Fragment的setUserVisibleHint方法实现懒加载

/*
 * Date: 14-7-17
 * Project: Access-Control-V2
 */
package cn.irains.access_control_v2.common;
import android.support.v4.app.Fragment;
/**
 * Author: msdx (645079761@qq.com)
 * Time: 14-7-17 下午5:46
 */
public abstract class LazyFragment extends Fragment {
    protected boolean isVisible;
    /**
     * 在这里实现Fragment数据的缓加载.
     * @param isVisibleToUser
     */
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if(getUserVisibleHint()) {
            isVisible = true;
            onVisible();
        } else {
            isVisible = false;
            onInvisible();
        }
    }
    protected void onVisible(){
        lazyLoad();
    }
    protected abstract void lazyLoad();
    protected void onInvisible(){}
}