Java 如何分析我的 Android 应用程序？
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How can I profile my Android app?
提问by teedyay
I need to find where the bottlenecks are in my Android app.
我需要找到我的 Android 应用程序中的瓶颈在哪里。
What profiling tools or techniques can I use?
我可以使用哪些分析工具或技术？
采纳答案by cement
You can use Traceview. It is far from ideal, but works. This articledescribes how to use it.
您可以使用跟踪视图。它远非理想，但有效。 本文介绍如何使用它。
回答by Shahul3D
回答by David
It depends what're you going to test.
这取决于你要测试什么。
In case you develop applications for Android you should try out the TimingLogger class. Take a look at this articledescribing the usage of the TimingLogger helper class.
如果您为 Android 开发应用程序，您应该尝试使用 TimingLogger 类。看看这篇文章，描述了 TimingLogger 助手类的用法。
A very good tool is JMeterand there is a plugin for Androidas well.
一个非常好的工具是JMeter，还有一个适用于 Android的插件。
if you don't want to use external tools, but a very standard way, to measure elapsed time, you must use System.nanoTime(). You shouldn't use currentTimeMillis, because it measures wall-clock time ans, as no computer's clock is perfect (them all occasionally needs to be corrected) there's a process that runs and continually issues small corrections to the system clock. Not to mention the leap second correction.
如果您不想使用外部工具，而是一种非常标准的方法来测量经过的时间，则必须使用 System.nanoTime()。您不应该使用 currentTimeMillis，因为它测量挂钟时间，因为没有计算机的时钟是完美的（它们偶尔都需要更正），有一个进程会运行并不断向系统时钟发出小的更正。更不用说闰秒校正了。
Although currentTimeMillis is often used, it's still incorrect to measure elapsed time and timing. Anyhow, as the invocation takes some time, you should not expect to correctly time very very small intervals. But that shouldn't be an issue working with Android.
尽管经常使用 currentTimeMillis，但测量经过的时间和计时仍然是不正确的。无论如何，由于调用需要一些时间，因此您不应期望正确计时非常非常小的时间间隔。但这不应该是与 Android 一起使用的问题。
I'll show you an example:
我给你看一个例子：
long startTime = System.nanoTime();
// run/call the method
long endTime = System.nanoTime();
long diff = endTime - startTime ;
System.out.println("Elapsed milliseconds: " + diff /1000000);
You could have a look at this free library as well: http://jetm.void.fm/.
你也可以看看这个免费库：http: //jetm.void.fm/。
You can also find tutorial for JMeteras well.
您还可以找到JMeter 的教程。
回答by Erhannis
Another tool recommended in http://developer.android.com/training/articles/perf-tips.htmlis Caliper: https://code.google.com/p/caliper/. (I haven't used it, so I don't know much about it.)
http://developer.android.com/training/articles/perf-tips.html 中推荐的另一个工具是 Caliper：https: //code.google.com/p/caliper/。（我没用过，所以不太了解。）
