External Storage Tutorial In Android Studio With Example

In this tutorial we gonna study about storage of data/files in android external storage or you can say the secondary memory/SD card of your phone. 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ImportantNote:Itisnecessarytoaddexternalstoragethepermissiontoreadandwrite.ForthatyouneedtoaddpermissioninandroidManifestfile. OpenAndroidManifest.xmlfileandaddpermissionstoitjustafterthepackagename. ExternalStorageAvailabilityInAndroidStudio ToavoidcrashingappitisrequiredtocheckbeforewhetherstorageSDcardisavailableforread&writeoperations.getExternalStorageState()methodisusedtodeterminethestateofthestoragemediai.eSDcardismounted,isitreadable,itiswritableetc..allthiskindofinformation. booleanisAvailable=false; booleanisWritable=false; booleanisReadable=false; Stringstate=Environment.getExternalStorageState(); if(Environment.MEDIA_MOUNTED.equals(state)){ //Readandwriteoperationpossible isAvailable=true; isWritable=true; isReadable=true; }elseif(Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)){ //Readoperationpossible isAvailable=true; isWritable=false; isReadable=true; }else{ //SDcardnotmounted isAvailable=false; isWritable=false; isReadable=false;} Methodsto StoreDataInAndroid: getExternalStorageDirectory()–OlderwaytoaccessexternalstorageinAPI Levellessthan7.Itisabsolutenowandnotrecommended.ItdirectlygetthereferencetotherootdirectoryofyourexternalstorageorSDCard. getExternalFilesDir(Stringtype)– Itisrecommendedwaytoenableustocreateprivatefilesspecifictoappandfilesareremovedasappisuninstalled.Exampleisappprivatedata. getExternalStoragePublicDirectory(): Thisis currentrecommendedwaythatenableustokeepfilespublicandarenotdeletedwiththeappuninstallation.Exampleimagesclickedbythecameraexistsevenweuninstallthecameraapp. ExternalStorageExampleInAndroidStudio Belowistheexampletoshowhowusercanuseexternalmemoryfordatastorage.Herewearecreatingtwoactivities,thefirstactivitycontaintheformthatwillstoredatainfileandsecondisusedtoloaddatawhichissaved. DownloadCode Step1:CreateanewprojectandnameitExternalStorageExample. Step2:Openres->layout->activity_main.xml(or)main.xmlandaddfollowingcode: Inthiscodesimplyaddtextview,edittextandbuttonforonclickfunctionality. Step3:Opensrc->package->MainActivity.java InthisstepweopenMainActivityandaddthefunctionsdefinedoverbuttonsonclick.ThesavePrivateandsavePublicfunctiongetthedatafromedittextandsaveitinbyteformatinfile.Alsotoastisusedtodisplaythepathwherefileisstoredwithfilename.Thenextfunctionusesintenttomovetothenextactivityassociatedwithit. ImportantNote:ThereisadifferencewhileretrievingdatawithdifferentAPIlevel.ThepermissionconcepthaschangedsinceAPI23.BeforeAPIlevel23theuserwasaskedduringinstallation,afterAPIlevel23theuserisaskedduringruntime.SoanadditionalruntimepermissionisaddedintheapplicationoperatingovertheAPIlevelabove23. packagecom.example.externalstorageexample; importandroid.Manifest; importandroid.content.Intent; importandroid.os.Environment; importandroid.support.v4.app.ActivityCompat; importandroid.support.v7.app.AppCompatActivity; importandroid.os.Bundle; importandroid.view.View; importandroid.widget.EditText; importandroid.widget.Toast; importjava.io.File; importjava.io.FileOutputStream; importjava.io.IOException; publicclassMainActivityextendsAppCompatActivity{ EditTexteditText; privateintSTORAGE_PERMISSION_CODE=23; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editText=(EditText)findViewById(R.id.editText2); } publicvoidnext(Viewview){ Intentintent=newIntent(MainActivity.this,Main2Activity.class); startActivity(intent); } publicvoidsavePublic(Viewview){ //Permissiontoaccessexternalstorage