Android将应用log信息保存文件

1package com.way.util;
2
3import java.io.BufferedReader;
4import java.io.File;
5import java.io.FileNotFoundException;
6import java.io.FileOutputStream;
7import java.io.IOException;
8import java.io.InputStreamReader;
9
10import android.content.Context;
11import android.os.Environment;
12
13/**
14 * log日志统计保存
15 * 
16 * @author way
17 * 
18 */
19
20public class LogcatHelper {
21
22	private static LogcatHelper INSTANCE = null;
23	private static String PATH_LOGCAT;
24	private LogDumper mLogDumper = null;
25	private int mPId;
26
27	/**
28	 * 
29	 * 初始化目录
30	 * 
31	 * */
32	public void init(Context context) {
33		if (Environment.getExternalStorageState().equals(
34				Environment.MEDIA_MOUNTED)) {// 优先保存到SD卡中
35			PATH_LOGCAT = Environment.getExternalStorageDirectory()
36					.getAbsolutePath() + File.separator + "miniGPS";
37		} else {// 如果SD卡不存在，就保存到本应用的目录下
38			PATH_LOGCAT = context.getFilesDir().getAbsolutePath()
39					+ File.separator + "miniGPS";
40		}
41		File file = new File(PATH_LOGCAT);
42		if (!file.exists()) {
43			file.mkdirs();
44		}
45	}
46
47	public static LogcatHelper getInstance(Context context) {
48		if (INSTANCE == null) {
49			INSTANCE = new LogcatHelper(context);
50		}
51		return INSTANCE;
52	}
53
54	private LogcatHelper(Context context) {
55		init(context);
56		mPId = android.os.Process.myPid();
57	}
58
59	public void start() {
60		if (mLogDumper == null)
61			mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
62		mLogDumper.start();
63	}
64
65	public void stop() {
66		if (mLogDumper != null) {
67			mLogDumper.stopLogs();
68			mLogDumper = null;
69		}
70	}
71
72	private class LogDumper extends Thread {
73
74		private Process logcatProc;
75		private BufferedReader mReader = null;
76		private boolean mRunning = true;
77		String cmds = null;
78		private String mPID;
79		private FileOutputStream out = null;
80
81		public LogDumper(String pid, String dir) {
82			mPID = pid;
83			try {
84				out = new FileOutputStream(new File(dir, "GPS-"
85						+ MyDate.getFileName() + ".log"));
86			} catch (FileNotFoundException e) {
87				// TODO Auto-generated catch block
88				e.printStackTrace();
89			}
90
91			/**
92			 * 
93			 * 日志等级：*:v , *:d , *:w , *:e , *:f , *:s
94			 * 
95			 * 显示当前mPID程序的 E和W等级的日志.
96			 * 
97			 * */
98
99			// cmds = "logcat *:e *:w | grep \"(" + mPID + ")\"";
100			// cmds = "logcat  | grep \"(" + mPID + ")\"";//打印所有日志信息
101			// cmds = "logcat -s way";//打印标签过滤信息
102			cmds = "logcat *:e *:i | grep \"(" + mPID + ")\"";
103
104		}
105
106		public void stopLogs() {
107			mRunning = false;
108		}
109
110		@Override
111		public void run() {
112			try {
113				logcatProc = Runtime.getRuntime().exec(cmds);
114				mReader = new BufferedReader(new InputStreamReader(
115						logcatProc.getInputStream()), 1024);
116				String line = null;
117				while (mRunning && (line = mReader.readLine()) != null) {
118					if (!mRunning) {
119						break;
120					}
121					if (line.length() == 0) {
122						continue;
123					}
124					if (out != null && line.contains(mPID)) {
125						out.write((MyDate.getDateEN() + "  " + line + "\n")
126								.getBytes());
127					}
128				}
129
130			} catch (IOException e) {
131				e.printStackTrace();
132			} finally {
133				if (logcatProc != null) {
134					logcatProc.destroy();
135					logcatProc = null;
136				}
137				if (mReader != null) {
138					try {
139						mReader.close();
140						mReader = null;
141					} catch (IOException e) {
142						e.printStackTrace();
143					}
144				}
145				if (out != null) {
146					try {
147						out.close();
148					} catch (IOException e) {
149						e.printStackTrace();
150					}
151					out = null;
152				}
153
154			}
155
156		}
157
158	}
159
160}
161
162<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
163    <uses-permission android:name="android.permission.READ_LOGS" />
164
165package com.way.util;
166
167import java.text.SimpleDateFormat;
168import java.util.Date;
169
170public class MyDate {
171	public static String getFileName() {
172		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
173		String date = format.format(new Date(System.currentTimeMillis()));
174		return date;// 2012年10月03日 23:41:31
175	}
176
177	public static String getDateEN() {
178		SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
179		String date1 = format1.format(new Date(System.currentTimeMillis()));
180		return date1;// 2012-10-03 23:41:31
181	}
182
183}

OK，所有事情做完之后，在我们的应用中start一下就OK了，使用完之后，记得调用一下stop：

1public class GPSApplication extends Application {
2
3	@Override
4	public void onCreate() {
5		// TODO Auto-generated method stub
6		LogcatHelper.getInstance(this).start();
7	}
8}