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// DefaultLifecycleObserver实现 "androidx.lifecycle:lifecycle-common-java8:2.0.0"
   
 
   
public class LoadingObserver implements DefaultLifecycleObserver, Handler.Callback {
    /** 显示loading弹窗 */
    private static final int SHOW_LOADING = 0;
    /** 隐藏loading弹窗 */
    private static final int HIDE_LOADING = -1;
    /** 2s后关闭loading弹窗 */
    private static final long DELAY_TIME = 2000L;
    private final Activity mActivity;
    private final String mDataJson;
    private final LoadingViewModel mLoadingViewModel;
    private final WeakHandler mHandler = new WeakHandler(this);
    
    public LoadingObserver(Activity activity, LoadingViewModel shareViewModel, String dataJson) {
        this.mActivity = activity;
        this.mLoadingViewModel = shareViewModel;
        this.mDataJson = dataJson;
    }
    
    public void showLoading() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                hideLoading();
            }
        }, DELAY_TIME);
    }
    
    public void hideLoading() {
        mActivity.findViewById(R.id.loading_layout).setVisibility(View.GONE);
    }
    
    @Override
    public boolean handleMessage(Message message) {
        // 这里可以添加处理消息的逻辑
        return true;
    }
}