android实现按钮获取焦点延迟加载

概述看到京东电视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。

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。

package com.longmaster.iptv.health.DoctorP2P.mode;import androID.content.Context;import androID.support.v7.Widget.linearlayoutmanager;import androID.support.v7.Widget.RecyclerVIEw;import androID.vIEw.KeyEvent;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.linearLayout;import androID.Widget.relativeLayout;import com.longmaster.iptv.health.R;import com.longmaster.iptv.health.common.Constants;import com.longmaster.iptv.health.Widget.MagicTextVIEw.MagicTextVIEw;import org.VIDeoWebInterface.DepartmentParam;import java.util.ArrayList;import java.util.List;import java.util.Timer;import java.util.TimerTask;import cn.longmaster.lmkit.event.MessageProxy;import cn.longmaster.lmkit.utils.AppLogger;/** * Created by yzq on 2017/5/8 */public class buttonAdapter extends RecyclerVIEw.Adapter<buttonAdapter.MyVIEwHolder> {  private List<DepartmentParam> mDepartmentList = new ArrayList<>();  private LayoutInflater mInflater;  private Context mContext;  private boolean mIsLostFocus = false;  private linearlayoutmanager mlinearlayoutmanager;  private RecyclerVIEw mRecyclerVIEw;  private TimerTask mTimerTask;  private Timer mTimer;  private boolean isLoadData = true;  public buttonAdapter(Context context) {    super();    this.mContext = context;    mInflater = LayoutInflater.from(context);  }  public voID setLayoutManager(linearlayoutmanager linearlayoutmanager,RecyclerVIEw re) {    mlinearlayoutmanager = linearlayoutmanager;    mRecyclerVIEw = re;  }  public voID setDepartmentList(List List) {    mDepartmentList = List;  }  public voID setFocus(boolean isFocus) {    mIsLostFocus = isFocus;  }  public voID setIsLoadData(boolean isLoadData) {    this.isLoadData = isLoadData;  }  public voID clear() {    mDepartmentList.clear();  }  @OverrIDe  public int getItemCount() {    return mDepartmentList.size();  }  @OverrIDe  public voID onBindVIEwHolder(final MyVIEwHolder holder,final int position) {    holder.tv.setText(mDepartmentList.get(position).GetDeptname());    holder.tv.setFocusable(true);  }  @OverrIDe  public MyVIEwHolder onCreateVIEwHolder(VIEwGroup parent,int vIEwType) {    VIEw vIEw = mInflater.inflate(R.layout.List_class_item,parent,false);    MyVIEwHolder holder = new MyVIEwHolder(vIEw);    return holder;  }  class MyVIEwHolder extends RecyclerVIEw.VIEwHolder {    MagicTextVIEw tv;    relativeLayout mOuterBgRL;    public MyVIEwHolder(final VIEw vIEw) {      super(vIEw);      RecyclerVIEw.LayoutParams param = (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(new VIEw.OnFocuschangelistener() {        @OverrIDe        public voID onFocusChange(VIEw v,boolean hasFocus) {          if (hasFocus) {            mOuterBgRL.setBackgroundResource(R.drawable.p2p_select);            if (isLoadData) {              mTimerTask = new TimerTask() {                @OverrIDe                public voID run() {                  int iposition = getAdapterposition();                  DepartmentParam departmentParam = mDepartmentList.get(iposition);                  MessageProxy.sendMessage(Constants.Message.P2P_SELECTION_DOCTOR_CLASS,iposition,departmentParam);                }              };              mTimer = new Timer();              mTimer.schedule(mTimerTask,500);            }          } else {            clearTimer();            if (mIsLostFocus) {              mOuterBgRL.setBackgroundResource(R.drawable.p2p_unselect);            }                      }        }      });      tv.setonKeyListener(new VIEw.OnKeyListener() {        @OverrIDe        public boolean onKey(VIEw v,int keyCode,KeyEvent event) {          if (event.getAction() == KeyEvent.ACTION_DOWN) {            int mCurrentSelectposition = getAdapterposition();            int mDepartmentCount = mDepartmentList.size();            AppLogger.e("mCurrentSelectposition>>>>>>>>",mCurrentSelectposition + "----" + mDepartmentCount);            switch (keyCode) {              case KeyEvent.KEYCODE_DPAD_left:                setIsLoadData(true);                setFocus(true);                if (mCurrentSelectposition == (mlinearlayoutmanager.findFirstVisibleItemposition())) {                  mRecyclerVIEw.smoothScrollBy(-400,0);                }                VIEw vIEw1 = mlinearlayoutmanager.findVIEwByposition(mCurrentSelectposition - 1);                if (vIEw1 != null) {                  setVIEwFocus(vIEw1.findVIEwByID(R.ID.class_name));                }                return true;              case KeyEvent.KEYCODE_DPAD_RIGHT:                if (mCurrentSelectposition == mDepartmentCount - 1) {                  return true;                }                setIsLoadData(true);                setFocus(true);                if (mCurrentSelectposition == (mlinearlayoutmanager.findLastVisibleItemposition())) {                  mRecyclerVIEw.smoothScrollBy(400,0);                }                VIEw vIEw = mlinearlayoutmanager.findVIEwByposition(mCurrentSelectposition + 1);                if (vIEw != null) {                  setVIEwFocus(vIEw.findVIEwByID(R.ID.class_name));                }                return true;              case KeyEvent.KEYCODE_BACK:                break;              case KeyEvent.KEYCODE_DPAD_UP:                break;              case KeyEvent.KEYCODE_DPAD_DOWN:                setFocus(false);                mOuterBgRL.setBackgroundResource(R.drawable.p2p_key_down);                break;            }          }          return false;        }      });    }  }  public voID setVIEwFocus(VIEw vIEw) {    vIEw.setFocusable(true);    vIEw.setFocusableIntouchMode(true);    vIEw.requestFocus();    vIEw.requestFocusFromtouch();  }  private voID clearTimer() {    if (mTimer != null) {      mTimer.cancel();    }    if (mTimerTask != null) {      mTimerTask.cancel();    }  }}

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