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wView.setDownloadListener(new DownloadListener(){
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, 
    String mimetype, long contentLength) {
        Log.e("HEHE","Download started");
        Uri uri = Uri.parse(url);
        Intent intent = new Intent(Intent.ACTION_VIEW,uri);
        startActivity(intent);
    }
});

/**
 * 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", "Download started~~~~~");
        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 card writable");
                downloadFile = Environment.getExternalStorageDirectory();
                sdFile = new File(downloadFile, "csdn_client.apk");
                fout = new FileOutputStream(sdFile);
            }else{
                Log.e("HEHE","SD card not present or not writable");
            }
            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", "Download completed~~~~");
    }
}

wView.setDownloadListener(new DownloadListener(){
    @Override
    public void onDownloadStart(String url, String userAgent, String contentDisposition, 
    String mimetype, long contentLength) {
            Log.e("HEHE","onDownloadStart called: Download link: " + url);
            new Thread(new DownLoadThread(url)).start();
    }
});

<uses-permission android:name="android.permission.INTERNET"/>
<!-- Permission to create and delete files on the SD card -->
&lt;uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- Permission to write to the SD card -->
&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>