External Memory in Android

by androindian · September 26, 2016

1703 views.

FilesActivity.Java

package com.example.files;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class FilesActivity extends Activity {

 
 EditText fname,fcontent,fnameread;
    Button write,read;
    TextView filecon;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_files);
        fname = (EditText)findViewById(R.id.fname);
        fcontent = (EditText)findViewById(R.id.ftext);
        fnameread = (EditText)findViewById(R.id.fnameread);
        write = (Button)findViewById(R.id.btnwrite);
        read = (Button)findViewById(R.id.btnread);
        filecon = (TextView)findViewById(R.id.filecon);
        write.setOnClickListener(new View.OnClickListener() {
 
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
        String filename = fname.getText().toString();
        String filecontent = fcontent.getText().toString();
        FileOperations fop = new FileOperations();
        fop.write(filename, filecontent);
        if(fop.write(filename, filecontent)){
        Toast.makeText(getApplicationContext(), filename+".txt created", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(getApplicationContext(), "I/O error", Toast.LENGTH_SHORT).show();
 
        }
        }
    });
    read.setOnClickListener(new View.OnClickListener() {
 
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            String readfilename = fnameread.getText().toString();
            FileOperations fop = new FileOperations();
            String text = fop.read(readfilename);
            if(text != null){
            filecon.setText(text);
            }
            else {
                Toast.makeText(getApplicationContext(), "File not Found", Toast.LENGTH_SHORT).show();
                filecon.setText(null);
            }
 
        }
    });
    }
    }

package com.example.files;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class FilesActivity extends Activity {

EditText fname,fcontent,fnameread;

Button write,read;

TextView filecon;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_files);

fname = (EditText)findViewById(R.id.fname);

fcontent = (EditText)findViewById(R.id.ftext);

fnameread = (EditText)findViewById(R.id.fnameread);

write = (Button)findViewById(R.id.btnwrite);

read = (Button)findViewById(R.id.btnread);

filecon = (TextView)findViewById(R.id.filecon);

write.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

String filename = fname.getText().toString();

String filecontent = fcontent.getText().toString();

FileOperations fop = new FileOperations();

fop.write(filename, filecontent);

if(fop.write(filename, filecontent)){

Toast.makeText(getApplicationContext(), filename+".txt created", Toast.LENGTH_SHORT).show();

}else{

Toast.makeText(getApplicationContext(), "I/O error", Toast.LENGTH_SHORT).show();

}

});

read.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

String readfilename = fnameread.getText().toString();

FileOperations fop = new FileOperations();

String text = fop.read(readfilename);

if(text != null){

filecon.setText(text);

}

else {

Toast.makeText(getApplicationContext(), "File not Found", Toast.LENGTH_SHORT).show();

filecon.setText(null);

}

});

}

FileOperations.Java

package com.example.files;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import android.util.Log;

public class FileOperations {
 
 public FileOperations() {
   
    }

 public Boolean write(String fname, String fcontent){
        try {

            String fpath = "/sdcard/"+fname+".txt";

            File file = new File(fpath);

            // If file does not exists, then create it
            if (!file.exists()) {
                file.createNewFile();
            }

            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write(fcontent);
            bw.close();

            Log.d("Suceess","Sucess");
            return true;

        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }

 }

 public String read(String fname){

     BufferedReader br = null;
     String response = null;

        try {

            StringBuffer output = new StringBuffer();
            String fpath = "/sdcard/"+fname+".txt";

            br = new BufferedReader(new FileReader(fpath));
            String line = "";
            while ((line = br.readLine()) != null) {
                output.append(line +"n");
            }
            response = output.toString();

        } catch (IOException e) {
            e.printStackTrace();
            return null;

        }
        return response;

 }
}

package com.example.files;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import android.util.Log;

public class FileOperations {

public FileOperations() {

}

public Boolean write(String fname, String fcontent){

try {

String fpath = "/sdcard/"+fname+".txt";

File file = new File(fpath);

// If file does not exists, then create it

if (!file.exists()) {

file.createNewFile();

}

FileWriter fw = new FileWriter(file.getAbsoluteFile());

BufferedWriter bw = new BufferedWriter(fw);

bw.write(fcontent);

bw.close();

Log.d("Suceess","Sucess");

return true;

} catch (IOException e) {

e.printStackTrace();

return false;

}

public String read(String fname){

BufferedReader br = null;

String response = null;

try {

StringBuffer output = new StringBuffer();

String fpath = "/sdcard/"+fname+".txt";

br = new BufferedReader(new FileReader(fpath));

String line = "";

while ((line = br.readLine()) != null) {

output.append(line +"n");

}

response = output.toString();

} catch (IOException e) {

e.printStackTrace();

return null;

}

return response;

}

Activity_files.XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center"
    tools:context=".MainActivity" >
 
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textAlignment="center"
        android:text="Android Read/Write File" />
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/fname"
        android:hint="File Name" />
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="100px"
        android:id="@+id/ftext"
        android:hint="File Text" />
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnwrite"
        android:text="Write File" />
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/fnameread"
        android:hint="File Name" />
       <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnread"
        android:text="Read File" />
       <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/filecon" />
 
</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:layout_gravity="center"

tools:context=".MainActivity" >

<TextView