Android Write File to SD card

1. Main. xml

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: layout_width = "match_parent" Android: layout_height = "match_parent" Android: Orientation = "vertical"> <edittext Android: id = "@ + ID/numet" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: hint = "Enter the file name"/> <edittext Android: id = "@ + ID/contentet" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: hint = "Please enter the file content" // prompt text Android: inputtype = "textmultiline" Android: minlines = "3" type = "regxph" text = "yourobjectname"/> // the minimum value is three rows. The value increases automatically when the value is greater than the value: layout_height = "match_parent" Android: Orientation = "horizontal"> <button Android: Id = "@ + ID/sdcbt" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "Save to SD card" Android: onclick = "onclick"/> <button Android: Id = "@ + ID/rombt" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: text = "Save to mobile phone" Android: onclick = "onclick"/> </linearlayout>

2. mainactivity

Package COM. njupt. file1; import android. OS. bundle; import android. OS. environment; import android. app. activity; import android. view. menu; import android. view. view; import android. widget. edittext; import android. widget. toast; public class mainactivity extends activity {private edittext numet; private edittext contentet; @ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); numet = (edittext) findviewbyid (R. id. numet); contentet = (edittext) findviewbyid (R. id. contentet) ;}@ overrideprotected void onresume () {super. onresume (); // environment. getexternalstoragestate (). obtain the status of the SD card and determine whether to install or remove findviewbyid (R. id. sdcbt ). setenabled (environment. getexternalstoragestate (). equals (environment. media_mounted);} @ overridepublic Boolean oncreateoptionsmenu (menu) {// inflate the menu; this adds items to the action bar if it is present. getmenuinflater (). inflate (R. menu. main, menu); Return true;} public void onclick (view v) {try {string name = numet. gettext (). tostring (); string content = contentet. gettext (). tostring (); fileservice service = new fileservice (); Switch (v. GETID () {case R. id. sdcbt: service. savetosdcard (name, content); break; case R. id. rombt: service. savetorom (name, content); break;} toast. maketext (getapplicationcontext (), "saved successfully", toast. length_short ). show ();} catch (exception e) {e. printstacktrace (); toast. maketext (getapplication (), "dacard exception", toast. length_short ). show ();}}}

3. fileservice

Package COM. njupt. file1; import Java. io. file; import Java. io. fileoutputstream; import Java. io. ioexception; import android. OS. environment; public class fileservice {public void savetosdcard (string name, string content) {fileoutputstream Fos = NULL; try {// environment. getexternalstoragedirectory (). Obtain the path file = new file (environment. getexternalstoragedirectory (), name); Fos = new fileoutputstream (File); FOS. write (content. getbytes ();} catch (exception e) {e. printstacktrace ();} finally {try {FOS. close ();} catch (ioexception e) {e. printstacktrace () ;}} public void savetorom (string name, string content) {// todo auto-generated method stub }}

4. androidmanifest. xml

Finally, it is matched with androidmanifest. xml.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>