Android中RecyclerView的item中控制元件的點選事件新增刪除一行、上移下移一行的程式碼實現
阿新 • • 發佈：2019-01-02
Demo展示圖片
佈局程式碼
// (layout)activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context 邏輯程式碼
注：需在module中的dependencies節點下新增：
compile 'com.yanzhenjie:recyclerview-swipe:1.0.4'// MyAdapter
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.yanzhenjie.recyclerview.swipe.SwipeMenuAdapter;
import java.util.List;
public class MyAdapter extends SwipeMenuAdapter<MyAdapter.MyViewHolder> {
private List<String> strList;
private OnItemClickListener mOnItemClickListener;
public MyAdapter(List<String> strList){
this.strList = strList;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
this.mOnItemClickListener = onItemClickListener;
}
@Override
public View onCreateContentView(ViewGroup parent, int viewType) {
return LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item, parent, false);
}
@Override
public MyAdapter.MyViewHolder onCompatCreateViewHolder(View realContentView, int viewType) {
MyViewHolder myViewHolder = new MyViewHolder(realContentView);
myViewHolder.mOnItemClickListener = mOnItemClickListener;
return myViewHolder;
}
@Override
public void onBindViewHolder(MyAdapter.MyViewHolder holder, int position) {
holder.num.setText((position + 1) + "");
holder.data.setText(strList.get(position));
}
@Override
public int getItemCount() {
return strList == null ? 0 : strList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
OnItemClickListener mOnItemClickListener;
TextView num;
TextView data;
TextView add;
TextView del;
TextView up;
TextView down;
public MyViewHolder(View itemView) {
super(itemView);
num = (TextView) itemView.findViewById(R.id.num);
data = (TextView) itemView.findViewById(R.id.data);
add = (TextView) itemView.findViewById(R.id.add);
del = (TextView) itemView.findViewById(R.id.del);
up = (TextView) itemView.findViewById(R.id.up);
down = (TextView) itemView.findViewById(R.id.down);
add.setOnClickListener(this);
del.setOnClickListener(this);
up.setOnClickListener(this);
down.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick(getAdapterPosition() , v);
}
}
}
}
----------------------------------------------------------------------------------------
// OnItemClickListener
import android.view.View;
public interface OnItemClickListener {
void onItemClick(int position , View v);
}
----------------------------------------------------------------------------------------
// MainActivity
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private RecyclerView mRecyclerView;
private Context mContext = MainActivity.this;
private List<String> mStrList;
private MyAdapter mMyAdapter;
private int clickTime = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
}
public void initData(){
mStrList = new ArrayList<>();
for (int i = 0 ; i < 20 ; i++){
mStrList.add(i + "");
}
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);
mMyAdapter = new MyAdapter(mStrList);
// 設定item及item中控制元件的點選事件
mMyAdapter.setOnItemClickListener(onItemClickListener);
mRecyclerView.setAdapter(mMyAdapter);
}
/**
* Item點選監聽
*/
private OnItemClickListener onItemClickListener = new OnItemClickListener() {
@Override
public void onItemClick(int position , View v) {
switch (v.getId()){
case R.id.add:
clickTime++;
Toast.makeText(mContext, "增:" + position, Toast.LENGTH_SHORT).show();
mStrList.add(position+ 1 , "增" + clickTime);
mMyAdapter.notifyDataSetChanged();
Log.i(TAG , "mStrList:" + mStrList.toString());
break;
case R.id.del:
Toast.makeText(mContext, "刪:" + position, Toast.LENGTH_SHORT).show();
mStrList.remove(position);
mMyAdapter.notifyDataSetChanged();
break;
case R.id.up:
if(position == 0){
Toast.makeText(mContext, "已經在頂部,無法移動!:" + position, Toast.LENGTH_SHORT).show();
}else if(position > 0 && position <= mStrList.size()-1){
Toast.makeText(mContext, "上:" + position, Toast.LENGTH_SHORT).show();
swap(mStrList , position , position-1);
mMyAdapter.notifyDataSetChanged();
}
break;
case R.id.down:
if(position == mStrList.size()-1){
Toast.makeText(mContext, "已經在底部,無法移動!:" + position, Toast.LENGTH_SHORT).show();
}else if(position >= 0 && position < mStrList.size()-1){
Toast.makeText(mContext, "下:" + position, Toast.LENGTH_SHORT).show();
swap(mStrList , position , position+1);
mMyAdapter.notifyDataSetChanged();
}
break;
}
}
};
/**
* 集合中兩個元素的交換操作
* @param list
* @param oldPosition
* @param newPosition
* @param <T>
*/
public static <T> void swap(List<T> list, int oldPosition, int newPosition){
if(null == list){
throw new IllegalStateException("The list can not be empty...");
}
T tempElement = list.get(oldPosition);
// 向前移動，前面的元素需要向後移動
if(oldPosition < newPosition){
for(int i = oldPosition; i < newPosition; i++){
list.set(i, list.get(i + 1));
}
list.set(newPosition, tempElement);
}
// 向後移動，後面的元素需要向前移動
if(oldPosition > newPosition){
for(int i = oldPosition; i > newPosition; i--){
list.set(i, list.get(i - 1));
}
list.set(newPosition, tempElement);
}
}
}