Android 日志含义

时间 : 15-11-09 栏目 : Android, 移动开发 作者 : noway 评论 : 0 点击 : 439 次

在调试代码的时候我们需要查看调试信息，那我们就需要用Android Log类。

android.util.Log常用的方法有以下5个：Log.v() Log.d() Log.i() Log.w() 以及 Log.e() 。根据首字母对应VERBOSE，DEBUG,INFO, WARN，ERROR。

1、Log.v 的调试颜色为黑色的，任何消息都会输出，这里的v代表verbose啰嗦的意思，平时使用就是Log.v("","");

2、Log.d的输出颜色是蓝色的，仅输出debug调试的意思，但他会输出上层的信息，过滤起来可以通过DDMS的Logcat标签来选择.

3、Log.i的输出为绿色，一般提示性的消息information，它不会输出Log.v和Log.d的信息，但会显示i、w和e的信息

4、Log.w的意思为橙色，可以看作为warning警告，一般需要我们注意优化Android代码，同时选择它后还会输出Log.e的信息。

5、Log.e为红色，可以想到error错误，这里仅显示红色的错误信息，这些错误就需要我们认真的分析，查看栈的信息了。

注意：不同的打印方法在使用时都是某个方法带上(String tag, String msg)参数，tag表示的是打印信息的标签，msg表示的是需要打印的信息。

下面是我做的一个简单的LogDemo(Step By Step):

Step 1:准备工作(打开LogCat视窗)．

启动Eclipse,在Window->Show View会出来一个对话框，当我们点击Ok按钮时，会在控制台窗口出现LogCat视窗.如下图：

Step 2:新建一个Android工程，命名为LogDemo.

Step 3:设计UI界面，我们在这里就加了一个Button按钮(点击按钮出现Log日志信息)．

Main.xml代码如下:

 

[xhtml] view plaincopy

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     android:orientation="vertical"
  4.     android:layout_width="fill_parent"
  5.     android:layout_height="fill_parent"
  6.     >
  7. <TextView
  8.     android:layout_width="fill_parent"
  9.     android:layout_height="wrap_content"
  10.     android:text="@string/hello"
  11.     />
  12. <Button
  13.  android:id="@+id/bt"
  14.  android:layout_width="wrap_content"
  15.  android:layout_height="wrap_content"
  16.  android:text="Presse Me Look Log"
  17. />
  18. </LinearLayout>

Step 4:设计主类LogDemo.java,代码如下:

[java] view plaincopy

  1. public class LogDemo extends Activity {
  3.  private static final String ACTIVITY_TAG="LogDemo";
  4.  private Button bt;
  5.     public void onCreate(Bundle savedInstanceState) {
  6.         super.onCreate(savedInstanceState);
  7.         setContentView(R.layout.main);
  8.         //通过findViewById找到Button资源
  9.         bt = (Button)findViewById(R.id.bt);
  10.         //增加事件响应
  11.         bt.setOnClickListener(new Button.OnClickListener(){
  12.     @Override
  13.    public void onClick(View v) {
  14.     Log.v(LogDemo.ACTIVITY_TAG, "This is Verbose.");
  15.     Log.d(LogDemo.ACTIVITY_TAG, "This is Debug.");
  16.     Log.i(LogDemo.ACTIVITY_TAG, "This is Information");
  17.     Log.w(LogDemo.ACTIVITY_TAG, "This is Warnning.");
  18.     Log.e(LogDemo.ACTIVITY_TAG, "This is Error.");
  19.    }
  21.         });
  22.     }
  24. }

Step 5:运行LogDemo工程，效果如下:

当我们点击按钮时，会触发事件，在Logcat视窗下有如下效果:

 

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