Question

我即将创建我的第一个Android应用程序：This is a screenshot of how the app looks

所以这个应用程序的主要思想是在两个按钮中生成随机数如果猜对了，用户猜猜哪个数字更大：

这是XML布局

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/app_name"
    android:gravity="center_horizontal"
    android:text="Press the button of the larger Number.if you get it right you will earn point !if you get it wrong you'll lose a point"
    android:textSize="16sp" />

<LinearLayout
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentEnd="true"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:orientation="horizontal">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/left_button_number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0"
            android:textStyle="bold" />

        <Button
            android:id="@+id/right_button_number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:text="0"
            android:textStyle="bold" />
    </RelativeLayout>

</LinearLayout>

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_gravity="top"
    android:layout_marginBottom="57dp"
    android:gravity="center_horizontal"
    android:text="points : "
    android:textStyle="italic" />

<TextView
    android:id="@+id/score_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/textView"
    android:layout_toEndOf="@+id/textView"
    android:layout_toRightOf="@+id/textView"
    android:text="0" />

<Button
    android:id="@+id/reset_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/linearLayout"
    android:layout_centerHorizontal="true"
    android:text="Reset" />

这是Java代码

public class MainActivity extends AppCompatActivity {
int leftNumber;
int rightNumber;
private OnClickListener ButtonClickListener = new OnClickListener() {
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.left_button_number:
                if (rightNumber < leftNumber)
                    updateTheScore(1);
                else
                    updateTheScore(-1);
                break;
            case R.id.right_button_number:
                if (rightNumber > leftNumber)
                    updateTheScore(1);
                else
                    updateTheScore(-1);

                break;
            case R.id.reset_button:
                resetTheScore();
                break;
            default:
                break;
        }

    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    numberGenerator();
    Button rightButton = (Button) findViewById(R.id.right_button_number);
    Button leftButton = (Button) findViewById(R.id.left_button_number);
    Button resetButton = (Button) findViewById(R.id.reset_button);
    rightButton.setOnClickListener(ButtonClickListener);
    leftButton.setOnClickListener(ButtonClickListener);
    resetButton.setOnClickListener(ButtonClickListener);


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}

public void updateTheScore(int n) {
    TextView scoreView = (TextView) findViewById(R.id.score_text_view);
    int score = Integer.parseInt(scoreView.getText().toString());
    score += n;
    scoreView.setText(score);
    numberGenerator();
}

public void resetTheScore() {
    TextView scoreView = (TextView) findViewById(R.id.score_text_view);
    scoreView.setText(0);
    numberGenerator();
}

public void numberGenerator() {
    int min = 1;
    int max = 100;
    Random r = new Random();
    leftNumber = r.nextInt(max - min + 1) + min;
    rightNumber = r.nextInt(max - min + 1) + min;
    displayMessageOnButton(leftNumber, rightNumber);
}

public void displayMessageOnButton(int left, int right) {
    Button rightButton = (Button) findViewById(R.id.right_button_number);
    Button leftButton = (Button) findViewById(R.id.left_button_number);
    rightButton.setText(right);
    leftButton.setText(left);
}

这是logcat

 String resource ID #0x4a
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2194)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)
                                                                         at android.app.ActivityThread.access$600(ActivityThread.java:139)
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                         at android.os.Looper.loop(Looper.java:154)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:4945)
                                                                         at java.lang.reflect.Method.invokeNative(Native Method)
                                                                         at java.lang.reflect.Method.invoke(Method.java:511)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
                                                                         at dalvik.system.NativeStart.main(Native Method)
                                                                      Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x4a
                                                                         at android.content.res.Resources.getText(Resources.java:266)
                                                                         at android.widget.TextView.setText(TextView.java:3627)
                                                                         at com.example.android.big.MainActivity.displayMessageOnButton(MainActivity.java:87)
                                                                         at com.example.android.big.MainActivity.numberGenerator(MainActivity.java:81)
                                                                         at com.example.android.big.MainActivity.onCreate(MainActivity.java:39)
                                                                         at android.app.Activity.performCreate(Activity.java:4531)
                                                                         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2150)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229) 
                                                                         at android.app.ActivityThread.access$600(ActivityThread.java:139) 
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:99) 
                                                                         at android.os.Looper.loop(Looper.java:154) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:4945) 
                                                                         at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                         at java.lang.reflect.Method.invoke(Method.java:511) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
                                                                         at dalvik.system.NativeStart.main(Native Method)

Answer 1

public void numberGenerator() {
    int min = 1;
    int max = 100;
    Random r = new Random();
    leftNumber = r.nextInt((max - min) + 1) + min;
    rightNumber = r.nextInt((max - min) + 1) + min;
    displayMessageOnButton(leftNumber, rightNumber);
}

无法将整数设置为文本

public void displayMessageOnButton(int left, int right) {
    Button rightButton = (Button) findViewById(R.id.right_button_number);
    Button leftButton = (Button) findViewById(R.id.left_button_number);
    rightButton.setText(right+"");
    leftButton.setText(left+"");

}

执行android应用程序时出错

1 个答案: