java 示例AsyncTaskLoader实现

Posted 2021-05-08

public class MyAsyncTaskLoader extends AsyncTaskLoader<ResponseObject> {
    private String mId;
    private ResponseObject mResponse;

    /**
     * Creates a new {@link MyAsyncTaskLoader}.
     *
     * @param context The context to use.
     * @param id      The ID of the item to load.
     */
    public MyAsyncTaskLoader(@NonNull Context context, @NonNull String id) {
        super(context);
        mId = id;
    }

    @Override
    protected void onStartLoading() {
        if (mResponse != null) {
            deliverResult(mResponse);
        }

        if (mResponse == null || takeContentChanged()) {
            forceLoad();
        }
    }

    @Override
    public ResponseObject loadInBackground() {
        return new ResponseObject(mId); // load then return data
    }

    @Override
    public void deliverResult(ResponseObject response) {
        if (isReset()) {
            return;
        }
        mResponse = response;

        if (isStarted()) {
            super.deliverResult(mResponse);
        }
    }

    @Override
    protected void onReset() {
        onStopLoading();

        if (mResponse != null) {
            mResponse = null;
        }
    }
}