android RecycleView實現瀑布流
阿新 • • 發佈:2019-02-07
介面卡器
package com.shilian.ceshi.recycle;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.shilian.ceshi.R;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
/**
*
* Created by Administrator on 2017/4/25.
*/
public class MyRecycleAdapter extends RecyclerView.Adapter<MyRecycleAdapter.MyViewHolder> {
private Context context;
private List<String> res_list;
private LayoutInflater inflater;
private List<Integer> height_list;
private OnClickListener on_click;
public MyRecycleAdapter(Context context, List<String> res_list) {
this.context = context;
inflater = LayoutInflater.from(context);
this.res_list = res_list;
height_list=new ArrayList<>();
for (int i=0;i<res_list.size();i++){
height_list.add(100+(int)(Math.random()*300));
}
}
interface OnClickListener{
void onItemClick(View itemView,int position);
}
@Override
public MyRecycleAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.layout_recycle_test_item, parent,false);
MyViewHolder mvh=new MyViewHolder(view);
return mvh;
}
@Override
public void onBindViewHolder(final MyRecycleAdapter.MyViewHolder holder, int position) {
holder.tv.setText(res_list.get(position));
ViewGroup.LayoutParams lp=holder.itemView.getLayoutParams();
lp.height=height_list.get(position);
holder.itemView.setLayoutParams(lp);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (on_click!=null){
on_click.onItemClick(v,holder.getLayoutPosition());
}
}
});
}
@Override
public int getItemCount() {
return res_list.size();
}
public void setOnClickListener(OnClickListener onClickListener){
on_click=onClickListener;
}
public void addItem(){
res_list.add(1,"insert one");
height_list.add(1,100+(int)(Math.random()*300));
notifyItemInserted(1);
}
public void removeItem(){
res_list.remove(1);
height_list.remove(1);
notifyItemRemoved(1);
}
class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.textView_item)
TextView tv;
public MyViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
測試activity
package com.shilian.ceshi.recycle;import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Toast;
import com.shilian.ceshi.R;
import java.util.ArrayList;
import java.util.List;
import javax.xml.transform.Result;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
public class RecycleTestActivity extends Activity {
@BindView(R.id.recyclerView)
RecyclerView recyclerView;
private List<String> res_list;
private MyRecycleAdapter mra;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycle_test);
ButterKnife.bind(this);
res_list=new ArrayList<>();
for (int i='A';i<'z';i++){
res_list.add(""+(char)i);
}
mra=new MyRecycleAdapter(this,res_list);
recyclerView.setAdapter(mra);
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));
recyclerView.setItemAnimator(new DefaultItemAnimator());
mra.setOnClickListener(new MyRecycleAdapter.OnClickListener() {
@Override
public void onItemClick(View itemView, int position) {
Toast.makeText(RecycleTestActivity.this,"onClick:"+position,Toast.LENGTH_SHORT).show();
}
});
}
@OnClick({R.id.textView_listview, R.id.textView_gridview, R.id.textView_listview_h, R.id.textView_gridview_h, R.id.textView_stargleview})
public void onClick(View view) {
switch (view.getId()) {
case R.id.textView_listview:
mra.addItem();
break;
case R.id.textView_gridview:
mra.removeItem();
break;
case R.id.textView_listview_h:
recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
break;
case R.id.textView_gridview_h:
recyclerView.setLayoutManager(new GridLayoutManager(this,3));
break;
}
}
}
recycleView實現瀑布流的關鍵是設定layoutManager為StaggeredGridLayoutManager
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));