Android WindowManager for floating windows (i)--binding with current activity

Last Update:2016-01-19 Source: Internet

Author: User

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Recently there are students to do graduation design, want to use the effect of suspension window, in fact, we can do this through the system service windowmanager, This chapter we will try to create a suspended view above the current Activity.first step: know WindowManager <blockquote> L This interface is used to interact with window manager (windows manager, application Framework layer). L can obtain an instance of WM by Getsystemservice (context.window_service). L Inheritance Relationship Public interface WindowManager implements Viewmanager L belongs to the package Android.view.WindowManager L Important Methods AddView () Add View Removeview () Delete View Updateviewlayout () Change the view parameters </blockquote>　　Window Manager Serviceis global and Unique. It takes the User's actions, translates them into instructions, and sends them to the variousWindow. Activitythe top-level controls are registered to theWindow Managerwhen the user really touches the screen or keyboard,Window ManagerWill be notified, and when the control has some requests, it will beviewparentsent back toWindow ManagerThe. Thus completing the entire communication processstep two: Rewrite the Ontouchevent method of ImageViewThe previous step we know WindowManager can add, delete, change view, then want to achieve the drag effect of the suspended window we will get the coordinates of the ImageView Position. <blockquote> Gets the coordinates of the relative screen, which is the origin point in the upper-left corner of the screen float x = event.getrawx (); Float y = Event.getrawy ()-25; 25 is the height of the system status bar L set x, y through Windowmanager.layoutparams wmparams wmparams.x= (int) (x-mtouchstartx); wmparams.y= (int) (y-mtouchstarty); L Then set the current position of the suspended window through the Updateviewlayout () method </blockquote>Step three: Join PermissionsAdd the following permissions to the Androidmanifest.xml:<pre><pre><android:name= "android.permission.SYSTEM_ALERT_WINDOW"/></pre></pre>The effect is as Follows:Important Code : Create MyApplication<pre>Importandroid.app.Application;Importandroid.view.WindowManager; public classMyApplicationextendsApplication {/*** Create global variables * Note the application node in Androidmanifest.xml add Android:name= ". MyApplication "properties **/ PrivateWindowmanager.layoutparams wmparams=NewWindowmanager.layoutparams (); publicwindowmanager.layoutparams getmywmparams () {returnwmparams; }}</pre>Create a custom view inheritance ImageView<pre>Importandroid.content.Context;Importandroid.util.Log;Importandroid.view.MotionEvent;Importandroid.view.WindowManager;Importandroid.widget.ImageView; public classMyfloatviewextendsImageView {Private floatmtouchstartx; Private floatmtouchstarty; Private floatx; Private floaty; PrivateWindowManager wm=(windowmanager) getcontext (). getapplicationcontext (). getsystemservice (context.window_service); //This wmparams is the obtained global variable that holds the properties of the suspended window PrivateWindowmanager.layoutparams Wmparams =((myapplication) getcontext (). getapplicationcontext ()). getmywmparams (); publicMyfloatview (context Context) {Super(context); //TODO auto-generated Constructor stub} @Override public Booleanontouchevent (motionevent Event) {//gets the coordinates of the relative screen, which is the origin point in the Upper-left corner of the screenx =event.getrawx (); Y= Event.getrawy ()-25;//25 is the height of the system status barLOG.I ("currp", "currx" +x+ "====curry" +y); Switch(event.getaction ()) { casemotionevent.action_down://gets the coordinates of the relative view, which is the origin point in the upper left corner of the viewMtouchstartx =Event.getx (); Mtouchstarty=event.gety (); break; caseMotionEvent.ACTION_MOVE:updateViewPosition (); break; caseMotionEvent.ACTION_UP:updateViewPosition (); Mtouchstartx=mtouchstarty=0; break; } return true; } Private voidupdateviewposition () {//Update floating window position ParametersWmparams.x= (int) (x-mtouchstartx); Wmparams.y=(int) (ymtouchstarty); Wm.updateviewlayout ( this, wmparams); }}</pre>Create activity<pre>Importandroid.app.Activity;Importandroid.content.Context;Importandroid.graphics.PixelFormat;Importandroid.os.Bundle;Importandroid.util.Log;Importandroid.view.Gravity;Importandroid.view.View;Importandroid.view.WindowManager;Importandroid.view.View.OnClickListener;Importandroid.view.WindowManager.LayoutParams; public classMyfloatviewactivityextendsactivity{PrivateWindowManager wm=NULL; PrivateWindowmanager.layoutparams wmparams=NULL; PrivateMyfloatview myfv=NULL; @Override public voidonCreate (Bundle Savedinstancestate) {Super. OnCreate (savedinstancestate); Setcontentview (r.layout.main); //Create a hover windowCreateView (); } Private voidCreateView () {MYFV=NewMyfloatview (getapplicationcontext ()); Myfv.setimageresource (r.drawable.angry_birds); //Get WindowManagerwm=(windowmanager) getapplicationcontext (). getsystemservice (context.window_service); //set Layoutparams (global variables) related parametersWmparams =( (myapplication) getapplication ()). getmywmparams (); Wmparams.type=layoutparams.type_phone;//Set Window typewmparams.format=pixelformat.rgba_8888;//format picture, effect is transparent background//Set window Flagwmparams.flags=Layoutparams.flag_not_touch_modal|layoutparams.flag_not_focusable; Wmparams.gravity=gravity.left| gravity.top;//Adjust the hover window to the upper left corner//set x, y initial values as the origin in the Upper-left corner of the screenWmparams.x=0; Wmparams.y=0; //Setting the hover window length-width dataWmparams.width=40; Wmparams.height=40; //Show Myfloatview ImagesWm.addview (myfv, wmparams); } @Override public voidOnDestroy () {Super. OnDestroy (); //destroys a suspended window when program exits (activity Destruction)Wm.removeview (myfv); }}</pre>L finally modify the program permissions on the phone during program Installation-"hover window is availableJerry Education Source:http://www.cnblogs.com/jerehedu/ Copyright Notice: The copyright of this article belongs to cigarettes DeskJerry EducationSectionTechnology co., Ltd. and blog Park are shared, welcome reprint, but without the consent of the author must retain this paragraph, and in the article page obvious location to the original link, otherwise reserves the right to pursue legal responsibility. Technical Consultation:Android WindowManager for floating windows (i)--binding with current activity

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More

Android WindowManager for floating windows (i)--binding with current activity

Contact Us

A Free Trial That Lets You Build Big!

Sales Support

After-Sales Support