我讀過很多帖子,但無法讓我的Android應用程序調用Javascript函數。這是我Android調用Java中的Javascript不起作用
public class BorrameActivity extends AppCompatActivity {
private static BorrameActivity.MyJavaScriptInterface myJavaScriptInterface;
private static WebView webView;
public class MyJavaScriptInterface {
Context mContext;
MyJavaScriptInterface(Context c) {
mContext = c;
}
@android.webkit.JavascriptInterface
public void doEchoTest(String echo){
Log.e("printer", echo);
Toast toast = Toast.makeText(mContext, echo, Toast.LENGTH_SHORT);
toast.show();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_borrame);
myJavaScriptInterface = new BorrameActivity.MyJavaScriptInterface(this);
webView = (WebView) findViewById(R.id.mybrowserAuthorise);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(myJavaScriptInterface, "JSInterface");
webView.loadUrl("file:///android_asset/loginProtocol.html");
//webView.loadUrl("javascript:JSInterface.doEchoTest('test')"); // THIS WORKS!!
webView.loadUrl("javascript:testEcho()"); // THIS DOES NOT WORK
}
}
當我執行
webView.loadUrl("javascript:JSInterface.doEchoTest('test')");
這工作,但在JavaScript函數是loginProtocol.html它不工作:
webView.loadUrl("javascript:testEcho()");
凡
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width; user-scalable=0;" />
<title></title>
</head>
<body style="visibility:visible">
<!-- Used for debugging -->
<h1>HELLO</h1>
<script>
function testEcho(){
JSInterface.doEchoTest('This does not get printed in Android Log');
}
</script>
</body>
</html>
和
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.sedicii.app.sedicii.BorrameActivity">
<WebView
android:id="@+id/mybrowserAuthorise"
android:layout_width="353dp"
android:layout_height="442dp"/>
</LinearLayout>
WebView似乎正在加載(我可以在Android屏幕上看到來自loginProtocol.html的HELLO)。
我缺少什麼?
解決方案 我必須等到HTML頁面加載。由於@KosWarm
webView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
webView.loadUrl("javascript:testEcho()");
}
});
順便說一句,我也試圖與'window.JSInterface .doEchoTest('這不會在Android日誌中打印');'它不起作用 – Mike