1.下载PDF文件到本地
private void downFile(String urlString){
try {
URL url = new URL(urlString);
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setRequestMethod("GET");
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
//实现连接
connection.connect();
if (connection.getResponseCode() == 200) {
InputStream is = connection.getInputStream();
//以下为下载操作
byte[] arr = new byte[1];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(baos);
int n = is.read(arr);
while (n > 0) {
bos.write(arr);
n = is.read(arr);
}
bos.close();
String path = Environment.getExternalStorageDirectory()
+ "/download/";
String[] name = urlString.split("/");
path = path + name[name.length - 1];
File file = new File(path);
FileOutputStream fos = new FileOutputStream(file);
fos.write(baos.toByteArray());
fos.close();
//关闭网络连接
connection.disconnect();
Log.d("下载完成","下载完成");
openPDF(file);//打开PDF文件
}
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
2.打开PDF文件
private void openPDF(File file) {
if (file.exists()) {
Log.d("打开","打开");
Uri path1 = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path1, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
startActivity(intent);
}
catch (Exception e) {
Log.d("打开失败","打开失败");
}
}
}
3.新建一个线程调用下载方法
private class MyAsyncTask extends AsyncTask<String, Void, File> {
@Override
protected File doInBackground(String... str) {
return downFile(str[0]);//开始下载
}
@Override
protected void onPostExecute(final File file) {
//下载完成,修改UI
}
}
4.调用
String url = "https://staticzcjb.weibangong.com/pdf/business_license.pdf";
new MyAsyncTask().execute(url, null, null);