Android file storage

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

 Packagenet.bwie.localdata.activity;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.os.Bundle;Importandroid.os.Environment;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.util.Log;ImportAndroid.view.View;ImportAndroid.widget.Button;ImportAndroid.widget.TextView;ImportAndroid.widget.Toast;ImportNET.BWIE.LOCALDATA.R;ImportJava.io.BufferedReader;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.InputStreamReader; Public classFileactivityextendsAppcompatactivityImplementsView.onclicklistener {protectedButton mreadfilebtn; protectedButton mwritefilebtn; protectedTextView Mresulttv;  Public Static voidstartactivity (Context context) {context.startactivity (NewIntent (context, fileactivity.class)); } @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate); Super. Setcontentview (R.layout.activity_file);    Initview (); } @Override Public voidOnClick (view view) {if(View.getid () = =r.id.read_file_btn) {String result=ReadFile ();        Mresulttv.settext (result); } Else if(View.getid () = =r.id.write_file_btn)        {WriteFile (); }    }    //Read File    Privatestring ReadFile () {string FilePath= Environment.getexternalstoragedirectory (). GetPath () + "/abc/"; String FileName= "Xyz.txt"; File File=NewFile (FilePath, fileName); BufferedReader BR=NULL; Try{br=NewBufferedReader (NewInputStreamReader (Newfileinputstream (file)); String result= ""; String Line= "";  while(line = Br.readline ())! =NULL) {result+=Line ; }            returnresult; } Catch(Exception e) {e.printstacktrace (); } finally {            if(BR! =NULL) {                Try{br.close (); } Catch(IOException e) {e.printstacktrace (); }            }        }        return NULL; }    //Write File    Private voidWriteFile () {//External Storage Private path: Android folder//String privatePath = Getexternalfilesdir (null). GetPath ();//private paths are not classified as null//String FilePath = PrivatePath + "/abc/"; //External Storage Common path: Dicm,download,music and other system-provided folders//String publicpath = Environment//. Getexternalstoragepublicdirectory (environment.directory_downloads)//. GetPath ();//String FilePath = Publicpath + "/abc/"; //Custom file pathString RootPath = Environment.getexternalstoragedirectory (). GetPath ();//External storage path (root directory)String FilePath = RootPath + "/abc/"; String FileName= "Xyz.txt"; File File=NewFile (FilePath, fileName); FileOutputStream Fos=NULL; Try{fos=Newfileoutputstream (file); Fos.write ("Asdasdas". GetBytes ()); Toast.maketext ( This, "Success", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); LOG.D ("1507", "Error:" +e.getmessage ()); } finally {            if(Fos! =NULL) {                Try{fos.close (); } Catch(IOException e) {e.printstacktrace (); }            }        }    }    Private voidInitview () {mreadfilebtn=(Button) Findviewbyid (R.ID.READ_FILE_BTN); Mreadfilebtn.setonclicklistener (fileactivity. This); MWRITEFILEBTN=(Button) Findviewbyid (R.ID.WRITE_FILE_BTN); Mwritefilebtn.setonclicklistener (fileactivity. This); Mresulttv=(TextView) Findviewbyid (R.ID.RESULT_TV); }}

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= " Http://schemas.android.com/apk/res/android "xmlns:app=" Http://schemas.android.com/apk/res-auto "xmlns:tools=" Http://schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Androi d:orientation= "vertical" tools:context= "net.bwie.localdata.activity.FileActivity" > <button android:id= " @+id/read_file_btn "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android: text= "Read file"/> <button android:id= "@+id/write_file_btn" android:layout_width= "Wrap_content" a        ndroid:layout_height= "Wrap_content" android:text= "Write file"/> <textview android:id= "@+id/result_tv" android:text= "Result" android:layout_width= "wrap_content" android:layout_height= "Wrap_content"/></Line Arlayout> 

　　

Android file storage