分配不是表达式-Kotlin [英] Assignments are not expressions - Kotlin
本文介绍了分配不是表达式-Kotlin的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在将用Java构建的项目重构为Kotlin,并从sqlite资产表中复制数据库,我正在这样做,并且它可以正常工作.
I'm refactoring my project built with Java to Kotlin and to copy database from sqlite assets table I'm doing this and it works correctly.
private void copyDataBase() throws IOException {
InputStream mInput = mContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream mOutput = new FileOutputStream(outFileName);
byte[] mBuffer = new byte[1024];
int mLength;
while ((mLength = mInput.read(mBuffer)) > 0) {
mOutput.write(mBuffer, 0, mLength);
}
mOutput.flush();
mOutput.close();
mInput.close();
}
我该如何处理赋值不是表达式,在这种情况下只能使用表达式"?
How do I deal with "Assignments are not expressions, and only expressions are allowed in this context"?
@Throws(IOException::class)
private fun copyDataBase() {
val mInput = mContext.assets.open(DB_NAME)
val outFileName = DB_PATH + DB_NAME
val mOutput = FileOutputStream(outFileName)
val mBuffer = ByteArray(1024)
var mLength: Int
while ((mLength = mInput.read(mBuffer)) > 0) {
mOutput.write(mBuffer, 0, mLength)
}
mOutput.flush()
mOutput.close()
mInput.close()
}
错误在这里
while ((mLength = mInput.read(mBuffer)) > 0) {
mOutput.write(mBuffer, 0, mLength)
}
谢谢.
推荐答案
将其更改为:
mLength = mInput.read(mBuffer)
while (mLength > 0) {
mOutput.write(mBuffer, 0, mLength)
mLength = mInput.read(mBuffer)
}
这篇关于分配不是表达式-Kotlin的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文