如何在`setOnItemClickListener(...`中)调用更多的那个方法

时间:2013-04-26 08:01:48

标签: java android gridview onitemclicklistener

我有GridView设置,我已经实现了setOnItemClickListener接口。首先,我做了一点Toast仅仅是为了反馈,然后我继续调用我的方法。第一种方法是有效的,我将它放入一个while循环中,它将调用它直到它返回true。第二种方法在插入代码时会阻止第一种方法工作,但我没有遇到任何编译错误。

以下是我的onCreate包含setOnItemClickListener() ,其中第二种方法我要插入注释

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    GridView gridview = (GridView) findViewById(R.id.gridview);
    gridview.setAdapter(new ImageAdapter(this));

    final GameplayController gc = new GameplayController(this);

    // Create board model, add units to player's list.
    final UnitArray gameBoardModel = new UnitArray();

    gridview.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v,
                int position, long id) {
            Toast.makeText(MainActivity.this, "" + position,
                    Toast.LENGTH_SHORT).show();
            boolean next = false;
            while (next == false) {
                next = gc.choosePiece(position, gameBoardModel,
                        (ImageView) v);
            }
            /*next = false;
            while (next == false) {
                next = gc.chooseEmpty(position, gameBoardModel,
                        (ImageView) v);
            }*/
        }
    });
}

我说第一种方法“有点”是有效的,因为它是一种方法,可以检查所选的GridView中的位置是否是“允许的”选择,并会在该选择中更新ImageView然后是return true,否则它将return false的想法是它将循环直到用户进行“有效”选择。现在,如果进行了有效选择,它确实会相应地更新选择中的ImageView,但是当选择“无效”时,它就会冻结。

因此它“有点”有效,但是当我插入第二个方法时,即使进行了“有效”选择,它也会冻结,并且它永远不会进入第二种方法。

我认为onItemClickListener()

有一些我遗漏的东西

-------------------------- EDIT -------------------附录--------------

如果它有助于查看我正在调用的第一个方法,

public boolean choosePiece(int position, UnitArray ua, ImageView iv) {
    if (ua.checkPiece(pNum, position) == true) {
        if (ua.checkType(position, "rock")) {
            ImageView v = iv;
            v.setImageResource(R.drawable.rock1select);
            return true;
        }
        if (ua.checkType(position, "paper")) {
            iv.setImageResource(R.drawable.paper1select);
            return true;
        }
        if (ua.checkType(position, "scissors")) {
            iv.setImageResource(R.drawable.scissors1select);
            return true;
        }
    }
    /*
     * With just the IF statements above catching the correct selections, my
     * program crashes. I thought simply adding the RETURN FALSE; to catch
     * everything else would work since it should just keep looping from the
     * mAINaCTIVITY until it hits one of them and RETURNS TRUE;. So I will
     * add this ELSE so that it will just redraw what is already there,
     * maybe that will fix it? Like, maybe it really really wants to use the
     * freaking listener for something.
     * 
     * Nope, that didn't help at all.
     */
    else {
        System.out.println("Ohhhh, NO YOU DIDN'T!!!");
        if (ua.checkType(position, "rock")) {
            System.out.println("Bad rock!, BAD!");
            ImageView v = iv;
            v.setImageResource(R.drawable.rock2);
            return false;
        }
        if (ua.checkType(position, "paper")) {
            ImageView v = iv;
            v.setImageResource(R.drawable.paper2);
            return false;
        }
        if (ua.checkType(position, "scissors")) {
            ImageView v = iv;
            v.setImageResource(R.drawable.scissors2);
            return false;
        }
        if (ua.checkType(position, "empty")) {
            ImageView v = iv;
            v.setImageResource(R.drawable.blank);
            return false;
        }
    }
    return false;
}

也许这里有一些我必须添加的东西告诉onItemClick..继续前进并停止发送触摸事件?

3 个答案:

答案 0 :(得分:2)

假设您知道GameplayController将要查看的元素数量:

boolean found = false;
int size = numberOfElements;
for(int i=0; i<size;i++) {
    if(gc.choosePiece(position, gameBoardModel,(ImageView) v)==true) {
        found = true;
        break;
    }
}
if(found) {
// do what u expect
}

答案 1 :(得分:0)

您说当您使用while循环向方法添加一些代码时,该方法似乎永远不会成功返回。您是否认为第二次while循环执行的条件永远不会计算为false? (在这种情况下,当值“true”被赋值给变量“next”?)

如果你不确定,也许你应该在每个循环中添加一个System.out.println(),输出哪个循环和“next”的值一起执行,很可能它永远都是假的,否则就不会你的想法。

答案 2 :(得分:0)

我的代码在提出这个问题时非常糟糕,但是直接的问题是我在onClick中创建了boolean next INSIDE,因此每次onClick都会被重置。将创建boolean next移至onClick之前将解决问题。

有时候我会看一个小问题太长时间,除了解决方案很简单之外什么都看不到问题。