Jelly Bean 4.2 webview显示问题

Question

我的应用程序没有在我们的Jelly Bean（htc evo 4g lte）上显示它的webview，但是在api 16及更低版本的大多数情况下运行正常。过去几个小时我一直在网上看看，还没有找到一个满意的答案，为什么我的webview不会出现在4.2手机上。

这是MainActivity，

package com.example;

import java.net.URL;
import android.R.color;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Html;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.LinearLayout;

import com.example.*;
import com.google.ads.*;




public class MainActivity extends Activity {


private WebView webView;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //Request an ad
    AdView ad = (AdView) findViewById(R.id.adView);
    ad.loadAd(new AdRequest());

    Button myButton = (Button) findViewById(R.id.button1);
    myButton.setBackgroundColor(0);
    myButton.setBackgroundResource(color.darker_gray);
    myButton.setOnClickListener(new View.OnClickListener() {  
        public void onClick(View v) {  
            Intent sharingIntent = new Intent(Intent.ACTION_SEND);

            sharingIntent.setType("text/html");

            sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, Html.fromHtml("<p>This is the text that will be shared.</p>"));

            startActivity(Intent.createChooser(sharingIntent,"Share using"));  
                }  
    }); 

    webView = (WebView) findViewById(R.id.webView1);
    webView.getSettings().setUseWideViewPort(true);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.addJavascriptInterface(webView, DISPLAY_SERVICE);
    webView.getSettings().setLoadsImagesAutomatically(true);
    webView.getSettings().setLoadWithOverviewMode(true);
    webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
    webView.setScrollbarFadingEnabled(true);
    webView.loadUrl("http://example.com");
    WebView myWebView = (WebView) findViewById(R.id.webView1);
    webView.setBackgroundColor(Color.parseColor("#000000"));
    WebView webView=(WebView)this.findViewById(R.id.webView1);
    Intent intent = new Intent(Intent.ACTION_VIEW);
    webView.getSettings().setAllowFileAccess(true);
    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
    myWebView.onPause();
    webView.getSettings().setSupportZoom(false);
    webView.getSettings().setDisplayZoomControls(false);
    WebView myWebView1 = (WebView) findViewById(R.id.webView1);
    myWebView1.setWebViewClient(new WebViewClient());
    webView.canGoBack();
    WebSettings config = webView.getSettings();
    config.setJavaScriptEnabled(true);


}


    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (webView != null && (keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
        webView.goBack();
        return true;
    }
    return true;


}


}