如何移动多个视图中的Andr​​oid？

问题描述

我遇到一些问题的看法。我创建了自己的视图（广场），我想动，我把在屏幕上的方块。与菜单，我可以把屏幕上的其他广场。问题是，该程序启动时，我在屏幕上一平方，我可以移动。但是当我把其他的广场，我就可以移动最后一个。我怎样才能解决这个问题？

i'm having some problems with views. I created my own View (Square) and i want to move any Squares that i put on the screen. With the menu, i can put other Squares on the screen. The thing is, that when the program starts, i have one square on the screen and i can move it. But when i put other squares, i can just move the last one. How can i fix this?

public class Square extends View {
private float x, y, width, height;
private int screenW, screenH;
public boolean isInside = false;
public int id=0;

public Square(Context context, int aid, int asw, int ash, float aw, float ah) {
    super(context);
    id = aid;
    screenH = ash;
    screenW = asw;
    x = asw/2;
    y = ash/2;
    width = aw;
    height = ah;
}
protected void onDraw(Canvas canvas){
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        canvas.drawLine(x, y, x+width, y, paint);
        canvas.drawLine(x, y, x, y+height, paint);
        canvas.drawLine(x+width, y+height, x+width, y, paint);
        canvas.drawLine(x+width, y+height, x, y+height, paint);
}
public void setPosition(float x, float y){
    this.x = x-width/2;
    this.y = y-height/2;
    //invalidate();
}
public int contains(float ax, float ay){
    if(ax==x || (ax<(x+width) && ax > x) || ax==(x+width))
        if(ay==y || (ay<(y+height) && ay > y) || ay==(y+height))
            return id;
    return -1;
}

}

public class SquareBuilder extends Activity {

private int width, height;
//private RelativeLayout layout;
private FrameLayout layout;
private int id=0;
private ArrayList<Square> squareList;
Square squareTouched;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_square_builder);
    Display display = null;
    display = getWindowManager().getDefaultDisplay();
    DisplayMetrics outMetrics = new DisplayMetrics();
    display.getMetrics(outMetrics);
    width = outMetrics.widthPixels;
    height = outMetrics.heightPixels;
    Log.i("Display size", "Width: "+width+" Height: "+height);
    Log.i("Display size", "Width: "+width/2+" Height: "+height/2);
    //layout = new RelativeLayout(this);
    layout = new FrameLayout(this);
    squareList = new ArrayList<Square>();
    Square sqr = new Square(this, id++, (int) width, (int)height,50,50);
    sqr.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            Square sqr = (Square) v;
            switch(event.getAction()){
            case MotionEvent.ACTION_DOWN:
                if(sqr.contains(event.getX(),event.getY())>=0)
                    sqr.isInside = true;
                break;
            case MotionEvent.ACTION_MOVE:
                if(sqr.isInside)
                    sqr.setPosition(event.getX(),event.getY());
                break;
            case MotionEvent.ACTION_UP:
                sqr.isInside = false;
                break;
            }
            sqr.invalidate();
            //return super.onTouchEvent(event);
            return true;
            //return false;
        }
    });
    squareTouched = null;
    squareList.add(sqr);
    layout.addView(sqr);
    setContentView(layout);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_square_builder, menu);
    return true;
}
public boolean onOptionsItemSelected(MenuItem item){
    switch(item.getItemId()){
        case R.id.menu_other:
            Square sqr = new Square(this, id++, (int) width, (int) height,50,50);
            sqr.setOnTouchListener(new View.OnTouchListener() {
                public boolean onTouch(View v, MotionEvent event) {
                    // TODO Auto-generated method stub
                    Square sqr = (Square) v;
                    switch(event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        if(sqr.contains(event.getX(),event.getY())>=0)
                            sqr.isInside = true;
                        break;
                    case MotionEvent.ACTION_MOVE:
                        if(sqr.isInside)
                            sqr.setPosition(event.getX(),event.getY());
                        break;
                    case MotionEvent.ACTION_UP:
                        sqr.isInside = false;
                        break;
                    }
                    sqr.invalidate();
                    //return super.onTouchEvent(event);
                    return true;
                    //return false;
                }
            });
            squareList.add(sqr);
            layout.addView(sqr);
            setContentView(layout);
            break;
    }
    return super.onOptionsItemSelected(item);
}

}

推荐答案

第一件事，使一个新的正方形的创作是SquareBuilder的方法：

First thing, make the creation of a new square be a method in SquareBuilder:

private Square newSquare() { ...

然后替换重复code与调用此新方法创建一个正方形。这会让你的问题更容易解决，因为你只会有code的一个副本。

Then replace the duplicate code for creating a square with calls to this new method. This will make your problem easier to solve because you will only have one copy of that code.

那么，也许添加一些记录每个case语句里面看看哪些事件是真正射击位置。

Then maybe add some logging inside each case statement to see what events are really firing where.

这可能有助于太：你需要从您的活动返回false当触摸事件是不是在广场上，这样的事件可以被传播到其他的听众。返回true消耗事件。

This may help too: Multiple Views OnTouch Events You need to return false from your event when the touch event was not on the square so that the event can be propagated to other listeners. Returning true consumes the event.

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