Android Surfaceview Content Center Display

Cause of the problem:

Recently prepared to encapsulate a video player, I used the Surfaceview + mediaplayer approach.

Video loading display screen after encountering problems: " video distortion, proportional deformation ." ”

Problem:

Solution Ideas:

The video size is automatically populated with Surfaceview, so it's good to adjust the video size Surfaceview.

By listening to the MediaPlayer callback function "Onvideosizechanged" in the inside to modify the width of the surfaceview.

Changevideosize

 Public voidchangevideosize () {intVideowidth =mediaplayer.getvideowidth (); intVideoheight =mediaplayer.getvideoheight (); //calculates the maximum multiples of video that can be magnified in sufaceview based on the video size.         floatMax; if(Getresources (). GetConfiguration (). orientation==activityinfo.screen_orientation_portrait) {            //magnification by video width in portrait modemax = Math.max ((float) Videowidth/(float) Surfacewidth, (float) Videoheight/(float) surfaceheight); } Else{            //zoom in by video height in landscape modemax = Math.max ((float) videowidth/(float) (Surfaceheight), (float) videoheight/(float) surfacewidth); }                //Video Width-height difference/max-times numerical calculation of enlarged video sizeVideowidth = (int) Math.ceil (float) Videowidth/max); Videoheight= (int) Math.ceil (float) Videoheight/max); //The video size cannot be set directly, and the computed video size is set to Surfaceview for the video to be automatically populated. Surfaceview.setlayoutparams (Newrelativelayout.layoutparams (Videowidth, videoheight)); }

Note: The size of the Surfaceview requires a record to be saved as a fixed value , or the size changes after the screen is rotated.

Effect:

Full code:

 Public classMainactivityextendsAppcompatactivityImplementsSurfaceholder.callback, Mediaplayer.onvideosizechangedlistener {PrivateSurfaceview Surfaceview; PrivateMediaPlayer MediaPlayer; Private intSurfacewidth; Private intSurfaceheight; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate); //Initialize page/object/variable/listener eventsSetcontentview (R.layout.activity_main); Surfaceview=(Surfaceview) Findviewbyid (R.id.surfaceview); Surfaceview.getholder (). Addcallback ( This); }    Private voidplayvideo (String url) {Try{Mediaplayer.setdatasource ( This, Uri.parse (URL));            Mediaplayer.prepare (); Mediaplayer.start ();} Catch(IOException e) {e.printstacktrace ();} } @Override Public voidsurfacecreated (Surfaceholder surfaceholder) {MediaPlayer=NewMediaPlayer (); Mediaplayer.setonvideosizechangedlistener ( This); Mediaplayer.setdisplay (Surfaceholder);

if(Getresources (). GetConfiguration (). orientation==activityinfo.screen_orientation_portrait) {Surfacewidth=surfaceview.getwidth (); Surfaceheight=surfaceview.getheight (); }Else{surfacewidth=surfaceview.getheight (); Surfaceheight=surfaceview.getwidth (); } playvideo ("http://pgccdn.v.baidu.com/258500786_2854944371_20171201122626.mp4?authorization=bce-auth-v1% 2fc308a72e7b874edd9115e4614e1d62f6%2f2017-12-01t04%3a26%3a31z%2f-1%2f% 2fcbe73c8f603a65a23a019236ad32c090ba08f587acae4011d388f153d912724f&responsecachecontrol=max-age%3d8640000 &responseexpires=sun%2c+11+mar+2018+12%3a26%3a31+gmt&xcode= 0d70b526aeacd2423ca650defc16c18d96d564747874148f&time=1512191597&_=1512108201312 "); } @Override Public voidSurfacechanged (Surfaceholder Surfaceholder,intIintI1,intI2) {} @Override Public voidsurfacedestroyed (Surfaceholder surfaceholder) {mediaplayer.release (); MediaPlayer=NULL; }     Public voidchangevideosize () {intVideowidth =mediaplayer.getvideowidth (); intVideoheight =mediaplayer.getvideoheight (); //calculates the maximum multiples of video that can be magnified in sufaceview based on the video size.         floatMax; if(Getresources (). GetConfiguration (). orientation==activityinfo.screen_orientation_portrait) {            //magnification by video width in portrait modemax = Math.max ((float) Videowidth/(float) Surfacewidth, (float) Videoheight/(float) surfaceheight); } Else{            //zoom in by video height in landscape modemax = Math.max ((float) videowidth/(float) (Surfaceheight), (float) videoheight/(float) surfacewidth); }        //Video Width-height difference/max-times numerical calculation of enlarged video sizeVideowidth = (int) Math.ceil (float) Videowidth/max); Videoheight= (int) Math.ceil (float) Videoheight/max); //The video size cannot be set directly, and the computed video size is set to Surfaceview for the video to be automatically populated. Surfaceview.setlayoutparams (Newrelativelayout.layoutparams (Videowidth, videoheight)); } @Override Public voidOnvideosizechanged (MediaPlayer MP,intWidthintheight)    {changevideosize (); } @Override Public voidonconfigurationchanged (Configuration newconfig) {Super. onconfigurationchanged (Newconfig);    Changevideosize (); }}

Finally, we hope that we can provide other algorithms, there should be better.

Android Surfaceview Content Center Display