Experiment six play audio and video in the app

Lab Report

Course Name		Mobile Internet development based on Android platform		Date of experiment	April 15, 2016
Name of the experimental project		Play audio and video in the app		Location of the experiment	S30010
Type of experiment		-Verification Type √ design type-comprehensive type		Hours	2
The purpose and requirements of the experiment (the knowledge points which are involved in this experiment and are required to be mastered)
1. Implement audio and video processing in the application. 2. Realize playback audio, audio playback control; 3. Realize playback video, video playback control; 4. Use service services to play music from the project source file.
second, the experimental environment (the hardware equipment and related software used in this experiment)
(1) PC Machine (2) Operating system: Windows XP (3) Software: Eclipse, jdk1.6,android Sdk,adt
Third, the contents and steps of the experiment
1. Create a new project named MediaPlayer 2. Modify the layout file Main.xml 3. Improve Activity Class 4. Create a new service class that uses the service service to play the music in the project source file, enabling the background to continue to play audio.
Four, the experimental results (the experimental source program list and operating results or experimental conclusions, experimental design drawings)
Code: Mainactivity.java class: Public class Mainactivity extends Activity { Private MediaPlayer mediaplayer=New MediaPlayer (); Private TextView TView; Private Button startsourcebtn,startlocalbtn,startinternetbtn,startvideobtn,stopbtn,pausebtn,exitbtn; Private File file; @Override protected void onCreate (Bundle savedinstancestate) { Super. OnCreate (savedinstancestate); Setcontentview (r.layout. Activity_main); tview= (TextView) Findviewbyid (r.id. TextView1); Startsourcebtn= (Button) Findviewbyid (r.id. Startsourcebtn); Startlocalbtn= (Button) Findviewbyid (r.id. Startlocalbtn); Startinternetbtn= (Button) Findviewbyid (r.id. Startinternetbtn); Startvideobtn= (Button) Findviewbyid (r.id. Startvidiobtn); Stopbtn= (Button) Findviewbyid (r.id. Stopbtn); Pausebtn= (Button) Findviewbyid (r.id. Pausebtn); Exitbtn= (Button) Findviewbyid (r.id. Exitbtn); file=New File (environment. getExternalStorageDirectory(). GetPath () + "/nan.mp3"); if (File.exists ()) { Mediaplayer=mediaplayer. Create (Mainactivity. this, Uri. Parse (File.getabsolutepath ())); }Else{ Toast. Maketext (Mainactivity. This, "The file does not exist!" ", Toast. Length_long). Show (); } Startsourcebtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub Mediaplayer=mediaplayer. Create (Mainactivity. this, R.raw. nan); Mediaplayer.start (); } }); Startlocalbtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub Mediaplayer.reset (); Try { Mediaplayer.setdatasource (File.getabsolutepath ()); Mediaplayer.prepare (); Mediaplayer.start (); }catch (IllegalArgumentException e) { TODO: Handle exception E.printstacktrace (); }catch (SecurityException e) { TODO: Handle exception E.printstacktrace (); }catch (IllegalStateException e) { TODO: Handle exception E.printstacktrace (); }catch (IOException e) { TODO: Handle exception E.printstacktrace (); } } }); Startinternetbtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub } }); Startvideobtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub Intent intent=New Intent (); Intent.setclass (mainactivity. this, videoactivity. class); StartActivity (Intent); } }); Stopbtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub if (Mediaplayer.isplaying ()) { Mediaplayer.stop (); } } }); Pausebtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub if (Mediaplayer.isplaying ()) { Mediaplayer.pause (); }Else { Mediaplayer.start (); } } }); Exitbtn.setonclicklistener (new Onclicklistener () { @Override Public void OnClick (View arg0) { TODO auto-generated Method stub if (Mediaplayer.isplaying ()) { Mediaplayer.release (); } } }); } @Override protected void OnDestroy () { TODO auto-generated Method stub if (Mediaplayer.isplaying ()) { Mediaplayer.stop (); } Mediaplayer.release (); Super. OnDestroy (); } @Override Public boolean oncreateoptionsmenu (Menu menu) { Inflate the menu; This adds items to the action bar if it is present. Getmenuinflater (). Inflate (R.menu. Main, menu); return true; } } Videoactivity,java class: Public class Videoactivity extends activity{ Private Videoview video; Private File file; @Override protected void onCreate (Bundle savedinstancestate) { TODO auto-generated Method stub Super. OnCreate (savedinstancestate); Setcontentview (r.layout. Video); video= (Videoview) Findviewbyid (r.id. Video); file=New File ("/"); Mediacontroller mc=New Mediacontroller (videoactivity. this); if (File.exists ()) { Video.setvideopath (File.getabsolutepath ()); Video. Setmediacontroller (MC); Video.requestfocus (); Try { Video.start (); }catch (Exception e) { E.printstacktrace (); } Video.setoncompletionlistener (new Oncompletionlistener () { @Override Public void oncompletion (MediaPlayer arg0) { TODO auto-generated Method stub Toast. Maketext (Videoactivity. This, "video playback finished!" ", Toast. length_short). Show (); } }); }Else{ Toast. Maketext (This, "the video to be played does not exist!") ", Toast. length_short). Show (); } } } Run Result: () Run the initial interface: Play the video:
Five, Experimental summary (analysis of the results of the experiment, experience and improvement of experimental ideas)
The experimental process is more painful, because do not know why, in the open DDNS found storage This folder, the project re-import, found in the open DDNS can find storage this folder. This is the time to import audio files and run programs that can play music from the source files and the local file system. I can't play the video and I don't know where the problem appears.
Experimental reviews
Experimental results			Guide Teacher Signature: Date

Experiment six play audio and video in the app