Use of Android log cat

Use of Android log cat

Android provides us with a log class, which has some methods such as

　　

We can add these methods to our code to test

1  Packagecom.example.test;2 3 Importandroid.app.Activity;4 ImportAndroid.os.Bundle;5 ImportAndroid.util.Log;6 ImportAndroid.view.Menu;7 ImportAndroid.view.MenuItem;8 9 Ten  Public classMainactivityextendsActivity { One     Private FinalString tag = "Mainactivity"; A @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); the Setcontentview (r.layout.activity_main); -          -        //System.out.println (1/0); -       +LOG.V (Tag, "I'm V"); -LOG.D (Tag, "I'm D"); +LOG.I (tag, "I Am I"); ALOG.W (tag, "I am w"); atLOG.E (Tag, "I'm E"); -System.out.println ("hehe"); -     } $}

Let's take a look at the information we get from the log cat.

　　

We can see the error message by the level of the log, generally look at the error level or the Warn level basically know where the error occurred, but you can also test the error by creating a log filter

That is, the small green plus sign on the top, when clicked, pops up a dialog box, such as

　　

When we look at the error message, we can click on the red box and select it to view it.

Use of Android log cat