How to print to the console in Android Studio?

问题:

I just downloaded Android Studio for Linux from: http://developer.android.com/sdk/installing/studio.html

I'm wondering how to print to the console?

Neither System.out.print(...) nor Log.e(...) from android.util.Log seem to work.

回答1:

Run your application in debug mode by clicking on

in the upper menu of Android Studio.

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

Now you should select the Logcat console.

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):

Check this article for more information.

回答2:

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

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

The main options are:

• DEBUG: Log.d
• ERROR: Log.e
• INFO: Log.i
• VERBOSE: Log.v
• WARN: Log.w

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

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".

回答3:

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

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

回答4:

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

See detailed answer with screenshot here

回答5:

If your app is launched from device, not IDE, you can do later in menu: Run - Attach Debugger to Android Process.

This can be useful when debugging notifications on closed application.