درگاه بانک

این رو تست کنید :

  WebSettings settings = webView.getSettings();

        settings.setJavaScriptEnabled(true);
        if (Build.VERSION.SDK_INT >= 21) {
            settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
        }

        webView.setWebViewClient(new WebViewClient() {

            @Override
            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
                handler.proceed();
            }
        });

       webView.loadUrl("URL");

این هم کدهایی که مصرف کردم

               WebView webBank = (WebView) findViewById(R.id.webBank);
                WebSettings settings = webBank.getSettings();
                settings.setJavaScriptEnabled(true);
                settings.setDomStorageEnabled(true);
                webBank.setWebViewClient(new MyWebViewClient());
                String postData = "";
                webBank.postUrl("", EncodingUtils.getBytes(postData, "BASE64"));

Manifest :

    <activity
            android:name=".ActivityMain"
            android:allowTaskReparenting="true"
            android:theme="@style/myTheme"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.BROWSABLE" />
                <category android:name="android.intent.category.DEFAULT" />

                <data
                    android:host="buy"
                    android:pathPattern=".*"
                    android:scheme="myApp" />
            </intent-filter>
   </activity>

کد برای باز شدن صفحه در وب ویو 

 public class ActivityPayment extends Activity {

	WebView webViewpay;

	@SuppressLint({ "NewApi", "JavascriptInterface", "SetJavaScriptEnabled" })
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_payment);

		try {
			String amount = getIntent().getExtras().getString("amount");
			String url = "http://mywebsite.ir/peyment.php";
			webViewpay = (WebView) findViewById(R.id.webViewpay);

			WebSettings settings = webViewpay.getSettings();
			settings.setAppCacheEnabled(true);
			settings.setBuiltInZoomControls(true);
			settings.setJavaScriptEnabled(true);
			settings.setDomStorageEnabled(true);
			if (Build.VERSION.SDK_INT >= 21) {
				settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
			}
			webViewpay.setWebViewClient(new MyWebViewClient());
			webViewpay.setWebChromeClient(new WebChromeClient());
			webViewpay.addJavascriptInterface(new PaymentResult(), "Android");
			webViewpay.loadUrl(url);
			/*
			 * ArrayList<ItemData> itemDatas = new
			 * ArrayList<ActivityPayment.ItemData>(); for (int i = 0; i < 10;
			 * i++) { ItemData itemData = new ItemData(); itemData.setItem("" +
			 * i); itemDatas.add(itemData); }
			 */
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/*
	 * public class ItemData { private String item;
	 * 
	 * public String getItem() { return item; }
	 * 
	 * public void setItem(String item) { this.item = item; } }
	 */
	public class PaymentResult {

		public void getresult(String code) {
			Toast.makeText(G.context, "" + code, Toast.LENGTH_SHORT)
					.show();
			finishactivity();
		}

		public void finishactivity() {
			ActivityPayment.this.finish();
		}
	}
	
	private class MyWebViewClient extends WebViewClient {

		@Override
		public void onReceivedSslError(WebView view, SslErrorHandler handler,
				SslError error) {
			handler.proceed();
		}
	}
}