ActivityCompat.requestPermissions(this,newString[]{Manifest.permission.READ_EXTERNAL_STORAGE},STORAGE_PERMISSION_CODE); Stringinfo=editText.getText().toString(); Filefolder=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_ALARMS);//FolderName FilemyFile=newFile(folder,"myData1.txt");//Filename writeData(myFile,info); editText.setText(""); } publicvoidsavePrivate(Viewview){ Stringinfo=editText.getText().toString(); Filefolder=getExternalFilesDir("AbhiAndroid");//FolderName FilemyFile=newFile(folder,"myData2.txt");//Filename writeData(myFile,info); editText.setText(""); } privatevoidwriteData(FilemyFile,Stringdata){ FileOutputStreamfileOutputStream=null; try{ fileOutputStream=newFileOutputStream(myFile); fileOutputStream.write(data.getBytes()); Toast.makeText(this,"Done"+myFile.getAbsolutePath(),Toast.LENGTH_SHORT).show(); }catch(Exceptione){ e.printStackTrace(); }finally{ if(fileOutputStream!=null){ try{ fileOutputStream.close(); }catch(IOExceptione){ e.printStackTrace(); } } } } } Step4:Openres->layout->activity_main2.xml(or)main2.xmlandaddfollowingcode: Inthisactivitythelayoutisjustsimilarwiththemain.xml. Step5:Opensrc->package->MainActivity2.java InthisstepweopenMainActivity2andaddthefunctionsdefinedoverbutton’sonclick.ThegetPrivateandgetPublicfunctionretrievethedatafromthefile,addittothebufferandfurthersetthetextoverthetextview’s.The backfunctioncontainintenttomovebacktomainactivity. packagecom.example.externalstorageexample; importandroid.content.Intent; importandroid.os.Environment; importandroid.support.v7.app.AppCompatActivity; importandroid.os.Bundle; importandroid.view.View; importandroid.widget.TextView; importjava.io.*; publicclassMain2ActivityextendsAppCompatActivity{ TextViewshowText; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); showText=(TextView)findViewById(R.id.getText); } publicvoidback(Viewview){ Intentintent=newIntent(Main2Activity.this,MainActivity.class); startActivity(intent); } publicvoidgetPublic(Viewview){ Filefolder=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_ALARMS);//FolderName FilemyFile=newFile(folder,"myData1.txt");//Filename Stringtext=getdata(myFile); if(text!=null){ showText.setText(text); }else{ showText.setText("NoData"); } } publicvoidgetPrivate(Viewview){ Filefolder=getExternalFilesDir("AbhiAndroid");//FolderName FilemyFile=newFile(folder,"myData2.txt");//Filename Stringtext=getdata(myFile); if(text!=null){ showText.setText(text); }else{ showText.setText("NoData"); } } privateStringgetdata(Filemyfile){ FileInputStreamfileInputStream=null; try{ fileInputStream=newFileInputStream(myfile); inti=-1; StringBufferbuffer=newStringBuffer(); while((i=fileInputStream.read())!=-1){ buffer.append((char)i); } returnbuffer.toString(); }catch(Exceptione){ e.printStackTrace(); }finally{ if(fileInputStream!=null){ try{ fileInputStream.close(); }catch(IOExceptione){ e.printStackTrace(); } } } returnnull; } } Output: Nowruntheappandyouwillseeformonthescreen.Adddatainthefieldandsaveit.Furtherclicknexttomovetonextactivityandgetdatathatissavedbeforeaspublicorprivate. DOWNLOADTHISFREE eBook! ThisfreeeBookwillhelpyoumasterthelearningofAndroidAppDevelopmentinAndroidStudio! Name Email Subscribe&DownloadeBookNow>> 3thoughtson“ExternalStorageTutorialInAndroidStudioWithExample” Iwanttojoinyourgroup.whatwillbedotomepleasereplymesir Reply GetingErrorinSave_as_public notsavedataintoExternalStorage sosolvethiserrorassoon Plzdoneedfullasabove Reply Howtosaveandgetaudiodataorvideodata???ifumakeatutorialonthatthenthatwillbeuseful.. Reply LeaveaReplyCancelreplyYouremailaddresswillnotbepublished.Requiredfieldsaremarked*CommentName* Email* Website Savemyname,email,andwebsiteinthisbrowserforthenexttimeIcomment. DOWNLOADTHISFREE eBook! ThisfreeeBookwillhelpyoumasterthelearningofAndroidAppDevelopmentinAndroidStudio! 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