Android uses WindowManager to make a drag-and-drop control _android

The effect chart is as follows

First step: new Dragview inheritance relativelayout

Package com.rong.activity;

Import COM.RONG.TEST.R;
Import Android.content.Context;
Import Android.graphics.Color;
Import Android.graphics.PixelFormat;
Import Android.util.AttributeSet;
Import android.view.Gravity;
Import android.view.MotionEvent;
Import Android.view.View;
Import Android.view.WindowManager;
Import Android.widget.Button;

Import Android.widget.RelativeLayout; public class Dragview extends Relativelayout {private WindowManager windowmanager;//for a floating window that can be dragged private windowmanager.l

 Ayoutparams windowparams;//Floating window parameters private Button MyButton;
 Public Dragview (context, AttributeSet attrs) {Super (context, attrs);
 Init ();
 private void Init () {view.inflate (GetContext (), r.layout.layout_my, this);
 MyButton = new Button (GetContext ());
 Mybutton.settext ("my");
 Mybutton.setbackgroundcolor (color.red);
 @Override public boolean ontouchevent (Motionevent event) {//Get the xy position int currentx = (int) event.getx () of the current point;
 int currenty = (int) event.gety (); Switch(Event.getaction ())
  {case MotionEvent.ACTION_DOWN:if (WindowManager = = null) {Setwindowparams (CurrentX, currenty);
  WindowManager = (WindowManager) getcontext (). Getsystemservice (Context.window_service);
  Windowmanager.addview (MyButton, windowparams);
 } break;
  Case motionevent.action_move:windowparams.x = CurrentX;
  Windowparams.y = CurrentY;
  Windowmanager.updateviewlayout (MyButton, windowparams);
 Break
  Case MOTIONEVENT.ACTION_UP://Windowmanager.removeview (MyButton);
 Break
 return true;
 "private void Setwindowparams (int x, int y) {//create thumbnail of item windowparams = new Windowmanager.layoutparams (); windowparams.gravity = Gravity.top |
 gravity.left;//This must add//Get preview the upper left corner relative to the screen coordinates windowparams.x = x;
 Windowparams.y = y;
 Set width and height windowparams.width = 200;
 Windowparams.height = 200; Windowparams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE |
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON  |
 WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
 Windowparams.format = pixelformat.translucent;
 windowparams.windowanimations = 0;

 }
}

Step Two: create a new layout file Activity_main.xml

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android=
"http://schemas.android.com/apk" /res/android "
  android:id=" @+id/main_touchlayout "
  android:layout_width=" Match_parent "
  android: layout_height= "Match_parent"
  android:background= "#ffffff"
  android:orientation= "vertical" >

  < Com.rong.activity.DragView
    android:id= "@+id/main_touchview"
    android:layout_width= "Match_parent"
    android:layout_height= "match_parent"
    android:layout_centerinparent= "true"
    android:background= " #ff0000 "/>

</RelativeLayout>

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