Delete file in Internal Storage

Delete file in Internal Storage

Here method deleteFile() delete the given  file associated with this Context's application package.

package com.exercise.AndroidInternalStorage;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidInternalStorageActivity extends Activity {
 
 EditText edFileName, edContent;
 Button btnSave;
 ListView listSavedFiles;
 
 String[] SavedFiles;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        edFileName = (EditText)findViewById(R.id.filename);
        edContent = (EditText)findViewById(R.id.content);
     btnSave = (Button)findViewById(R.id.save);
     listSavedFiles = (ListView)findViewById(R.id.list);
     
     ShowSavedFiles();
     
     btnSave.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    String fileName = edFileName.getText().toString();
    String content = edContent.getText().toString();
    
    FileOutputStream fos;
    try {
     fos = openFileOutput(fileName, Context.MODE_PRIVATE);
     fos.write(content.getBytes());
     fos.close();
     
     Toast.makeText(
       AndroidInternalStorageActivity.this, 
       fileName + " saved", 
       Toast.LENGTH_LONG).show();
     
    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    ShowSavedFiles();
    
   }});
     
     listSavedFiles.setOnItemClickListener(listSavedFilesOnItemClickListener);
     
    }
    
    void ShowSavedFiles(){
     SavedFiles = getApplicationContext().fileList();
     ArrayAdapter<String> adapter
     = new ArrayAdapter<String>(this,
       android.R.layout.simple_list_item_1,
       SavedFiles);
  
     listSavedFiles.setAdapter(adapter);
    }
    
    OnItemClickListener listSavedFilesOnItemClickListener
    = new OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   // TODO Auto-generated method stub
   String clickedFile = (String) parent.getItemAtPosition(position);
   OpenFileDialog(clickedFile);
  }
     
    };
    
    void OpenFileDialog(final String file){
     
     //Read file in Internal Storage
     FileInputStream fis;
     String content = "";
     try {
      fis = openFileInput(file);
      byte[] input = new byte[fis.available()];
      while (fis.read(input) != -1) {}
      content += new String(input);
     } catch (FileNotFoundException e) {
      e.printStackTrace();
     } catch (IOException e) {
      e.printStackTrace(); 
     }
     
     //Create a custom Dialog
     AlertDialog.Builder fileDialog 
     = new AlertDialog.Builder(AndroidInternalStorageActivity.this);
     fileDialog.setTitle(file);
     
     TextView textContent = new TextView(AndroidInternalStorageActivity.this);
     textContent.setText(content);
        LayoutParams textViewLayoutParams 
         = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        textContent.setLayoutParams(textViewLayoutParams);
        
        fileDialog.setView(textContent);
        
        fileDialog.setPositiveButton("OK", null);
        
        //Delete file in Internal Storage
        OnClickListener DeleteListener = new OnClickListener(){

   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    deleteFile(file);
    Toast.makeText(
      AndroidInternalStorageActivity.this, 
      file + " deleted", 
      Toast.LENGTH_LONG).show();
    ShowSavedFiles();
   }
 
        };
  fileDialog.setNeutralButton("DELETE", DeleteListener);
        
        fileDialog.show();
    }
}

Download the files.