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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                # 7.5.4 WebView文件下載 ## 本節引言 > 本節給大家介紹的是WebView下載文件的知識點,當我們在使用普通瀏覽器的時候,比如UC, 當我們點擊到一個可供下載鏈接的時候,就會進行下載,WebView作為一個瀏覽器般的組件, 當然也是支持下載,我們可以自己來寫下載的流程,設置下載后的文件放哪,以什么文件名 保存,當然也可以調用其它內置的瀏覽器來進行下載,比如Chrome,UC等等! 下面給大家演示下用法! ## 1.調用其它瀏覽器下載文件: > 這個很簡單,我們只需為WebView設置setDownloadListener,然后重寫DownloadListener的 onDownloadStart,然后在里面寫個Intent,然后startActivity對應的Activity即可! **關鍵代碼如下**: ``` wView.setDownloadListener(new DownloadListener(){ @Override public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) { Log.e("HEHE","開始下載"); Uri uri = Uri.parse(url); Intent intent = new Intent(Intent.ACTION_VIEW,uri); startActivity(intent); } }); ``` 如果你手機內存在多個瀏覽器的話,會打開一個對話框供你選擇其中一個瀏覽器進行下載~ ## 2.自己寫線程下載文件 > 當然,你可能不想把下載文件放到默認路徑下,或者想自己定義文件名等等,你都可以自己來寫 一個線程來下載文件,實現示例代碼如下: **核心代碼**: 我們自己另外寫一個下載的線程類: **DownLoadThread.java** ``` /** * Created by Jay on 2015/9/14 0014. */ public class DownLoadThread implements Runnable { private String dlUrl; public DownLoadThread(String dlUrl) { this.dlUrl = dlUrl; } @Override public void run() { Log.e("HEHE", "開始下載~~~~~"); InputStream in = null; FileOutputStream fout = null; try { URL httpUrl = new URL(dlUrl); HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); in = conn.getInputStream(); File downloadFile, sdFile; if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { Log.e("HEHE","SD卡可寫"); downloadFile = Environment.getExternalStorageDirectory(); sdFile = new File(downloadFile, "csdn_client.apk"); fout = new FileOutputStream(sdFile); }else{ Log.e("HEHE","SD卡不存在或者不可讀寫"); } byte[] buffer = new byte[1024]; int len; while ((len = in.read(buffer)) != -1) { fout.write(buffer, 0, len); } } catch (Exception e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } if (fout != null) { try { fout.close(); } catch (IOException e) { e.printStackTrace(); } } } Log.e("HEHE", "下載完畢~~~~"); } } ``` 然后**MainActivity.java**中創建并啟動該線程: ``` wView.setDownloadListener(new DownloadListener(){ @Override public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) { Log.e("HEHE","onDownloadStart被調用:下載鏈接:" + url); new Thread(new DownLoadThread(url)).start(); } }); ``` **運行結果**: ![](http://www.runoob.com/wp-content/uploads/2015/09/9992949.jpg) 我們打開SD卡可以看到,下載好的文件已經安安靜靜地躺在SD卡里了: ![](http://www.runoob.com/wp-content/uploads/2015/09/3865809.jpg) **注意事項**: 好的,另外,別忘了寫SD卡的讀寫權限以及Internet訪問網絡的權限: ``` <uses-permission android:name="android.permission.INTERNET"/> <!-- 在SDCard中創建與刪除文件權限 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <!-- 往SDCard寫入數據權限 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> ``` 還有,**in = conn.getInputStream()**;要寫在conn設置完所有東西的后面!!切記,不然什么都讀不了! ## 本節小結: > 本節非常簡單,代碼就不貼出了,其實就是setDownloadListener這個玩意,自己重寫下 onDownloadStart方法來處理下載過程而已~,本節就到這里,謝謝~
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