UltimateRecyclerView的使用方法詳解

import android.view.View; import android.widget.TextView;

import com.marshalchen.ultimaterecyclerview.UltimateRecyclerviewViewHolder;

/* Created by dzc on 16/1/22. */ public class StringViewHolder extends UltimateRecyclerviewViewHolder{ public TextView tv; public StringViewHolder(View itemView,boolean isItem) { super(itemView); if(isItem){ tv = (TextView) itemView; } } }</pre>

5.重點來了，所有注釋都在這里

 package github.dzc.apptemplate.recyclerview; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.support.design.widget.FloatingActionButton; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.support.v7.widget.helper.ItemTouchHelper; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.SimpleAdapter; import com.marshalchen.ultimaterecyclerview.UltimateRecyclerView; import com.marshalchen.ultimaterecyclerview.UltimateViewAdapter; import com.marshalchen.ultimaterecyclerview.itemTouchHelper.SimpleItemTouchHelperCallback; import com.marshalchen.ultimaterecyclerview.stickyheadersrecyclerview.StickyRecyclerHeadersDecoration; import java.util.List; import butterknife.Bind; import butterknife.ButterKnife; import github.dzc.apptemplate.BaseActivity; import github.dzc.apptemplate.R; import github.dzc.apptemplate.recyclerview.viewholder.StringViewHolder; public class RecyclerViewActivity extends BaseActivity { @Bind(R.id.recycler_view) UltimateRecyclerView recyclerView; View headerView; private StringAdapter adapter; private Handler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycler_view); ButterKnife.bind(this); handler = new Handler(); recyclerView.setLayoutManager(new LinearLayoutManager(this)); headerView = LayoutInflater.from(this).inflate(R.layout.head_view,null); adapter = new StringAdapter(data); recyclerView.setAdapter(adapter); //為每個item添加頭部的布局 這里運用到的其實就是RecyclerView.ItemDecoration //沒錯 可能一般都是用這個來實現item之間的分隔線的 但是線也是一個view，但這個view夠大的時候，就是一個頭部了 StickyRecyclerHeadersDecoration stickyRecyclerHeadersDecoration = new StickyRecyclerHeadersDecoration(adapter); recyclerView.addItemDecoration(stickyRecyclerHeadersDecoration); ItemTouchHelper.Callback callback = new SimpleItemTouchHelperCallback(adapter){ //這個方法還有別的方法可以重載 可以控制如滑動刪除等功能 @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;//控制拖動的方向 這里設置了智能上下拖動交換位置 final int swipeFlags = ItemTouchHelper.LEFT ;//控制滑動刪除的方向 這里設置了只能左滑刪除 // final int swipeFlags = ItemTouchHelper.LEFT |ItemTouchHelper.RIGHT;//左右滑刪除 return makeMovementFlags(dragFlags, swipeFlags); } @Override public boolean isItemViewSwipeEnabled() { return super.isItemViewSwipeEnabled();//這里控制開啟或關閉item是否可以滑動刪除的功能 } @Override public boolean isLongPressDragEnabled() { return super.isLongPressDragEnabled();//控制長按拖動功能 } }; final ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback); itemTouchHelper.attachToRecyclerView(recyclerView.mRecyclerView); //設置頭部一定要在setAdapter后面，因為這個操作會調用adapter的方法來顯示頭部，如果adapter為null，則出錯 recyclerView.setParallaxHeader(headerView); recyclerView.enableDefaultSwipeRefresh(true);//開啟下拉刷新 recyclerView.enableLoadmore();//開啟上拉加載更多 recyclerView.setDefaultOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { handler.postDelayed(new Runnable() { @Override public void run() { recyclerView.setRefreshing(false); } },2000); } }); } class StringAdapter extends UltimateViewAdapter<StringViewHolder>{ private List<String> stringList; public StringAdapter(List<String> stringList) { this.stringList = stringList; } @Override public StringViewHolder getViewHolder(View view) { return new StringViewHolder(view,false); //這個getViewHolder方法在內部實現中只有在獲取頭部、加載更多、下拉刷新的時候會調用 //直接設置itemView為GONE，所以不需要初始化什么的，只要返回的是個ViewHolder就行 } @Override public StringViewHolder onCreateViewHolder(ViewGroup parent) { View view = LayoutInflater.from(RecyclerViewActivity.this).inflate(R.layout.string_item,null); return new StringViewHolder(view,true); } @Override public int getAdapterItemCount() { return stringList==null?0:stringList.size(); //這里返回的是你的item的個數 不包括頭部和加載view } @Override public long generateHeaderId(int position) { // if (getItem(position).length() > 0) // return getItem(position).charAt(0); // else return -1; if(customHeaderView!=null){ position-=1; } String s = position+""; return s.charAt(0); //為每一項item生成頭部的View，如果返回－1，則不生成，假如多個連續的item返回同一個id， //則只會生成一個頭部View //這里提取position的第一個數作為id //1 10 11 12 14等返回的id是一樣的 為1 } @Override public void onBindViewHolder(StringViewHolder holder, int position) { //一定要加這個判斷 因為UltimateRecyclerView本身有加了頭部和尾部 這個方法返回的是包括頭部和尾部在內的 if (position < getItemCount() && (customHeaderView != null ? position <= stringList.size() : position < stringList.size()) && (customHeaderView != null ? position > 0 : true)) { position -= customHeaderView==null?0:1; holder.tv.setText(stringList.get(position)); } } @Override public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) { View view = LayoutInflater.from(RecyclerViewActivity.this).inflate(R.layout.string_item,null); return new StringViewHolder(view,true); //初始化item的頭部布局 這里為了方便 就直接用StringViewHolder,實際使用可以使用不同于item的布局 } @Override public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) { if(customHeaderView!=null){ position-=1; } ((StringViewHolder)holder).tv.setText("header "+(position+"").charAt(0)); ((StringViewHolder)holder).tv.setTextColor(getResources().getColor(android.R.color.holo_red_dark)); //綁定item頭部view的數據，這里提取每個view的position的第一個數來作為頭部顯示數據 //即10 11 12 13 14這些 返回的是1 //20 21 22等是2 } @Override public void onItemMove(int fromPosition, int toPosition) { swapPositions(data,fromPosition,toPosition); //如果開啟的拖動移動位置的功能 //要重寫這個方法 因為如果不重寫 交換的只是view的位置，數據的位置沒有交換 一拖動，就會變成原來的樣子 super.onItemMove(fromPosition, toPosition); } @Override public void onItemDismiss(int position) { remove(data,position);//控制刪除的 super.onItemDismiss(position); } } }