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   源码介绍

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package com.tutorchen.pdfviewer;

import org.vudroid.pdfdroid.codec.PdfContext;
import org.vudroid.pdfdroid.codec.PdfDocument;
import org.vudroid.pdfdroid.codec.PdfPage;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.Display;
import android.view.Menu;
import android.view.WindowManager;
import android.widget.ImageView;

public class MainActivity extends Activity {
	
	//使用ImageView加载Pdf
	private ImageView pdfimageView;
	
	private PdfContext pdfContext;
	//屏幕大小变量
	private int mScreenWidth;
	private int mScreenHeight;
	private int mPageNum = 2;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		pdfimageView = (ImageView)findViewById(R.id.pdfPageView);
		pdfContext = new PdfContext();
		
		//加载PDf文档:需要指定文件路径
		PdfDocument pdfDocument = pdfContext.openDocument("/mnt/sdcard/PDF/java.pdf");
		
		//解析Pdf页面
		PdfPage pdfPage = pdfDocument.getPage(mPageNum);
		
		//获取屏幕大小
		WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
		Display display = wm.getDefaultDisplay();
		mScreenWidth = display.getWidth();
		mScreenHeight = display.getHeight();
		
		//缩放参数初始化
		RectF rectf = new RectF();
		rectf.bottom = (float)1.0;
		rectf.right = (float)1.0;
		
		//解析页面生成bitmap
		Bitmap bmp = pdfPage.renderBitmap(mScreenWidth, mScreenHeight, rectf);
		pdfimageView.setImageBitmap(bmp);
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}