How to Create a new FileOutputStream

FileOutputStream was added in API Level 1
An output stream that writes bytes to a file. If the output file exists, it can be replaced or appended to. If it does not exist, a new file will be created.

1. Declare and Set an OutputStream named myOutputStream and set to null;

2. In the MainActivity.java file, add the following the to imports section.

     import java.io.FileOutputStream;
     import java.io.FileNotFoundException;
     import java.io.IOException;

3. Add the code below to the onCreate method. It must be enclosed in a try/catch. Replace mypackagename with your package name. Replace mySQLiteDatabase.db with your file name. 

try {
myOutputStream = new FileOutputStream("/data/data/mypackagename/mySQLiteDatabase.db");
} catch (FileNotFoundException e) {
    e.printStackTrace();
} finally { if (myOutputStream != null) { try { myOutputStream.close(); } catch (IOException e) {
            e.printStackTrace(); } } }

4. Compile and run!

* Note: myOutputStream.flush() is not needed before the close() because the myOutputStream.close() does a flush and a close.

Resources:

http://developer.android.com/reference/java/io/FileOutputStream.html

http://mobile-development-tutorial.blogspot.com/2012/12/android-external-sqlite-database.html

http://www.mkyong.com/java/how-to-write-to-file-in-java-fileoutputstream-example/

http://stackoverflow.com/questions/7300676/when-to-use-flush-in-java
http://stackoverflow.com/questions/2732260/in-java-when-i-call-outputstream-close-i-always-need-to-call-outputstream-flu

http://docs.oracle.com/javase/tutorial/essential/exceptions/finally.html

How to Declare and Set an OutputStream

OutputStream was added in API Level 1
A writable sink for bytes. Most clients will use output streams that write data to the file system, the network, or to an in-memory byte array.

1. In the MainActivity.java file, add the line below to the imports section.

      import java.io.OutputStream;

2.Add the code below to the onCreate method. This will declare an OutputStream named myOutputStream and set it to null.

OutputStream myOutputStream = null;

3. Compile and run!

Next Recommended Article: How to Create a new FileOutputStream

Resources:

http://developer.android.com/reference/java/io/OutputStream.html
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html

How to Declare and Set an InputStream

InputStream was added in API Level 1

A readable source of bytes.Most clients will use input streams that read data from the file system, the network, or from an in-memory byte array.

1. Create an Android project, if you don't already have one.

2. In the MainActivity.java file, add the line below to the imports section.

      import java.io.InputStream;

3.Add the code below to the onCreate method. This will declare the InputStream and set it to null.

InputStream myInputStream = null; 

4. Compile and run!

Next Recommended Article: How to Open an InputStream

Resources:

http://developer.android.com/reference/java/io/InputStream.html
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html