Android：从外部文件夹中读取html文件并在webview中显示

Question

I want to display html files in webview. The html files are placed under this folder of my tab, "file manager/Device storage/Android/webpages. With this code I'm getting null pointer exception probably I am not passing the path correctly. And the second problem I am not getting how to load the webpage in webview.

WebView webView = new WebView(this);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
//webView.loadUrl("file:///android_asset/K1.html");
//setContentView(webView);

File folder = new File("/FileManager/Home/Devicestorage/Android/webpages");
File[] listOfFiles = folder.listFiles();

for (int i = 0; i < listOfFiles.length; i++) {
    if (listOfFiles[i].isFile()) {           
        if(listOfFiles[i].getName().endsWith(".html")){
            System.out.println("File " + listOfFiles[i].getName());
        }
    } else if (listOfFiles[i].isDirectory()) {
        System.out.println("Directory " + listOfFiles[i].getName());
    }
}

Answer 1

Don't know if we can open a file with an absolute path on Android like you did. Here's what I did:

File extDir = context.getExternalFilesDir(null);
String root = extDir.toString();
File myFile = new File(root + "/your_path/your_file");
... open myFile for reading ...

and you would need the external storage permission in the manifest.