Android RecyclerView加載不同布局簡單實現

前言

關於RecyclerView的使用這裡就不在贅述了,相信網上一搜一大把(本人之前的文章也有簡單的使用介紹),這次我們講的是RecyclerView在使用的過程中,有時候會根據不同的位置加載不同的布局的簡單實現,這裡只是起到拋磚引玉的作用

效果圖

設計思想
 •重寫RecyclerView.Adapter的getItemViewType(int position),
在此方法中根據不同的position，設置不同的ViewType
 •編寫具體的RecyclerView.ViewHolder子類(不同子類對應不同View或Layout)
 •重寫RecyclerView.Adapter的onCreateViewHolder(ViewGroup parent,int viewType)
在此方法中根據我們之前設置的ViewType來返回不同的RecyclerView.ViewHolder的子類 

代碼

使用RecyclerView需要添加依賴

compile 'com.android.support:recyclerview-v7:24.1.1'

首先是MainActivity布局,很簡單的布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  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="com.example.hfs.recyclerviewloadlayout.MainActivity">

  <android.support.v7.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</RelativeLayout>

然後是MainActivity代碼

package com.example.hfs.recyclerviewloadlayout;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

  private RecyclerView mRecyclerView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    initView();

    initData();
  }

  private void initData() {
    List<String> descs = new ArrayList<>();
    descs.clear();

    List<Integer> images = new ArrayList<>();
    images.clear();

    for (int i = 1; i < 21; i++) {
      descs.add("測試數據" + (i < 10 ? "0" + i : i));
    }

    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);
    images.add(R.mipmap.ic_launcher);

    MyAdapter adapter = new MyAdapter(MainActivity.this, descs, images);
    mRecyclerView.setAdapter(adapter);
    RecyclerView.LayoutManager manager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
    mRecyclerView.setLayoutManager(manager);
    mRecyclerView.addItemDecoration(new DividerItemDecoration(MainActivity.this, DividerItemDecoration.VERTICAL_LIST));

    adapter.setmOnItemClickListener(new MyAdapter.OnItemClickListener() {
      @Override
      public void onItemClick(View view, int position) {
        Toast.makeText(MainActivity.this, "點擊了" + position + "位置", Toast.LENGTH_SHORT).show();
      }
    });
  }

  private void initView() {
    mRecyclerView= (RecyclerView) findViewById(R.id.recyclerview);
  }
}

然後是我們的適配器

package com.example.hfs.recyclerviewloadlayout;

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

import java.util.ArrayList;
import java.util.List;

/**
 * Created by HFS on 2016/8/24.
 */
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

  private Context mContext;
  private List<String> descs;
  private List<Integer> images;
  private List<Object> allList;

  private static final int TEXTVIEW_VIEWTYPE = 1;
  private static final int IMAGEVIEW_VIEWTYPE = 2;

  public interface OnItemClickListener {
    void onItemClick(View view, int position);
  }

  private OnItemClickListener mOnItemClickListener;

  public OnItemClickListener getmOnItemClickListener() {
    return mOnItemClickListener;
  }

  public void setmOnItemClickListener(OnItemClickListener mOnItemClickListener) {
    this.mOnItemClickListener = mOnItemClickListener;
  }

  public MyAdapter(Context mContext, List<String> descs, List<Integer> images) {
    this.mContext = mContext;
    this.descs = descs;
    this.images = images;

    allList = new ArrayList<>();
    allList.clear();
    for (int i = 0; i < descs.size(); i++) {
      allList.add(descs.get(i));
      allList.add(images.get(i));
    }
  }

  @Override
  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder holder = getViewHolderByViewType(viewType);
    return holder;
  }

  private RecyclerView.ViewHolder getViewHolderByViewType(int viewType) {

    View tv_ItemView = View.inflate(mContext, R.layout.item_tv, null);
    View iv_ItemView = View.inflate(mContext, R.layout.item_iv, null);

    RecyclerView.ViewHolder holder = null;
    switch (viewType) {
      case TEXTVIEW_VIEWTYPE:
        holder = new MyTextView_ViewHolder(tv_ItemView);
        break;
      case IMAGEVIEW_VIEWTYPE:
        holder = new MyImageView_ViewHolder(iv_ItemView);
        break;
    }
    return holder;
  }

  @Override
  public int getItemViewType(int position) {
    int viewType = -1;
    int index = position % 2;
    switch (index) {
      case 0:
        viewType = TEXTVIEW_VIEWTYPE;
        break;
      case 1:
        viewType = IMAGEVIEW_VIEWTYPE;
        break;
    }
    return viewType;
  }

  @Override
  public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
    if (position % 2 == 0) {
      ((MyTextView_ViewHolder) holder).tv.setText(((String) allList.get(position)));
      ((MyTextView_ViewHolder) holder).view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          if (mOnItemClickListener != null) {
            mOnItemClickListener.onItemClick(v, position);
          }
        }
      });

    } else {
      ((MyImageView_ViewHolder) holder).iv.setImageResource(((Integer) allList.get(position)));
      ((MyImageView_ViewHolder) holder).view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          if (mOnItemClickListener != null) {
            mOnItemClickListener.onItemClick(v, position);
          }
        }
      });
    }
  }

  @Override
  public int getItemCount() {
    return allList.size();
  }

  class MyTextView_ViewHolder extends RecyclerView.ViewHolder {
    public View view;
    public TextView tv;

    public MyTextView_ViewHolder(View itemView) {
      super(itemView);
      this.view = itemView;
      this.tv = (TextView) itemView.findViewById(R.id.tv);
    }
  }

  class MyImageView_ViewHolder extends RecyclerView.ViewHolder {

    public View view;
    public ImageView iv;

    public MyImageView_ViewHolder(View itemView) {
      super(itemView);
      this.view = itemView;
      this.iv = (ImageView) itemView.findViewById(R.id.iv);
    }
  }
}

接著就是我們自定義的DividerItemDecoration

package com.example.hfs.recyclerviewloadlayout;

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;

/**
 * Created by HFS on 2016/8/24.
 */
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);
    }
  }
}

項目地址:https://github.com/Greathfs/RecyclerViewLoadLayout

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持本站。