Android GridView 实现横向列表水平滚动

有时候根据项目需要，使用可横向滑动的GridView。仅以该文记录一下，毕竟没什么技术含量。
1.主界面布局代码：activity_main.xml。设置android:numColumns=”auto_fit”是因为可以不定项的添加子项。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <HorizontalScrollView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="fill_parent">

            <view.gridviewdemo.AblGridView
                android:id="@+id/id_gridview_home"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:gravity="center"
                android:numColumns="auto_fit"
                android:scrollbars="none"
                android:stretchMode="spacingWidthUniform"/>
        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

2.主界面GridView列表子项布局文件：home_gridview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="0dp"
    android:background="#ffffff"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/id_iv_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:gravity="center" />

    <TextView
        android:id="@+id/id_tv_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="5dp"
        android:gravity="center"
        android:paddingBottom="10dp"
        android:text="标题文字"
        android:textSize="12sp" />
</LinearLayout>

3.java实现代码：MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.widget.GridView;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {
    AblGridView id_gridview_home;
    private int[] imgs = {R.mipmap.index1_nav_xc, R.mipmap.index1_nav_xc,
            R.mipmap.index1_nav_xc, R.mipmap.index1_nav_xc, R.mipmap.index1_nav_xc};
    private String[] titles = new String[]{"子项1", "子项2","子项3","子项4", "子项5"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        id_gridview_home= (AblGridView) findViewById(R.id.id_gridview_home);
        setGridView();
    }

    /**设置GirdView参数，绑定数据*/
    private void setGridView() {
        int size = imgs.length;
        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);
        id_gridview_home.setLayoutParams(params); // 设置GirdView布局参数,横向布局的关键
        id_gridview_home.setColumnWidth(itemWidth); // 设置列表项宽
        id_gridview_home.setHorizontalSpacing(5); // 设置列表项水平间距
        id_gridview_home.setStretchMode(GridView.NO_STRETCH);
        id_gridview_home.setNumColumns(size); // 设置列数量=列表集合数
        AblGridViewBaseAdapter adapter = new AblGridViewBaseAdapter(this,imgs,titles);
        id_gridview_home.setAdapter(adapter);
    }
}

4.自定义控件：AblGridView

import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;

/**
 * 继承GridView控件，为了更友好的显示
 * 解决在scrollview中只显示第一行数据的问题
 */
public class AblGridView extends GridView {
    public AblGridView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public AblGridView(Context context) {
        super(context);
    }

    public AblGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }

}

5.重写适配器：AblGridViewBaseAdapter

import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * 重写适配器
 */
public class AblGridViewBaseAdapter extends BaseAdapter {

    private Context mContext;
    private String[] Title;//显示标题数组
    private int[] Imgs;//显示图标数组

    public AblGridViewBaseAdapter(Context mContext,int[] imgs ,String[] titles) {
        super();
        this.mContext = mContext;
        Title = titles;
        Imgs = imgs;
    }

    @Override
    public int getCount() {
        return Title.length;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = loadHomeHyOrYs(position, convertView, parent);
        return convertView;
    }

    /**
     * 加载会员或医生的功能列表
     */
    public View loadHomeHyOrYs(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(
                    R.layout.home_gridview_item, parent, false);
        }
        TextView tv = get(convertView, R.id.id_tv_item);
        ImageView iv = get(convertView, R.id.id_iv_item);
        iv.setBackgroundResource(Imgs[position]);
        tv.setText(Title[position]);
        return convertView;
    }

    public <T extends View> T get(View view, int id) {
        SparseArray<View> viewHolder = (SparseArray<View>) view.getTag();
        if (viewHolder == null) {
            viewHolder = new SparseArray<View>();
            view.setTag(viewHolder);
        }
        View childView = viewHolder.get(id);
        if (childView == null) {
            childView = view.findViewById(id);
            viewHolder.put(id, childView);
        }
        return (T) childView;
    }

}

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