Android Application that writes data to the SD Card

To develop a Android Application that writes data to the SD Card.

Procedure:

Creating a New project:

• Open Android Studio and then click on File -> New -> New project.

• Then type the Application name as “ex.no.9″ and click Next.

• Then select the Minimum SDK as shown below and click Next.

• It will take some time to build and load the project.
• After completion it will look as given below.

Designing layout for the Android Application:

• Click on app -> res -> layout -> activity_main.xml.

• Then delete the code which is there and type the code as given below.

Code for Activity_main.xml:

• Now click on Design and your application will look as given below.

• So now the designing part is completed.

Adding permissions in Manifest for the Android Application:

• Click on app -> manifests -> AndroidManifest.xml

• Now include the WRITE_EXTERNAL_STORAGE permissions in the AndroidManifest.xml file as shown below

Code for AndroidManifest.xml:

• So now the Permissions are added in the Manifest.

Java Coding for the Android Application:

• Click on app -> java -> com.example.exno9 -> MainActivity.

• Then delete the code which is there and type the code as given below.

Code for MainActivity.java:

package com.example.exno9; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStreamReader; public class MainActivity extends AppCompatActivity < EditText e1; Button write,read,clear; @Override protected void onCreate(Bundle savedInstanceState) < super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); e1= (EditText) findViewById(R.id.editText); write= (Button) findViewById(R.id.button); read= (Button) findViewById(R.id.button2); clear= (Button) findViewById(R.id.button3); write.setOnClickListener(new View.OnClickListener() < @Override public void onClick(View v) < String message=e1.getText().toString(); try < File f=new File("/sdcard/myfile.txt"); f.createNewFile(); FileOutputStream fout=new FileOutputStream(f); fout.write(message.getBytes()); fout.close(); Toast.makeText(getBaseContext(),"Data Written in SDCARD",Toast.LENGTH_LONG).show(); >catch (Exception e) < Toast.makeText(getBaseContext(),e.getMessage(),Toast.LENGTH_LONG).show(); >> >); read.setOnClickListener(new View.OnClickListener() < @Override public void onClick(View v) < String message; String buf = ""; try < File f = new File("/sdcard/myfile.txt"); FileInputStream fin = new FileInputStream(f); BufferedReader br = new BufferedReader(new InputStreamReader(fin)); while ((message = br.readLine()) != null) < buf += message; >e1.setText(buf); br.close(); fin.close(); Toast.makeText(getBaseContext(),"Data Recived from SDCARD",Toast.LENGTH_LONG).show(); > catch (Exception e) < Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_LONG).show(); >> >); clear.setOnClickListener(new View.OnClickListener() < @Override public void onClick(View v) < e1.setText(""); >>); > >

• So now the Coding part is also completed.
• Now run the application to see the output.

Output:

Result:

Thus Android Application that writes data to the SD Card is developed and executed successfully.