今天项目中遇到这样一个需求 ,根据后台接口里pdf,doc,dwg文档的地址 是一个URL ,需要根据文档的url 下载到本地(内部存储或内存卡)并用手机中能打开该文档的软件弹出来并打开,(这里需要做一个缓存,第一次查看这个文档是在服务器上下载并打开,以后打开不需要下载直接打开本地的文档)在网上找了些资料 写了以下代码,下面分享给大家;

效果图:

代码:

这是一个单独的类 首先接收intent传过来的url我是用url的后14位作为存储本地的文件名(这里根据自己服务器的文件命名规则而定) 拿到文件路径之后 判断本地是否有此文件 有则打开没有则从服务器上下载并打开 ;

Intent intent = act.getIntent(); final String Strname = intent.getStringExtra("docurl"); //截取最后14位 作为文件名 String s = Strname.substring(Strname.length()-14); //文件存储 file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s)); new Thread() { public void run() { File file = new File( file1.getAbsolutePath()); //判断是否有此文件 if (file.exists()) { //有缓存文件,拿到路径 直接打开 Message msg = Message.obtain(); msg.obj = haha; msg.what = DOWNLOAD_SUCCESS; handler.sendMessage(msg); mProgressDialog.dismiss(); return; }// 本地没有此文件 则从网上下载打开 File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);// Log.i("Log",file1.getAbsolutePath()); Message msg = Message.obtain(); if (downloadfile != null) { // 下载成功,安装.... msg.obj = downloadfile; msg.what = DOWNLOAD_SUCCESS; } else { // 提示用户下载失败. msg.what = DOWNLOAD_ERROR; } handler.sendMessage(msg); mProgressDialog.dismiss(); }; }.start();

下载文档代码;

传入需要下载的文档的url 和存入内存的路径和dialog

public static File downLoad(String serverpath, String savedfilepath, ProgressDialog pd) { try { URL url = new URL(serverpath); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); if (conn.getResponseCode() == 200) { int max = conn.getContentLength(); pd.setMax(max); InputStream is = conn.getInputStream(); File file = new File(savedfilepath); FileOutputStream fos = new FileOutputStream(file); int len = 0; byte[] buffer = new byte[1024]; int total = 0; while ((len = is.read(buffer)) != -1) { fos.write(buffer, 0, len); total += len; pd.setProgress(total); } fos.flush(); fos.close(); is.close(); return file; } else { return null; } } catch (Exception e) { e.printStackTrace(); } }

打开文件选择器

Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case DOWNLOAD_SUCCESS: File file = (File) msg.obj; Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK); intent.setDataAndType (Uri.fromFile(file), "application/pdf");// startActivity(intent); startActivity(Intent.createChooser(intent, "标题")); /** * 弹出选择框之后 把本activity销毁 */ finish(); break; case DOWNLOAD_ERROR: Util.showToast(act,"文件加载失败"); break; } } };

整体代码

public class list_item_doc extends BaseActivity { private ProgressDialog mProgressDialog; // 下载失败 public static final int DOWNLOAD_ERROR = 2; // 下载成功 public static final int DOWNLOAD_SUCCESS = 1; private File file1; @Override protected void onCreate(Bundle arg0) { // TODO Auto-generated method stub super.onCreate(arg0); initView(); } private void initView() { // TODO Auto-generated method stub Intent intent = act.getIntent(); final String Strname = intent.getStringExtra("url"); mProgressDialog = new ProgressDialog(act); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mProgressDialog.setCancelable(false); mProgressDialog.show(); //截取最后14位 作为文件名 String s = Strname.substring(Strname.length()-14); //文件存储 file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s)); new Thread() { public void run() { File haha = new File( file1.getAbsolutePath()); //判断是否有此文件 if (haha.exists()) { //有缓存文件,拿到路径 直接打开 Message msg = Message.obtain(); msg.obj = haha; msg.what = DOWNLOAD_SUCCESS; handler.sendMessage(msg); mProgressDialog.dismiss(); return; }// 本地没有此文件 则从网上下载打开 File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);// Log.i("Log",file1.getAbsolutePath()); Message msg = Message.obtain(); if (downloadfile != null) { // 下载成功,安装.... msg.obj = downloadfile; msg.what = DOWNLOAD_SUCCESS; } else { // 提示用户下载失败. msg.what = DOWNLOAD_ERROR; } handler.sendMessage(msg); mProgressDialog.dismiss(); }; }.start(); } /** * 下载完成后 直接打开文件 */ Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case DOWNLOAD_SUCCESS: File file = (File) msg.obj; Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK); intent.setDataAndType (Uri.fromFile(file), "application/pdf");// startActivity(intent); startActivity(Intent.createChooser(intent, "标题")); /** * 弹出选择框 把本activity销毁 */ finish(); break; case DOWNLOAD_ERROR: Util.showToast(act,"文件加载失败"); break; } } };/** * */ /** * 传入文件 url 文件路径 和 弹出的dialog 进行 下载文档 */ public static File downLoad(String serverpath, String savedfilepath, ProgressDialog pd) { try { URL url = new URL(serverpath); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); if (conn.getResponseCode() == 200) { int max = conn.getContentLength(); pd.setMax(max); InputStream is = conn.getInputStream(); File file = new File(savedfilepath); FileOutputStream fos = new FileOutputStream(file); int len = 0; byte[] buffer = new byte[1024]; int total = 0; while ((len = is.read(buffer)) != -1) { fos.write(buffer, 0, len); total += len; pd.setProgress(total); } fos.flush(); fos.close(); is.close(); return file; } else { return null; } } catch (Exception e) { e.printStackTrace(); return null; } } public static String getFileName(String serverurl) { return serverurl.substring(serverurl.lastIndexOf("/") + 1); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。