Android Using Internal Storage

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By default, any files that you save to Internal Storage are private to your application. They cannot be accessed by other applications, nor the user under normal circumstances. These files are deleted when the user uninstalls the application.

To Write Text to a File

String fileName= "helloworld";
String textToWrite = "Hello, World!";
FileOutputStream fileOutputStream;

try {
  fileOutputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
} catch (Exception e) {

To Append Text to an Existing File

Use Context.MODE_APPEND for the mode parameter of openFileOutput

fileOutputStream = openFileOutput(fileName, Context.MODE_APPEND);
Strict Mode Policy : A tool to catch the bug in the Compile Time.