Android Java在导入sqlite数据库时没有这样的文件或目录
我正在尝试导入一个sqlite数据库,这样它就超过了当前存在的数据库。我已经成功地将数据库导出到手机文件夹中的一个文件中,但当我尝试导入它时,会出现一个异常,即“没有这样的文件或目录”。我怎么修理它 这是我将数据库导出到文件的代码Android Java在导入sqlite数据库时没有这样的文件或目录,android,android-sqlite,sqliteopenhelper,Android,Android Sqlite,Sqliteopenhelper,我正在尝试导入一个sqlite数据库,这样它就超过了当前存在的数据库。我已经成功地将数据库导出到手机文件夹中的一个文件中,但当我尝试导入它时,会出现一个异常,即“没有这样的文件或目录”。我怎么修理它 这是我将数据库导出到文件的代码 private void exportDB() { try { File sd = Environment.getExternalStorageDirectory(); File data = Environment.getDa
private void exportDB() {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath= "//data//" + "com.varcon.campus"
+ "//databases//" + "CampusTime.db";
String backupDBPath = "/Download/CampusTime";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getBaseContext(), backupDB.toString(),
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
}
文件已成功导出到名为的文件夹中
这是我导入数据库的代码
int PICKFILE_RESULT_CODE = 1;
Intent chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
chooseFile.setType("*/*");
chooseFile = Intent.createChooser(chooseFile, "Choose a file");
startActivityForResult(chooseFile, PICKFILE_RESULT_CODE);
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent datas) {
Uri uri = datas.getData();
String filePath = uri.getPath();
try {
//Toast.makeText(this, ""+src, Toast.LENGTH_LONG).show();
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath= "//data//" + "com.varcon.campus"
+ "//databases//" + "CampusTime.db";
String backupDBPath = filePath;
File backupDB= new File(data, currentDBPath);
File currentDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getBaseContext(), backupDB.toString(),
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
//new CustomMessage(getActivity(), "Database replaced sucessfully");
} catch (Exception e) {
e.printStackTrace();
//CustomLog.showLogD("WORKING_STOP",e.getMessage());
}
super.onActivityResult(requestCode, resultCode, datas);
}
我在清单中有可用的权限
堆栈跟踪:
2020-03-10 23:14:43.704 31088-31088/com.varcon.campus D/error: java.io.FileNotFoundException: /storage/emulated/0/Download/CampusTime (No such file or directory)
您必须做的唯一一件事是为所选uri打开一个InputStream,而不是为文件使用FileInputStream
InputStream is = getContentResolver().openInputStream(data.getData());
然后像往常一样从流中读取。如果没有堆栈跟踪,很难调试崩溃。请参阅,以获取特定于Android的建议,以及获得堆栈跟踪后的操作建议。如果您仍然需要帮助,请编辑您的问题以包括堆栈跟踪。stack trace added@ryanmentley这不是堆栈跟踪
String filePath=uri.getPath()代码>。这不是一个文件路径。