Question

当我点击recyclerView的某个项目时，其他项目也会改变其可见性。我有一个recyclerView：

<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/apps_installed_list"
    android:name="com.campanon.bipbip.activities.ListAppsActivity"
    android:layout_width="380dp"
    android:layout_height="0dp"
    android:layout_marginTop="8dp"
    app:layoutManager="LinearLayoutManager"
    app:layout_constraintBottom_toTopOf="@+id/button_cancel"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInstalledApps"
    tools:listitem="@layout/app_installed_item_list">

行项目布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:background="?android:attr/selectableItemBackground"
android:layout_height="wrap_content">
<ImageView
    android:id="@+id/app_icon"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_marginEnd="5dp"
    android:padding="3dp"
    android:scaleType="centerCrop"
    app:layout_constraintEnd_toStartOf="@+id/app_name"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />


<TextView
    android:id="@+id/app_name"
    android:layout_width="272dp"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:textStyle="bold"
    app:layout_constraintBottom_toTopOf="@+id/app_package"
    app:layout_constraintStart_toEndOf="@+id/app_icon"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_chainStyle="packed" />

<TextView
    android:id="@+id/app_package"
    android:layout_width="272dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:gravity="center_vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toStartOf="@+id/app_name"
    app:layout_constraintTop_toBottomOf="@+id/app_name" />


<ImageView
    android:id="@+id/selected_app"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="8dp"
    android:visibility="invisible"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/app_name"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/ic_done_black_24dp" />
</android.support.constraint.ConstraintLayout>

当我点击某个项目时，最后一个ImageView（selected_app）会更改其可见性。我不知道为什么列表中的其他项目也只需点击一下即可更改可见性。

这是应用程序上的列表：

在适配器中，我使用holder.view实现了点击：

public class ListAppsInstalledAdapter extends RecyclerView.Adapter<ListAppsInstalledAdapter.ViewHolder> {

private List<ApplicationInfo> appsList = null;
private PackageManager packageManager;
private Context context;
CustomItemClickListener listener;
private static List<ApplicationInfo> appsSelected;


public static List<ApplicationInfo> getAppsSelected() {
    return appsSelected;
}

public ListAppsInstalledAdapter(Context context, List<ApplicationInfo> appsList, CustomItemClickListener listener) {
    this.appsList = appsList;
    this.context = context;
    this.packageManager = context.getPackageManager();
    this.listener = listener;
    appsSelected = new ArrayList<>();
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.app_installed_item_list, parent, false);

    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    final ApplicationInfo applicationInfo = appsList.get(position);

    holder.appName.setText(applicationInfo.loadLabel(packageManager));
    holder.packageName.setText(applicationInfo.packageName);
    holder.iconview.setImageDrawable(applicationInfo.loadIcon(packageManager));

    holder.mView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (holder.selectedApp.getVisibility() == View.INVISIBLE) {
                holder.selectedApp.setVisibility(View.VISIBLE);
                appsSelected.add(applicationInfo);
            } else {
                holder.selectedApp.setVisibility(View.INVISIBLE);
                appsSelected.remove(applicationInfo);
            }
            listener.onItemClick(view, position);
        }
    });

}

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


public class ViewHolder extends RecyclerView.ViewHolder {
    public final TextView appName;
    public final TextView packageName;
    public ImageView iconview;
    public ImageView selectedApp;
    public final View mView;



    public ViewHolder(View view) {
        super(view);
        mView = view;
        appName = (TextView) view.findViewById(R.id.app_name);
        packageName = (TextView) view.findViewById(R.id.app_package);
        iconview = (ImageView) view.findViewById(R.id.app_icon);
        selectedApp = (ImageView) 
view.findViewById(R.id.selected_app);

    }


}


}

我不知道该怎么做：（

Answer 1

看看是否有效：

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class ListAppsInstalledAdapter extends RecyclerView.Adapter<ListAppsInstalledAdapter.ViewHolder> {

    private List<ApplicationInfo> appsList = null;
    private PackageManager packageManager;
    private Context context;
    CustomItemClickListener listener;
    private static List<ApplicationInfo> appsSelected;
    private List<Integer> selectedPos = new ArrayList<>();


    public static List<ApplicationInfo> getAppsSelected() {
        return appsSelected;
    }

    public ListAppsInstalledAdapter(Context context, List<ApplicationInfo> appsList, CustomItemClickListener listener) {
        this.appsList = appsList;
        this.context = context;
        this.packageManager = context.getPackageManager();
        this.listener = listener;
        appsSelected = new ArrayList<>();
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.app_installed_item_list, parent, false);

        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        final ApplicationInfo applicationInfo = appsList.get(position);

        holder.appName.setText(applicationInfo.loadLabel(packageManager));
        holder.packageName.setText(applicationInfo.packageName);
        holder.iconview.setImageDrawable(applicationInfo.loadIcon(packageManager));

        if(selectedPos.contains(position)){
            holder.selectedApp.setVisibility(View.VISIBLE);
        }else {
            holder.selectedApp.setVisibility(View.INVISIBLE);
        }

    }

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


    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        public final TextView appName;
        public final TextView packageName;
        public ImageView iconview;
        public ImageView selectedApp;
        public final View mView;

        @Override
        public void onClick(View v) {
            Integer pos = getAdapterPosition();
            if(selectedPos.contains(pos)){
                selectedPos.remove(pos);
            }else{
                selectedPos.add(pos);
            }
            listener.onItemClick(v, getAdapterPosition());

        }

        public ViewHolder(View view) {
            super(view);
            mView = view;
            appName = (TextView) view.findViewById(R.id.app_name);
            packageName = (TextView) view.findViewById(R.id.app_package);
            iconview = (ImageView) view.findViewById(R.id.app_icon);
            selectedApp = (ImageView)
                    view.findViewById(R.id.selected_app);

            view.setOnClickListener(this);
        }


    }


}

在您的接口实现中，调用适配器中的notifyDatasetChanged()以使用所选位置重新加载recyclerview。

为什么ImageView的可见性重复当我点击recyclerView的项目时？

1 个答案: