Android 浏览器 —— 使用 WebView 实现文件下载

 mCurrentWebView.setDownloadListener(new DownloadListener() {
    @Override
    public void onDownloadStart(final String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
    　　// TODO 实现下载逻辑
        Log.e("onDownloadStart", "url===" + url + "---userAgent=" + userAgent + "---contentDisposition=" + contentDisposition + "---mimetype=" + mimetype + "---contentLength=" + contentLength);
　　}
});

HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, 5 * 1000);
HttpConnectionParams.setSoTimeout(params, 5 * 1000);
HttpGet httpGet = new HttpGet(url);

try {
    File file = new File(Environment.getExternalStorageDirectory(), fileName);
    if (!file.exists()) {
        file.createNewFile();
    }
    
    RandomAccessFile randomFile = new RandomAccessFile(file, "rw");
    
    HttpResponse response = new DefaultHttpClient(params).execute(httpGet);
    HttpEntity entity = response.getEntity();
    
    InputStream in = entity.getContent();
    randomFile.seek(randomFile.length());
    
    byte[] buffer = new byte[1024];
    int lenght = 0;
    while ((lenght = in.read(buffer)) > 0) {
        randomFile.write(buffer, 0, lenght);
        DebugTraceTool.debugTraceE(this, "file length == " + randomFile.length());
    }
    randomFile.close();
    httpGet.abort();
    
} catch (Exception e) {
    e.printStackTrace();
}