应用程序在3秒或更短时间内在Android Studio模拟器中启动后停止并显示错误

Question

我从 WebView load website when online, load local file when offline 的示例中开发了一个应用程序并且已成功安装但现在我收到错误，即启用了Splash屏幕，然后突然停止并显示错误“很遗憾CDPRoutine（！即我的应用程序）已停止“，我不知道我做错了什么......任何帮助都会让我免于疯狂并且会有很大的帮助。 以下是Mainactivity.Java的代码

package com.example.sagar.cdproutine;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {
WebView webView;
Context context;

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


    WebView webView = new WebView( context );
    webView.getSettings().setAppCacheMaxSize( 5 * 1024 * 1024 ); // 5MB
    webView.getSettings().setAppCachePath( getApplicationContext().getCacheDir().getAbsolutePath() );
    webView.getSettings().setAllowFileAccess( true );
    webView.getSettings().setAppCacheEnabled( true );
    webView.getSettings().setJavaScriptEnabled( true );
    webView.getSettings().setCacheMode( WebSettings.LOAD_DEFAULT ); // load online by default



    if ( !isNetworkAvailable() ) { // loading offline
        webView.getSettings().setCacheMode( WebSettings.LOAD_CACHE_ELSE_NETWORK );
    }

    webView.loadUrl( "http://www.google.com" );





}

private boolean isNetworkAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService( CONNECTIVITY_SERVICE );
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}

}

这是Androidmanifest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sagar.cdproutine">

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

<application
android:allowBackup="true"
android:icon="@mipmap/app"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".SplashScreen">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
<activity android:name=".MainActivity"></activity>
</application>

</manifest>

这是错误我正在

        E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.sagar.cdproutine, PID: 6624

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sagar.cdproutine/com.example.sagar.cdproutine.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                            at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                         Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
                                                                            at android.view.ViewConfiguration.get(ViewConfiguration.java:364)
                                                                            at android.view.View.<init>(View.java:3788)
                                                                            at android.view.View.<init>(View.java:3892)
                                                                            at android.view.ViewGroup.<init>(ViewGroup.java:573)
                                                                            at android.widget.AbsoluteLayout.<init>(AbsoluteLayout.java:55)
                                                                            at android.webkit.WebView.<init>(WebView.java:597)
                                                                            at android.webkit.WebView.<init>(WebView.java:542)
                                                                            at android.webkit.WebView.<init>(WebView.java:525)
                                                                            at android.webkit.WebView.<init>(WebView.java:512)
                                                                            at android.webkit.WebView.<init>(WebView.java:502)
                                                                            at com.example.sagar.cdproutine.MainActivity.onCreate(MainActivity.java:26)
                                                                            at android.app.Activity.performCreate(Activity.java:6237)
                                                                            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                            at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                            at android.os.Looper.loop(Looper.java:148) 
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                            at java.lang.reflect.Method.invoke(Native Method) 
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)