Android simple Recorder

Today, when I was working on a simple recorder, the recorder was always unable to be instantiated and used normally. Later I searched for problems, tried them one by one, and finally confirmed that the two settings had been reversed, however, it is depressing that we cannot work normally. I found a tutorial and did not mention it in the tutorial. The two cannot be reversed. Just give yourself a warning and hope to see it, people who do not know this problem can remember. NextCodePut it below:

 

Package COM. recordtest; import Java. io. file; import Java. io. filenamefilter; import Java. io. ioexception; import Java. util. arraylist; import Java. util. list; import android. app. listactivity; import android. media. mediarecorder; import android. OS. bundle; import android. OS. environment; import android. util. log; import android. view. view; import android. widget. arrayadapter; import android. widget. button; import android. wi DGET. toast; public class recordtest extends listactivity {button btn1, btn2; int currertindex = 0; private mediarecorder; // create a recorder file recordfile = NULL; file sdcardpath = NULL; // recording file directory string tempfile = "record_temp _"; List <string> filelist = new arraylist <string> ();/** called when the activity is first created. * // @ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (S Avedinstancestate); setcontentview (R. layout. main); If (environment. getexternalstoragestate (). equals (Android. OS. environment. media_mounted) {sdcardpath = environment. getexternalstoragedirectory (); settitle (sdcardpath. getname ();} else {toast. maketext (recordtest. this, "No SD card", 1000 ). show () ;}getrecordlist (); btn1 = (button) findviewbyid (R. id. btn1); btn2 = (button) findviewbyid (R. id. btn2); btn1.setonclickli Stener (new view. onclicklistener () {public void onclick (view v) {// todo auto-generated method stubtry {recordfile = file. createtempfile (tempfile ,". amr ", sdcardpath); log. I ("AAAAA", "1"); mediarecorder = new mediarecorder (); log. I ("AAAAA", "2"); mediarecorder. setaudiosource (mediarecorder. audiosource. MIC); // set the microphone log. I ("AAAAA", "3"); mediarecorder. setoutputformat (mediarecorder. outputformat. default); // set Output file format log. I ("AAAAA", "4"); mediarecorder. setaudioencoder (mediarecorder. audioencoder. default); // set the encoding format log. I ("AAAAA", "5"); mediarecorder. setoutputfile (recordfile. getabsolutepath (); // use the absolute path to save the file log. I ("AAAAA", "6"); mediarecorder. prepare (); mediarecorder. start (); toast. maketext (recordtest. this, "Start", toast. length_long ). show ();} catch (ioexception e) {// todo auto-generated catch blocke. printstacktr ACE () ;}}); btn2.setonclicklistener (New View. onclicklistener () {public void onclick (view v) {// todo auto-generated method stubtry {If (recordfile! = NULL) {mediarecorder. stop (); filelist. add (recordfile. getname (); arrayadapter <string> List = new arrayadapter <string> (recordtest. this, R. layout. itemlist, R. id. listitem, filelist); setlistadapter (list); mediarecorder = NULL; toast. maketext (recordtest. this, "stop", toast. length_long ). show () ;}} catch (exception e) {log. I ("eeeee", E. getmessage () ;}}) ;}void getrecordlist () {// first check whether sdcardtry {file home = sdcardpath; filelist. clear (); If (home. list (New fileter ()). length> 0) {for (File file: Home. listfiles (New fileter () {filelist. add (file. getname ();} arrayadapter <string> List = new arrayadapter <string> (this, R. layout. itemlist, R. id. listitem, filelist); setlistadapter (list) ;}} catch (exception e) {toast. maketext (recordtest. this, E. getmessage (), 1000 ). show () ;}} class fileter implements filenamefilter {public Boolean accept (File Dir, string filename) {// todo auto-generated method stubreturn filename. equals (". amr ");}}}

during usage, you must add the permission to operate the SD card and use the recording device, that is, in androidmanifest. add in XML:


then you can use it. If you have any questions, please let us know!