Android Saving Files on Internal

Android Saving Files on Internal

This area of storage is sort of private to the application. It is always available to the application and gets purged when the app is uninstalled by the user. Let’s quickly see how to write a file to the internal storage:

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class MainActivity extends Activity {

EditText textmsg;
static final int READ_BLOCK_SIZE = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

textmsg=(EditText)findViewById(R.id.editText1);
}

// write text to file
public void WriteBtn(View v) {
// add-write text into file
try {
FileOutputStream fileout=openFileOutput("mytextfile.txt", MODE_PRIVATE);
OutputStreamWriter outputWriter=new OutputStreamWriter(fileout);
outputWriter.write(textmsg.getText().toString());
outputWriter.close();

//display file saved message
Toast.makeText(getBaseContext(), "File saved successfully!",
Toast.LENGTH_SHORT).show();

} catch (Exception e) {
e.printStackTrace();
}
}

// Read text from file
public void ReadBtn(View v) {
//reading text from file
try {
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);

char[] inputBuffer= new char[READ_BLOCK_SIZE];
String s="";
int charRead;

while ((charRead=InputRead.read(inputBuffer))>0) {
// char to string conversion
String readstring=String.copyValueOf(inputBuffer,0,charRead);
s +=readstring;
}
InputRead.close();
textmsg.setText(s);


} catch (Exception e) {
e.printStackTrace();
}
}
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:padding="5dp"
android:text="Android Read and Write Text from/to a File"
android:textStyle="bold"
android:textSize="28sp" />

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="22dp"
android:minLines="5"
android:layout_margin="5dp">

<requestFocus />
</EditText>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Write Text into File"
android:onClick="WriteBtn"
android:layout_alignTop="@+id/button2"
android:layout_alignRight="@+id/editText1"
android:layout_alignEnd="@+id/editText1" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Read Text From file"
android:onClick="ReadBtn"
android:layout_centerVertical="true"
android:layout_alignLeft="@+id/editText1"
android:layout_alignStart="@+id/editText1" />

</RelativeLayout>

I Am Not The Owner Of These Code .I Merely Have Copied Them From Various Sources. The Only Thing I Did Is That I Am Going To Present Them In More Easy Way To Understand.