Android External Storage Example

by Online Tutorials Library July 13, 2022

Android External Storage Example

Like internal storage, we are able to save or read data from the device external memory such as sdcard. The FileInputStream and FileOutputStream classes are used to read and write data into the file.

Example of reading and writing data in the android external storage

activity_main.xml

Drag the 2 edittexts, 2 textviews and 2 buttons from the pallete, now the activity_main.xml file will like this:

File: activity_main.xml

                                              <button android:id="@+id/button1" android:layout_alignleft="@+id/editText2" android:layout_below="@+id/editText2" android:layout_height="wrap_content" android:layout_marginleft="70dp" android:layout_margintop="16dp" android:layout_width="wrap_content" android:text="save"></button>      <button android:id="@+id/button2" android:layout_alignbaseline="@+id/button1" android:layout_alignbottom="@+id/button1" android:layout_height="wrap_content" android:layout_torightof="@+id/button1" android:layout_width="wrap_content" android:text="read"></button>  

Provide permission for the external storage

You need to provide the WRITE_EXTERNAL_STORAGE permission.

File: Activity_Manifest.xml

Activity class

Let’s write the code to write and read data from the android external storage.

File: MainActivity.java

 package example.tutoraspire.com.externalstorage;  import android.support.v7.app.AppCompatActivity; import android.os.Bundle; 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.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter;  public class MainActivity extends AppCompatActivity {     EditText editTextFileName,editTextData;     Button saveButton,readButton;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          editTextFileName=findViewById(R.id.editText1);         editTextData=findViewById(R.id.editText2);         saveButton=findViewById(R.id.button1);         readButton=findViewById(R.id.button2);          //Performing action on save button         saveButton.setOnClickListener(new View.OnClickListener(){              @Override             public void onClick(View arg0) {                 String filename=editTextFileName.getText().toString();                 String data=editTextData.getText().toString();                  FileOutputStream fos;                 try {                     File myFile = new File(“/sdcard/”+filename);                     myFile.createNewFile();                     FileOutputStream fOut = new FileOutputStream(myFile);                     OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);                     myOutWriter.append(data);                     myOutWriter.close();                     fOut.close();                     Toast.makeText(getApplicationContext(),filename + “saved”,Toast.LENGTH_LONG).show();                 } catch (FileNotFoundException e) {e.printStackTrace();}                 catch (IOException e) {e.printStackTrace();}             }         });          //Performing action on Read Button         readButton.setOnClickListener(new View.OnClickListener(){             @Override             public void onClick(View arg0) {                 String filename=editTextFileName.getText().toString();                 StringBuffer stringBuffer = new StringBuffer();                 String aDataRow = “”;                 String aBuffer = “”;                 try {                     File myFile = new File(“/sdcard/”+filename);                     FileInputStream fIn = new FileInputStream(myFile);                     BufferedReader myReader = new BufferedReader(                             new InputStreamReader(fIn));                     while ((aDataRow = myReader.readLine()) != null) {                         aBuffer += aDataRow + “n”;                     }                     myReader.close();                 } catch (IOException e) {                     e.printStackTrace();                 }                 Toast.makeText(getApplicationContext(),aBuffer,Toast.LENGTH_LONG).show();             }         });     } }  

Android External Storage Example

Android External Storage Example

Example of reading and writing data in the android external storage

activity_main.xml

Provide permission for the external storage

Activity class

Android Internal Storage Example

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