Android适配器终结者？

终结Adapter、ViewHolder，封装通用适配器

项目传送门

compile 'com.excellence:basetools:1.2.4'

Android适配器

在Android开发中，经常使用Adapter和ViewHolder，总是写着千篇一律的适配器代码，所以进行通用型、万能型的Adapter封装。

• MVVM模式Adapter封装
  最近学习MVVM，发现一系列优点，适配器封装也非常简单，并且可以让ViewHolder去死吧，只留下可爱的Adapter；开启DataBinding，进行封装。

• 普通Adapter封装
  其他环境下：不开启DataBinding，封装Adapter和ViewHolder，使用时需要实现Adapter的抽象接口。

以上两种方式都可以实现单布局类型、多布局类型的适配器。

Adapter示例

MVVM模式Adapter示例

DataBinding，ListVew、GridView适配器

• 单布局类型
  简单到爆炸有木有!!!

  // 直接创建CommonBindingAdapter
  CommonBindingAdapter<Flower> adapter = new CommonBindingAdapter<>(mFlowers, R.layout.item_flower, BR.flower);
  // 设置适配器，等同于ListView.setAdapter()、GridView.setAdapter()
  mBinding.setAdapter(adapter);

• 多布局类型
  主要是实现多布局类型的ViewDelegate的接口

  // 直接创建MultiItemTypeBindingAdapter
  MultiItemTypeBindingAdapter<Flower> adapter = new MultiItemTypeBindingAdapter<>(mFlowers);
  // 添加多布局类型
  adapter.addItemViewDelegate(new RoseViewDelegate());
  adapter.addItemViewDelegate(new TulipViewDelegate());
  // 设置适配器
  mBinding.setAdapter(adapter);

  实现ItemViewDelegate的接口

  public static class RoseViewDelegate implements ItemViewDelegate<Flower>
  {
  	@Override
  	public int getItemViewLayoutId()
  	{
  		return R.layout.item_rose;
  	}
  
  	@Override
  	public int getItemVariable()
  	{
  		return BR.rose;
  	}
  
  	@Override
  	public boolean isForViewType(Flower item, int position)
  	{
  		return item instanceof Rose;
  	}
  }

DataBinding，RecyclerView适配器

同上

• 单布局类型

  // 直接创建BaseRecyclerBindingAdapter
  BaseRecyclerBindingAdapter<Flower> adapter = new BaseRecyclerBindingAdapter<>(mFlowers, R.layout.item_flower, BR.flower);
  // 设置适配器，等同于RecyclerView.setAdapter()
  mBinding.setAdapter(adapter);
  // 注意设置LayoutManager，等同于RecyclerView.setLayoutManager()
  mBinding.setLayoutManager(new LinearLayoutManager(this));

• 多布局类型

  MultiItemTypeBindingRecyclerAdapter<Flower> adapter = new MultiItemTypeBindingRecyclerAdapter<>(mFlowers);
  adapter.addItemViewDelegate(new RoseViewDelegate());
  adapter.addItemViewDelegate(new TulipViewDelegate());
  mBinding.setAdapter(adapter);
  mBinding.setLayoutManager(new LinearLayoutManager(this));

普通Adapter示例

ListVew、GridView适配器

• 单布局类型
  实现CommonAdapter的接口

  // 创建adapter类继承CommonAdapter，然后设置适配器即可
  private class AppGridAdapter extends CommonAdapter<ResolveInfo>
  {
      public AppGridAdapter(Context context, List<ResolveInfo> datas, int layoutId)
      {
          super(context, datas, layoutId);
      }
  
      @Override
      public void convert(ViewHolder viewHolder, ResolveInfo item, int position)
      {
  		// ViewHolder封装了一些辅助方法，方便View的各种设置
          ImageView iconView = viewHolder.getView(android.R.id.icon);
          iconView.setImageDrawable(item.loadIcon(mPackageManager));
          viewHolder.setText(android.R.id.text1, item.loadLabel(mPackageManager).toString());
      }
  }

• 多布局类型
  实现ItemViewDelegate接口

  // 多布局适配器
  private class ChatAdapter extends MultiItemTypeAdapter<People>
  {
      public ChatAdapter(Context context, List<People> messages)
      {
          super(context, messages);
          addItemViewDelegate(new ComputerDelegate());
          addItemViewDelegate(new BlueDelegate());
          addItemViewDelegate(new PurpleDelegate());
      }
  }
  
  // 不同的布局视图
  private class ComputerDelegate implements ItemViewDelegate<People>
  {
      @Override
      public int getItemViewLayoutId()
      {
          return R.layout.item_computer;
      }
  
      @Override
      public boolean isForViewType(People item, int position)
      {
          return item instanceof ComputerData;
      }
  
      @Override
      public void convert(ViewHolder viewHolder, People item, int position)
      {
          viewHolder.setText(R.id.computer_text, item.getMsg());
      }
  }

RecyclerView适配器

• 单布局类型
  实现BaseRecyclerAdapter的接口

  // 创建adapter类继承BaseRecyclerAdapter
  private class AppRecyclerAdapter extends BaseRecyclerAdapter<ResolveInfo>
  {
      private PackageManager mPackageManager = null;
  
      public AppRecyclerAdapter(Context context, List<ResolveInfo> datas, int layoutId)
      {
          super(context, datas, layoutId);
          mPackageManager = context.getPackageManager();
      }
  
      @Override
      public void convert(RecyclerViewHolder viewHolder, ResolveInfo item, int position)
      {
  		// ViewHolder封装了一些辅助方法，方便View的各种设置
          viewHolder.setText(android.R.id.text1, item.loadLabel(mPackageManager));
          viewHolder.setImageDrawable(android.R.id.icon, item.loadIcon(mPackageManager));
      }
  
  }

• 多布局类型
  实现ItemViewDelegate的接口

  // 多布局适配器
  private class WarAdapter extends MultiItemTypeRecyclerAdapter<People>
  {
      public WarAdapter(Context context, List<People> datas)
      {
          super(context, datas);
          addItemViewDelegate(new ComputerRecyclerDelegate());
          addItemViewDelegate(new BlueRecyclerDelegate());
          addItemViewDelegate(new PurpleRecyclerDelegate());
      }
  }
  
  // 不同的布局视图
  private class ComputerRecyclerDelegate implements ItemViewDelegate<People>
  {
      @Override
      public int getItemViewLayoutId()
      {
          return R.layout.item_computer;
      }
  
      @Override
      public boolean isForViewType(People item, int position)
      {
          return item instanceof ComputerData;
      }
  
      @Override
      public void convert(RecyclerViewHolder viewHolder, People item, int position)
      {
          viewHolder.setText(R.id.computer_text, item.getMsg());
      }
  }

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