Android初學第82天

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Android初學第82天

20_MVVM

代碼BeatBoxBeatBoxFragment.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();        }    }}

Android初學第82天