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The simplest way to display Strings with icons in a RecyclerView

(2 个回答)


5年前关闭。




我需要添加一个 Activity我可以在这里列出 ArrayList<CustomClass> 的元素我已经看到有一种更新更好的方式来显示列表 - RecyclerView .

我的问题是如何将其实现到我的应用程序中。
我发现我需要使用 Adapter ，但我不太明白如何正确实现整个过程。

如果你想知道，我指的是 this我一直在阅读的文档示例。

编辑:

更新我的代码后，它说它无法解析符号 setOnEntryClickListener :

public class voting extends Activity {


RecyclerView myList;
private ArrayList<Player> players; // Players


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

    Intent intent = this.getIntent();
    Bundle bundle = intent.getExtras();
    players = (ArrayList<Player>)bundle.getSerializable("PLAYERS");

    myList = (RecyclerView) findViewById(R.id.charactersList);
    myList.setLayoutManager(new LinearLayoutManager(this));
    CoursesAdapter adapter = new CoursesAdapter(players);
    myList.setAdapter(adapter);
}

// OR RecyclerView with a click listener

CoursesAdapter clickAdapter = new CoursesAdapter(players);
clickAdapter.setOnEntryClickListener(new CoursesAdapter.OnEntryClickListener() {
    @Override
    public void onEntryClick(View view, int position) {
        // stuff that will happen when a list item is clicked
    }
});
recyclerView.setAdapter(clickAdapter);
}

    @Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}


private OnEntryClickListener mOnEntryClickListener;

public interface OnEntryClickListener {
    void onEntryClick(View view, int position);
}

public void setOnEntryClickListener(OnEntryClickListener onEntryClickListener) {
    mOnEntryClickListener = onEntryClickListener;
}



}

最佳答案

我记得我第一次读到 RecyclerView 的时候s - 我同意一开始可能有点困惑。希望这个解释能帮助你更好地理解它。

RecyclerView 基础知识

1. 添加 RecyclerView
首先你需要添加你的 RecyclerView到您的 XML 布局。我假设你知道如何做到这一点。您还可以在 Java 代码中声明它:

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.your_recycler_view);

ExampleViewHolder(View itemView) {
    super(itemView);
    text1 = (TextView) itemView.findViewById(R.id.text1);
    text2 = (TextView) itemView.findViewById(R.id.text2);
}

private ArrayList<CustomClass> mCustomObjects;

public ExampleAdapter(ArrayList<CustomClass> arrayList) {
    mCustomObjects = arrayList;
}

@Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(android.R.layout.simple_list_item_2, parent, false);
    return new ExampleViewHolder(view);
}

@Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
    CustomClass object = mCustomObjects.get(position);

    String firstText = object.getFirstText()
    String secondText = object.getSecondText()

    holder.text1.setText(firstText);
    holder.text2.setText(secondText);
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.your_recycler_view);

recyclerView.setLayoutManager(new LinearLayoutManager(this));

ExampleAdapter adapter = new ExampleAdapter(yourCustomArrayList);
recyclerView.setAdapter(adapter);

public class ExampleClickViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    TextView text1, text2;

    ExampleClickViewHolder(View itemView) {
        super(itemView);

        // we do this because we want to check when an item has been clicked:
        itemView.setOnClickListener(this);

        // now, like before, we assign our View variables
        title = (TextView) itemView.findViewById(R.id.text1);
        subtitle = (TextView) itemView.findViewById(R.id.text2);
    }

    @Override
    public void onClick(View v) {
        // The user may not set a click listener for list items, in which case our listener
        // will be null, so we need to check for this
        if (mOnEntryClickListener != null) {
            mOnEntryClickListener.onEntryClick(v, getLayoutPosition());
        }
    }
}

private OnEntryClickListener mOnEntryClickListener;

public interface OnEntryClickListener {
    void onEntryClick(View view, int position);
}

public void setOnEntryClickListener(OnEntryClickListener onEntryClickListener) {
    mOnEntryClickListener = onEntryClickListener;
}

ExampleClickAdapter clickAdapter = new ExampleClickAdapter(yourObjects);
clickAdapter.setOnEntryClickListener(new ExampleClickAdapter.OnEntryClickListener() {
    @Override
    public void onEntryClick(View view, int position) {
        // stuff that will happen when a list item is clicked
    }
});
recyclerView.setAdapter(clickAdapter);

关于java - 如何在 RecyclerView 中显示 ArrayList？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37786796/