由于项目开发需要，需要了一个查看在线PDF的功能，写下这个测试Demo,供以后查阅方便。

1.新建一个Android项目

2.添加依赖类 compile 'es.voghdev.pdfviewpager:library:1.0.3'

3.实现类代码

public classMainActivityextendsAppCompatActivityimplementsDownloadFile.Listener {

privateRemotePDFViewPagerpdfViewPager;

privateEditTexteditText;

privateButtonbutton;

privatePDFPagerAdapteradapter;

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initUI();

setDownloadButtonListener();

}

private voidsetDownloadButtonListener() {

finalContext ctx =this;

finalDownloadFile.Listener listener =this;

button.setOnClickListener(newView.OnClickListener() {

@Override

public voidonClick(View v) {

pdfViewPager=newRemotePDFViewPager(ctx,editText.getText().toString().trim(),listener);

pdfViewPager.setId(R.id.pdf_view);

hideDownloadButton();

}

});

}

private voidinitUI() {

editText= (EditText) findViewById(R.id.urlEdit);

button= (Button) findViewById(R.id.openUrlBtn);

}

@Override

public voidonSuccess(String url,String destinationPath) {

adapter=newPDFPagerAdapter(this,FileUtil.extractFileNameFromURL(url));

pdfViewPager.setAdapter(adapter);

showDownloadButton();

setContentView(pdfViewPager);

}

@Override

public voidonFailure(Exception e) {

e.printStackTrace();

showDownloadButton();

Toast.makeText(this,"下载失败",Toast.LENGTH_SHORT).show();

}

@Override

public voidonProgressUpdate(intprogress, inttotal) {

}

public voidshowDownloadButton() {

button.setVisibility(View.VISIBLE);

}

public voidhideDownloadButton() {

button.setVisibility(View.INVISIBLE);

}

@Override

protected voidonDestroy() {

super.onDestroy();

if(adapter!=null) {

adapter.close();

}

}

}

4.添加权限 网络、读取存储、写存储的权限