Question

我的老虎机仍在进行中。我试图从一个类到另一个类获得一个方法，但我无法弄明白。有人可以帮帮我吗？这是我想要从另一个类调用该方法的第一个代码：

GameMainActivity：

package com.ics136leeward.slotmachine;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ViewFlipper;

public class GameMainActivity extends Activity {
ViewFlipper slotOne, slotTwo, slotThree, spinStop;
Button spin, stop, bet;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_game_main);
    this.initSpin();
    this.initStop();
}

private void initSpin() { //initialize Spin Method
    spin = (Button) findViewById (R.id.spinBtn);
    slotOne = (ViewFlipper) findViewById (R.id.slot1);
    slotTwo = (ViewFlipper) findViewById (R.id.slot2);
    slotThree = (ViewFlipper) findViewById (R.id.slot3);
    spinStop = (ViewFlipper) findViewById (R.id.spinstopbutton);
    spin.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            slotOne.setFlipInterval(40); 
            slotOne.startFlipping(); //slot 1 spin
            slotTwo.setFlipInterval(50); 
            slotTwo.startFlipping(); //slot 2 spin
            slotThree.setFlipInterval(60); 
            slotThree.startFlipping(); //slot 3 spin
            spinStop.showNext(); // shows the stop button

        }
    });

} 

private void initStop() { //initialize Stop Method
    stop = (Button) findViewById (R.id.stopBtn);
    stop.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {
            slotOne.stopFlipping(); //stops slot 1
            slotTwo.stopFlipping(); //stops slot 2
            slotThree.stopFlipping(); //stops slot 3
            spinStop.showNext(); //shows the spin button again

            if(slotOne == slotTwo || slotTwo == slotThree) {

            }

        }
    });

}

}

这是第二个java类，我想把方法getBet1（）和getBet5（）调用到第一个活动：

赌注：

package com.ics136leeward.slotmachine;

import android.app.Activity;
import android.widget.TextView;

public class Bet extends Activity {
TextView userBet, bankRoll, event;
final int BETONE = 1, BETFIVE = 5;
int uBet = 100, bet;

public void getBet1() {
    userBet = (TextView) findViewById (R.id.userBet);
    bankRoll = (TextView) findViewById (R.id.bankroll);
    uBet -= BETONE;
    bet += BETONE;
    userBet.setText("Your Bet: " + bet);
    bankRoll.setText("" + uBet);

    return;
}

public void getBet5() {
    userBet = (TextView) findViewById (R.id.userBet);
    bankRoll = (TextView) findViewById (R.id.bankroll);
    uBet -= BETFIVE;
    bet += BETFIVE;
    userBet.setText("Your Bet: " + bet);
    bankRoll.setText("" + uBet);

    return;
}
}

Answer 1

您需要创建一个Utility类而不是Activity类

所以改变

public class Bet extends Activity {

到

public class Bet  // Normal java class

由于它不是Activity类，因此无需初始化视图

userBet = (TextView) findViewById (R.id.userBet); //remove them
// Initialize all yours views in Activity

现在在Activity类

中

Bet bet = new Bet();
int value =bet.getBet1();

在getBet1()中，您是否计算了返回值。

然后在Activity中，您可以将值设置为TextView

textView.setText(String.valueOf(value));

还要检查raghav的回答@

Can i Create the object of a activity in other class?

Answer 2

您可以定义这些方法static，然后按其class name调用

Bet.getBet1();
Bet.getBet5();

或者只是您可以创建类object然后调用它

Bet b = new Bet();
b.getBet1()

Answer 3

注意：由于您没有使用任何UI，因此无需扩展到Activity类。（已经由Raghunandan提出）

在您的调用类的onCreate方法中尝试此代码，即GameMainActivity

    Bet bet= new Bet(); // where bet is object of Bet Class
    bet.getBet1();
    bet.getBet5();

但是，您可以在任何方法中创建Bet类的对象，并访问类方法，前提是其访问修饰符必须为public。

从其他Java类调用方法

3 个答案: