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

// 調用該方法造成異常
private void math() {
 try {
  int a = 0;
  int b = 10;
  int c = b / a;
 } catch (Exception e) {
  e.printStackTrace(); // Logcat打印異常

  // 保存異常信息
  StringWriter sw = new StringWriter();
  e.printStackTrace(new PrintWriter(sw, true));
  saveException(this, sw.toString());
 }
 }

 /**
 * 保存異常信息到本地 Android/data/包名/files/Documents/exception/yyyyMMdd_app_exception.txt
 * @param context 上下文
 * @param errMsg 異常信息
 */
 private void saveException(Context context, String errMsg) {
 if (context == null || TextUtils.isEmpty(errMsg)) return;
 FileOutputStream fos = null;
 try {
  // 創(chuàng)建目錄
  String dirPath = context.getExternalFilesDir(Environment.DIRECTORY_DOCUMENTS).getPath() + "/exception/";
  File dir = new File(dirPath);
  if (!dir.exists()) {
  dir.mkdirs();
  }

  // 根據當天日期來生成文件名
  String date = new SimpleDateFormat("yyyyMMdd", Locale.ENGLISH).format(new Date());
  // 創(chuàng)建文件
  File file = new File(dirPath, date + "_app_exception.txt");
  if (!file.exists()) {
  file.createNewFile();
  }

  fos = new FileOutputStream(file, true);
  fos.write(errMsg.getBytes());
  fos.write("\n".getBytes());
  fos.flush();
 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  if (fos != null) {
  try {
   fos.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
  }
 }
}