如何在AndroidStudio中打印到控制台?-HowtoprinttotheconsoleinAndroidStudio?

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Run your application in debug mode by clicking on

通过单击，在调试模式下运行您的应用程序。

in the upper menu of Android Studio.

在Android Studio的上菜单。

In the bottom status bar, click 5: Debug button, next to the 4: Run button.

在底部的状态栏中，单击5:Debug按钮，然后单击4:Run按钮。

Now you should select the Logcat console.

现在应该选择Logcat控制台。

In search box, you can type the tag of your message, and your message should appear, like in the following picture (where the tag is CREATION):

在search框中，您可以键入您的消息的标记，您的消息应该出现，如下图所示(其中标记正在创建):

Check this article for more information.

更多信息请参阅本文。

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Android has its own method of printing messages (called logs) to the console, known as the LogCat.

Android有自己的将消息(称为日志)打印到控制台的方法，称为LogCat。

When you want to print something to the LogCat, you use a Log object, and specify the category of message.

当您想要打印一些东西给LogCat时，您使用一个日志对象，并指定消息的类别。

The main options are:

主要的选项是:

• DEBUG: Log.d
• 调试:Log.d
• ERROR: Log.e
• 错误:Log.e
• INFO: Log.i
• 信息:Log.i
• VERBOSE: Log.v
• 详细:Log.v
• WARN: Log.w
• 警告:Log.w

You print a message by using a Log statement in your code, like the following example:

您可以在代码中使用日志语句打印消息，如下例所示:

Log.d("myTag", "This is my message");

Within Android Studio, you can search for log messages labelled myTag to easily find the message in the LogCat. You can also choose to filter logs by category, such as "Debug" or "Warn".

在Android Studio中，您可以搜索标记为myTag的日志消息，以便在LogCat中轻松找到消息。您还可以选择按类别筛选日志，如“Debug”或“Warn”。

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If the above solutions don't work, you can always see the output in the Android Monitor.

如果上面的解决方案不起作用，您可以在Android监视器中看到输出。

Make sure to set your filter to Show only selected application or create a custom filter.

请确保设置您的筛选器以只显示选定的应用程序或创建自定义筛选器。

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You can see the println statements in Run window in Android Studio. so you can see the prinln statements in that window.

您可以在Android Studio的运行窗口中看到println语句。你可以在那个窗口中看到prinln语句。

See detailed answer with screenshot here

详情请见这里的截图