Android实现悬浮图片

本文实例为大家分享了android实现悬浮图片的具体代码，供大家参考，具体内容如下

@suppresslint("appcompatcustomview")
public class moveimageview extends imageview {

 //按下那一刻的坐标和 控件上下左右距离
 private float lastx;
 private float lasty;
 private int left;
 private int top;
 private int right;
 private int bottom;


 //如果是拖动事件就不用响应点击事件
 boolean ismove = false;
 boolean isanimatoring = false;

 //屏幕宽高
 private int screenwidthpx;
 private int screenheightpx;


 public moveimageview(context context) {
  this(context, null);
 }

 public moveimageview(context context, @nullable attributeset attrs) {
  this(context, attrs, 0);
 }

 public moveimageview(context context, @nullable attributeset attrs, int defstyleattr) {
  super(context, attrs, defstyleattr);
  screenwidthpx = getscreenwidthpx(getcontext());
  screenheightpx = getscreenheightpx(getcontext());
 }

 @override
 public boolean ontouchevent(motionevent event) {
  switch (event.getaction()) {
   case motionevent.action_down:
    //动画执行过程中，不响应一切操作，
    // 这里相当于不让其走后面的motionevent.action_move:与motionevent.action_up:
    if (isanimatoring) {
     return false;
    }
    lastx = event.getrawx();
    lasty = event.getrawy();
    left = getleft();
    top = gettop();
    right = getright();
    bottom = getbottom();
    break;
   case motionevent.action_move:
    ismove = true;
    float x = event.getrawx();
    float y = event.getrawy();


    int l = (int) (left + (x - lastx));
    int t = (int) (top + (y - lasty));
    int r = (int) (right + (x - lastx));
    int b = (int) (bottom + (y - lasty));
    layout(l, t, r, b);
    break;
   case motionevent.action_up:
    if (ismove) {
     //如果顶部拖出屏幕外面，回正
     if (gettop() < 0) {
      layout(getleft(), 0, getright(), getheight());
     }

     //getbottom() 获取到的是 控件底部到父容器顶部的距离，所以需要减去状态栏的高度
     int bottomheight = screenheightpx - getstatusbarheight(getcontext());
     //如果底部拖出屏幕外面，回正
     if (getbottom() > bottomheight) {
      layout(getleft(), bottomheight-getheight(), getright(), bottomheight);
     }
     ismove = false;
     startanimation();
     return true;
    }
    return super.ontouchevent(event);
  }
  return super.ontouchevent(event);
 }

 private void startanimation() {

  isanimatoring = true;

  //右边距
  int marinright = displayutils.dptopx(20);
  int endvalue = screenwidthpx - marinright;
  valueanimator animator = valueanimator.ofint(getright(), endvalue);

  animator.setduration(math.abs(endvalue - getright()) > 1000 ? 1000 : math.abs(endvalue - getright()));

  animator.addupdatelistener(new valueanimator.animatorupdatelistener() {
   @override
   public void onanimationupdate(valueanimator animation) {
    int curvalue = (int) animation.getanimatedvalue();
    layout(curvalue - getwidth(), gettop(), curvalue, getheight() + gettop());
   }
  });
  animator.addlistener(new animatorlisteneradapter() {
   @override
   public void onanimationstart(animator animation) {

   }

   @override
   public void onanimationend(animator animation) {
    isanimatoring = false;
    animator.removeallupdatelisteners();
    animator.removealllisteners();
   }
  });
  animator.start();
 }

 /**
  * 获取状态栏高度
  */
 public static int getstatusbarheight(context context) {
  int result = 24;
  int resid = context.getresources().getidentifier("status_bar_height", "dimen", "android");
  if (resid > 0) {
   result = context.getresources().getdimensionpixelsize(resid);
  } else {
   result = (int) typedvalue.applydimension(typedvalue.complex_unit_dip,
     result, resources.getsystem().getdisplaymetrics());
  }
  return result;
 }

 public static int getscreenwidthpx(context context) {
  windowmanager windowmanager = (windowmanager) context.getsystemservice(context.window_service);
  displaymetrics dm = new displaymetrics();
  if (windowmanager != null) {
//   windowmanager.getdefaultdisplay().getmetrics(dm);
   windowmanager.getdefaultdisplay().getrealmetrics(dm);
   return dm.widthpixels;
  }
  return 0;

 }

 public static int getscreenheightpx(context context) {
  windowmanager windowmanager = (windowmanager) context.getsystemservice(context.window_service);
  displaymetrics dm = new displaymetrics();
  if (windowmanager != null) {
//   windowmanager.getdefaultdisplay().getmetrics(dm);
   windowmanager.getdefaultdisplay().getrealmetrics(dm);
   return dm.heightpixels;
  }
  return 0;

 }

}

应用：

布局文件:

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".testactivity">


 <com.lingtao.ltvideo.widgets.moveimageview
  android:layout_width="50dp"
  android:id="@+id/moveimageview"
  android:layout_height="50dp"
  android:layout_alignparentright="true"
  android:layout_alignparentbottom="true"
  android:layout_marginbottom="100dp"
  android:layout_marginright="20dp"
  android:src="#ff0000" />


</relativelayout>

activity:

public class testactivity extends appcompatactivity {

 private moveimageview moveimageview;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_test2);
  moveimageview = ((moveimageview) findviewbyid(r.id.moveimageview));
  moveimageview.setonclicklistener(new view.onclicklistener() {
   @override
   public void onclick(view v) {
    toast.maketext(testactivity.this, "点击事件", toast.length_short).show();
   }
  });
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。