Question

我是Android编程的新手，并尝试设置点击监听器来打开另一个活动。列表加载正常，但是当我单击项目时，没有任何反应。这是我的适配器：

public interface OnItemClickListener {
    void onItemClick(Product product);
}

private List<Product> productList;
private double currentLatitude, currentLongitude;
private Context context;
private final OnItemClickListener listener;

public AdapterForProducts(List<Product> productList, OnItemClickListener listener, double currentLatitude, double longitude, Context context){
    this.currentLatitude = currentLatitude;
    this.currentLongitude = longitude;
    this.productList = productList;
    this.context = context;
    this.listener = listener;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout, parent, false);
    ViewHolderForProducts holder = new ViewHolderForProducts(view);
    return holder;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
    //Use the provided View Holder on the onCreateViewHolder method to populate the current row on the RecyclerView
    ViewHolderForProducts holder = (ViewHolderForProducts) viewHolder;

    Product product = productList.get(position);
    String distanceText = "Distancia: " + round(distance(product.getLatitude(), product.getLongitude())) + " meters";
    holder.bind(productList.get(position), listener, distanceText);


}

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

viewHolder：

public ViewHolderForProducts(View view){
    super(view);
    cardView = (CardView) itemView.findViewById(R.id.cardView);
    name = (TextView) view.findViewById(R.id.product_name);
    value = (TextView) view.findViewById(R.id.product_value);
    distance = (TextView) view.findViewById(R.id.product_distance);
}



public void bind(final Product product, final AdapterForProducts.OnItemClickListener listener,
                 String distanceText) {
    name.setText(product.getName());
    value.setText("Preço: " + product.getValue());

    distance.setText(distanceText);

    itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            listener.onItemClick(product);
        }
    });

}

我在这样的活动中称呼它：

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search_and_show_product_list);

    Bundle extras = getIntent().getExtras();

    if (extras != null) {
        latitude = extras.getDouble("latitude");
        longitude = extras.getDouble("longitude");
    }
    query = "";
    query_field = (EditText) findViewById(R.id.query_field);
    searchButton = (Button) findViewById(R.id.searchProductButton);

    requestQueue = Volley.newRequestQueue(getApplicationContext());

    recyclerView = (RecyclerView) findViewById(R.id.recycler);
    productList = new ArrayList<>();

    fillProductListByName();

    adapterForProducts = new AdapterForProducts(productList, new AdapterForProducts.OnItemClickListener() {
        @Override
        public void onItemClick(Product product) {
            showProductOnMap(product);
        }
    }, latitude, longitude, getApplication());

    recyclerView.setAdapter(adapterForProducts);
    adapterForProducts.notifyDataSetChanged();
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    searchButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            query = query_field.getText().toString();
            productList.clear();
            fillProductListByName();
            adapterForProducts.notifyDataSetChanged();

        }
    });
}

这是列表项xml：

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="@dimen/activity_vertical_margin"
    android:clickable="true"
    android:focusable="true"
    android:foreground="?android:attr/selectableItemBackground"
    app:cardCornerRadius="@dimen/activity_vertical_margin"
    app:cardElevation="@dimen/activity_vertical_margin">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:clickable="true"
        android:padding="16dp">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginRight="16dp" />

        <TextView
            android:id="@+id/product_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/imageView"
            android:layout_toRightOf="@+id/imageView"
            android:text="Product Name"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/product_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="15dp"
            android:layout_marginStart="15dp"
            android:layout_toRightOf="@+id/product_name"
            android:text="Price: " />

        <TextView
            android:id="@+id/product_distance"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="51dp"
            android:layout_marginStart="51dp"
            android:layout_toEndOf="@+id/product_value"
            android:layout_toRightOf="@+id/product_value"
            android:text="Distance:" />

    </RelativeLayout>

Answer 1

我得到了它的工作。显然，如果列表项中有其他可点击对象，则此实现不起作用，如下所示：

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorAccent"
    android:clickable="true"
    android:padding="16dp">

我所做的就是擦除android：clickable =＆＃34; true＆＃34;来自RelativeLayout

Answer 2

将attr android:clickable="true"设置为父布局时，单击方法

itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            listener.onItemClick(product);
        }
    });

只有在其子女没有设置clickable = true或设置OnClickListener时才会被调用。

实际上，您并不需要所有这些android:clickable="true"。

当您设置android:clickable="true"时，您要为此视图设置空ClickListener。

单击事件将传递到布局层次结构中的最低视图，并且实现了ClickListener，即使是空体也是如此。这是您的错误的原因，因此您必须删除android:clickable="true"。删除android:clickable="true"，删除空ClickListener，现在布局层次结构中的最低视图是使用此ClickListener的CardView：

itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                listener.onItemClick(product);
            }
        });

所以，这是将被调用的ClickListener。

尝试将click侦听器设置为recyclerView

2 个答案: