Android SD card Read Simple operation

Package Com.example.sdcardtest;import Java.io.bufferedreader;import Java.io.file;import java.io.FileInputStream; Import Java.io.filenotfoundexception;import Java.io.ioexception;import Java.io.inputstreamreader;import Java.io.randomaccessfile;import Android.app.activity;import Android.os.bundle;import android.os.Environment; Import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.edittext;public class Mainactivity extends Activity {final String file_name = "/baidu/hello.txt"; overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_main); Button read = (button) Findviewbyid (R.id.read); Button write = (button) Findviewbyid (r.id.write), final EditText edit1 = (EditText) Findviewbyid (R.ID.EDITTEXT1); final EditText edit2 = (EditText) Findviewbyid (R.ID.EDITTEXT2);//For write event binding listener Write.setonclicklistener (new Onclicklistener () {public void OnClick (View v) {Write (edit1.gEttext (). toString ()); Edit1.settext ("");}}); /For the Read event binding Listener Read.setonclicklistener (new Onclicklistener () {public void OnClick (View v) {edit2.settext (read ());}});} Public String Read () {if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {File Sdcarddir = Environment.getexternalstoragedirectory (); try {fileinputstream fis = new FileInputStream (sdcarddir.getcanonicalpath () + file_name); BufferedReader br = new BufferedReader (new InputStreamReader (FIS)); StringBuilder sb = new StringBuilder (""); String line = null;while (line = Br.readline ())! = null) {sb.append (line);} Br.close (); return sb.tostring ();} catch (FileNotFoundException e) {e.printstacktrace ();} catch (IOException e) {e.printstacktrace ()}} return null;} public void Write (String content) {if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) { Randomaccessfile RAF = Null;try {//Get the SD card directory file Sdcarddir = Environment.getexternalstoragedirectory (); File TargetFile = new file (sdcarddir.getcanonicalfilE () + file_name), RAF = new Randomaccessfile (targetfile, "RW"), Raf.seek (Targetfile.length ()); Raf.write ( Content.getbytes ());} catch (IOException e) {e.printstacktrace ();} try {raf.close ();} catch (IOException e) {e.printstacktrace ();}}}} ===================== layout file Simple two buttons, nothing to say

Android SD card Read Simple operation