Question

我收到以下错误：

java.lang.ClassCastException: com.example.cillin.map.AuthenticationApplication cannot be cast to com.example.cillin.map.NBHAuthenticationApplication

这是标记错误的行：

NBHAuthenticationApplication myNBHApp = (NBHAuthenticationApplication) getApplication();

这是该行所在的类：

import android.app.Activity;
import android.os.Bundle;

public class NBHBaseActivity extends Activity
{
    protected NBHAuthService mNBHAuthService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        NBHAuthenticationApplication myNBHApp = (NBHAuthenticationApplication) getApplication();
        myNBHApp.setCurrentNBHActivity(this);
        mNBHAuthService = myNBHApp.getNBHAuthService();
    }
}

这是NBHAuthenticationApplication类：

public class NBHAuthenticationApplication extends Application
{
    private NBHAuthService mNBHAuthService;
    private Activity mCurrentNBHActivity;

    public NBHAuthenticationApplication() {}

    public NBHAuthService getNBHAuthService() {
        if (mNBHAuthService == null) {
            mNBHAuthService = new NBHAuthService(this);
        }
        return mNBHAuthService;
    }

    public void setCurrentNBHActivity(Activity NBHactivity) {
        mCurrentNBHActivity = NBHactivity;
    }

    public Activity getCurrentActivity() {
        return mCurrentNBHActivity;
    }
}

有关此错误发生原因的任何想法？我已将此文件添加到我的清单文件中，如同此错误的类似问题所示，但仍然没有运气..

清单：

<application
        android:largeHeap="true"
        android:name="AuthenticationApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >


        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/. 
        -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />
        <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

        <activity
            android:name=".MapsActivity"
            android:label="@string/title_activity_maps" >

        </activity>
        <activity
            android:name=".MainMenu"
            android:label="@string/MainMenu" >

        </activity>
        <activity
            android:name=".CrimeInput"
            android:label="@string/MainMenu" >
        </activity>
        <activity
            android:name=".CoverPage"
            android:label="@string/MainMenu" >
        </activity>
        <activity
            android:name=".LoggedInActivity"
            android:label="LoggedIn" >
        </activity>
        <activity
            android:name=".RegisterAccountActivity"
            android:label="Register" >
        </activity>
        <activity
            android:name=".BaseActivity"
            android:label="Base" >
        </activity>
        <activity
            android:name=".AuthenticationActivity"
            android:label="Authentication" >
        </activity>
        <activity
            android:name=".NBHBaseActivity"
            android:label="Base" >
        </activity>
        <activity
            android:name=".CustomLoginActivity"
            android:label="Login" >
        </activity>
        <activity
            android:name=".Newsfeed"
            android:label="Login"
            android:windowSoftInputMode="adjustResize">
        </activity>
        <activity
        android:name=".NewsfeedInput"
        android:label="@string/MainMenu" >
    </activity>
        <activity
        android:name=".InfoWindowList"
        android:label="@string/MainMenu" >
    </activity>
        <activity
            android:name=".CrimeStats"
            android:label="@string/MainMenu" >
        </activity>
        <activity
        android:name=".GardaRegister"
        android:label="@string/MainMenu" >
    </activity>
        <activity
            android:name=".GardaLoginActivity"
            android:label="@string/MainMenu" >
        </activity>
        <activity
            android:name=".NeighborhoodRegister"
            android:label="@string/MainMenu" >
        </activity>
        <activity
            android:name=".NeighborhoodLogin"
            android:label="@string/MainMenu" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Answer 1

替换：

android:name="AuthenticationApplication"

使用：

android:name="NBHAuthenticationApplication"

java.lang.ClassCastException：无法将Application1强制转换为Application2

1 个答案: