Android实现图片浮动随意拖拽效果
作者：烟味少男
这篇文章主要介绍了Android的图片在界面随意拖动的功能,小编觉得挺不错的，现在分享给大家，也给大家做个参考,一起跟随小编过来看看吧
本文实例为大家分享了Android实现图片浮动拖拽效果的具体代码，供大家参考，具体内容如下
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;
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对脚本之家的支持。