Java 创建一个可以像按钮一样单击的随机圆，但它是一个圆

这就是我的困境，我在互联网上找不到这个。我的问题很简单。我正在为android创建一个游戏应用程序。游戏将在屏幕上生成用户可以点击的随机圆圈，一旦用户点击其中一个随机圆圈，就会发生动作。这与按钮的功能类似，但不同之处在于可以单击整个圆圈。我将发布生成圆圈的随机数生成器。这不是主类这是一个扩展视图的独立类。我在下面的onTouchEvent方法中尝试过这样做，但是现在我在logcat中得到了错误，我已经在下面的主类中发布了这些错误。请让我觉得我很快就能找到解决这个问题的办法了。如果有人能告诉我我在这门课上做错了什么，那将非常有帮助，谢谢大家

public class DrawingView extends View {



public DrawingView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub

}
RectF rectf = new RectF(0, 0, 200, 0);

private static final int w = 100;
public static int lastColor = Color.BLACK;
private final Random random = new Random();
private final Paint paint = new Paint();
private final int radius = 230;
private final Handler handler = new Handler();
public static int redColor = Color.RED;
public static int greenColor = Color.GREEN;
int randomWidth =(int) (random.nextInt(getWidth()-radius/2) + radius/2f);
int randomHeight = (random.nextInt((int) (getHeight()-radius/2 + radius/2f)));

private final Runnable updateCircle = new Runnable() {
    @Override 
    public void run() {
        lastColor = random.nextInt(2) == 1 ? redColor : greenColor;
        paint.setColor(lastColor);
        invalidate();
        handler.postDelayed(this, 1000);

    }
};



@Override 
protected void onAttachedToWindow() {
    super.onAttachedToWindow();
    handler.post(updateCircle);
}

@Override 
protected void onDetachedFromWindow() {
    super.onDetachedFromWindow();
    handler.removeCallbacks(updateCircle);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    // your other stuff here

    canvas.drawCircle(randomWidth, randomHeight + radius/2f, radius, paint);
}

@Override
public boolean onTouchEvent (MotionEvent event) {

    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN : 
            randomWidth = (int) event.getX();
            randomHeight = (int) event.getY();
            invalidate(); 
            break;
    }

    return true;

}

告诉我这是否可以做到，或者我是否必须完全改变我的代码谢谢这里是我的主要课程如果这对我有帮助这是我唯一的其他代码所以在这里请忽略我自己试图学习的评论，每次都失败得很惨

public class Main extends Activity {
    DrawingView v;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);


        LinearLayout layout1 = new LinearLayout (this);
        FrameLayout game = new FrameLayout(this);
        DrawingView v = new DrawingView (this);

        TextView myText = new TextView(this);

        //int w = getResources().getInteger(DrawingView.redColor);
        //Button redCircle = (Button) findViewById(w);



         //redCircle.setWidth(300);
         //redCircle.setText("Start Game");


        layout1.addView(myText);
       // layout1.addView(redCircle); 
        //redCircle.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

        //game.addView(myText);
        game.addView(v);
        game.addView(layout1);
        setContentView(game);
        //redCircle.setOnClickListener((OnClickListener) this);
    }
    public void onClick(View v) {
        Intent intent = new Intent(this, Main.class);
            startActivity(intent);

        // re-starts this activity from game-view. add this.finish(); to remove from stack
   }

    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

我现在在日志中得到这些错误

03-31 01:48:52.594: E/AndroidRuntime(2395): FATAL EXCEPTION: main
03-31 01:48:52.594: E/AndroidRuntime(2395): Process: com.Tripps.thesimplegame, PID: 2395
03-31 01:48:52.594: E/AndroidRuntime(2395): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Tripps.thesimplegame/com.Tripps.thesimplegame.Main}: java.lang.IllegalArgumentException: n <= 0: -115
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread.access$800(ActivityThread.java:144)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.os.Looper.loop(Looper.java:135)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread.main(ActivityThread.java:5221)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at java.lang.reflect.Method.invoke(Native Method)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at java.lang.reflect.Method.invoke(Method.java:372)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-31 01:48:52.594: E/AndroidRuntime(2395): Caused by: java.lang.IllegalArgumentException: n <= 0: -115
03-31 01:48:52.594: E/AndroidRuntime(2395):     at java.util.Random.nextInt(Random.java:182)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at com.Tripps.thesimplegame.DrawingView.<init>(DrawingView.java:37)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at com.Tripps.thesimplegame.Main.onCreate(Main.java:30)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.Activity.performCreate(Activity.java:5933)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
03-31 01:48:52.594: E/AndroidRuntime(2395):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
03-31 01:48:52.594: E/AndroidRuntime(2395):     ... 10 more

03-31 01:48:52.594:E/AndroidRuntime（2395）：致命异常：main
03-31 01:48:52.594:E/AndroidRuntime（2395）：进程：com.Tripps.thesimplegame，PID:2395
03-31 01:48:52.594:E/AndroidRuntime（2395）：java.lang.RuntimeException:无法启动活动组件信息{com.Tripps.thesimplegame/com.Tripps.thesimplegame.Main}:java.lang.IllegalArgumentException:n对于这些行，在random.nextInt（）中使用负数，考虑使用Math.abs（）时必须使用正数

而不是

int randomWidth =(int) (random.nextInt(getWidth()-radius/2) + radius/2f);
int randomHeight = (random.nextInt((int) (getHeight()-radius/2 + radius/2f)));

使用Math.abs（），这样就不会给random.nextInt（）一个负数

int randomWidth =(int) (random.nextInt(Math.abs(getWidth()-radius/2)) + radius/2f);
    int randomHeight = (random.nextInt((int) Math.abs((getHeight()-radius/2 + radius/2f))));

是的，这也不起作用，我仍然得到相同的错误，看这里，这是因为你这次给它0，以及你如何使用getwidth（）和getheight（）是错误的，我认为你应该在视图中覆盖onSizeChanged并将它们设置在那里，int，int，int）