android 程序日志记录

要加入权限

 <uses-permission android:name="android.permission.READ_LOGS" />

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.InputStreamReader;import java.text.SimpleDateFormat;import java.util.ArrayList;

import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;

public class Demo8Activity extends Activity implements OnClickListener { /** Called when the activity is first created. */ String filenameTemp = Environment.getExternalStorageDirectory().toString()+ "/app.txt";// 照片文件绝对路径 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btn = (Button) this.findViewById(R.id.button1); btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub//例子try{ int i=10/0;}catch(Exception e){Log.e("Android", e.getMessage());}Process mLogcatProc = null;BufferedReader reader = null;try{ mLogcatProc = Runtime.getRuntime().exec(new String[] {"logcat", "-d", "AndroidRuntime:E Android:V *:S" });//Android为你的Tag reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream())); String line; final StringBuilder log = new StringBuilder(); String separator = System.getProperty("line.separator");  while ((line = reader.readLine()) != null) { log.append(line); log.append(separator); } CreateText(); print(log.toString()); // do whatever you want with the log. I'd recommend using Intents to create an email}catch (IOException e){}finally{ if (reader != null) try { reader.close(); } catch (IOException e) { }}

} });    }  //创建文件夹及文件  public void CreateText() throws IOException {  File dir = new File(filenameTemp);  if (!dir.exists()) {  try {  //在指定的文件夹中创建文件  System.out.println(dir.createNewFile()+"---------------------");; } catch (Exception e) {  }  }  }   //向已创建的文件中写入数据  public void print(String str) {  FileWriter fw = null;  BufferedWriter bw = null;  String datetime = "";  try {  SimpleDateFormat tempDate = new SimpleDateFormat("yyyy-MM-dd" + " "  + "hh:mm:ss");  datetime = tempDate.format(new java.util.Date()).toString();  fw = new FileWriter(filenameTemp, true);//  // 创建FileWriter对象，用来写入字符流  bw = new BufferedWriter(fw); // 将缓冲对文件的输出  String myreadline = datetime + "[]" + str;   bw.write(myreadline + "\n"); // 写入文件  bw.newLine();  bw.flush(); // 刷新该流的缓冲  bw.close();  fw.close();  } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace();  try {  bw.close();  fw.close();  } catch (IOException e1) {  // TODO Auto-generated catch block  }  }  } @Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub}  /** * 监听退出事件 */ public boolean onKeyDown(int keyCode, KeyEvent event) {  if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {  // 确认对话框  final AlertDialog isExit = new AlertDialog.Builder(this).create();  // 对话框标题  isExit.setTitle("系统提示");  // 对话框消息  isExit.setMessage("确定要退出吗");  // 实例化对话框上的按钮点击事件监听  DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {  public void onClick(DialogInterface dialog, int which) {  switch (which) {  case AlertDialog.BUTTON1:// "确认"按钮退出程序  android.os.Process.killProcess(android.os.Process.myPid());  System.exit(0);  break;  case AlertDialog.BUTTON2:// "取消"第二个按钮取消对话框  isExit.cancel();  break;  default:  break;  }  }  };  // 注册监听  isExit.setButton("确定", listener);  isExit.setButton2("取消", listener);  // 显示对话框  isExit.show();  return false;  }  return false;  }

日志输出到文件是

：
2012-02-28 05:06:00[]--------- beginning of /dev/log/system--------- beginning of /dev/log/mainE/AndroidRuntime(22045): divide by zero
关于logcat 命令的用法可以查看

http://developer.android.com/guide/developing/tools/adb.html#usinglogcat

Here's an example of a filter expression that suppresses all log messages except those with the tag "ActivityManager", at priority "Info" or above, and all log messages with tag "MyApp", with priority "Debug" or above:

adb logcat ActivityManager:I MyApp:D *:S

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