Android webview載入Html頁面,傳參到Html並獲取返回值
阿新 • • 發佈：2019-02-15
1.Android端程式碼
public class MainActivity extends Activity {
private static final String LOGTAG = "MainActivity"; @SuppressLint("JavascriptInterface") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final WebView myWebView = (WebView) findViewById(R.id.myWebView); WebSettings settings = myWebView.getSettings(); settings.setJavaScriptEnabled(true);//設定JS可用 myWebView.addJavascriptInterface(new JsInteration(), "control");//傳遞物件進行互動 myWebView.setWebChromeClient(new WebChromeClient() {}); myWebView.setWebViewClient(new WebViewClient() { @Override public void onPageFinished(WebView view, String url) {//當頁面載入完成 super.onPageFinished(view, url); if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.KITKAT){//當Android SDK>=4.4時 callEvaluateJavascript(myWebView); }else { callMethod(myWebView); } } }); myWebView.loadUrl("file:///android_asset/js_java_interaction.html"); } private void callMethod(WebView webView) { String call = "javascript:sayHello()"; call = "javascript:alertMessage(\"content\")"; // call = "javascript:toastMessage(\"Hello World\")"; //call = "javascript:sumToJava(1,2)"; //call = "javascript:mult1(3,3)"; webView.loadUrl(call); } public class JsInteration { @JavascriptInterface public void toastMessage(String message) { Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show(); } @JavascriptInterface public void onSumResult(int result) { System.out.println(LOGTAG+"_onSumResult result=" + result); } @JavascriptInterface public void onMultResult(int result) { System.out.println(LOGTAG+"_onMultResult result=" + result); } } private void callEvaluateJavascript(WebView webView) { webView.evaluateJavascript("mult2(3,3)", new ValueCallback<String>() { @Override public void onReceiveValue(String value) { System.out.println(LOGTAG+"_onReceiveValue value=" + value); Toast.makeText(MainActivity.this, "onReceiveValue value=" + value, Toast.LENGTH_LONG).show(); }}); }
}
2.Html頁面
<html> <script type="text/javascript">
function sayHello() { alert("Hello") }
function alertMessage(message) { alert(message) }
function toastMessage(message)
{ window.control.toastMessage(message) }
function sumToJava