GridView實現桌面圖標顯示案例

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;
    }
}

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;
    }
}

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gridview_layout);
        //視圖層View
        GridView gridView = findViewById(R.id.gridView);
        //數據源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,"電話"));
        list.add(new Icon(R.mipmap.icon4,"照片"));
        list.add(new Icon(R.mipmap.icon5,"音樂"));
        list.add(new Icon(R.mipmap.icon6,"Chrome"));
        list.add(new Icon(R.mipmap.icon7,"百度"));
        //控制層Controller
        GridViewAdapter adapter = new GridViewAdapter(list,this);
        gridView.setAdapter(adapter);
        //綁定點擊事件
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(), "你點擊瞭第" + (position+1) + "項", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

<?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>

<?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>