders/Snagit/media/03df8bcc-606c-4ebb-8330-ab206ae30099/12.24.2009-08.57.51.png" width="300"></a></p> <p>To create a trace add the following to your code where you want to start tracing:</p> <pre><code>Debug.startMethodTracing("myapp"); </code></pre> <p>and then put the following when you want to stop tracing:</p> <pre><code>Debug.stopMethodTracing(); </code></pre> <p>This will create a trace file call <code>myapp.trace</code> in the root directory of the SD Card. As it is written to the SD Card:</p> <ul> <li>If you're using the emulator you'll need to <a href="https://stackoverflow.com/questions/1952345/how-do-i-simulate-that-the-emulator-has-as-an-sd-card/1952358#1952358">add an SD card to your AVD</a>.</li> <li><p>You'll need to give you app permission to write the SD card by adding the following to your Manifest:</p> <p><code><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /></code></p></li> </ul> <p>Once the file has been created you'll need to copy it to your PC. You can do this using the <code>adb</code> command:</p> <pre><code>adb pull /sdcard/myapp.trace c:/my/dir/myapp.trace </code></pre> <p>Finally, start <code>traceview</code> giving it the <strong>full path</strong> to the trace file:</p> <pre><code>traceview c:/my/dir/myapp.trace </code></pre> <p>I did have some problems with <code>traceview</code> failing with <code>OutOfMemory</code> exceptions. I fixed this on Windows by changing the last line of <code>traceview.bat</code> from:</p> <pre><code>call java -Djava.ext.dirs=%javaextdirs% -Dcom.android.traceview.toolsdir= -jar %jarpath% %* </code></pre> <p>to:</p> <pre><code>call java -Xmx1g -Djava.ext.dirs=%javaextdirs% -Dcom.android.traceview.toolsdir= -jar %jarpath% %* </code></pre> <p>Adding the <code>-Xmx1g</code> option allows <code>traceview</code> to use more memory.</p>

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