Android开发如何实现横向列表GridView横向滚动
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具体如下:
Android 横向列表实现,可左右滑动,如下图
1. 主界面布局代码:activity_main.xml
a.包裹HorizontalScrollView控件是GirdView横向滚动的基本条件
b.GirdView外包裹LinearLayout是java代码中参数设置的必要条件
2.主界面GridView列表子项布局文件:list_item.xml
3.java实现代码:MainActivity.java
package com.example.horizontallistview; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.TextView; /*** * * @author ymw */ public class MainActivity extends Activity { ListcityList; RelativeLayout itmel; GridView gridView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LayoutInflater layoutInflater = (LayoutInflater) this .getSystemService("layout_inflater"); gridView = (GridView) findViewById(R.id.grid); setData(); setGridView(); } /**设置数据*/ private void setData() { cityList = new ArrayList (); CityItem item = new CityItem(); item.setCityName("深圳"); item.setCityCode("0755"); cityList.add(item); item = new CityItem(); item.setCityName("上海"); item.setCityCode("021"); cityList.add(item); item = new CityItem(); item.setCityName("广州"); item.setCityCode("020"); cityList.add(item); item = new CityItem(); item.setCityName("北京"); item.setCityCode("010"); cityList.add(item); item = new CityItem(); item.setCityName("武汉"); item.setCityCode("027"); cityList.add(item); item = new CityItem(); item.setCityName("孝感"); item.setCityCode("0712"); cityList.add(item); cityList.addAll(cityList); } /**设置GirdView参数,绑定数据*/ private void setGridView() { int size = cityList.size(); int length = 100; DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); float density = dm.density; int gridviewWidth = (int) (size * (length + 4) * density); int itemWidth = (int) (length * density); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( gridviewWidth, LinearLayout.LayoutParams.FILL_PARENT); gridView.setLayoutParams(params); // 设置GirdView布局参数,横向布局的关键 gridView.setColumnWidth(itemWidth); // 设置列表项宽 gridView.setHorizontalSpacing(5); // 设置列表项水平间距 gridView.setStretchMode(GridView.NO_STRETCH); gridView.setNumColumns(size); // 设置列数量=列表集合数 GridViewAdapter adapter = new GridViewAdapter(getApplicationContext(), cityList); gridView.setAdapter(adapter); } /**GirdView 数据适配器*/ public class GridViewAdapter extends BaseAdapter { Context context; List list; public GridViewAdapter(Context _context, List _list) { this.list = _list; this.context = _context; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater layoutInflater = LayoutInflater.from(context); convertView = layoutInflater.inflate(R.layout.list_item, null); TextView tvCity = (TextView) convertView.findViewById(R.id.tvCity); TextView tvCode = (TextView) convertView.findViewById(R.id.tvCode); CityItem city = list.get(position); tvCity.setText(city.getCityName()); tvCode.setText(city.getCityCode()); return convertView; } } public class CityItem { private String cityName; private String cityCode; public String getCityName() { return cityName; } public void setCityName(String cityName) { this.cityName = cityName; } public String getCityCode() { return cityCode; } public void setCityCode(String cityCode) { this.cityCode = cityCode; } } }
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