android–FragmentActivity NullPointer在onCreate savedInstanceState Bundle中

概述如果我对应用程序进行后台处理并在一段时间后恢复它,则会收到以下异常.如果我改变方向或背景并立即恢复应用程序(在两种情况下都执行onSaveInstanceState和onCreate),那么savedInstanceStateBundle包含正确的ArrayList,一切正常.02-0514:42:06.254E/AndroidRuntime(24355):

如果我对应用程序进行后台处理并在一段时间后恢复它,则会收到以下异常.
如果我改变方向或背景并立即恢复应用程序(在两种情况下都执行onSaveInstanceState和onCreate),那么savedInstanceState Bundle包含正确的ArrayList,一切正常.

02-05 14:42:06.254 E/AndroidRuntime(24355):
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.savant.donordetailsvIEwpagerTitle/com.savant.donordetailsvIEwpagerTitle.activitIEs.DonorDetailsContainerFragmentActivity}:
java.lang.NullPointerException: expected receiver of type
com.savant.donordetailsvIEwpagerTitle.activitIEs.DonorDetailsContainerFragmentActivity$RunningLoadersList,
but got null

    private class RunningLoadersList extends ArrayList<RunningLoader> implements        Parcelable {    private static final long   serialVersionUID    = 663585476779879096L;    public RunningLoadersList() {    }    @SuppressWarnings("unused")    public RunningLoadersList(Parcel in) {        this();        readFromParcel(in);    }    private voID readFromParcel(Parcel in) {        this.clear();        // First we have to read the List size        int size = in.readInt();        for (int i = 0; i < size; i++) {            RunningLoader r = new RunningLoader(in.readInt(),                    in.readBundle());            this.add(r);        }    }    public int describeContents() {        return 0;    }    public final Parcelable.Creator<RunningLoadersList> CREATOR = new Parcelable.Creator<RunningLoadersList>() {                                                                    public RunningLoadersList createFromParcel(Parcel in) {                                                                        return new RunningLoadersList(in);                                                                    }                                                                    public RunningLoadersList[] newArray(int size) {                                                                        return new RunningLoadersList[size];                                                                    }                                                                };    public voID writetoParcel(Parcel dest, int flags) {        int size = this.size();        // We have to write the List size, we need him recreating the List        dest.writeInt(size);        for (int i = 0; i < size; i++) {            RunningLoader r = this.get(i);            dest.writeInt(r.ID);            dest.writeBundle(r.args);        }    }}static final class RunningLoader {    private final int       ID;    private final Bundle    args;    RunningLoader(int _ID, Bundle _args) {        ID = _ID;        args = _args;    }}    @OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    // This has to be called before setContentVIEw and you must use the    // class in androID.support.v4.vIEw and NOT androID.vIEw    requestwindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);    setContentVIEw(R.layout.main);    Log.d(LOG_TAG, "onCreate");    mAdapter = new VIEwPagerTitleAdapter(getSupportFragmentManager());    mPager = (VIEwPager) findVIEwByID(R.ID.pager);    mPager.setAdapter(mAdapter);    TabPageIndicator indicator = (TabPageIndicator) findVIEwByID(R.ID.tabindicator);    indicator.setVIEwPager(mPager);    // first check if we already have a running loader    if ((savedInstanceState != null)            && savedInstanceState.containsKey("RUNNING_LOADERS")) {        mRunningLoaders = savedInstanceState.getParcelable("RUNNING_LOADERS");    }    if (mRunningLoaders == null) {        mRunningLoaders = new RunningLoadersList();    }    if (mRunningLoaders != null) {        for (int i = 0; i < mRunningLoaders.size(); i++) {            StartLoader(mRunningLoaders.get(i).ID,                    mRunningLoaders.get(i).args);        }    }    if (getSupportLoaderManager().hasRunningLoaders()) {        setProgressbarIndeterminateVisibility(Boolean.TRUE);    } else {        setProgressbarIndeterminateVisibility(Boolean.FALSE);    }}    @OverrIDeprotected voID onSaveInstanceState(Bundle outState) {    super.onSaveInstanceState(outState);    outState.putParcelable("RUNNING_LOADERS", mRunningLoaders);    Log.d(LOG_TAG, "onSaveInstanceState");}

解决方法:

Parcelable.Creator< RunningLoadersList>()必须是这样的静态

public static final Parcelable.Creator<RunningLoadersList> CREATOR = new Parcelable.Creator<RunningLoadersList>() {.......}

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