Android 如何设置onclick listener recyclerview并在每次单击时启动新活动

我正在使用

recyclerview

，无法开始新的活动 在每次点击时。如何启动新的活动recyclerview

以下是我的代码：

主要活动：

public class MainActivity extends AppCompatActivity  {

    private List<Data> dataList = new ArrayList<>();
    private RecyclerView recycler_view;
    private Custom_Adapter custom_adapter;

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

        recycler_view = (RecyclerView) findViewById(R.id.recycler_view);

        custom_adapter = new Custom_Adapter(dataList);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        recycler_view.setLayoutManager(mLayoutManager);
        recycler_view.setItemAnimator(new DefaultItemAnimator());
        recycler_view.setAdapter(custom_adapter);

        prepareMovieData();
    }

    private void prepareMovieData() {

        Data data = new Data("Preamble");

        dataList.add(data);

        data = new Data("Parts");
        dataList.add(data);

        data = new Data("Schedules");
        dataList.add(data);

        data = new Data("Amendments");
        dataList.add(data);

        data = new Data("Quiz");
        dataList.add(data);

        custom_adapter.notifyDataSetChanged();
    }
}

---

我想在每次单击时开始新的活动。我该怎么做才能开始新的生活？我可以使用switch case吗？

您应该在Viewholder的onClick方法中启动新活动，如下所示

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

public View view;

public TextView title;

public MyViewHolder(final View itemView)  {
    super(itemView);

    itemView.setOnClickListener(this);
    title=(TextView)itemView.findViewById(R.id.tv_title);

}

@Override
public void onClick(View view) {

// To get context. You can pass it to the adapter from activity when  
// creating the instance of adapter or you can get it from Viewgroup 
// inside onCreateViewHolder using parent.getContext().  

startActivity(new Intent(context, NewActivity.class));

}
}

---

下面是一些代码和一个示例，展示了如何使用switch实现这一点。但是，要使用vertabim，您需要一个适当的回调模式——即，将onClickListener创建为一个匿名类，并将其传递给adapters构造函数。然后让适配器保留一个引用并将其传递给VH onBind

//in Adapter, Viewholder
private View.OnClickListener mCallback;

public Custom_Adapter(List<Data> dataList, View.OnClickListener callback) {
    this.dataList = dataList;
    mCallback = callback;
}

@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
    holder.itemView.setOnClickListener(mCallback);
    holder.itemView.setTag(position);
    ...
}

//in Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    custom_adapter = new Custom_Adapter(dataList, new OnClickListener() {
        @Override
        public void onClick(View view) {

            Class<? extends Activity> target;
            switch( (int) view.getTag() ) {
                case 0:
                    target = PreambleActivity.class;
                    break;
                ...
            }

            if (target != null) {
                Intent intent = new Intent(MainActivity.this, target);
                startActivity(intent);
            }
        }
    });
}

//在适配器、Viewholder中
private View.OnClickListener mCallback；
公共自定义_适配器（列表dataList、View.OnClickListener回调）{
this.dataList=dataList；
mCallback=回调；
}
@凌驾
公共无效onBindViewHolder（MyViewHolder，最终整数位置）{
holder.itemView.setOnClickListener（mCallback）；
holder.itemView.setTag（位置）；
...
}
//活跃
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
...
自定义\u适配器=新的自定义\u适配器（数据列表，新OnClickListener（）{
@凌驾
公共void onClick（视图）{
类，该类将对每个项目硬编码相同的活动，而且startActivity也不可从中使用。将活动引用传递给适配器，只要您不做一些愚蠢的事情，例如将引用保存在适配器中的静态变量中，它就不会导致泄漏。是的，它会将新的单击侦听器附加到每个ViewHolder，这就是为什么您可以这样做。或者只是在适配器的作用域中创建一个单击侦听器并使用它（变量target可能未初始化）。如果（target！=null）{Intent Intent Intent=new Intent（MainActivity.this，target）；startActivity（Intent）；}，那么在创建它时只需将其初始化为null
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener  {

public View view;

public TextView title;

public MyViewHolder(final View itemView)  {
    super(itemView);

    itemView.setOnClickListener(this);
    title=(TextView)itemView.findViewById(R.id.tv_title);

}

@Override
public void onClick(View view) {

// To get context. You can pass it to the adapter from activity when  
// creating the instance of adapter or you can get it from Viewgroup 
// inside onCreateViewHolder using parent.getContext().  

startActivity(new Intent(context, NewActivity.class));

}
}

//in Adapter, Viewholder
private View.OnClickListener mCallback;

public Custom_Adapter(List<Data> dataList, View.OnClickListener callback) {
    this.dataList = dataList;
    mCallback = callback;
}

@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
    holder.itemView.setOnClickListener(mCallback);
    holder.itemView.setTag(position);
    ...
}

//in Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    custom_adapter = new Custom_Adapter(dataList, new OnClickListener() {
        @Override
        public void onClick(View view) {

            Class<? extends Activity> target;
            switch( (int) view.getTag() ) {
                case 0:
                    target = PreambleActivity.class;
                    break;
                ...
            }

            if (target != null) {
                Intent intent = new Intent(MainActivity.this, target);
                startActivity(intent);
            }
        }
    });
}