我刚开始使用谷歌的admob，我决定先做一个Hello World应用程序，然后再把它和我的主应用程序结合起来。因此，我只包括了这里所写的依赖项，并编译了应用程序，但这个错误在日志猫中弹出，我的应用程序崩溃了:“（

09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               FATAL EXCEPTION: main
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               Process: com.dame.dane, PID: 10254
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dame.dane/com.dame.dane.MainActivity}: java.lang.ClassCastException: com.dame.dane.MainActivity cannot be cast to com.tapjoy.TJPlacementListener
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3093)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.os.Handler.dispatchMessage(Handler.java:106)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.os.Looper.loop(Looper.java:193)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.ActivityThread.main(ActivityThread.java:6865)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at java.lang.reflect.Method.invoke(Native Method)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:504)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               Caused by: java.lang.ClassCastException: com.dame.dane.MainActivity cannot be cast to com.tapjoy.TJPlacementListener
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at com.dame.dane.MainActivity.onCreate(MainActivity.java:35)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.Activity.performCreate(Activity.java:8606)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.Activity.performCreate(Activity.java:8597)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1289)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2923)
09-06 20:21:07.946 10254 10254 E   AndroidRuntime                               ... 11 more
09-06 20:30:00.338 11818 11818 I   com.dame.dane                                Late-enabling -Xcheck:jni
09-06 20:30:00.537 11818 11818 I   com.dame.dane                                The ClassLoaderContext is a special shared library.
09-06 20:30:00.802 11818 11818 D   OpenGLRenderer                               Skia GL Pipeline
09-06 20:30:00.920 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.hk failed lock verification and will run slower.
09-06 20:30:00.920 11818 11818 W   com.dame.dane                                Common causes for lock verification issues are non-optimized dex code
09-06 20:30:00.920 11818 11818 W   com.dame.dane                                and incorrect proguard optimizations.
09-06 20:30:00.922 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.fz failed lock verification and will run slower.
09-06 20:30:00.934 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.gz failed lock verification and will run slower.
09-06 20:30:00.935 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.hh failed lock verification and will run slower.
09-06 20:30:00.936 11818 11818 I   Tapjoy                                       The debug mode has been enabled
09-06 20:30:00.948 11818 11818 W   com.dame.dane                                Class com.tapjoy.FiveRocksIntegration failed lock verification and will run slower.
09-06 20:30:00.951 11818 11818 W   com.dame.dane                                Class com.tapjoy.FiveRocksIntegration$1 failed lock verification and will run slower.
09-06 20:30:00.984 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.hc failed lock verification and will run slower.
09-06 20:30:01.030 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.b failed lock verification and will run slower.
09-06 20:30:01.036 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.gx failed lock verification and will run slower.
09-06 20:30:01.038 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.hl failed lock verification and will run slower.
09-06 20:30:01.065 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.gy failed lock verification and will run slower.
09-06 20:30:01.066 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.hm$1 failed lock verification and will run slower.
09-06 20:30:01.071 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.ht failed lock verification and will run slower.
09-06 20:30:01.086 11818 11818 E   com.dame.dane                                Invalid ID 0x00000000.
09-06 20:30:01.093 11818 11818 W   com.dame.dane                                Class com.tapjoy.TJContentActivity failed lock verification and will run slower.
09-06 20:30:01.132 11818 11818 I   TapjoyLog                                    TapjoyConnect: Connect Flags:
09-06 20:30:01.132 11818 11818 I   TapjoyLog                                    TapjoyConnect: --------------------
09-06 20:30:01.132 11818 11818 I   TapjoyLog                                    TapjoyConnect: key: TJC_OPTION_PLACEMENT_SERVICE_URL, value: https%3A%2F%2Fplacements.tapjoy.com%2F
09-06 20:30:01.133 11818 11818 I   TapjoyLog                                    TapjoyConnect: key: TJC_OPTION_SERVICE_URL, value: https%3A%2F%2Fws.tapjoyads.com%2F
09-06 20:30:01.133 11818 11818 I   TapjoyLog                                    TapjoyConnect: hostURL: [https://ws.tapjoyads.com/]
09-06 20:30:01.133 11818 11818 I   TapjoyLog                                    TapjoyConnect: redirectDomain: [ws.tapjoyads.com]
09-06 20:30:01.133 11818 11818 I   TapjoyLog                                    TapjoyConnect: --------------------
09-06 20:30:01.136 11818 11849 I   TapjoyLog                                    TapjoyGpsHelper: Looking for Google Play Services...
09-06 20:30:01.136 11818 11849 I   TapjoyLog                                    TapjoyGpsHelper: Packaged Google Play Services found, fetching advertisingID...
09-06 20:30:01.137 11818 11849 I   TapjoyLog                                    TapjoyGpsHelper: Packaged Google Play Services version: 8298000
09-06 20:30:01.137 11818 11818 W   com.dame.dane                                Class com.tapjoy.internal.fl failed lock verification and will run slower.
09-06 20:30:01.138 11818 11818 I   Tapjoy                                       New session started

```java
I know that TapJoy is another ad resource but i cant figure out why is this happening. I also include my short and fresh xml, mainactivity and gradle

package com.Dame.Dane;

import android.app.*;
import android.os.*;

public class MainActivity extends Activity 
{
    //app id=ca-app-pub-5290457881705727~8592165721
    //ad unit-id=ca-app-pub-5290457881705727/5712503908
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center">
    
        <TextView
            android:text="@string/hello_world"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button"/>
    
    </LinearLayout>

    apply plugin: 'com.android.application'
    
    android {
        compileSdkVersion 29
        buildToolsVersion "21.1.0"
    
        defaultConfig {
            applicationId "com.Dame.Dane"
            minSdkVersion 16
            targetSdkVersion 29
            versionCode 1
            versionName "1.0"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            }
        }
    }
    
    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        implementation 'androidx.appcompat:appcompat:1.0.2'
        implementation 'com.google.android.gms:play-services-ads:19.3.0'
    }

请帮助，我甚至无法编译他们给的演示应用程序。