安卓第二次实验提交--安卓应用UI设计

实验目标和实验内容：

1、掌握UI设计中的layout布局（约束布局）与基本控件（button、text、imageview等）； 2、掌握复杂控件与adapter的使用

实验结果：（实验小结与结果截图） 3、功能说明与核心代码 我将利用RecyclerView实现在一个fragment上列出多个国内乐队名字。 BandFragment.java文件 import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import androidx.fragment.app.Fragment; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import java.util.ArrayList; import java.util.List;

public class BandFragment extends Fragment { private List mList = new ArrayList<>(); private Context context; private RecyclerView recyclerView; private com.example.mywechat.Adapter Adapter;

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";

// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;

public BandFragment() {
    // Required empty public constructor
}


// TODO: Rename and change types and number of parameters
public static BandFragment newInstance(String param1, String param2) {
    BandFragment fragment = new BandFragment();
    Bundle args = new Bundle();
    args.putString(ARG_PARAM1, param1);
    args.putString(ARG_PARAM2, param2);
    fragment.setArguments(args);
    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
        mParam1 = getArguments().getString(ARG_PARAM1);
        mParam2 = getArguments().getString(ARG_PARAM2);
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment

    View view = inflater.inflate(R.layout.tab03, container, false);
    context = view.getContext();
    recyclerView = view.findViewById(R.id.tab03_RecyclerView);
    initData();
    LinearLayoutManager manager = new LinearLayoutManager(context);
    manager.setOrientation(LinearLayoutManager.VERTICAL);

    Adapter = new Adapter(mList,context);

    recyclerView.setAdapter(Adapter);
    recyclerView.setLayoutManager(manager);

    return view;
}

private void initData() {
    mList.add("新裤子");
    mList.add("岛屿心情");
    mList.add("万能青年旅店");
    mList.add("甜约翰");
    mList.add("痛仰乐队");
    mList.add("椅子乐队");
    mList.add("隔壁团乐队");
    mList.add("理想后花园");
    mList.add("霓虹花园");
    mList.add("贰伍吸烟所");
    mList.add("草东没有派对");
    mList.add("回春丹");
    mList.add("告五人");
    mList.add("逃跑计划");
    mList.add("虎啸春");
    mList.add("落日飞车");
}

} Tab03.xml文件里的声明 <androidx.recyclerview.widget.RecyclerView android:id="@+id/tab03_RecyclerView" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> Adapter.java源码 public class Adapter extends RecyclerView.Adapter<Adapter.VerticalViewHolder> { private Context mContext; private List mList; public Adapter(List list, Context context) { mList = list; mContext = context; } @NonNull @Override public Adapter.VerticalViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(this.mContext).inflate(R.layout.item02, parent, false); return new VerticalViewHolder(view); }

@Override
public void onBindViewHolder(@NonNull VerticalViewHolder holder, int position) {
    holder.tvNum.setText(position + 1 + "");
    holder.tvContent.setText(mList.get(position));
}
@Override
public int getItemCount() {
    return mList == null ? 0 : mList.size();
}
public static class VerticalViewHolder extends RecyclerView.ViewHolder {
    TextView tvNum, tvContent;
    public VerticalViewHolder(View itemView) {
        super(itemView);
        tvNum = itemView.findViewById(R.id.item02_num);
        tvContent = itemView.findViewById(R.id.item02_content);
    }
}

} 4、结果截图 在tab01上实验的效果 View view= inflater.inflate(R.layout.tab01, container, false); RecyclerView recyclerView = view.findViewById(R.id.tab01_Recycleview); List list = new ArrayList<>(); Context context = this.getActivity(); for (int i=1;i<=20;i++){ list.add("这是第"+i+"个框"); } 5、实验小结 用Recyclerview在一个有限的窗口中显示大量的数据集，RecyclerView可以把它理解成一块空间，定义一个RecyclerView，就可以得到这块空间，为此我们将新建一个list为其输入数据，并且还需新建一个Adapter.java文件调用Adapter将list里的数据传入到这块空间里。