Set a hint to the system about whether this fragment's UI is currently visible to the user. This hint defaults to true and is persistent across fragment instance state save and restore. 
 An app may set this to false to indicate that the fragment's UI is scrolled out of visibility or is otherwise not directly visible to the user. This may be used by the system to prioritize operations such as fragment lifecycle updates or loader ordering behavior. 
 Parameters 
isVisibleToUser true if this fragment's UI is currently visible to the user (default), false if it is not. 

/* 
 * 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; 
  /** 
   * 在這里實現(xiàn)Fragment數(shù)據(jù)的緩加載. 
   * @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(){} 
} 

public class OpenResultFragment extends LazyFragment{ 
  // 標志位，標志已經(jīng)初始化完成。 
  private boolean isPrepared; 
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    Log.d(LOG_TAG, "onCreateView"); 
    View view = inflater.inflate(R.layout.fragment_open_result, container, false); 
    //XXX初始化view的各控件 
  isPrepared = true; 
    lazyLoad(); 
    return view; 
  } 
  @Override 
  protected void lazyLoad() { 
    if(!isPrepared || !isVisible) { 
      return; 
    } 
    //填充各控件的數(shù)據(jù) 
  } 
}