Question

我正在尝试用户可以移动图片的应用程序...当用户将其移动到某个地方时，应用程序应该执行其他操作...有点解锁...

但问题是当ACTION_UP语句不起作用时......有什么建议吗？

这是我的代码：

public class Main extends Activity {

    private View selected_item = null;
    private int offset_x = 0;
    private int offset_y = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ViewGroup vg = (ViewGroup) findViewById(R.id.lout);
        vg.setOnTouchListener(new View.OnTouchListener() {

            @Override
            @SuppressWarnings("deprecation")
            public boolean onTouch(View v, MotionEvent event) {

                          switch (event.getActionMasked()) {
                case MotionEvent.ACTION_MOVE:
                    int x = (int) event.getX() - offset_x;
                    int y = (int) event.getY() - offset_y;
                    int w = getWindowManager().getDefaultDisplay().getWidth() - 100;
                    int h = getWindowManager().getDefaultDisplay().getHeight() - 100;
                    if (x > w)
                        x = w;
                    if (y > h)
                        y = h;
                    AbsoluteLayout.LayoutParams lp = new AbsoluteLayout.LayoutParams(
                            new ViewGroup.MarginLayoutParams(
                                    AbsoluteLayout.LayoutParams.WRAP_CONTENT,
                                    AbsoluteLayout.LayoutParams.WRAP_CONTENT));
                    lp.x = x;
                    lp.y = y;
                    selected_item.setLayoutParams(lp);
                    break;
                default:
                    break;
                }
                return true;
            }
        });

        ImageView img = (ImageView) findViewById(R.id.imageView1);
        img.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getActionMasked()) {
                case MotionEvent.ACTION_DOWN:
                    offset_x = (int) event.getX();
                    offset_y = (int) event.getY();
                    selected_item = v;
                    break;
                case MotionEvent.ACTION_UP:
                    if (offset_x < 150 && offset_x > 120 && offset_y < 230
                            && offset_y > 200)
                        startActivity(new Intent(
                                "com.yahya.GeneralTraining.UNLOCKED"));
                    break;
                default:
                    break;
                }
                return false;

            }
        });

    }
}

Answer 1

我认为您需要在imageView onTouch（）回调中返回true。出于某种原因，在ACTION_DOWN之后返回false会导致您无法使用ACTION_UP进行另一次通话。

Answer 2

你的onTouch函数必须返回true。这样可以避免其他侦听器控制事件并弄乱您的应用程序。

Answer 3

看起来您的实施并不完全符合您的要求，您应该在offset_x而不是offset_y内分配ACTION_UP和ACTION_DOWN值。现在，它将起作用，如果用户开始从x（120到150）和y（200到230）拖动并放在任何地方。解锁意图会触发，但你想要的是从任何地方拖动并下降到x（120到150）和y（200到230）。

所以写：

@Override
public boolean onTouch(View v, MotionEvent event) {
    //Are you sure you want event.getActionMasked() ??
    //I use event.getAction() 
    switch (event.getAction()) {
       case MotionEvent.ACTION_DOWN:
       //I don't believe you really need anything to do here
       break;
       case MotionEvent.ACTION_UP:
           offset_x = (int) event.getX();
           offset_y = (int) event.getY();
           selected_item = v;
           if (offset_x < 150 && offset_x > 120 && offset_y < 230 && offset_y > 200)
               startActivity(new Intent("com.yahya.GeneralTraining.UNLOCKED"));
        break;
        default:
        break;
    }
    return false;
}
});

ACTION_UP不起作用

3 个答案: