11. Android框架和工具之 Logger（调试代码）

1. Logger

Logger是android是一个简单、漂亮、功能强大的Android日志程序。

日志程序提供了 :

• 线程信息Thread information
• 类信息Class information
• 方法信息Method information
• 漂亮打印的JSON内容Pretty-print for json content
• Clean output
• Jump to source feature

Gradle

　　compile 'com.orhanobut:logger:1.3'

2. 使用Logger，如下：

 package com.himi.loggerdemo;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;

 import org.json.JSONException;
 import org.json.JSONObject;
 import org.json.JSONStringer;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlSerializer;

 import com.orhanobut.logger.Logger;

 import android.app.Activity;
 import android.os.Bundle;
 import android.util.Log;
 import android.util.Xml;

 public class MainActivity extends Activity {

     private static final String TAG = "MainActivity";

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         Log.d(TAG, "from Log");

         // 必须初始化Logger,不然会空指针
         Logger.init("myLogger");

         Logger.d("from Logger");
         Logger.e("hello");
         Logger.w("hello");
         Logger.v("hello");

         Logger.wtf("hello");

         // 生成一个JSON数据
         JSONObject json = new JSONObject();
         try {
             json.put("title", "book1").put("price", "$11");
             Logger.json(json.toString());
         } catch (JSONException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

         // 生成一个xml数据
         try {
             File file = new File(getFilesDir(), "data.xml");
             FileOutputStream os = new FileOutputStream(file);

             XmlSerializer serializer = Xml.newSerializer();

             serializer.setOutput(os, "utf-8");
             serializer.startDocument("utf-8", true);
             serializer.startTag(null, "student");
             serializer.startTag(null, "name");
             serializer.text("hebao");
             serializer.endTag(null, "name");
             serializer.startTag(null, "num");
             serializer.text("24");
             serializer.endTag(null, "num");

             serializer.endTag(null, "student");
             serializer.endDocument();
             os.close();

             XmlPullParser parser = Xml.newPullParser();
             // 2.设置解析器的参数
             InputStream inputStream = new FileInputStream(file);
             parser.setInput(inputStream, "utf-8");
             int type = parser.getEventType();
             StringBuilder sb = new StringBuilder();
             while (type != XmlPullParser.END_DOCUMENT) {
                 switch (type) {
                 case XmlPullParser.START_TAG:
                     if ("name".equals(parser.getName())) {
                         // 这是name节点
                         String name = parser.nextText();
                         sb.append("--name:" + name);
                     } else if ("num".equals(parser.getName())) {
                         // 这是name节点
                         String num = parser.nextText();
                         sb.append("--num:" + num);
                     }
                     break;
                 }
                 type = parser.next();// 让解析器解析下一个元素
             }
             inputStream.close();
             String text = sb.toString();

             Logger.xml(text);

         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IllegalArgumentException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IllegalStateException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (XmlPullParserException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

     }

 }

查看Logcat，如下：