Hi, To day I'm going to write "how to create a file (text file) in Android".
In Eclipse File ---> New ---> Android Project
Type
the ProjectName as “CreateTextFile” and
click “Next”
Choose the SDK version for this
project. I choose Android 4.0.3
Click
“Next"
Type the package Name as
“niro.CreateTextFile” and click “Finish”
In the Package Explorer our project
will display.
Expand our project “CreateTextFile”
and open the "main.xml" file which is in res/layout folder to design our UI.
In this application I add two TextView,
two EditText and a button.
Type the following code in "main.xml"
main.xml
<?xml version="1.0"
encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="File Name" />
<EditText
android:id="@+id/fileName"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Type your Message here" />
<EditText
android:id="@+id/msgBody"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</EditText>
<Button
android:id="@+id/saveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save" />
</LinearLayout>
We need to set permission to write
a file in SD card.
To set permission, Open “AndroidManifest.xml” file and add the following code
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Then open the “CreateTextFileActivity.java”
file to write the code.
CreateTextFileActivity.java
package niro.CreateTextFile;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import
android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class
CreateTextFileActivity extends Activity {
final int ACTIVITY_CHOOSE_FILE = 1;
String
msg;
String
title;
/** Called when the
activity is first created. */
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button
btn = (Button) this.findViewById(R.id.saveButton);
final EditText etTitle =
(EditText)this.findViewById(R.id.fileName);
final EditText etBody =
(EditText) this.findViewById(R.id.msgBody);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
title =
etTitle.getText().toString() + ".txt";
msg =
etBody.getText().toString();
createFileOnSD(title, msg);
}
});
}
public void
createFileOnSD(String fileName, String body) {
try {
File root = new File(Environment.getExternalStorageDirectory(),
"MyFolder");
if (!root.exists()) {
root.mkdirs();
}
File
gpxfile = new File(root, fileName);
FileWriter
writer = new FileWriter(gpxfile);
writer.append(body);
writer.flush();
writer.close();
Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
}
catch (IOException e) {
e.printStackTrace();
// importError =
e.getMessage();
// iError();
}
}
}
After save this program, we need to run this program. I test this
application in my phone instead of emulator.
Then type the File Name as “test” and Type the message
as “This is the body” and click Save button
Now
our application has created a folder, name "MyFolder", and write a text file,
name "test.txt" in that folder.
Open the "test.txt" file
When we go back to home screen, our
application will display on the screen.
