Question

我正在尝试对CardView进行动画处理，但是onTouch方法不起作用。视图没有注意到触摸，但是在android studio中有显示以下信息：

自定义视图MaterialCardView调用了setOnTouchListener，但没有覆盖performClick less ...（Strg + F1）如果覆盖onTouchEvent或使用OnTouchListener的View也没有实现performClick并在检测到点击时调用它，则该View可能无法正确处理可访问性操作。理想情况下，应该将处理单击动作的逻辑放在View＃performClick中，因为某些可访问性服务应在发生单击动作时调用performClick。问题ID：ClickableViewAccessibility

我添加了以下内容：所以我添加了这个东西：

@SuppressLint("ClickableViewAccessibility")

但是无论如何它都行不通，但这也许是错误的原因。

这是我的CardViewAdapter.class

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.support.annotation.NonNull;
import android.support.design.card.MaterialCardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;

public class CardViewAdapter extends RecyclerView.Adapter<CardViewAdapter.CardViewHolder> {

    private ArrayList<HashMap<String, String>> listItems;
    private Context context;
    private Resources resources;


    public CardViewAdapter(ArrayList<HashMap<String, String>> listItems, Context context, Resources resources) {
        this.listItems = listItems;
        this.context = context;
        this.resources = resources;
    }

    @NonNull
    @Override
    public CardViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int position) {
        View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_illness_card, parent, false);
        return new CardViewHolder(layoutView);
    }



    @Override
    public void onBindViewHolder(@NonNull CardViewHolder cardViewHolder, final int position) {
        final HashMap<String, String> listItem = listItems.get(position);


        int resID = resources.getIdentifier(listItem.get("image_1"), "drawable", context.getPackageName());

        cardViewHolder.illnessTitle.setText(listItem.get("title_1"));
        cardViewHolder.illnessSubtitle.setText(listItem.get("freetime_1"));
        cardViewHolder.illnessEngagement.setText("");
        cardViewHolder.illnesImage.setBackgroundResource(resID);

        cardViewHolder.cardView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();

                int action = event.getAction();
                if (action == MotionEvent.ACTION_DOWN) {
                    v.setScaleX(0.95f);
                    v.setScaleY(0.95f);

                } else if (action == MotionEvent.ACTION_UP) {
                    v.animate().cancel();
                    v.animate().scaleX(1f).setDuration(1000).start();
                    v.animate().scaleY(1f).setDuration(1000).start();
                }

                return false;
            }
        });



        cardViewHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, ViewPagerPreviewActivity.class);
                intent.putExtra("position", position);
                context.startActivity(intent);
            }
        });
    }

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

    public class CardViewHolder extends RecyclerView.ViewHolder {

        ImageView illnesImage;
        TextView illnessTitle;
        TextView illnessSubtitle;
        LinearLayout linearLayout;
        TextView illnessEngagement;
        MaterialCardView cardView;


        public CardViewHolder(@NonNull View itemView) {
            super(itemView);
            cardView = itemView.findViewById(R.id.materialCard);
            illnesImage = itemView.findViewById(R.id.illness_image);
            illnessTitle = itemView.findViewById(R.id.illness_title);
            illnessSubtitle = itemView.findViewById(R.id.illness_description);
            linearLayout = itemView.findViewById(R.id.linearLayout);
            illnessEngagement = itemView.findViewById(R.id.illness_engagement);


        }

    }
}

如果有人可以帮助我，那将很酷！：）

Answer 1

如文档所述在视图上实现“ OnTouchListener”时，应手动调用“ performClick（）”方法；好？因此您将代码更改为此：

cardViewHolder.cardView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();

                int action = event.getAction();
                if (action == MotionEvent.ACTION_DOWN) {
                    v.setScaleX(0.95f);
                    v.setScaleY(0.95f);

                } else if (action == MotionEvent.ACTION_UP) {
                    v.animate().cancel();
                    v.animate().scaleX(1f).setDuration(1000).start();
                    v.animate().scaleY(1f).setDuration(1000).start();

                    // Here for example
                    performClick();
                }

                return false;
            }
        });

何时调用点击就在您手中！在这里我说过，当action == MotionEvent.ACTION_UP

时调用click

Answer 2

public class CardViewHolder extends RecyclerView.ViewHolder implements View.OnTouchListener {

    ImageView illnesImage;
    TextView illnessTitle;
    TextView illnessSubtitle;
    LinearLayout linearLayout;
    TextView illnessEngagement;
    MaterialCardView cardView;


    public CardViewHolder(@NonNull View itemView) {
        super(itemView);
        cardView = itemView.findViewById(R.id.materialCard);
        illnesImage = itemView.findViewById(R.id.illness_image);
        illnessTitle = itemView.findViewById(R.id.illness_title);
        illnessSubtitle = itemView.findViewById(R.id.illness_description);
        linearLayout = itemView.findViewById(R.id.linearLayout);
        illnessEngagement = itemView.findViewById(R.id.illness_engagement);

    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
            // calling toast should be specific not for all the event's
            //Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();

            int action = event.getAction();
            if (action == MotionEvent.ACTION_DOWN) {
                Toast.makeText(context, "Clicked!", Toast.LENGTH_SHORT).show();  // adding toast here means user has pressed the card.
                v.setScaleX(0.95f);
                v.setScaleY(0.95f);

            } else if (action == MotionEvent.ACTION_UP) {
                v.animate().cancel();
                v.animate().scaleX(1f).setDuration(1000).start();
                v.animate().scaleY(1f).setDuration(1000).start();
            }

            return true;  //this should be true to get further event's
        }
}

我已设置onTouchListener inside ViewHolder来保持代码干净。您从false返回了onTouch()，这是错误。一旦返回 false， 来自 onTouch（）（即ACTION_DOWN），那么您将不会再遇到其他事件，因此从onTouch() return true 继续接受活动的举办。

注意：以下警告可以忽略，无需添加任何注释。

自定义视图MaterialCardView调用了setOnTouchListener，但是不会覆盖performClick less ...（Strg + F1）如果覆盖onTouchEvent或使用OnTouchListener也不实现performClick并在检测到点击时调用它，可能无法正确处理辅助功能。逻辑处理理想情况下，应将点击动作作为某些内容放置在View＃performClick中可访问性服务在应执行单击操作时调用performClick 发生。问题ID：ClickableViewAccessibility

CardView onTouch onClick

2 个答案: