Logcat and logcat do not display information

Logcat and logcat do not display information
Logcat

I. Introduction

Very useful log tools

 

Ii. Common Operations

1. Select logs of the corresponding level

2. Add a LOG filter.

 

Iii. code example

Create a log filter

 

The following code runs the log results

Com. fry. logcatTest. MainActivity

1 package com. fry. logcatTest; 2 3 4 5 6 7 import android. app. activity; 8 import android. content. intent; 9 import android. OS. bundle; 10 import android. util. log; 11 import android. view. view; 12 import android. view. view. onClickListener; 13 import android. widget. button; 14 15 16 17 public class MainActivity extends Activity {18 protected void onCreate (Bundle savedInstanceState) {19 super. onCreate (savedInstanceState); // action of the parent class 20 setContentView (R. layout. activity_main); // introduce the interface named activity_main.21 Log. v ("MainActivity", "v"); 22 Log. d ("MainActivity", "d"); 23 Log. I ("MainActivity", "I"); 24 Log. w ("MainActivity", "w"); 25 Log. e ("MainActivity", "e ");26} 27}