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Practical-10

Mobile Application​

Practical List​

Create an android application to read a file from the sdcard and display that file content on the screen.

Steps​

  1. Create a new Android project in Android Studio.
  2. Open the activity_main.xml layout file.
  3. Add a Button element to the layout with the following attributes:
    • android:id="@+id/button"
    • android:layout_width="wrap_content"
    • android:layout_height="wrap_content"
    • android:text="Read File"
    • android:layout_gravity="center"
  4. Open the MainActivity.java file.
  5. Inside the onCreate method, add the following code to set the content view to the activity_main.xml layout: 
    setContentView(R.layout.activity_main);
  6. Create a new method called readFile to handle the button click event and read the file content: 
    private void readFile() {
        File file = new File(Environment.getExternalStorageDirectory(), "file.txt");
        StringBuilder content = new StringBuilder();
        try {
            BufferedReader reader = new BufferedReader(new FileReader(file));
            String line;
            while ((line = reader.readLine()) != null) {
                content.append(line).append("\n");
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        TextView textView = findViewById(R.id.textView);
        textView.setText(content.toString());
    }
  7. Run the application on an Android device or emulator.
  8. Click the "Read File" button to read the file content and display it on the screen.