安卓高級3 RecyclerView 和cardView使用案例

上訴案例:用改用gridlayout

//沒行4個
GridLayoutManager(this, 4, LinearLayoutManager.HORIZONTAL, false);
        recyclerView.setLayoutManager(gridLayoutManager);

效果圖:

另一個方向參考上一個Linear案例

適配器

package qianfeng.com.day38_recyclerview;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

/**
 * Created by ${Mr.Zhao} on 2016/10/19.
 */
public class MyRecyclerAdapter extends RecyclerView.Adapter {


    List list;
    Context context;
    LayoutInflater inflater;
    RecyclerView recyclerView;

    private OnItemClickListener listener;

    public interface OnItemClickListener {
        public void onItemClickListener(int position);

        public void onItemLongClickListener(int position);

    }


    public MyRecyclerAdapter(List list, Context context, RecyclerView recyclerView, OnItemClickListener listener) {
        this.list = list;
        this.context = context;
        this.recyclerView = recyclerView;
        inflater = LayoutInflater.from(context);
        this.listener = listener;
    }

    // 該方法為 創建ViewHolder 使用
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //  實例化  itemView
        View view = inflater.inflate(R.layout.item_layout, parent, false);
        return new MyViewHolder(view);
    }

    //  該方法為  綁定數據使用
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.item_tv.setText(list.get(position));
    }

    // 返回數據長度
    @Override
    public int getItemCount() {
        return list.size();
    }

    // 定義  ViewHolder
    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView item_tv;

        // 必須實現的有參構造
        public MyViewHolder(final View itemView) {
            super(itemView);
            //   實例化 textView
            item_tv = ((TextView) itemView.findViewById(R.id.item_tv));

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //   獲取itemView 的 位置
                    int childPosition = recyclerView.getChildAdapterPosition(itemView);
                    // 監聽方法
                    listener.onItemClickListener(childPosition);
                }
            });

            itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    int childAdapterPosition = recyclerView.getChildAdapterPosition(itemView);
                    listener.onItemLongClickListener(childAdapterPosition);
                    return true;
                }
            });
        }
    }
}

package qianfeng.com.day38_recyclerview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 *   ListView 模式 下的  下劃線
 * Created by ${Mr.Zhao} on 2016/5/26.
 *
 *  可以自由更改分割線   android.R.attr.listDivider
 *  去  values  的 styles   下 添加 android：listDivider  屬性  在面的值 可以任意修改
 *  圖片或者顏色 或者 Drawable 資源
 */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {

        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }

    }


    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            RecyclerView v = new RecyclerView(parent.getContext());
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }

}