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GridLayoutManagerActivity.java
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GridLayoutManagerActivity.java
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package com.example.androidsummary.android.widget.recyclerview;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.androidsummary.R;
import com.example.androidsummary.base.BaseTitleActivity;
import java.util.ArrayList;
import java.util.List;
public class GridLayoutManagerActivity extends BaseTitleActivity implements View.OnClickListener {
private RecyclerView rv_list;
private Button btn_have_data;
private Button btn_no_data;
private List<String> data = new ArrayList<>();
private GridLayoutAdapter adapter;
private static final int SPAN_COUNT = 2;
public static void actionStart(Context context) {
Intent intent = new Intent(context, GridLayoutManagerActivity.class);
context.startActivity(intent);
}
@Override
protected int getLayoutId() {
return R.layout.activity_grid_layout_manager;
}
@Override
protected void initView() {
super.initView();
rv_list = findViewById(R.id.rv_list);
btn_have_data = findViewById(R.id.btn_have_data);
btn_no_data = findViewById(R.id.btn_no_data);
//设置layoutManager
GridLayoutManager manager = new GridLayoutManager(mContext, SPAN_COUNT, RecyclerView.VERTICAL, false);
rv_list.setLayoutManager(manager);
//设置空白数据时,空白布局占据的spanCount
manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
int viewType = rv_list.getAdapter().getItemViewType(position);
if(viewType == -1) {
return SPAN_COUNT;
}
return 1;
}
});
//设置适配器
adapter = new GridLayoutAdapter();
rv_list.setAdapter(adapter);
}
@Override
protected void initListener() {
super.initListener();
btn_have_data.setOnClickListener(this);
btn_no_data.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_have_data :
setData();
break;
case R.id.btn_no_data :
clearData();
break;
}
}
private void clearData() {
data.clear();
adapter.notifyDataSetChanged();
}
private void setData() {
for(int i = 0; i < 30; i++) {
data.add("index"+(i+1));
}
adapter.setData(data);
}
}