Android uses Textureview to play video

Last Update:2015-07-08 Source: Internet

Author: User

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1. IntroductionIf you want to display an online video or any data stream such as video or OpenGL scenes, you can do it with Android Textureview. 1). Textureview's Brother Surfaceview.The video or OpenGL content of the application is often displayed in a special UI Control: Surfaceview. The way Surfaceview works is to create a new window that is placed after the app Window. This approach is very efficient because the Surfaceview window refreshes without the need to redraw the Application's window (the View drawing mechanism of the Android normal window is layered, and any child element or partial refresh causes the entire view structure to be redrawn all at once, so it is inefficient But the need for a common application interface is more than enough, but Surfaceview also has some very inconvenient limitations.Because the content of Surfaceview is not on the application window, transformations (panning, zooming, rotating, and so On) cannot be used. It is also difficult to put in a ListView or scrollview, and you cannot use some of the UI controls ' features such as <code style="font-family:Consolas,‘Liberation Mono‘,Menlo,Courier,monospace; border:0px; margin:0px; padding:0.2em 0px; line-height:normal">View.setAlpha()</code> .<p style="font-size:14px; border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; color:rgb(51,51,51); font-family:‘Helvetica,Tahoma,Arial,sans-serif‘; text-align:justify"><p style="font-size:14px; border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; color:rgb(51,51,51); font-family:‘Helvetica,Tahoma,Arial,sans-serif‘; text-align:justify"> <p style="font-size:14px; border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; color:rgb(51,51,51); font-family:‘Helvetica,Tahoma,Arial,sans-serif‘; text-align:justify"><p style="font-size:14px; border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; color:rgb(51,51,51); font-family:‘Helvetica,Tahoma,Arial,sans-serif‘; text-align:justify"> 2). in order to solve this problem, Android 4.0 introduced TEXTUREVIEW.Textureview compared to surfaceview, Textureview does not create a separate surface for drawing, which allows it to perform some transformations, set transparency, and so on, like a normal view. In addition, the Textureview must be in the window where hardware acceleration is enabled. <p style="border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; Color:rgb (51,51,51); Font-family: ' Helvetica,tahoma,arial,sans-serif '; Text-align:justify "> problems encountered in the Project: 1. before using surfaceview play video, from the picture switch to play video, there will be a black screen Phenomenon. <p style="border:0px; margin-top:8px; margin-bottom:8px; padding-top:0px; padding-bottom:0px; line-height:22px; Color:rgb (51,51,51); Font-family: ' Helvetica,tahoma,arial,sans-serif '; Text-align:justify "> &NBS P 2.surfaceview Flexibility without textureview Good. 2. Project Source codeMainactivity.java file<pre name="code" class="java">package Com.example.textureviewvideo;import Java.io.file;import Java.io.fileoutputstream;import Java.io.inputstream;import Java.io.outputstream;import Android.app.activity;import Android.content.res.assetmanager;import Android.graphics.surfacetexture;import Android.media.AudioManager;import Android.media.mediaplayer;import Android.media.mediaplayer.onpreparedlistener;import Android.os.Bundle;import Android.os.environment;import Android.util.log;import Android.view.surface;import Android.view.TextureView;import Android.view.view;import Android.view.textureview.surfacetexturelistener;import Android.widget.ImageView;public Class Mainactivity extends Activity implements Surfacetexturelistener{//private Textureview textureview;private MediaPlayer mmediaplayer;private Surface surface;private ImageView videoimage; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); Textureview textureview= (textureview) Findviewbyid (r.id.textureview); textureview.setsurfacetexturelistener (this);//set listener function Rewrite 4 methods//textureview=new textureviewtest (this);//setcontentview (textureview); videoimage= (ImageView) Findviewbyid ( r.id.video_image);} @Overridepublic void onsurfacetextureavailable (surfacetexture surfacetexture, int width,int Height) { System.out.println ("onsurfacetextureavailable onsurfacetextureavailable"); surface=new surface (surfacetexture); New Playervideo (). start ();//open a thread to play the video} @Overridepublic void onsurfacetexturesizechanged (surfacetexture surface, int width,int height) {System.out.println ("onsurfacetexturesizechanged onsurfacetexturesizechanged");} @Overridepublic boolean onsurfacetexturedestroyed (surfacetexture surfacetexture) {System.out.println (" onsurfacetexturedestroyed onsurfacetexturedestroyed "); surfacetexture=null;surface=null;mmediaplayer.stop (); Mmediaplayer.release (); return true;} @Overridepublic void onsurfacetextureupdated (surfacetexture surfacetexture) {//system.Out.println ("onsurfacetextureupdated onsurfacetextureupdated");} Private class Playervideo extends Thread{@Overridepublic void run () {try {file file=new file (environment.getexternalstor Agedirectory () + "/ansen.mp4"); If (!file.exists ()) {//file does not exist CopyFile (); } mmediaplayer= New MediaPlayer (); Mmediaplayer.setdatasource (file.getabsolutepath ()); Mmediaplayer.setsurface (surface); Mmediaplayer.setaudiostreamtype (audiomanager.stream_music); Mmediaplayer.setonpreparedlistener (new onpreparedlistener () {@Overridepublic void onprepared (MediaPlayer Mp) { Videoimage.setvisibility (view.gone); Mmediaplayer.start ();} }); Mmediaplayer.prepare (); } catch (Exception E) {e.printstacktrace (); }}}public interface playercontroller{public void play (); /** * If SDcard does not have a file, copy the past */private void CopyFile () {assetmanager assetmanager = this.getassets (); InputStream in = null; OutputStream out = null; Try {in = Assetmanager.open ("ansen.mp4"); String NewFileName = EnvironmenT.getexternalstoragedirectory () + "/ansen.mp4"; out = new FileOutputStream (newfilename); byte[] buffer = new byte[1024]; int read; While (read = In.read (buffer))! =-1) {out.write (buffer, 0, read); } in.close (); in = null; Out.flush (); Out.close (); out = null; } catch (Exception e) {log.e ("tag", e.getmessage ()); }}}</pre>Textureview created when the display picture, and then initialize the player, pre-load the video, if the video file does not exist, from the assets under Copy to SDcard directory, video loading finished hidden pictures, My side of the picture by default is the Android project comes with the picture, You can display the desired picture according to your NEEDS. Activity_main.xml Layout file<pre name="code" class="html"><pre name="code" class="html"><relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http// Schemas.android.com/tools " android:layout_width=" match_parent " android:layout_height=" match_parent " > <textureview android:id= "@+id/textureview" android:layout_width= "wrap_content" Android : layout_height= "wrap_content"/> <imageview android:id= "@+id/video_image" android:layout_ Width= "match_parent" android:layout_height= "match_parent" android:src= "@drawable/ic_launcher"/> </RelativeLayout></pre></pre>Put a textureview with a imageview.Textureview Initialize display ImageView ...Hides the ImageView when the video is playing, and does not show a black screen when switching Past. 3. pictures displayed before Playback: pictures displayed after Playback: Copyright Notice: This article for Bo Master original article, without Bo Master permission not Reproduced. Android uses Textureview to play video

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