標籤：android 日誌 log
android 記錄檔輸出
用法：
try {
} catch (Exception e) {
LogUtil.LogException(e);
}
package com.hexun.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.io.StringWriter;
import android.os.Environment;
import android.util.Log;
/**
* 日誌列印
*/
public class LogUtil {
private static final String FILE_NAME = "/logs.txt";
private static Boolean MYLOG_SWITCH = true; // 記錄檔總開關
public static void i(String tag, String str) {
Log.i(tag, str.toString());
}
public static void LogException(Exception e) {
if (MYLOG_SWITCH) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
String str = sw.toString();
writeException(str);
} else {
e.printStackTrace();
}
}
private static void writeException(String content) {
try {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 擷取SD卡的目錄
File sdCardDir = Environment.getExternalStorageDirectory();
File targetFile = new File(sdCardDir.getCanonicalPath()
+ FILE_NAME);
// 以指定檔案建立RandomAccessFile對象
RandomAccessFile raf = new RandomAccessFile(targetFile, "rw");
// 將檔案記錄指標移動到最後
raf.seek(targetFile.length());
// 輸出檔案內容
raf.write(content.getBytes());
raf.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static String readException() {
try {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 獲得SD卡對應的儲存目錄
File sdCardDir = Environment.getExternalStorageDirectory();
// 擷取指定檔案對應的輸入資料流
FileInputStream fis = new FileInputStream(
sdCardDir.getCanonicalPath() + FILE_NAME);
// 將指定輸入資料流封裝成BufferReader
BufferedReader br = new BufferedReader(new InputStreamReader(
fis));
StringBuilder sb = new StringBuilder("");
String line = null;
// 迴圈讀取檔案內容
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
return sb.toString();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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android 記錄檔輸出
