Android:将资产sqlite数据库复制到数据库控制器时出错
我想在我的应用程序中使用预填充数据库，因此我找到了此代码Android:将资产sqlite数据库复制到数据库控制器时出错,android,database,file,copy,fileoutputstream,Android,Database,File,Copy,Fileoutputstream,我想在我的应用程序中使用预填充数据库，因此我找到了此代码 DB_NAME = "urg1718.sqlite" public SQLiteDatabase openDatabase() { File dbFile = context.getDatabasePath(DB_NAME); String path = dbFile.getAbsolutePath(); Log.i("path", "openDatabase: " + path); if (!dbFi
DB_NAME = "urg1718.sqlite"
public SQLiteDatabase openDatabase() {
File dbFile = context.getDatabasePath(DB_NAME);
String path = dbFile.getAbsolutePath();
Log.i("path", "openDatabase: " + path);
if (!dbFile.exists()) {
try {
//the file doesn't exist yet so this function is called
copyDatabase(dbFile);
} catch (IOException e) {
throw new RuntimeException("Error creating source database", e);
}
}
//check if the database is present in the folder
Log.i("database", "openDatabase: " + dbFile.exists());
return SQLiteDatabase.openDatabase(dbFile.getPath(), null, SQLiteDatabase.OPEN_READONLY);
}
private void copyDatabase(File dbFile) throws IOException {
//pre fil database
InputStream is = context.getAssets().open(DB_NAME);
try {
//where the error occurs
OutputStream os = new FileOutputStream(dbFile);
byte[] buffer = new byte[1024];
while (is.read(buffer) > 0) {
os.write(buffer);
}
os.flush();
os.close();
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();;
} catch (IOException e) {
e.printStackTrace();
}
}
谢谢。请参考此感谢，朋友！！！非常感谢你的朋友！！！