数据库初始化,该怎么解决

数据库初始化
public SQLiteDatabase initdatabase() {
// TODO Auto-generated method stub
if (!new File(databasepath).exists()) {

new File(databasepath).mkdir();
}

File databasefile = new File(databasepath + databasename);
if (!databasefile.exists()) {

try {
System.out.println(databasepath);
databasefile.createNewFile();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
InputStream inputStream = null;
FileOutputStream outputStream = null;
try {
inputStream = activity.getResources().getAssets()
.open(databasename);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

try {
outputStream = new FileOutputStream(databasepath + databasename);
} catch (FileNotFoundException e) {
e.printStackTrace();
}

byte[] buffer = new byte[1024];
int length;
try {
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
buffer = new byte[1024];// 一次写入128B的数据
System.out.println("write over!");
}
} catch (IOException e) {
e.printStackTrace();
}
// Close the streams
try {
outputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
sqLiteDatabase = null;
sqLiteDatabase = SQLiteDatabase.openDatabase(databasepath
+ databasename, null, SQLiteDatabase.OPEN_READWRITE);
Toast.makeText(activity, "位于本地的数据库初始化完成！", Toast.LENGTH_LONG)
.show();

}
sqLiteDatabase = SQLiteDatabase.openDatabase(databasepath
+ databasename, null, SQLiteDatabase.OPEN_READWRITE);

return sqLiteDatabase;

}


为什么一个初始化的代码要那么长？ 哪些是可以省略的？ 数据库
[解决办法]

public SQLiteDatabase initdatabase() throws Exception {
        if (!new File(databasepath).exists()) {

            new File(databasepath).mkdir();
        }
        File databasefile = new File(databasepath + databasename);
        if (!databasefile.exists()) {
            System.out.println(databasepath);
            databasefile.createNewFile(); 
 
            InputStream inputStream = null;
            FileOutputStream outputStream = null;
            inputStream = activity.getResources().getAssets()
                    .open(databasename);
            outputStream = new FileOutputStream(databasepath + databasename);
            byte[] buffer = new byte[1024];
            int length;
            while ((length = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
                buffer = new byte[1024];// 一次写入128B的数据
                System.out.println("write over!");
            }
            // Close the streams
            outputStream.flush();
            outputStream.close();
            sqLiteDatabase = null;
            sqLiteDatabase = SQLiteDatabase.openDatabase(databasepath
                    + databasename, null, SQLiteDatabase.OPEN_READWRITE);
            Toast.makeText(activity, "位于本地的数据库初始化完成！", Toast.LENGTH_LONG)
                    .show();
            sqLiteDatabase = SQLiteDatabase.openDatabase(databasepath
                    + databasename, null, SQLiteDatabase.OPEN_READWRITE);
            return sqLiteDatabase;
        }
    }