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Recyclerview的使用

Recyclerview的使用

作者: lllllliudahong | 来源:发表于2018-09-19 16:22 被阅读0次

    recyclerview是Google Android 5.0推出的新控件,所以导入support-v7包要是5.0以上的

    implementation 'com.android.support:appcompat-v7:26.1.0'
    

    或者直接导入

    compile 'com.android.support:recyclerview-v7:21.0.0'
    

    还有一种方式就是导入recyclerview-v7-21.0.0.jar
    进入Android SDK的路径
    D:\Users\Users\AppData\Local\Android\sdk\extras\android\m2repository\com\android\support\recyclerview-v7\21.0.0
    找到recyclerview-v7-21.0.0.aar, 复制一份,然后修改后缀为recyclerview-v7-21.0.0 - 副本.aar.rar ,然后解压该.rar压缩包,找到其中的classes.jar 文件名为:recyclerview-v7-21.0.0.jar

    然后就可以开始使用Recyclerview了:
    activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent"
        tools:context="android.my.com.myrecyclerview.MainActivity">
    
        <android.support.v7.widget.RecyclerView
            android:id="@+id/my_recyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    
    </android.support.constraint.ConstraintLayout>
    

    新建Adapter
    RecyclerViewAdapter.java

    public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
    
        private Context context;
        private ArrayList<String> datas;
    
        class ViewHolder extends RecyclerView.ViewHolder {
            ImageView ivIcon;
            TextView tvTitle;
    
            public ViewHolder(View itemView) {
                super(itemView);
                tvTitle = (TextView) itemView.findViewById(R.id.id_num);
            }
        }
    
        public RecyclerViewAdapter(Context context, ArrayList<String> datas) {
            this.context = context;
            this.datas = datas;
        }
    
        /**
         * 相当于getView方法中View和ViewHolder
         * @param viewGroup
         * @param i
         * @return
         */
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            View itemView = View.inflate(context, R.layout.item_home, null);
            RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            itemView.setLayoutParams(lp);
            return new ViewHolder(itemView);
        }
    
        @Override
        public void onBindViewHolder(ViewHolder viewHolder, int i) {
        //根据position得到对应的数据
            String data = datas.get(i);
            viewHolder.tvTitle.setText(data);
        }
    
        /**
         * 总条数
         * @return
         */
        @Override
        public int getItemCount() {
            return datas.size();
        }
    }
    

    item_home布局
    ····

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="android.my.com.myrecyclerview.MainActivity"
    android:background="#ffffff"
    android:orientation="vertical">
    
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <ImageView
            android:id="@+id/id_image"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:background="@drawable/ic_launcher_background"/>
        <TextView
            android:id="@+id/id_num"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_marginLeft="10dp"
            android:gravity="center_vertical"
            android:layout_toRightOf="@id/id_image"
            android:text="1" />
    </RelativeLayout>
    
    <TextView
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/colorPrimaryDark"
        android:visibility="gone"
        />
    </LinearLayout>
    

    MainActivity使用代码

    mRecyclerView = (RecyclerView) findViewById(R.id.my_recyclerview);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
    initData();
    mRecyclerView.setAdapter(new RecyclerViewAdapter(this,titles));
    

    这里需要提一下怎么添加分割线,方法addItemDecoration();

    mRecyclerView.addItemDecoration(new SimplePaddingDecoration(this));
    

    SimplePaddingDecoration代码:

    public class SimplePaddingDecoration extends RecyclerView.ItemDecoration{
    private int dividerHeight;
        private Paint dividerPaint;
    
        public SimplePaddingDecoration(Context context) {
            dividerPaint = new Paint();
            dividerPaint.setColor(context.getResources().getColor(R.color.colorPrimaryDark));
            dividerHeight = context.getResources().getDimensionPixelSize(R.dimen.divider_height);
        }
    
    
        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
            super.getItemOffsets(outRect, view, parent, state);
            outRect.bottom = dividerHeight;
        }
    
        @Override
        public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
            int childCount = parent.getChildCount();
            int left = parent.getPaddingLeft();
            int right = parent.getWidth() - parent.getPaddingRight();
    
            for (int i = 0; i < childCount - 1; i++) {
                View view = parent.getChildAt(i);
                float top = view.getBottom();
                float bottom = view.getBottom() + dividerHeight;
                c.drawRect(left, top, right, bottom, dividerPaint);
            }
        }
    }
    
    最终效果图 myrecyclerview.png

    代码下载路径:https://github.com/lllllliudahong/MyRecyclerView

    最近发现了BRVAH框架,推荐一下
    https://github.com/CymChad/BaseRecyclerViewAdapterHelper

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