Android GridView 实现横向列表水平滚动

转载自第一代码的原创文章http://www.diyidaima.com/article/detail/F6VDTnie

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;
}

}