OnItemListner 、、
package com.dash.project_1511a.inter;
/**
* Created by Dash on 2017/12/25.
*/
public interface OnItemListner {
void onItemClick(int position);
void onItemLongClick(int position);
}
Adapter、、
package com.dash.project_1511a;
import android.content.Context;
import android.graphics.Color;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import com.dash.project_1511a.holder.MyListHolder;
import com.dash.project_1511a.inter.OnItemListner;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Dash on 2017/12/25.
*/
public class MyListAdapter extends RecyclerView.Adapter<MyListHolder> {
private List<String> list;
private Context context;
private List<Integer> heightList = new ArrayList<>();
private OnItemListner onItemListner;
public MyListAdapter(Context context, List<String> list) {
this.context = context;
this.list = list;
//Create random numbers
for (int i = 0;i<list.size();i++){
heightList. add((int) (100+Math.random()*200));
}
}
/**
* onCreateViewHolder The method called when a viewHolder is created.... need to create a viewHolder in this method
* @param parent
* @ param viewType
* @return
*/
@Override
public MyListHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//The view of the item
View view = View.inflate(context,R.layout.list_item_layout,null);
//According to the displayed item View creates viewHolder
MyListHolder myListHolder = new MyListHolder(view);
return myListHolder;
}
/**
* onBindViewHolder.... After binding, do some assignment operations, ,,, textView sets text, imageView sets pictures, button, checkBox sets listening events
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(MyListHolder holder, final int position) {
ViewGroup.LayoutParams layoutParams = holder.textView.getLayoutParams();
layoutParams.height = heightList.get(position);
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
holder.textView.setLayoutParams(layoutParams);
//Set random background color
holder.textView.setBackgroundColor(Color.rgb((int) (100+ Math.random()*155),(int) (100+ Math.random()*155),(int) (100+ Math.random( )*155)));
//Set the text
holder.textView.setText(list.get(position));
//Set the listener event
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//The execution of the listening event is triggered,,, instead of processing directly
onItemListner.onItemClick(position);
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick( View view) {
onItemListner.onItemLongClick(position);
//Resolve the conflict between click and long press
return true;
}
});
}
@Override
public int getItemCount() {
return list.size();
}
/**
* Created to set the event method
* @param onItemListner
*/
public void setOnItemListner(OnItemListner onItemListner) {
this.onItemListner = onItemListner;
}
}
Main method
package com.dash.project_1511a;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.dash.project_1511a.inter.OnItemListner;
import java.util.ArrayList;
import java.util.List;
/**
* 1.展示列表
* 2.展示gridview表格
* 3.瀑布流
*/
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private MyListAdapter myListAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recycler_view) ;
//data
final List<String> list = new ArrayList<>();
for (int i = 0;i<1000;i++){
list.add("This is entry"+i);
}
//Must be specified Layout manager
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this, OrientationHelper.HORIZONTAL,true));
//The setting is the adapter
myListAdapter = new MyListAdapter(MainActivity.this, list);
recyclerView.setAdapter(myListAdapter);
//The click event and long press event of an item need to be implemented by yourself
myListAdapter.setOnItemListner(new OnItemListner() {
@Override
public void onItemClick(int position) {
Toast.makeText(MainActivity.this,"Clicked:"+list.get(position),Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(int position) {
Toast.makeText(MainActivity.this, "Long press:"+list.get(position),Toast.LENGTH_SHORT).show();
}
});
}
/**
* Click event....listView effect is vertical by default,,, you can is horizontal
* @param view
*/
public void lieBiao(View view) {
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
}
public void biaoGe(View view) {
//recyclerView.setLayoutManager(new GridLayoutManager(MainActivity.this,3));
recyclerView.setLayoutManager(new GridLayoutManager(this,3,OrientationHelper.HORIZONTAL,false));
}
/**
* 瀑布流
* @param view
*/
public void waterWall(View view) {
//竖直的瀑布流效果
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,OrientationHelper.VERTICAL));
}
}