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Android初学第82天

androidAndroid初学IT知识

春衣少年当酒歌，起舞四顾以笑和。这篇文章主要讲述Android初学第82天相关的知识，希望能为你提供帮助。
android初学第82天【Android初学第82天】20_MVVM
代码 BeatBox
BeatBoxFragment.java

package com.bignerdranch.android.beatbox; import android.databinding.DataBindingUtil; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.bignerdranch.android.beatbox.databinding.FragmentBeatBoxBinding; import com.bignerdranch.android.beatbox.databinding.ListItemSoundBinding; import java.util.List; public class BeatBoxFragment extends Fragment {private BeatBox mBeatBox; public static BeatBoxFragment newInstance() { return new BeatBoxFragment(); }@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { FragmentBeatBoxBinding binding = DataBindingUtil .inflate(inflater, R.layout.fragment_beat_box, container, false); binding.recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3)); binding.recyclerView.setAdapter(new SoundAdapter(mBeatBox.getSounds())); return binding.getRoot(); }@Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mBeatBox = new BeatBox(getActivity()); }private class SoundHolder extends RecyclerView.ViewHolder { private ListItemSoundBinding mBinding; private SoundHolder(ListItemSoundBinding binding) { super(binding.getRoot()); mBinding = binding; mBinding.setViewModel(new SoundViewModel(mBeatBox)); }public void bind(Sound sound) { mBinding.getViewModel().setSound(sound); mBinding.executePendingBindings(); } }private class SoundAdapter extends RecyclerView.Adapter< SoundHolder> { private List< Sound> mSounds; public SoundAdapter(List< Sound> sounds) { mSounds = sounds; }@Override public SoundHolder onCreateViewHolder(ViewGroup parent, int viewType) { LayoutInflater inflater = LayoutInflater.from(getActivity()); ListItemSoundBinding binding = DataBindingUtil .inflate(inflater, R.layout.list_item_sound, parent, false); return new SoundHolder(binding); }@Override public void onBindViewHolder(SoundHolder holder, int position) { Sound sound = mSounds.get(position); holder.bind(sound); }@Override public int getItemCount() { return mSounds.size(); } } }


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