今天小编给大家分享一下怎么使用GridView实现桌面图标显示的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
用法与ListView类似,需要以下几步:
1、定义实体类
2、自定义适配器继承BaseAdapter
3、定义GridView内部布局
代码:
实体类:Icon.java
package com.example.a16gridviewtest.entity; public class Icon { private int iconId; private String name; public Icon(int iconId, String name) { this.iconId = iconId; this.name = name; } public int getIconId() { return iconId; } public void setIconId(int iconId) { this.iconId = iconId; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
自定义适配器:GridViewAdapter.java
package com.example.a16gridviewtest.adpater; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.a16gridviewtest.R; import com.example.a16gridviewtest.entity.Icon; import java.util.List; public class GridViewAdapter extends BaseAdapter { private List<Icon> mData; private Context mContext; public GridViewAdapter(List<Icon> data, Context context) { this.mData = data; this.mContext = context; } @Override public int getCount() { return mData != null ? mData.size() : 0; } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = LayoutInflater.from(mContext).inflate(R.layout.item_grid_icon, parent, false); holder.img_icon = convertView.findViewById(R.id.img_icon); holder.name = convertView.findViewById(R.id.txt_icon); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.img_icon.setImageResource(mData.get(position).getIconId()); holder.name.setText(mData.get(position).getName()); return convertView; } class ViewHolder { private ImageView img_icon; private TextView name; } }
MainAcitivity.java
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gridview_layout); //视图层View GridView gridView = findViewById(R.id.gridView); //数据源Model ArrayList<Icon> list = new ArrayList<>(); list.add(new Icon(R.mipmap.icon1,"QQ")); list.add(new Icon(R.mipmap.icon2,"微信")); list.add(new Icon(R.mipmap.icon3,"电话")); list.add(new Icon(R.mipmap.icon4,"照片")); list.add(new Icon(R.mipmap.icon5,"音乐")); list.add(new Icon(R.mipmap.icon6,"Chrome")); list.add(new Icon(R.mipmap.icon7,"百度")); //控制层Controller GridViewAdapter adapter = new GridViewAdapter(list,this); gridView.setAdapter(adapter); //绑定点击事件 gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(getApplicationContext(), "你点击了第" + (position+1) + "项", Toast.LENGTH_SHORT).show(); } }); } }
主布局文件:activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridView" android:layout_width="match_parent" android:layout_height="match_parent" android:horizontalSpacing="10dp" android:verticalSpacing="10dp" android:numColumns="3" > </GridView>
单个GridView布局:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="5dp"> <ImageView android:id="@+id/img_icon" android:layout_width="64dp" android:layout_height="64dp" android:layout_centerInParent="true" android:src="@mipmap/icon1" /> <TextView android:id="@+id/txt_icon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/img_icon" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:text="QQ" android:textSize="18sp" /> </RelativeLayout> id/img_icon" android:layout_centerHorizontal="true" android:layout_marginTop="30dp" android:text="QQ" android:textSize="18sp" /> </RelativeLayout>
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