Android Log详解
<wbr> 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("","");</wbr>
<wbr> 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.</wbr>
<wbr> 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</wbr>
<wbr> 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。</wbr>
<wbr> 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。</wbr>
<wbr> 下面是我做的一个简单的LogDemo(Step By Step):</wbr>
Step 1:准备工作(打开LogCat视窗)．
<wbr> 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：</wbr>
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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)．
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Main.xml代码如下:
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
<wbr><wbr><wbr><wbr> android:id="@+id/bt" <br>
<wbr><wbr><wbr><wbr> android:layout_width="wrap_content" <br>
<wbr><wbr><wbr><wbr> android:layout_height="wrap_content" <br>
<wbr><wbr><wbr><wbr> android:text="Presse Me Look Log" <br><wbr><wbr><wbr><wbr><wbr><wbr> /> <br>
</LinearLayout> </wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
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Step 4:设计主类LogDemo.java,代码如下:
package com.android.test;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class LogDemo extends Activity
{
private static final String ACTIVITY_TAG="LogDemo";
<wbr><wbr><wbr> private Button bt; <br>
public void onCreate(Bundle savedInstanceState)</wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr> { <br> super.onCreate(savedInstanceState); <br> setContentView(R.layout.main); <br> //通过findViewById找到Button资源 <br> bt=(Button)findViewById(R.id.bt); <br> //增加事件响应 <br> bt.setOnClickListener(new Button.OnClickListener()</wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> { <br> <wbr><wbr><wbr><wbr><wbr><wbr> @Override <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> public void onClick(View v)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> { <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> Log.v(LogDemo.ACTIVITY_TAG, "This is Verbose."); <br> <wbr><wbr><wbr><wbr><wbr><wbr> <wbr><wbr><wbr> Log.d(LogDemo.ACTIVITY_TAG, "This is Debug."); <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Log.i(LogDemo.ACTIVITY_TAG, "This is Information"); <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Log.w(LogDemo.ACTIVITY_TAG, "This is Warnning."); <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> Log.e(LogDemo.ACTIVITY_TAG, "This is Error."); <br> <wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> } <br> }); <br> } <br> } </wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
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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:
本文转载自：http://blog.sina.com.cn/s/blog_8ae46d150101195q.html<wbr></wbr>