Use mediarecoder to record videos

In addition to recording audio, mediarecoder can also be used to record a video. The procedure is basically the same as that of the recorded audio. However, to record a video, you must not only collect the sound but also the image, you need to use surfaceview to preview and display the image. The following is a simple example. The Code is as follows:

Activity:

Package COM. home. recordvideo; import Java. io. file; import android. app. activity; import android. media. mediarecorder; import android. OS. bundle; import android. OS. environment; import android. view. surfaceholder; import android. view. surfaceview; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; import android. widget. toast; public class recordvedioactivity extends acti Incluimplements onclicklistener {private button recordbtn, stopbtn; // Private file videofile; private mediarecorder mrecorder; // surfaceviewprivate surfaceview sview with video preview displayed; // record whether recording is in progress Private Boolean isrecording; private surfaceholder sholder; @ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); recordbtn = (button) Fin Dviewbyid (R. id. main_btn_record); stopbtn = (button) findviewbyid (R. id. main_btn_stop); // make the stopbtn button unavailable. setenabled (false); stopbtn. setonclicklistener (this); recordbtn. setonclicklistener (this); // obtain surfaceviewsview = (surfaceview) findviewbyid (R. id. main_sview); sholder = sview. getholder (); // you do not need to maintain the sholder for surfaceview settings. settype (surfaceholder. surface_type_push_buffers); // sets the sholder resolution. setfixe Dsize (800,480); // set this component so that the sholder will not be automatically disabled on the screen. setkeepscreenon (true) ;}@ overridepublic void onclick (view v) {If (V = recordbtn) {If (! Environment. media_mounted.equals (environment. getexternalstoragestate () {toast. maketext (recordvedioactivity. This, "the SD card does not exist. Please insert the SD card! ", Toast. length_short ). show (); return;} Try {// create the video file videofile = new file (environment. getexternalstoragedirectory (). getcanonicalfile () + "/yvideo.mp4"); // create the mediarecorder object mrecorder = new mediarecorder (); mrecorder. reset (); // set the mrecorder for collecting sound from the microphone. setaudiosource (mediarecorder. audiosource. MIC); // sets the mrecorder for collecting images from the camera. setvideosource (mediarecorder. videosource. camera); // set the output format of the video file (which must be set before the audio encoding format and image encoding format. setoutputformat (mediarecorder. outputformat. mpeg_4); // sets the audio encoding format mrecorder. setaudioencoder (mediarecorder. audioencoder. default); // sets the image encoding format mrecorder. setvideoencoder (mediarecorder. videoencoder. mpeg_4_sp); mrecorder. setvideosize (800,480); // four mrecorder frames per second. setvideoframerate (4); mrecorder. setoutputfile (videofile. getabsolutepath (); // specifies to use surfaceview to preview the video mrecorder. setpreviewdisplay (sview. getholder (). getsurface (); mrecorder. prepare (); // make record button unavailable recordbtn. setenabled (false); // set the stopbtn button to stopbtn. setenabled (true); isrecording = true; // start recording mrecorder. start (); system. out. println ("----- recording -----");} catch (exception e) {e. printstacktrace () ;}}if (V = stopbtn) {// if the video is being recorded if (isrecording) {// stop recording mrecorder. stop (); // release the resource mrecorder. release (); mrecorder = NULL; // make record buttons available in recordbtn. setenabled (true); // disable the stopbtn button. setenabled (false );}}}}

Layout XML:

<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: layout_width = "match_parent" Android: layout_height = "match_parent" Android: Orientation = "vertical"> <linearlayout Android: layout_width = "match_parent" Android: layout_height = "wrap_content" Android: gravity = "center_horizontal" Android: Orientation = "horizontal"> <button Android: id = "@ + ID/main_btn_record" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "recording video"/> <button Android: id = "@ + ID/main_btn_stop" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: TEXT = "stop recording"/> </linearlayout> <surfaceview Android: Id = "@ + ID/main_sview" Android: layout_width = "match_parent" Android: layout_height = "match_parent"/> </linearlayout>

Add the following permissions:

<! -- Authorize this program to record sound --> <uses-Permission Android: Name = "android. Permission. record_audio"/> <! -- Grant the App the permission to use the camera --> <uses-Permission Android: Name = "android. permission. camera "/> <uses-Permission Android: Name =" android. permission. mount_unmount_filesystems "/> <! -- Grant the program permission to use external storage --> <uses-Permission Android: Name = "android. Permission. write_external_storage"/>