Main Activity class import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.List; import org.w3c.dom.Document; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.content.pm.PackageManager; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.GridView; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { ImageButton text,word,pdf; BufferedReader reader = null; StringBuilder builder = null; Button fileclick; File file; Document document; String f1; private static final int REQUEST_PICK_FILE = 1; private TextView mFilePathTextView, ccc; ...