Java WebView loadurl（）-android应用程序

单击webview页面内的按钮时出错。当然，当我点击按钮时，它会变成谷歌网站。下面是代码和错误：-

MainActivity.java

package com.mt.nad.testwebapp;

import android.content.Context;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

private WebView webC;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    webC = (WebView)findViewById(R.id.webView1);
    webC.addJavascriptInterface(new JavaScriptInterface(), "CallJavaAdapter");
    webC.setWebViewClient(new WebViewClient());

    WebSettings webS = webC.getSettings();
    webS.setJavaScriptEnabled(true);

    webC.loadUrl("http://10.0.2.2/test-java-adapter/");
}

   private class JavaScriptInterface{

    JavaScriptInterface() {
    }

    @JavascriptInterface
    public void gotoSite() {
        //Toast.makeText(mContext, url, Toast.LENGTH_SHORT).show();
        webC.clearCache(true);
        webC.loadUrl("http://google.com");
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<TextView android:text="@string/hello_world" android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textView" />

<WebView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/webView1"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

</RelativeLayout>

资料来源：

http://10.0.2.2/test-java-adapter/ (19)

是指

<input type="button" value="Go To Site" onClick="window.CallJavaAdapter.gotoSite()">

如果使用Toast或TextView，在单击按钮时可以更改，但对于WebView loadurl（），它不会加载

我指的是：但仍然没有运气…

改变

@JavascriptInterface
public void gotoSite() {
    //Toast.makeText(mContext, url, Toast.LENGTH_SHORT).show();
    webC.clearCache(true);//Here you call the methond in other thread
    webC.loadUrl("http://google.com");
}

致：

---

为什么白痴会对普通问题投否决票？如果您在代码中添加一些描述/注释，那么它将非常有用

http://10.0.2.2/test-java-adapter/ (19)

<input type="button" value="Go To Site" onClick="window.CallJavaAdapter.gotoSite()">

@JavascriptInterface
public void gotoSite() {
    //Toast.makeText(mContext, url, Toast.LENGTH_SHORT).show();
    webC.clearCache(true);//Here you call the methond in other thread
    webC.loadUrl("http://google.com");
}

@JavascriptInterface
public void gotoSite() {
    //Toast.makeText(mContext, url, Toast.LENGTH_SHORT).show();

    new Handler().post(new Runnable() {
        @Override
        public void run() {
            webC.clearCache(true);//Here you call the methond in UI thread
            webC.loadUrl("http://google.com");
        }
    });

}

private void resetWebUrl(final String url){
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                webView.clearCache(true);//Here you call the methond in UI thread
                webView.loadUrl("www.google.com");
            }
        });
    }