如何在android中定义Horizo​​ntal recycleview中的项目数？

Question

以下是我构建循环视图的方法

    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

    ItemData itemsData[] = { new ItemData("Help",R.drawable.profile_pic),
            new ItemData("Delete",R.drawable.profile_pic),
            new ItemData("Cloud",R.drawable.profile_pic),
            new ItemData("Favorite",R.drawable.profile_pic),
            new ItemData("Like",R.drawable.profile_pic),
            new ItemData("Rating",R.drawable.profile_pic)};


    LinearLayoutManager l = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
    recyclerView.setLayoutManager(l);

    MyAdapter mAdapter = new MyAdapter(itemsData);

    recyclerView.setAdapter(mAdapter);

    recyclerView.setItemAnimator(new DefaultItemAnimator());

它有效，但问题是它每次只显示1项，如何更改为2项？这意味着，图标应为屏幕宽度的50％，每页总共有2个图标

喜欢这个（不需要分隔符）：

icon1 | icon2 

XML（主要活动）

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    tools:context="com.hmkcode.android.recyclerview.MainActivity" >

    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity"
        />
</RelativeLayout>

XML（项目）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="80dp">

    <!-- icon -->
    <ImageView
        android:id="@+id/item_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/profile_pic" />

    <!-- title -->
    <TextView
        android:id="@+id/item_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textColor="#000000"
        android:textSize="22sp" />

</RelativeLayout>

感谢您的帮助

更新：

注意该应用只有potarit方向，所以可以忽略横向

的情况

目前的结果：

我希望实现类似的目标

并且GridLayoutManager不是确切的行为

 GridLayoutManager g = new GridLayoutManager(this, 2, GridLayoutManager.HORIZONTAL, false);

Answer 1

你应该扩展LinearLayoutManager并覆盖下面的tow方法：

/**
     * Measure a child view using standard measurement policy, taking the padding
     * of the parent RecyclerView and any added item decorations into account.
     *
     * <p>If the RecyclerView can be scrolled in either dimension the caller may
     * pass 0 as the widthUsed or heightUsed parameters as they will be irrelevant.</p>
     *
     * @param child Child view to measure
     * @param widthUsed Width in pixels currently consumed by other views, if relevant
     * @param heightUsed Height in pixels currently consumed by other views, if relevant
     */
public void measureChild(View child, int widthUsed, int heightUsed) {
    RecyclerView.LayoutParams lpTmp = (RecyclerView.LayoutParams) child.getLayoutParams();
    final RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(screenWidth/2,lpTmp.height);
    int widthSpec = View.MeasureSpec.makeMeasureSpec(MainActivity.screenWidth /2 , View.MeasureSpec.EXACTLY);
    int heightSpec = View.MeasureSpec.makeMeasureSpec(lp.height , View.MeasureSpec.EXACTLY);
    child.measure(widthSpec, heightSpec);
}

/**
 * Measure a child view using standard measurement policy, taking the padding
 * of the parent RecyclerView, any added item decorations and the child margins
 * into account.
 *
 * <p>If the RecyclerView can be scrolled in either dimension the caller may
 * pass 0 as the widthUsed or heightUsed parameters as they will be irrelevant.</p>
 *
 * @param child Child view to measure
 * @param widthUsed Width in pixels currently consumed by other views, if relevant
 * @param heightUsed Height in pixels currently consumed by other views, if relevant
 */
public void measureChildWithMargins(View child, int widthUsed, int heightUsed) {
    super.measureChildWithMargins(child,widthUsed,heightUsed);
    RecyclerView.LayoutParams lpTmp = (RecyclerView.LayoutParams) child.getLayoutParams();
    final RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(screenWidth/2,lpTmp.height);
    int widthSpec = View.MeasureSpec.makeMeasureSpec(MainActivity.screenWidth / 2, View.MeasureSpec.EXACTLY);
    int heightSpec = View.MeasureSpec.makeMeasureSpec(lp.height, View.MeasureSpec.EXACTLY);
    child.measure(widthSpec, heightSpec);
}

上面的代码非常简单，只是一个演示，数字 2 。您可以根据需要自定义代码。希望这些对你有帮助;

Answer 2

使用此类而不是LinearLayoutManager。

import android.content.Context;
import android.graphics.Point;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;

/**
 * Created by Islam Salah.
 * <p>
 * https://github.com/IslamSalah
 * islamsalah007@gmail.com
 */

public class CustomLinearLayoutManager extends LinearLayoutManager {

private Context mContext;
private int spanCount;

public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
    super(context, orientation, reverseLayout);
    this.mContext = context;
}

@Override
public void measureChild(View child, int widthUsed, int heightUsed) {
    RecyclerView.LayoutParams lpTmp = (RecyclerView.LayoutParams) child.getLayoutParams();
    final RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(measureScreenWidth(mContext) / spanCount, lpTmp.height);
    int widthSpec = View.MeasureSpec.makeMeasureSpec(measureScreenWidth(mContext) / spanCount, View.MeasureSpec.EXACTLY);
    int heightSpec = View.MeasureSpec.makeMeasureSpec(lp.height, View.MeasureSpec.EXACTLY);
    child.measure(widthSpec, heightSpec);
}

@Override
public void measureChildWithMargins(View child, int widthUsed, int heightUsed) {
    RecyclerView.LayoutParams lpTmp = (RecyclerView.LayoutParams) child.getLayoutParams();
    final RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(measureScreenWidth(mContext) / spanCount, lpTmp.height);
    int widthSpec = View.MeasureSpec.makeMeasureSpec(measureScreenWidth(mContext) / spanCount, View.MeasureSpec.EXACTLY);
    int heightSpec = View.MeasureSpec.makeMeasureSpec(lp.height, View.MeasureSpec.EXACTLY);
    child.measure(widthSpec, heightSpec);
}

private int measureScreenWidth(Context context) {
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = windowManager.getDefaultDisplay();
    Point point = new Point();
    display.getSize(point);

    return point.x;
}

public int getSpanCount() {
    return spanCount;
}

public void setSpanCount(int spanCount) {
    this.spanCount = spanCount;
}