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：