In this tutorial I have shared a very simple notepad app android example. I have used file handling to read and write data. The notepad consists of three options to create new file, save and open a file. When you click on save or open button an alert dialog opens where you have to enter the file name. Internal memory is used to save the text file. At the end I have shared a link to download the apk for this example so that you can directly install and run it in your phone.
Also Read: How to Make a Calculator App for Android
Simple Notepad App Android Example
MainActivity.java
It contains the actual source code responsible for all the working.
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package com.thecrazyprogrammer.www.notepadapp; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import java.io.FileInputStream; import java.io.FileOutputStream; public class MainActivity extends Activity { Button newButton,saveButton,openButton; EditText text; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); newButton=(Button)findViewById(R.id.newButton); saveButton=(Button)findViewById(R.id.saveButton); openButton=(Button)findViewById(R.id.openButton); text=(EditText)findViewById(R.id.text); } public void buttonAction(View v) { final EditText fileName=new EditText(this); AlertDialog.Builder ad=new AlertDialog.Builder(this); ad.setView(fileName); if (v.getId() == R.id.saveButton) { ad.setMessage("Save File"); ad.setPositiveButton("Save",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { try { FileOutputStream fout=openFileOutput(fileName.getText().toString()+".txt",MODE_WORLD_READABLE); fout.write(text.getText().toString().getBytes()); } catch (Exception e) { Toast.makeText(getApplicationContext(), "Error Occured: "+e,Toast.LENGTH_LONG).show(); } } }); ad.setNegativeButton("Cancel",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); ad.show(); } if(v.getId()==R.id.openButton) { ad.setMessage("Open File"); ad.setPositiveButton("Open",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { int c; text.setText(""); try { FileInputStream fin = openFileInput(fileName.getText().toString()+".txt"); while ((c = fin.read()) != -1) { text.setText((text.getText().toString() + Character.toString((char) c))); } }catch (Exception e) { Toast.makeText(getApplicationContext(), "Error Occured: "+e,Toast.LENGTH_LONG).show(); } } }); ad.setNegativeButton("Cancel",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); ad.show(); } if(v.getId()==R.id.newButton) { text.setText(""); } } } |
activity_main.xml
This xml file contains the code for the design of notepad app.
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<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:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.com.thecrazyprogrammer.www.notepadapp" android:orientation="vertical" android:weightSum="10"> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="9" android:orientation="vertical"> <EditText android:layout_width="match_parent" android:layout_height="match_parent" android:inputType="textMultiLine" android:gravity="top" android:id="@+id/text" android:scrollbars = "vertical"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="New" android:id="@+id/newButton" android:layout_weight="1" android:onClick="buttonAction"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Save" android:id="@+id/saveButton" android:onClick="buttonAction" android:layout_weight="1"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Open" android:id="@+id/openButton" android:onClick="buttonAction" android:layout_weight="1"/> </LinearLayout> </LinearLayout> |
If you have any doubts regarding above notepad android example then comment below.
nice guy it helps me so much
great its work in my android studio emulator but its wasn’t work in my real device!
Thanks! Helped me out a lot
How to show all files which is save earlier at click on open button ..???
I want to open up the file I saved with utf-8.
I use swedish language with letters å, ä and ö.
Do anyone know some way to solve that.
Very good example and explaining!
LOG
Good Good. Pls I like u to help me in programming becos I want to no it very well