This document provides steps to manage data and internal memory in an Android application. It involves creating an XML layout with a scroll view and linear layout, adding code to read and write a text file for data storage, and displaying the read contents in the layout. The writeFile method writes sample text lines to a file, and readFile populates the linear layout by creating text views for each line and adding them to the scrollable view.

1. Data Management, Internal Memory
Step1. Create a newAndroidProject.
Step2. Add the followingcode toyouractivityxml file.
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>
Step3. Add the followingcode intoyour“values.xml file
Step4. Addfollowingcode onthe oncreate methodof youractivity
LinearLayout ll = (LinearLayout) findViewById(R.id.linearLayout);
// Check whether fileName already exists in directory used
// by the openFileOutput() method.
// If the text file doesn't exist, then create it now
if (!getFileStreamPath(fileName).exists()) {
try {
writeFile();
} catch (FileNotFoundException e) {
Log.i(TAG, "FileNotFound");
}
}
// Read the data from the text file and display it
try {
readFile(ll);
} catch (IOException e) {

2. Log.i(TAG, "IOException");
}
Step5. Add the writeFilefunctioninyourmainactivity
private void writeFile() throws FileNotFoundException {
FileOutputStream fos = openFileOutput(fileName, MODE_PRIVATE);
PrintWriter pw = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(fos)));
pw.println("Line 1: This is a test of the File Writing API");
pw.println("Line 2: This is a test of the File Writing API");
pw.println("Line 3: This is a test of the File Writing API");
pw.close();
}
Step6. Add The readFile functioninyourmainactivity
private void readFile(LinearLayout ll) throws IOException {
FileInputStream fis = openFileInput(fileName);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String line = "";
while (null != (line = br.readLine())) {
TextView tv = new TextView(this);
tv.setTextSize(24);
tv.setText(line);
ll.addView(tv);
}
br.close();
}
Step7. Done.