所以这就是我的困境，我似乎无法在互联网上的任何地方找到它。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，然后一旦用户点击其中一个随机圆圈就会发生一个动作。这就像按钮的功能一样，但不同，因为整个圆圈都可以被点击。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。我试图在onTouchEvent方法中执行此操作，但现在我在logcat中发现错误，我已经发布了下面的那些以及主类的长。我觉得好像我非常接近找到这个问题的解决方案。如果有人能告诉我在这堂课中我做错了什么，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，如果这甚至可以完成，或者如果我要完全改变我的代码，谢谢你这里是我的主要课程，如果这有助于任何这是我唯一的其他代码，所以这里请忽略评论我我试图自己学习这个并且每次都失败了
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log cat
中收到这些错误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
答案 0 :(得分：0)
对于这些行，你在random.nextInt（）中使用负数，考虑使用Math.abs（）
，你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))));