尝试调用虚拟方法'；android.content.ContentResolverr android.id.content.Context.getContentesolver（）'；关于nul对象引用

我在我的应用程序中使用Telr SDK，同时使用它向我显示上下文空指针，但我使用了Volley库并在一个由“Application”类扩展的类中编写了一些方法。它一次又一次地向我显示这个错误，因为我使用了由“Application”类扩展的“APPController”类，并在“Application”标记下的清单中注册了它。如果我没有在我的项目中使用'Appcontroller'类，那么Telr网关可以完美运行，但我需要同时使用这两个类。请帮助

代码：

public class AppController extends Application {

public static final String TAG = AppController.class
        .getSimpleName();
private RequestQueue mRequestQueue;
private static AppController mInstance;

@Override
public void onCreate() {
    super.onCreate();
    FontsOverride.setDefaultFont(this, "DEFAULT", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "MONOSPACE", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SERIF", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SANS_SERIF", "fonts/Rubik-Regular.ttf");

    mInstance = this;
}

public static synchronized AppController getInstance() {
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (mRequestQueue == null) {
        mRequestQueue = Volley.newRequestQueue(getApplicationContext());
    }
    return mRequestQueue;
}

public <T> void addToRequestQueue(Request<T> req, String tag) {
    // set the default tag if tag is empty
    req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
    getRequestQueue().add(req);
}

public <T> void addToRequestQueue(Request<T> req) {
    req.setTag(TAG);
    getRequestQueue().add(req);
}

public void cancelPendingRequests(Object tag) {
    if (mRequestQueue != null) {
        mRequestQueue.cancelAll(tag);
    }
}

}

public void sendMessage() {
    Intent intent = new Intent(Demo.this, WebviewActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
    intent.putExtra(WebviewActivity.EXTRA_MESSAGE, getMobileRequest());
    intent.putExtra(WebviewActivity.SUCCESS_ACTIVTY_CLASS_NAME, "com.marketplace.activity.SuccessTransationActivity");
    intent.putExtra(WebviewActivity.FAILED_ACTIVTY_CLASS_NAME, "com.marketplace.activity.FailedTransationActivity");
    intent.putExtra(WebviewActivity.IS_SECURITY_ENABLED, isSecurityEnabled);
    startActivity(intent);
}

 <application
    android:name="com.marketplace.utils.AppController"
    android:allowBackup="true"
    android:hardwareAccelerated="true"
    android:icon="@mipmap/app_icon_rect"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/app_icon_circle"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:replace="android:theme, android:name"
    android:usesCleartextTraffic="true"
    tools:ignore="GoogleAppIndexingWarning">

AppController.java:

public class AppController extends Application {

public static final String TAG = AppController.class
        .getSimpleName();
private RequestQueue mRequestQueue;
private static AppController mInstance;

@Override
public void onCreate() {
    super.onCreate();
    FontsOverride.setDefaultFont(this, "DEFAULT", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "MONOSPACE", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SERIF", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SANS_SERIF", "fonts/Rubik-Regular.ttf");

    mInstance = this;
}

public static synchronized AppController getInstance() {
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (mRequestQueue == null) {
        mRequestQueue = Volley.newRequestQueue(getApplicationContext());
    }
    return mRequestQueue;
}

public <T> void addToRequestQueue(Request<T> req, String tag) {
    // set the default tag if tag is empty
    req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
    getRequestQueue().add(req);
}

public <T> void addToRequestQueue(Request<T> req) {
    req.setTag(TAG);
    getRequestQueue().add(req);
}

public void cancelPendingRequests(Object tag) {
    if (mRequestQueue != null) {
        mRequestQueue.cancelAll(tag);
    }
}

}

public void sendMessage() {
    Intent intent = new Intent(Demo.this, WebviewActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
    intent.putExtra(WebviewActivity.EXTRA_MESSAGE, getMobileRequest());
    intent.putExtra(WebviewActivity.SUCCESS_ACTIVTY_CLASS_NAME, "com.marketplace.activity.SuccessTransationActivity");
    intent.putExtra(WebviewActivity.FAILED_ACTIVTY_CLASS_NAME, "com.marketplace.activity.FailedTransationActivity");
    intent.putExtra(WebviewActivity.IS_SECURITY_ENABLED, isSecurityEnabled);
    startActivity(intent);
}

 <application
    android:name="com.marketplace.utils.AppController"
    android:allowBackup="true"
    android:hardwareAccelerated="true"
    android:icon="@mipmap/app_icon_rect"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/app_icon_circle"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:replace="android:theme, android:name"
    android:usesCleartextTraffic="true"
    tools:ignore="GoogleAppIndexingWarning">

我在以下方面遇到错误：Intent Intent=newintent（Demo.this，WebviewActivity.class）

Manifest.xml:

public class AppController extends Application {

public static final String TAG = AppController.class
        .getSimpleName();
private RequestQueue mRequestQueue;
private static AppController mInstance;

@Override
public void onCreate() {
    super.onCreate();
    FontsOverride.setDefaultFont(this, "DEFAULT", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "MONOSPACE", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SERIF", "fonts/Rubik-Regular.ttf");
    FontsOverride.setDefaultFont(this, "SANS_SERIF", "fonts/Rubik-Regular.ttf");

    mInstance = this;
}

public static synchronized AppController getInstance() {
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (mRequestQueue == null) {
        mRequestQueue = Volley.newRequestQueue(getApplicationContext());
    }
    return mRequestQueue;
}

public <T> void addToRequestQueue(Request<T> req, String tag) {
    // set the default tag if tag is empty
    req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
    getRequestQueue().add(req);
}

public <T> void addToRequestQueue(Request<T> req) {
    req.setTag(TAG);
    getRequestQueue().add(req);
}

public void cancelPendingRequests(Object tag) {
    if (mRequestQueue != null) {
        mRequestQueue.cancelAll(tag);
    }
}

}

public void sendMessage() {
    Intent intent = new Intent(Demo.this, WebviewActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
    intent.putExtra(WebviewActivity.EXTRA_MESSAGE, getMobileRequest());
    intent.putExtra(WebviewActivity.SUCCESS_ACTIVTY_CLASS_NAME, "com.marketplace.activity.SuccessTransationActivity");
    intent.putExtra(WebviewActivity.FAILED_ACTIVTY_CLASS_NAME, "com.marketplace.activity.FailedTransationActivity");
    intent.putExtra(WebviewActivity.IS_SECURITY_ENABLED, isSecurityEnabled);
    startActivity(intent);
}

 <application
    android:name="com.marketplace.utils.AppController"
    android:allowBackup="true"
    android:hardwareAccelerated="true"
    android:icon="@mipmap/app_icon_rect"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/app_icon_circle"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:replace="android:theme, android:name"
    android:usesCleartextTraffic="true"
    tools:ignore="GoogleAppIndexingWarning">

---

对于仍然存在此问题的用户，如果您还没有应用程序类，可以通过创建应用程序类来解决此问题，然后使用Telr Application扩展您的应用程序类，就是这样，它将解决您的问题

public class MyApp extends TelrApplication {
  public void onCreate(){
      super.onCreate();
   }
  }
}

---

对于仍然存在此问题的用户，如果您还没有应用程序类，则可以通过创建应用程序类来解决此问题，然后使用Telr Application扩展应用程序类，就是这样，它将解决您的问题

public class MyApp extends TelrApplication {
  public void onCreate(){
      super.onCreate();
   }
  }
}