Sunday, April 17, 2011

How to get file extension using java code

To get extension, we can use the following java code:

int dotposition= file.lastIndexOf(".");
filename_Without_Ext = file.substring(0,dotposition);
ext = file.substring(dotposition + 1, file.length());


Modify last exercise "More for Pick a file using Intent.ACTION_GET_CONTENT", a new class filename is implemented to get file extention and filename without extention.

get file extension using java code

main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/buttonpick"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="- PICK a file -"
/>
<TextView
android:id="@+id/textfile"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/textfolder"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/textfilename"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/textfilename_withoutext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/textfilename_ext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>


main code
package com.exercise.AndroidPick_a_File;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidPick_a_File extends Activity {

TextView textFile, textFileName, textFolder;
TextView textFileName_WithoutExt, textFileName_Ext;

private static final int PICKFILE_RESULT_CODE = 1;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Button buttonPick = (Button)findViewById(R.id.buttonpick);
textFile = (TextView)findViewById(R.id.textfile);
textFolder = (TextView)findViewById(R.id.textfolder);
textFileName = (TextView)findViewById(R.id.textfilename);

textFileName_WithoutExt = (TextView)findViewById(R.id.textfilename_withoutext);
textFileName_Ext = (TextView)findViewById(R.id.textfilename_ext);

buttonPick.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("file/*");
startActivityForResult(intent,PICKFILE_RESULT_CODE);

}});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch(requestCode){
case PICKFILE_RESULT_CODE:
if(resultCode==RESULT_OK){

String FilePath = data.getData().getPath();
String FileName = data.getData().getLastPathSegment();
int lastPos = FilePath.length() - FileName.length();
String Folder = FilePath.substring(0, lastPos);

textFile.setText("Full Path: \n" + FilePath + "\n");
textFolder.setText("Folder: \n" + Folder + "\n");
textFileName.setText("File Name: \n" + FileName + "\n");

filename thisFile = new filename(FileName);
textFileName_WithoutExt.setText("Filename without Ext: " + thisFile.getFilename_Without_Ext());
textFileName_Ext.setText("Ext: " + thisFile.getExt());

}
break;

}
}

private class filename{

String filename_Without_Ext = "";
String ext = "";

filename(String file){
int dotposition= file.lastIndexOf(".");
filename_Without_Ext = file.substring(0,dotposition);
ext = file.substring(dotposition + 1, file.length());
}

String getFilename_Without_Ext(){
return filename_Without_Ext;
}

String getExt(){
return ext;
}
}

}


Download the files.

Related:
- Unzip compressed file, using java.util.zip

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