如何将 Android 中的大型 pdf 文件加载到我的 webview 中

我无法将大型 pdf 文件(有 900 页)加载到我的webview 在我的 android 应用程序中，我尝试使用此代码并在任何其他 pdf，但是当我尝试打开一个较大的 pdf 时，它显示:无预览可用.

i am unable to load a large pdf file (having 900 page) into my webview in my android app, i try this code and working well on any other pdf, but when i try to open a large one it display: No Preview Available.

        wvReport.getSettings().setJavaScriptEnabled(true);
    wvReport.getSettings().setAllowFileAccess(true);
    wvReport.getSettings().setAllowContentAccess(true);

    wvReport.setWebViewClient(new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            return true;
        }
        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);
            Toast.makeText(ReportsViewActivity.this, "Oh no! " , Toast.LENGTH_SHORT).show();
        }

    });

    wvReport.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onProgressChanged(WebView view, int progress) {
            if (progress == 100) {
                progressBar.setVisibility(View.INVISIBLE);
                progressBar.setProgress(0);
            } else {
                progressBar.setVisibility(View.VISIBLE);
                progressBar.setProgress(progress);
            }
        }

        @Override
        public void onReceivedTitle(WebView view, String title) {

        }
    });
    wvReport.loadUrl("http://docs.google.com/viewer?url="+url);