所以我试着去一个名为&#34的XML文件;你失败了#34;由于某种原因,我收到一个错误,说它无法获得静态引用。有没有办法做我想做的事情?
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 = 0;
int randomHeight = 0;
public static int addPoints = 0;
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
if(random == null){
randomWidth =(int) (random.nextInt(Math.abs(getWidth()-radius/2)) + radius/2f);
randomHeight = (random.nextInt((int)Math.abs((getHeight()-radius/2 + radius/2f))));
}else {
randomWidth =(int) (random.nextInt(Math.abs(getWidth()-radius/2)) + radius/2f);
randomHeight = (random.nextInt((int)Math.abs((getHeight()-radius/2 + radius/2f))));
}
canvas.drawCircle(randomWidth, randomHeight + radius/2f, radius, paint);
}
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
if(isInsideCircle(x, y) == true){
//Do your things here
if(redColor == lastColor){
Activity.setContentView(R.layout.youfailed);
} else {
addPoints++;
}
}else {
}
return true;
}
private boolean isInsideCircle(int x, int y){
if ((((x - randomWidth)*(x - randomWidth)) + ((y - randomHeight)*(y - randomHeight))) < ((radius)*(radius)))
return true;
return false;
}
}
此方法中出现错误
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
if(isInsideCircle(x, y) == true){
//Do your things here
if(redColor == lastColor){
//it shows up right below here
Activity.setContentView(R.layout.youfailed);
} else {
addPoints++;
}
}else {
}
return true;
}
答案 0 :(得分:1)
你的问题就在这一行:
Activity.setContentView(R.layout.youfailed);
它不会这样工作。
您需要实际活动来设置内容视图。 setContentView不是静态方法。
更新:
您似乎尝试从其中一个Child-View对象中更改Activity的内容,这是非常糟糕的样式,不应该这样做。
视图永远不应该控制它的父实际显示的内容。 但是,回调父母可以解决您的问题。
回调只是一个带有一个或多个方法的接口,在你的情况下是一个:&#34; onFailure()&#34;,它将由例如活动。这&#34; onFailure()&#34;在你的onTouch()而不是setContentView()中调用,并且在你的实际Activity实现中(它必须像onClickListeners或onTouchListeners那样将自己注册为回调接收器),你可以做任何你喜欢的事情
回调接口示例:
public interface FailureCallback {
public void onFailure();
}
您可以将它作为内部接口放入DrawingView类中。在DrawingView类中,您需要一个用于实际回调实例的setter,然后您可以在onTouch()方法中调用。
在你的回调实现中,你不应该改变正在运行的活动的内容,而是考虑使用startActivity(...)来调用一个新的Activity。