Android捕捉崩潰日志并輸出日志文件

當程序與運行時發(fā)生崩潰，可以捕捉到當前崩潰的日志信息并寫入文件保存到指定的目錄下。這里還做了最大文件數(shù)量限制，超過數(shù)量即刪除舊日志文件。

import java.io.BufferedReader; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.StringWriter; import java.io.Writer; import java.lang.Thread.UncaughtExceptionHandler; import java.lang.reflect.Field; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Comparator; import java.util.Date; import java.util.HashMap; import java.util.Map;import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.os.Build; import android.os.Environment; import android.os.Looper; import android.util.Log; import android.widget.Toast;/*** UncaughtException處理類,當程序發(fā)生Uncaught異常的時候,有該類來接管程序,并記錄發(fā)送錯誤報告.* 需要在Application中注冊，為了要在程序啟動器就監(jiān)控整個程序。* fenghaitao*/ public class CrashHandler implements UncaughtExceptionHandler {public static final String TAG = "CrashHandler";//系統(tǒng)默認的UncaughtException處理類private Thread.UncaughtExceptionHandler mDefaultHandler;//CrashHandler實例private static CrashHandler instance;//程序的Context對象private Context mContext;//用來存儲設(shè)備信息和異常信息private Map<String, String> infos = new HashMap<String, String>();//用于格式化日期,作為日志文件名的一部分private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");//日志文件存儲路徑private String path = "/mnt/sdcard/crash/";//最大文件數(shù)量，超過數(shù)量即刪除舊日志文件private int limitLogCount = 50;/** 保證只有一個CrashHandler實例 */private CrashHandler() {}/** 獲取CrashHandler實例 ,單例模式 */public static CrashHandler getInstance() {if(instance == null)instance = new CrashHandler();return instance;}/*** 初始化*/public void init(Context context) {mContext = context;//獲取系統(tǒng)默認的UncaughtException處理器mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();//設(shè)置該CrashHandler為程序的默認處理器Thread.setDefaultUncaughtExceptionHandler(this);}/*** 當UncaughtException發(fā)生時會轉(zhuǎn)入該函數(shù)來處理*/@Overridepublic void uncaughtException(Thread thread, Throwable ex) {if (!handleException(ex) && mDefaultHandler != null) {//如果用戶沒有處理則讓系統(tǒng)默認的異常處理器來處理mDefaultHandler.uncaughtException(thread, ex);} else {try {Thread.sleep(3000);} catch (InterruptedException e) {Log.e(TAG, "error : ", e);}//退出程序android.os.Process.killProcess(android.os.Process.myPid());System.exit(1);}}/*** 自定義錯誤處理,收集錯誤信息 發(fā)送錯誤報告等操作均在此完成.** @param ex* @return true:如果處理了該異常信息;否則返回false.*/private boolean handleException(Throwable ex) {if (ex == null) {return false;}//收集設(shè)備參數(shù)信息collectDeviceInfo(mContext);//使用Toast來顯示異常信息new Thread() {@Overridepublic void run() {Looper.prepare()Toast.makeText(mContext, "很抱歉,程序出現(xiàn)異常,即將退出.", Toast.LENGTH_SHORT).show();Looper.loop();}}.start();//控制日志文件數(shù)量limitAppLogCount();//保存日志文件saveCatchInfo2File(ex);return true;}/*** 收集設(shè)備參數(shù)信息* @param ctx*/public void collectDeviceInfo(Context ctx) {try {PackageManager pm = ctx.getPackageManager();PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);if (pi != null) {String versionName = pi.versionName == null ? "null" : pi.versionName;String versionCode = pi.versionCode + "";infos.put("versionName", versionName);infos.put("versionCode", versionCode);}} catch (NameNotFoundException e) {Log.e(TAG, "an error occured when collect package info", e);}Field[] fields = Build.class.getDeclaredFields();for (Field field : fields) {try {field.setAccessible(true);infos.put(field.getName(), field.get(null).toString());Log.d(TAG, field.getName() + " : " + field.get(null));} catch (Exception e) {Log.e(TAG, "an error occured when collect crash info", e);}}}/*** 保存錯誤信息到文件中** @param ex* @return 返回文件名稱,便于將文件傳送到服務(wù)器*/private String saveCatchInfo2File(Throwable ex) {StringBuffer sb = new StringBuffer();for (Map.Entry<String, String> entry : infos.entrySet()) {String key = entry.getKey();String value = entry.getValue();sb.append(key + "=" + value + "\n");}Writer writer = new StringWriter();PrintWriter printWriter = new PrintWriter(writer);ex.printStackTrace(printWriter);Throwable cause = ex.getCause();while (cause != null) {cause.printStackTrace(printWriter);cause = cause.getCause();}printWriter.close();String result = writer.toString();sb.append(result);try {long timestamp = System.currentTimeMillis();String time = formatter.format(new Date());//日志文件名稱String fileName = "crash-" + time + "-" + timestamp + ".txt";if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File dir = new File(path);if (!dir.exists()) {dir.mkdirs();}FileOutputStream fos = new FileOutputStream(path + fileName);fos.write(sb.toString().getBytes());//發(fā)送給開發(fā)人員sendCrashLog2PM(path+fileName);fos.close();}return fileName;} catch (Exception e) {Log.e(TAG, "an error occured while writing file...", e);}return null;}/*** 將捕獲的導(dǎo)致崩潰的錯誤信息發(fā)送給開發(fā)人員** 目前只將log日志保存在sdcard 和輸出到LogCat中，并未發(fā)送給后臺。*/private void sendCrashLog2PM(String fileName){if(!new File(fileName).exists()){Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();return;}FileInputStream fis = null;BufferedReader reader = null;String s = null;try {fis = new FileInputStream(fileName);reader = new BufferedReader(new InputStreamReader(fis, "GBK"));while(true){s = reader.readLine();if(s == null) break;//由于目前尚未確定以何種方式發(fā)送，所以先打出log日志。//TODO 發(fā)送文件到服務(wù)器Log.i("info", s.toString());}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{ // 關(guān)閉流try {reader.close();fis.close();} catch (IOException e) {e.printStackTrace();}}}/*** 最大文件數(shù)量*/private void limitAppLogCount() {try {File file = new File(path);if (file != null && file.isDirectory()) {File[] files = file.listFiles(new CrashLogFliter());if(files != null && files.length >0) { // Arrays.sort(files, comparator);if (files.length > limitLogCount) {for (int i = 0 ; i < files.length - 1 ;i++) {files[i+1].delete();}}}}}catch (Exception e) {Log.e(TAG, "limitAppLogCount - "+e.getMessage());}}/*** 日志文件按日志大小排序*/private Comparator<File> comparator = new Comparator<File>() {@Overridepublic int compare(File l, File r) {if (l.lastModified() > r.lastModified())return 1;if (l.lastModified() < r.lastModified())return -1;return 0;}};/*** 過濾.txt的文件*/public class CrashLogFliter implements FileFilter {@Overridepublic boolean accept(File file) {if (file.getName().endsWith(".txt"))return true;return false;}} }

讀寫權(quán)限不要忘記添加，這里不多說。另外，還需要在Application類的onCreate()方法中進行初始化，代碼如下：

CrashHandler.getInstance().init(getApplicationContext());

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