拖动图像？

问题描述

我试着做一些应用程序，它具有当用户移动图像到某一个地方解开......但问题是，当用户触摸别处，除了图像，它仍然试图将它给这个错误：java.lang.ClassCastException：android.widget.AbsoluteLayout $的LayoutParams

I'm try to do some app which has to unlock when user moved image to a certain place... But the problem is when the user touch somewhere else except the image, it still tries to move and it gives this error: java.lang.ClassCastException: android.widget.AbsoluteLayout$LayoutParams

下面是我的codeS：

Here's my codes:

公共类主要活动扩展{

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

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

    final ViewGroup vg = (ViewGroup) findViewById(R.id.lout);

    vg.setOnTouchListener(new View.OnTouchListener() {

        @SuppressWarnings("deprecation")
        public boolean onTouch(View v, MotionEvent event) {
                      switch (event.getAction()) {
                      case MotionEvent.ACTION_MOVE:
                          int x = (int) event.getX() - offset_x;
                          int y = (int) event.getY() - offset_y;
                          Log.e("SONUC", "SONUC1: " + x + ", " + y);
                          int w = getWindowManager().getDefaultDisplay().getWidth() - 25;
                          int h = getWindowManager().getDefaultDisplay().getHeight() - 25;
                          if (x > w)
                              x = w;
                          if (y > h)
                              y = h;
                          Log.e("SONUC", "SONUC2: " + x + ", " + y);
                          AbsoluteLayout.LayoutParams lp = new AbsoluteLayout.LayoutParams(
                                  new ViewGroup.MarginLayoutParams(
                                          AbsoluteLayout.LayoutParams.WRAP_CONTENT,
                                          AbsoluteLayout.LayoutParams.WRAP_CONTENT));
                          lp.x = x;
                          lp.y = y;
                          Log.e("SONUC", "SONUC3: " + lp);
                          selected_item.setLayoutParams(lp);

                          break;

                      case MotionEvent.ACTION_UP:
                          offset_x = (int) event.getX() - offset_x;
                          offset_y = (int) event.getY() - offset_y;
                          Log.e("SONUC", "SONUC5: " + offset_x + ", " + offset_y);
                          selected_item = v;
                          if (offset_x < 220 && offset_x > 150 && offset_y < 330 && offset_y > 300)
                              startActivity(new Intent("com.yahya.GeneralTraining.UNLOCKED"));
                          break;

            default:
                break;
            }
            return true;
        }
    });

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

        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:
                offset_x = (int) event.getX();
                offset_y = (int) event.getY();
                Log.e("SONUC", "SONUC4: " + offset_x + ", " + offset_y);
                selected_item = v;
                break;


            default:
                break;
            }
            return false;

        }
    });

}

}

推荐答案

您可以提供的onTouchListener一个检查的ViewGroup，以确认该图像被点击开始。

You can provide a check in the onTouchListener for viewgroup to confirm that the image is clicked initially.

vg.setOnTouchListener(new View.OnTouchListener() {

    @SuppressWarnings("deprecation")
    public boolean onTouch(View v, MotionEvent event) {
                if(selected_item.getId() == R.id.image){
                    switch (event.getActionMasked()) {
                      //your code
                    }
                }
        }
        return true;
    }
});

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