View PDF file by starting activity with intent of ACTION_VIEW

By starting activity with intent of ACTION_VIEW, for "application/pdf", we can ask the installed PDF ready to open PDF file from our app.

package com.exercise.AndroidReadPDF;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

public class AndroidReadPDFActivity extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       String path = "/sdcard/AndroidUsersGuide-2.3.4.pdf";
       File targetFile = new File(path);
       Uri targetUri = Uri.fromFile(targetFile);
      
       Intent intent;
       intent = new Intent(Intent.ACTION_VIEW);
       intent.setDataAndType(targetUri, "application/pdf");
      
       startActivity(intent);
   }
}