今天項目中遇到這樣一個需求 ,根據后臺接口里pdf,doc,dwg文檔的地址 是一個URL ,需要根據文檔的url 下載到本地(內部存儲或內存卡)并用手機中能打開該文檔的軟件彈出來并打開,(這里需要做一個緩存,第一次查看這個文檔是在服務器上下載并打開,以后打開不需要下載直接打開本地的文檔)在網上找了些資料 寫了以下代碼,下面分享給大家;
效果圖:
代碼:
這是一個單獨的類 首先接收intent傳過來的url我是用url的后14位作為存儲本地的文件名(這里根據自己服務器的文件命名規則而定) 拿到文件路徑之后 判斷本地是否有此文件 有則打開沒有則從服務器上下載并打開 ;
Intent intent = act.getIntent(); final String Strname = intent.getStringExtra("docurl"); //截取最后14位 作為文件名 String s = Strname.substring(Strname.length()-14); //文件存儲 file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s)); new Thread() { public void run() { File file = new File( file1.getAbsolutePath()); //判斷是否有此文件 if (file.exists()) { //有緩存文件,拿到路徑 直接打開 Message msg = Message.obtain(); msg.obj = haha; msg.what = DOWNLOAD_SUCCESS; handler.sendMessage(msg); mProgressDialog.dismiss(); return; }// 本地沒有此文件 則從網上下載打開 File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);// Log.i("Log",file1.getAbsolutePath()); Message msg = Message.obtain(); if (downloadfile != null) { // 下載成功,安裝.... msg.obj = downloadfile; msg.what = DOWNLOAD_SUCCESS; } else { // 提示用戶下載失敗. msg.what = DOWNLOAD_ERROR; } handler.sendMessage(msg); mProgressDialog.dismiss(); }; }.start();下載文檔代碼;
傳入需要下載的文檔的url 和存入內存的路徑和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(); } }打開文件選擇器
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, "標題")); /** * 彈出選擇框之后 把本activity銷毀 */ finish(); break; case DOWNLOAD_ERROR: Util.showToast(act,"文件加載失敗"); break; } } };整體代碼
public class list_item_doc extends BaseActivity { private ProgressDialog mProgressDialog; // 下載失敗 public static final int DOWNLOAD_ERROR = 2; // 下載成功 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 作為文件名 String s = Strname.substring(Strname.length()-14); //文件存儲 file1 = new File(Environment.getExternalStorageDirectory(), getFileName(s)); new Thread() { public void run() { File haha = new File( file1.getAbsolutePath()); //判斷是否有此文件 if (haha.exists()) { //有緩存文件,拿到路徑 直接打開 Message msg = Message.obtain(); msg.obj = haha; msg.what = DOWNLOAD_SUCCESS; handler.sendMessage(msg); mProgressDialog.dismiss(); return; }// 本地沒有此文件 則從網上下載打開 File downloadfile = downLoad(Strname, file1.getAbsolutePath(), mProgressDialog);// Log.i("Log",file1.getAbsolutePath()); Message msg = Message.obtain(); if (downloadfile != null) { // 下載成功,安裝.... msg.obj = downloadfile; msg.what = DOWNLOAD_SUCCESS; } else { // 提示用戶下載失敗. msg.what = DOWNLOAD_ERROR; } handler.sendMessage(msg); mProgressDialog.dismiss(); }; }.start(); } /** * 下載完成后 直接打開文件 */ 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, "標題")); /** * 彈出選擇框 把本activity銷毀 */ finish(); break; case DOWNLOAD_ERROR: Util.showToast(act,"文件加載失敗"); break; } } };/** * */ /** * 傳入文件 url 文件路徑 和 彈出的dialog 進行 下載文檔 */ 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內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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