Question

我有变量int myInt的基本问题。在void aktualizujRynek（）中，我为myInt赋值2。在void setImage（）中，变量的值为0，而不是2.为什么？

public class MainActivity extends AppCompatActivity {

int myInt;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

aktualizujRynek();
setImage();

}


public void aktualizujRynek(){
final Thread thread1 = new Thread(new Runnable() {
myInt = 2;
});
thread1.start();
}


public void setImage(){
if (myInt ==2){  
//do something
}
}


}

Answer 1

您应该覆盖import Data.List (elemIndex) after xs x y = case x `elemIndex` xs of Just i -> y `elem` (drop (i + 1) xs) Nothing -> False方法并将代码放在此方法中。从run()致电setImage()以获得正确的结果。

试试这个：

run()

希望这会起作用〜

Answer 2

我想使用voidsetImage（）设置我的图像，当满足2个条件时，if（myInt1 == 2＆amp;＆amp; myInt2 == 3）。但是当我在void setImage中使用myInt1和myInt2时，它们的值为0，尽管我赋值为2和3。

public class MainActivity extends AppCompatActivity {

int myInt1;
int myInt2;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

aktualizujRynek();
aktualizujPark();
setImage();

}


public void aktualizujRynek(){
final Thread thread1 = new Thread(new Runnable() {
    @Override
    public void run() {
        myInt1  = 2; // in my real code i take this value from HTTP response

    }
});

thread1.start();
}

public void aktualizujPark(){
final Thread thread2 = new Thread(new Runnable() {
    @Override
    public void run() {
        myInt2  = 3; // in my real code i take this value from HTTP response

    }
});

thread2.start();
}


public void setImage(){
if (myInt1 == 2  && myInt2 == 3){  
//do something
}
}


}

如何在另一种方法中使用变量？

2 个答案: