// 本地备份 private void backupDatabaseToSD() { AlertDialog.Builder builder = new AlertDialog.Builder( SettingActivity.this); builder.setTitle("SD卡备份"); builder.setMessage("备份文件保存在/sdcard/MrBill"); builder.setPositiveButton("保存", new DialogInterface.OnClickListener() { @SuppressLint({ "SdCardPath", "SdCardPath" }) @Override public void onClick(DialogInterface arg0, int arg1) { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { // File sdCardDir = // Environment.getExternalStorageDirectory();//获取SDCard目录 // File saveFile = new File(sdCardDir, "MyBudget.db"); File director = new File("/sdcard/MrBill");// 创建目录 File file = new File("/sdcard/MrBill/MyBudget.db");// 创建文件 if (!director.exists()) { director.mkdirs(); } if (!file.exists()) { try { FileInputStream fis = new FileInputStream( "/data/data/com.coderui.studentbudget/databases/MyBudget.db"); FileOutputStream fos = new FileOutputStream(file); byte[] buffer = new byte[1024]; int length = 0; while ((length = fis.read(buffer)) > 0) { fos.write(buffer, 0, length); } fos.flush(); fos.close(); fis.close(); } catch (Exception e) { e.printStackTrace(); } } else { file.delete(); try { FileInputStream fis = new FileInputStream( "/data/data/com.coderui.studentbudget/databases/MyBudget.db"); FileOutputStream fos = new FileOutputStream(file); byte[] buffer = new byte[1024]; int length = 0; while ((length = fis.read(buffer)) > 0) { fos.write(buffer, 0, length); } fos.flush(); fos.close(); fis.close(); } catch (Exception e) { e.printStackTrace(); } } } Toast.makeText(SettingActivity.this, "备份成功", Toast.LENGTH_SHORT) .show(); } }); builder.setNegativeButton("恢复", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }); builder.create().show();