Android 自定义LineLayout实现满屏任意拖动功能的示例代码

1.前言

在开发中，会有需求实现控件在屏幕随意拖动，这就需要自定义view,然后在ontouchevent事件中，处理motionevent.action_move事件，然后通过坐标点传值给onlayout方法,来实现控件的任意拖动，具体代码如下：

import android.content.context;
import android.util.attributeset;
import android.view.display;
import android.view.motionevent;
import android.view.windowmanager;
import android.widget.linearlayout;

public class draglinelayout extends linearlayout {

 private int mwidth;
 private int mheight;
 private int mscreenwidth;
 private int mscreenheight;
 private context mcontext;
 private onlocationlistener mlocationlistener;/*listen to the rect */
 //是否拖动
 private boolean isdrag = false;

 public boolean isdrag() {
  return isdrag;
 }

 public dragview(context context, attributeset attrs) {
  super(context, attrs);
  this.mcontext = context;
 }

 @override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
  super.onmeasure(widthmeasurespec, heightmeasurespec);
  mwidth = getmeasuredwidth();
  mheight = getmeasuredheight();
  mscreenwidth = getscreenwidth(mcontext);
  mscreenheight = getscreenheight(mcontext) - getstatusbarheight();
 }

 public int getstatusbarheight() {
  int resourceid = mcontext.getresources().getidentifier("status_bar_height", "dimen", "android");
  return mcontext.getresources().getdimensionpixelsize(resourceid);
 }

 public int getscreenwidth(context context) {
  windowmanager manager = (windowmanager) context
    .getsystemservice(context.window_service);
  display display = manager.getdefaultdisplay();
  return display.getwidth();
 }

 public int getscreenheight(context context) {
  windowmanager manager = (windowmanager) context
    .getsystemservice(context.window_service);
  display display = manager.getdefaultdisplay();
  return display.getheight();
 }

 private float mdownx;
 private float mdowny;


 @override
 public boolean ontouchevent(motionevent event) {
  super.ontouchevent(event);
  if (this.isenabled()) {
   switch (event.getaction()) {
    case motionevent.action_down:
     isdrag = false;
     mdownx = event.getx();
     mdowny = event.gety();
     break;
    case motionevent.action_move:
     final float mxdistance = event.getx() - mdownx;
     final float mydistance = event.gety() - mdowny;
     int l, r, t, b;
     //当水平或者垂直滑动距离大于10,才算是拖动事件
     if (math.abs(mxdistance) > 10 || math.abs(mydistance) > 10) {
      isdrag = true;
      l = (int) (getleft() + mxdistance);
      r = l + mwidth;
      t = (int) (gettop() + mydistance);
      b = t + mheight;
      //边界判断,不让布局滑出界面
      if (l < 0) {
       l = 0;
       r = l + mwidth;
      } else if (r > mscreenwidth) {
       r = mscreenwidth;
       l = r - mwidth;
      }
      if (t < 0) {
       t = 0;
       b = t + mheight;
      } else if (b > mscreenheight) {
       b = mscreenheight;
       t = b - mheight;
      }
      //回调移动后的坐标点
      if(mlocationlistener!=null){
       mlocationlistener.locationrect((l+r)/2,(t+b)/2);
      }
      this.layout(l, t, r, b);
     }
     break;
    case motionevent.action_up:
     setpressed(false);
     break;
    case motionevent.action_cancel:
     setpressed(false);
     break;
   }
   return true;
  }
  return false;
 }
 public void setlocationlistener(onlocationlistener locationlistener) {
  this.mlocationlistener = locationlistener;
 }
 public interface onlocationlistener {
  void locationrect(float locationx, float locationy);
 }
}

2.在代码中的运用

<com.xinrui.guestservice.view.draglinelayout 
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="@dimen/dp_200"
 android:layout_height="@dimen/dp_110"
 android:orientation="vertical">
 <relativelayout
  android:layout_width="match_parent"
  android:layout_height="@dimen/dp_50">
 <edittext
  android:id="@+id/input_edt"
  android:layout_width="match_parent"
  android:layout_height="@dimen/dp_50"
  android:background="@drawable/edit_bg" />
 </relativelayout>
 <relativelayout
  android:layout_width="match_parent"
  android:layout_height="@dimen/dp_55"
  android:layout_margintop="@dimen/margin_5"
  android:background="@drawable/paint_bg">

  <textview
   android:id="@+id/paint_typeface"
   android:layout_width="@dimen/dp_50"
   android:layout_height="@dimen/dp_50"
   android:layout_alignparentleft="true"
   android:layout_alignparenttop="true"
   android:layout_margintop="@dimen/margin_5"
   android:background="@drawable/main_selector_write"
   android:clickable="true" />

  <textview
   android:id="@+id/paint_fontsize"
   android:layout_width="@dimen/dp_50"
   android:layout_height="@dimen/dp_50"
   android:layout_alignparenttop="true"
   android:layout_marginleft="@dimen/dp_10"
   android:layout_margintop="@dimen/margin_5"
   android:layout_torightof="@id/paint_typeface"
   android:background="@drawable/main_selector_write"
   android:clickable="true" />
 </relativelayout>
</com.xinrui.guestservice.view.draglinelayout>

3.这样就可以在activity 加载这个xml 来实现任意拖动功能

总结

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