android实现按钮获取焦点延迟加载

2023-09-23 22:43:05 74

看到京东电视app的按钮获取焦点后才加载数据，之前网上没找到好的说法，所以自己实现了记录一下以便后续学习。

主要是按钮获取焦点以后，初始化一个定时器Timer延迟500ms加载数据，如果失去焦点，取消这个定时器就ok了。其实原理很简单，下面是我实现的一个效果。

packagecom.longmaster.iptv.health.DoctorP2P.mode;

importandroid.content.Context;
importandroid.support.v7.widget.LinearLayoutManager;
importandroid.support.v7.widget.RecyclerView;
importandroid.view.KeyEvent;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.LinearLayout;
importandroid.widget.RelativeLayout;

importcom.longmaster.iptv.health.R;
importcom.longmaster.iptv.health.common.Constants;
importcom.longmaster.iptv.health.widget.MagicTextView.MagicTextView;

importorg.VideoWebInterface.DepartmentParam;

importjava.util.ArrayList;
importjava.util.List;
importjava.util.Timer;
importjava.util.TimerTask;

importcn.longmaster.lmkit.event.MessageProxy;
importcn.longmaster.lmkit.utils.AppLogger;


/**
*Createdbyyzqon2017/5/8
*/

publicclassButtonAdapterextendsRecyclerView.Adapter{
privateListmDepartmentList=newArrayList<>();
privateLayoutInflatermInflater;
privateContextmContext;
privatebooleanmIsLostFocus=false;
privateLinearLayoutManagermLinearLayoutManager;
privateRecyclerViewmRecyclerView;
privateTimerTaskmTimerTask;
privateTimermTimer;
privatebooleanisLoadData=true;

publicButtonAdapter(Contextcontext){
super();
this.mContext=context;
mInflater=LayoutInflater.from(context);
}

publicvoidsetLayoutManager(LinearLayoutManagerlinearLayoutManager,RecyclerViewre){
mLinearLayoutManager=linearLayoutManager;
mRecyclerView=re;
}

publicvoidsetDepartmentList(Listlist){
mDepartmentList=list;
}

publicvoidsetFocus(booleanisFocus){
mIsLostFocus=isFocus;
}

publicvoidsetIsLoadData(booleanisLoadData){
this.isLoadData=isLoadData;
}

publicvoidclear(){
mDepartmentList.clear();
}

@Override
publicintgetItemCount(){
returnmDepartmentList.size();
}

@Override
publicvoidonBindViewHolder(finalMyViewHolderholder,finalintposition){
holder.tv.setText(mDepartmentList.get(position).GetDeptName());
holder.tv.setFocusable(true);
}

@Override
publicMyViewHolderonCreateViewHolder(ViewGroupparent,intviewType){
Viewview=mInflater.inflate(R.layout.list_class_item,parent,false);
MyViewHolderholder=newMyViewHolder(view);
returnholder;
}


classMyViewHolderextendsRecyclerView.ViewHolder{

MagicTextViewtv;
RelativeLayoutmOuterBgRL;

publicMyViewHolder(finalViewview){
super(view);
RecyclerView.LayoutParamsparam=(RecyclerView.LayoutParams)itemView.getLayoutParams();
param.height=LinearLayout.LayoutParams.WRAP_CONTENT;
param.width=LinearLayout.LayoutParams.MATCH_PARENT;
itemView.setVisibility(View.VISIBLE);

tv=(MagicTextView)view.findViewById(R.id.class_name);
mOuterBgRL=(RelativeLayout)view.findViewById(R.id.rl_class_outer_bg);

tv.setOnFocusChangeListener(newView.OnFocusChangeListener(){
@Override
publicvoidonFocusChange(Viewv,booleanhasFocus){
if(hasFocus){
mOuterBgRL.setBackgroundResource(R.drawable.p2p_select);

if(isLoadData){
mTimerTask=newTimerTask(){
@Override
publicvoidrun(){
intiPosition=getAdapterPosition();
DepartmentParamdepartmentParam=mDepartmentList.get(iPosition);
MessageProxy.sendMessage(Constants.Message.P2P_SELECTION_DOCTOR_CLASS,iPosition,departmentParam);
}
};
mTimer=newTimer();
mTimer.schedule(mTimerTask,500);
}

}else{

clearTimer();

if(mIsLostFocus){
mOuterBgRL.setBackgroundResource(R.drawable.p2p_unselect);
}

}
}
});
tv.setOnKeyListener(newView.OnKeyListener(){
@Override
publicbooleanonKey(Viewv,intkeyCode,KeyEventevent){

if(event.getAction()==KeyEvent.ACTION_DOWN){
intmCurrentSelectPosition=getAdapterPosition();
intmDepartmentCount=mDepartmentList.size();
AppLogger.e("mCurrentSelectPosition>>>>>>>>",mCurrentSelectPosition+"----"+mDepartmentCount);
switch(keyCode){
caseKeyEvent.KEYCODE_DPAD_LEFT:

setIsLoadData(true);
setFocus(true);

if(mCurrentSelectPosition==(mLinearLayoutManager.findFirstVisibleItemPosition())){
mRecyclerView.smoothScrollBy(-400,0);
}

Viewview1=mLinearLayoutManager.findViewByPosition(mCurrentSelectPosition-1);

if(view1!=null){
setViewFocus(view1.findViewById(R.id.class_name));
}

returntrue;
caseKeyEvent.KEYCODE_DPAD_RIGHT:


if(mCurrentSelectPosition==mDepartmentCount-1){
returntrue;
}

setIsLoadData(true);
setFocus(true);

if(mCurrentSelectPosition==(mLinearLayoutManager.findLastVisibleItemPosition())){
mRecyclerView.smoothScrollBy(400,0);
}

Viewview=mLinearLayoutManager.findViewByPosition(mCurrentSelectPosition+1);

if(view!=null){
setViewFocus(view.findViewById(R.id.class_name));
}

returntrue;

caseKeyEvent.KEYCODE_BACK:
break;
caseKeyEvent.KEYCODE_DPAD_UP:
break;
caseKeyEvent.KEYCODE_DPAD_DOWN:
setFocus(false);
mOuterBgRL.setBackgroundResource(R.drawable.p2p_key_down);

break;
}
}
returnfalse;
}
});
}

}

publicvoidsetViewFocus(Viewview){
view.setFocusable(true);
view.setFocusableInTouchMode(true);
view.requestFocus();
view.requestFocusFromTouch();
}

privatevoidclearTimer(){
if(mTimer!=null){
mTimer.cancel();
}
if(mTimerTask!=null){
mTimerTask.cancel();
}

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

android实现按钮获取焦点延迟加载

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