Question

我的应用包括同步适配器; 多年来一直运作良好，但最近我收到了一份非常奇怪的崩溃报告：

interface Document {
    mozCancelFullScreen: () => void;
    mozFullScreenElement: Element;
}

ScormApplication.java：

Samsung Galaxy S6 Edge+ (zenlte), 4096MB RAM, Android 7.0

java.lang.ClassCastException:
1. at com.myappid.android.ScormApplication.getApplication (ScormApplication.java:34)
2. at com.myappid.android.sync.SyncAdapter.onPerformSync (SyncAdapter.java:98)
3. at android.content.AbstractThreadedSyncAdapter$SyncThread.run (AbstractThreadedSyncAdapter.java:272)

SyncAdapter.java：

public class ScormApplication extends Application {
    //...
    public static ScormApplication getApplication(Context context) {
        if (context instanceof ScormApplication) {
            return (ScormApplication) context;
        }
        return (ScormApplication) context.getApplicationContext(); // this is a line 34
    }
    //...
}

因此，这意味着调用SyncAdapter上下文的方法public class SyncAdapter extends AbstractThreadedSyncAdapter { //... @Override public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) { // sync code here... ScormApplication.getApplication(getContext()).sendOttoEvent(ottoEvent); // this is a line 98 } }中返回的对象不是我的应用程序类的实例。但是怎么可能呢？

以下是我的代码：

AndroidManifest.xml （未声明单独的流程） ：

getApplicationContext

SyncService.java：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" ...>
    <application ...>
        ...
        <service
            android:name="com.myappid.android.sync.SyncService"
            android:exported="true">
            <intent-filter>
                <action android:name="android.content.SyncAdapter" />
            </intent-filter>
            <meta-data
                android:name="android.content.SyncAdapter"
                android:resource="@xml/syncadapter" />
        </service>
        ...

@ XML / syncadapter：

public class SyncService extends Service {

    private static SyncAdapter sSyncAdapter = null;
    private static final Object sSyncAdapterLock = new Object();

    @Override
    public void onCreate() {
        synchronized (sSyncAdapterLock) {
            if (sSyncAdapter == null) {
                sSyncAdapter = new SyncAdapter(getApplicationContext(), true);
            }
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return sSyncAdapter.getSyncAdapterBinder();
    }
}

在同步适配器上下文中使用getApplicationContext

0 个答案: