編輯:關於Android編程
在Android上打印log時,我習慣已類名為tag,這樣在每一個類都得定義一個tag變量,然後又填入第一個參數,後來覺得很麻煩,在網上找到了一篇有用的博客,這個log類通過獲取調用所在的類名為tag進行打印,這樣就省了每次填第一個參數的煩惱了,方便了許多.原出處不知道在哪裡,這個我是轉載過來稍微修改的,下面貼上我修改過的源碼.修改AppConfig.DEBUG_MODEL的值就可以控制打印或者不打印了.
import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Formatter; import java.util.Locale; import android.os.Environment; import android.text.TextUtils; /** * Log工具,類似android.util.Log。 tag自動產生,格式: * customTagPrefix:className.methodName(Line:lineNumber), * customTagPrefix為空時只輸出:className.methodName(Line:lineNumber)。 * http://blog.csdn.net/finddreams * 復制的博客地址:http://blog.csdn.net/iplayvs2008/article/details/40422999 * 我調用另一個類轉換了,所以此類的類名可以為Log */ public class LogLazy { public static String customTagPrefix = "junjing"; // 自定義Tag的前綴,可以是作者名 private static final boolean isSaveLog = false; // 是否把保存日志到SD卡中 public static final String ROOT = Environment.getExternalStorageDirectory().getPath() + "/finddreams/"; // SD卡中的根目錄 private static final String PATH_LOG_INFO = ROOT + "info/"; private LogLazy() { } // 容許打印日志的類型,默認是true,設置為false則不打印 public static boolean allowD = true; public static boolean allowE = true; public static boolean allowI = true; public static boolean allowV = true; public static boolean allowW = true; public static boolean allowWtf = true; public static final boolean DEBUG = AppConfig.DEBUG_MODEL; private static String generateTag(StackTraceElement caller) { String tag = "%s.%s(Line:%d)"; // 占位符 String callerClazzName = caller.getClassName(); // 獲取到類名 callerClazzName = callerClazzName.substring(callerClazzName.lastIndexOf(".") + 1); callerClazzName = callerClazzName.substring(callerClazzName.lastIndexOf(".") + 1);// 我的修改,獲取倒數第二個類名,原因是我用另一個log輸出的. tag = String.format(tag, callerClazzName, caller.getMethodName(), caller.getLineNumber()); // 替換 tag = TextUtils.isEmpty(customTagPrefix) ? tag : customTagPrefix + ":" + tag; return tag; } /** * 自定義的logger */ public static CustomLogger customLogger; public interface CustomLogger { void d(String tag, String content); void d(String tag, String content, Throwable tr); void e(String tag, String content); void e(String tag, String content, Throwable tr); void i(String tag, String content); void i(String tag, String content, Throwable tr); void v(String tag, String content); void v(String tag, String content, Throwable tr); void w(String tag, String content); void w(String tag, String content, Throwable tr); void w(String tag, Throwable tr); void wtf(String tag, String content); void wtf(String tag, String content, Throwable tr); void wtf(String tag, Throwable tr); } public static void d(String content) { if (!DEBUG) return; if (!allowD) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.d(tag, content); } else { MyLog.d(tag, content); } } public static void d(String content, Throwable tr) { if (!DEBUG) return; if (!allowD) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.d(tag, content, tr); } else { MyLog.d(tag, content, tr); } } public static void e(String content) { if (!DEBUG) return; if (!allowE) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.e(tag, content); } else { MyLog.e(tag, content); } if (isSaveLog) { point(PATH_LOG_INFO, tag, content); } } public static void e(String content, Throwable tr) { if (!DEBUG) return; if (!allowE) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.e(tag, content, tr); } else { MyLog.e(tag, content, tr); } if (isSaveLog) { point(PATH_LOG_INFO, tag, tr.getMessage()); } } public static void i(String content) { if (!DEBUG) return; if (!allowI) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.i(tag, content); } else { MyLog.i(tag, content); } } public static void i(String content, Throwable tr) { if (!DEBUG) return; if (!allowI) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.i(tag, content, tr); } else { MyLog.i(tag, content, tr); } } public static void v(String content) { if (!DEBUG) return; if (!allowV) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.v(tag, content); } else { MyLog.v(tag, content); } } public static void v(String content, Throwable tr) { if (!DEBUG) return; if (!allowV) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.v(tag, content, tr); } else { MyLog.v(tag, content, tr); } } public static void w(String content) { if (!DEBUG) return; if (!allowW) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.w(tag, content); } else { MyLog.w(tag, content); } } public static void w(String content, Throwable tr) { if (!DEBUG) return; if (!allowW) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.w(tag, content, tr); } else { MyLog.w(tag, content, tr); } } public static void w(Throwable tr) { if (!DEBUG) return; if (!allowW) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.w(tag, tr); } else { MyLog.w(tag, tr); } } public static void wtf(String content) { if (!DEBUG) return; if (!allowWtf) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.wtf(tag, content); } else { MyLog.wtf(tag, content); } } public static void wtf(String content, Throwable tr) { if (!DEBUG) return; if (!allowWtf) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.wtf(tag, content, tr); } else { MyLog.wtf(tag, content, tr); } } public static void wtf(Throwable tr) { if (!DEBUG) return; if (!allowWtf) return; StackTraceElement caller = getCallerStackTraceElement(); String tag = generateTag(caller); if (customLogger != null) { customLogger.wtf(tag, tr); } else { MyLog.wtf(tag, tr); } } private static StackTraceElement getCallerStackTraceElement() { return Thread.currentThread().getStackTrace()[4]; } public static void point(String path, String tag, String msg) { if (isSDAva()) { Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("", Locale.SIMPLIFIED_CHINESE); dateFormat.applyPattern("yyyy"); path = path + dateFormat.format(date) + "/"; dateFormat.applyPattern("MM"); path += dateFormat.format(date) + "/"; dateFormat.applyPattern("dd"); path += dateFormat.format(date) + ".log"; dateFormat.applyPattern("[yyyy-MM-dd HH:mm:ss]"); String time = dateFormat.format(date); File file = new File(path); if (!file.exists()) createDipPath(path); BufferedWriter out = null; try { out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true))); out.write(time + " " + tag + " " + msg + "\r\n"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (out != null) { out.close(); } } catch (IOException e) { e.printStackTrace(); } } } } /** * 根據文件路徑 遞歸創建文件 * * @param file */ public static void createDipPath(String file) { String parentFile = file.substring(0, file.lastIndexOf("/")); File file1 = new File(file); File parent = new File(parentFile); if (!file1.exists()) { parent.mkdirs(); try { file1.createNewFile(); } catch (IOException e) { e.printStackTrace(); } } } /** * A little trick to reuse a formatter in the same thread */ private static class ReusableFormatter { private Formatter formatter; private StringBuilder builder; public ReusableFormatter() { builder = new StringBuilder(); formatter = new Formatter(builder); } public String format(String msg, Object... args) { formatter.format(msg, args); String s = builder.toString(); builder.setLength(0); return s; } } private static final ThreadLocalthread_local_formatter = new ThreadLocal () { protected ReusableFormatter initialValue() { return new ReusableFormatter(); } }; public static String format(String msg, Object... args) { ReusableFormatter formatter = thread_local_formatter.get(); return formatter.format(msg, args); } public static boolean isSDAva() { if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) || Environment.getExternalStorageDirectory().exists()) { return true; } else { return false; } } }
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