Android WebView orqali JavaScript-dan Java funksiyasini chaqiring

Bu java kodini bajarish uchun javascriptni olishning eng yaxshi yechimi deb o'ylamayman. Bu yerga qarang:

Agar siz JavaScript orqali qo'ng'iroq qilish mumkin bo'lgan HTML-ga mahalliy kodni ochishni istasangiz, veb-ko'rinish deklaratsiyasida quyidagilarni bajaring:

JavaScriptInterface jsInterface = new JavaScriptInterface(this);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(jsInterface, "JSInterface");

JavaScriptInterface sinfini e'lon qiling:

public class JavaScriptInterface {
    private Activity activity;

    public JavaScriptInterface(Activity activity) {
        this.activity = activity;
    }

    @JavascriptInterface
    public void startVideo(String videoAddress){
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.parse(videoAddress), "video/3gpp"); 
        activity.startActivity(intent);
    }
}

Men videoni o'ynash uchun yagona funktsiyani e'lon qilaman, lekin siz xohlagan narsani qilishingiz mumkin.

Nihoyat, siz buni WebView mazmunida oddiy javascript chaqiruvi orqali chaqirasiz:

<video width="320" height="240" controls="controls" poster='poster.gif'
       onclick="window.JSInterface.startVideo('file:///sdcard/test.3gp');" >
   Your browser does not support the video tag.
</video>

Misol videolarni o'ynash haqida mening boshqa javobimdan olingan, ammo etarlicha tushuntirish kerak.

EDIT @CedricSoubrie sharhiga ko'ra: agar ilovaning maqsadli versiyasi 17 yoki undan yuqori bo'lsa, veb-ko'rinishga eksport qilmoqchi bo'lgan har bir usulning ustiga @JavascriptInterface izohini qo'shishingiz kerak.

Sizning funktsiyangiz "haqiqiy" ni qaytaradi. Bu HTML kodingizning "onclick" xususiyatini rostga tenglashtiradi, shuning uchun tugma "bosilgan" bo'lib qoladi.

"YourJavaScriptInterface" sinfida aniqlangan usullar, "@JavascriptInterface" bilan ochmoqchi bo'lgan har bir usulga izoh qoldirishni unutmang, aks holda usul ishga tushmaydi.

Masalan, quyidagi kod veb-koʻrish sahifasidan qoʻngʻiroqlar uchun Google Cloud Print JavaScript interfeysidan olingan:

        final class PrintDialogJavaScriptInterface {
        @JavascriptInterface
        public String toString() { return JS_INTERFACE; }

        @JavascriptInterface
        public String getType() {
            return cloudPrintIntent.getType();
        }

        @JavascriptInterface
        public String getTitle() {
            return cloudPrintIntent.getExtras().getString("title");
        }

        @JavascriptInterface
        public String getContent() {
            try {
                ContentResolver contentResolver = getActivity().getContentResolver();
                InputStream is = contentResolver.openInputStream(cloudPrintIntent.getData());
                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[4096];
                int n = is.read(buffer);
                while (n >= 0) {
                    baos.write(buffer, 0, n);
                    n = is.read(buffer);
                }
                is.close();
                baos.flush();

                return Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "";
        }

        @JavascriptInterface
        public String getEncoding() {
            return CONTENT_TRANSFER_ENCODING;
        }

        @JavascriptInterface
        public void onPostMessage(String message) {
            if (message.startsWith(CLOSE_POST_MESSAGE_NAME)) {
                finish();
            }
        }
    }