Android之图片浮动随意拖拽的效果实现

-----------------转载请注明出处：http://blog.csdn.net/android_cll

一：一般都是先上效果图，这个是可以在这个界面随意拖动的、

二：实现步骤、

1.先自定义一个浮动工具类、

public class MoveImage extends ImageView {

/**
 *
 * 浮动工具类
 *
 */
 private int lastX = 0;
   private int lastY = 0;

   private int dx;
   private int dy;
   private float movex = 0;
   private float movey = 0;

   private int screenWidth;
   private int screenHeight;

   public MoveImage(Context context, AttributeSet attrs) {
super(context, attrs);
      screenWidth = ScreenUtils.getWidth(context);
      screenHeight = ScreenUtils.getHeight(context);
   }

@Override
   public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
lastX = (int) event.getRawX();
         lastY = (int) event.getRawY();
         movex = lastX;
         movey = lastY;
         break;
      case MotionEvent.ACTION_MOVE:
dx = (int) event.getRawX() - lastX;
         dy = (int) event.getRawY() - lastY;

         int left = getLeft() + dx;
         int top = getTop() + dy;
         int right = getRight() + dx;
         int bottom = getBottom() + dy;
         if (left < 0) {
            left = 0;
            right = left + getWidth();
         }
if (right > screenWidth) {
            right = screenWidth;
            left = right - getWidth();
         }
if (top < 0) {
            top = 0;
            bottom = top + getHeight();
         }
if (bottom > screenHeight) {
            bottom = screenHeight;
            top = bottom - getHeight();
         }
         layout(left, top, right, bottom);
         lastX = (int) event.getRawX();
         lastY = (int) event.getRawY();
         break;
      case MotionEvent.ACTION_UP:
//避免滑出触发点击事件
         if ((int) (event.getRawX() - movex) != 0
               || (int) (event.getRawY() - movey) != 0) {
return true;
         }
break;
      default:
break;
      }
return super.onTouchEvent(event);
   }

}

2.xml布局的引用、

<com.zjtd.bzcommunity.text.MoveImage
    android:id="@+id/iv_phone_bar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="70dp"
    android:src="@drawable/my_qiandao_icon" />

3.activity的实现、

private MoveImage iv_phone_bar;//签到图片

iv_phone_bar = (MoveImage) view.findViewById(R.id.iv_phone_bar);

iv_phone_bar.setOnClickListener(this);

// 签到
case R.id.iv_phone_bar:
    startActivity(new Intent(getActivity(), SignAcitvity.class));//点击跳转页面
    break;

简单除暴超炫，你值得拥有。。。。看了帮我顶一下哦！

-------------------最后附上源码：http://download.csdn.net/download/android_cll/9803439