Android DataManagement InternalFile

InternalFileWriteReadActivity.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
import android.widget.TextView;
import course.examples.Files.FileWriteAndRead.R;

public class InternalFileWriteReadActivity extends Activity {

	private final static String fileName = "TestFile.txt";
	private String TAG = "InternalFileWriteReadActivity";

	@Override
	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);
		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, "FileNotFoundException");
			}
		}

		
		// Read the data from the text file and display it
		try {
			
			readFile(ll);

		} catch (IOException e) {
			Log.i(TAG, "IOException");
		}
	}

	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();

	}

	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();

	}

}

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.widget.LinearLayout;

import android.widget.TextView;

import course.examples.Files.FileWriteAndRead.R;

public class InternalFileWriteReadActivity extends Activity {

private final static String fileName = "TestFile.txt";

private String TAG = "InternalFileWriteReadActivity";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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, "FileNotFoundException");

}

// Read the data from the text file and display it

try {

readFile(ll);

} catch (IOException e) {

Log.i(TAG, "IOException");

}

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();

}

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();

}

main.xml

<?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>

<?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>