信号灯崩溃 android 应用

Question

作为高中时试图为 Comp Sci 制作一个快速简单的 android 应用程序的初学者，我一直在努力将一个功能性的冒险风格游戏移植到 android 5.1.1。你在两个按钮之间做出选择，穿过一座令人毛骨悚然的老房子，你的选择会影响结果。我采用的方法是使用带有 switch 语句的 do 循环，使用信号量等待选择。使用信号量似乎使我的应用程序崩溃：Logcat 未显示任何错误，但是当我在开始时放置调试选项，甚至在使用开关功能之前，应用程序在尝试获取信号量时崩溃。注释掉信号量解决了问题。

tl;dr 在 android 上处理双按钮选择的更合适方法是什么？

代码如下：

冒险游戏的主要部分

public static Button btnYes, btnNo;
public static TextView textField;
public static Semaphore semaphore = new Semaphore(0);
public static String btnUsed = "";
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_adventure);
    btnYes = (Button) findViewById(R.id.buttonYes);
    btnNo = (Button) findViewById(R.id.buttonNo);
    textField = (TextView) findViewById(R.id.textFieldText);
    textField.setText("Debug Screen! Begin?");
    btnYes.setText("Yes");
    btnNo.setText("No");
    try {
        semaphore.acquire();
        Switch();
    } catch (InterruptedException e) {

    }
}

     public void btnYesClicked(View v) {
    btnUsed = Prompts.yes;
    semaphore.release();
}

    public void btnNoClicked(View v) {
        btnUsed = Prompts.no;
        semaphore.release();
    }
    public static void Switch() throws InterruptedException {
    boolean isRunning = true;
    String place = Prompts.doorway;
    String choice = "";
    do {
        switch (place) {
        case Prompts.doorway:
            semaphore.drainPermits();
            textField.setText(Prompts.doorwayPrompt);
            btnYes.setText(Prompts.kitchen);
            btnNo.setText(Prompts.upstairs);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    place = Prompts.kitchen;
                } else {
                    place = Prompts.upstairs;
                }
            } else {
                place = "default";
            }
            break;
        case Prompts.kitchen:
            semaphore.drainPermits();
            textField.setText(Prompts.kitchenPrompt);
            btnYes.setText(Prompts.fridge);
            btnNo.setText(Prompts.cabinet);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    place = Prompts.fridge;
                } else {
                    place = Prompts.cabinet;
                }
            } else {
                place = "default";
            }
            break;
        case Prompts.upstairs:
            semaphore.drainPermits();
            textField.setText(Prompts.upstairsPrompt);
            btnYes.setText(Prompts.bedroom);
            btnNo.setText(Prompts.bathroom);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    place = Prompts.bedroom;
                } else {
                    place = Prompts.bathroom;
                }
            } else {
                place = "default";
            }
            break;
        case Prompts.fridge:
            semaphore.drainPermits();
            textField.setText(Prompts.fridgePrompt);
            btnYes.setText(Prompts.yes);
            btnNo.setText(Prompts.no);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    textField.setText(Prompts.fridgeYes);
                    place = "done";
                } else {
                    textField.setText(Prompts.fridgeNo);
                    place = "done";
                }
            }
            break;
        case Prompts.cabinet:
            semaphore.drainPermits();
            textField.setText(Prompts.cabinetPrompt);
            btnYes.setText(Prompts.yes);
            btnNo.setText(Prompts.no);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    textField.setText(Prompts.cabinetYes);
                    place = "done";
                } else {
                    textField.setText(Prompts.cabinetNo);
                    place = "done";
                }
            }
            break;
        case Prompts.bedroom:
            semaphore.drainPermits();
            textField.setText(Prompts.bedroomPrompt);
            btnYes.setText(Prompts.yes);
            btnNo.setText(Prompts.no);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    textField.setText(Prompts.bedroomYes);
                    place = "done";
                } else {
                    textField.setText(Prompts.bedroomNo);
                    place = "done";
                }
            }
            break;
        case Prompts.bathroom:
            semaphore.drainPermits();
            textField.setText(Prompts.bathroomPrompt);
            btnYes.setText(Prompts.yes);
            btnNo.setText(Prompts.no);
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    textField.setText(Prompts.bathroomYes);
                    place = "done";
                } else {
                    textField.setText(Prompts.bathroomNo);
                    place = "done";
                }
            }
            break;
        case "done":
            semaphore.drainPermits();
            btnYes.setText("Again");
            btnNo.setText("Finish");
            semaphore.acquire();
            choice = btnUsed;
            if (choice.equals(Prompts.yes) || choice.equals(Prompts.no)) {
                if (choice.equals(Prompts.yes)) {
                    place = Prompts.doorway;
                } else {
                    isRunning = false;
                }
            }
        default:
            textField.setText("Not a valid answer!");
            break;
        }
    } while (isRunning);
}

Activity XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".Adventure">

<TextView android:text="@string/app_name"
    android:layout_width="wrap_content"
    android:id="@+id/textFieldText"
    android:layout_height="wrap_content"
    android:layout_marginTop="73dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/yes"
    android:id="@+id/buttonYes"
    android:layout_alignTop="@+id/buttonNo"
    android:onClick="btnYesClicked"
    android:layout_alignParentStart="true" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/no"
    android:id="@+id/buttonNo"
    android:layout_centerVertical="true"
    android:onClick="btnNoClicked"
    android:layout_alignParentEnd="true" />

</RelativeLayout>

Answer 1

如评论中所述，您正在屏蔽 UI。更好的处理方法是将 String place 存储在字段变量中（就像您使用的按钮一样）。更改您的 Switch() 方法以接受选择参数 Switch(String choice) 并消除 do/while 然后更改您的 btnYesClicked 和 btnNoClicked 以调用 Switch 方法并传递正确的按钮。

信号灯崩溃 android 应用

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