Question

我正在与recyclerview合作，我无法开始新的活动每次点击。如何开始新活动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();
    }
}

适配器：

public class Custom_Adapter extends RecyclerView.Adapter<Custom_Adapter.MyViewHolder>  {

    private List<Data> dataList;

    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) {
        }
    }

    public Custom_Adapter(List<Data> dataList) {
        this.dataList = dataList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(final ViewGroup parent, final int position) {

        final View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.data_list_row,parent,false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {

        Data data = dataList.get(position);
        holder.title.setText(data.getTitle());

    }

    @Override
    public int getItemCount() {
        return dataList.size();
    }
}

Data.java：

public class Data {

    String title;

    public Data(){}

    public Data(String title){
        this.title=title;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String name) {
        this.title = name;
    }
}

我想在每次点击时开始新活动。我应该怎么做才能开始新的？我可以使用开关盒吗？

Answer 1

下面是一些代码，其中有一个示例，说明如何使用此开关。但是，要使用它Vertabim你需要一个适当的回调模式 - 即。将onClickListener创建为匿名类，并将其传递给适配器构造函数。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);
            }
        }
    });
}

Answer 2

您应该在Viewholder的onClick方法中启动新活动，如下所示

select count(*)
from files
where folder_id in (select id from folders where folder_path like 'A/B%');

如何设置onclick侦听器recyclelerview并在每次单击时启动新活动

2 个答案: