所选项目上的RecyclerView错误

时间：2015-11-05 20:35:23

标签： android android-recyclerview horizontalscrollview

我已经使用HorizontalScrollView数据实现了RecyclerView，问题是在我的Adapter代码上，我实现了一个逻辑，当点击一个项目时它会缩放。问题在于video，我不知道发生了什么 - 我用一个boolean或int的课程测试了所有内容，说明了这个项目，然后在{ {1}}询问此项目，如果已​​点击，则再次缩放，如果不是则缩放。

我知道这令人困惑，但视频有助于解释。

我的onBindViewHolder是：

list_row.xml

我拥有此<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" > <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/RLimage" android:layout_centerHorizontal="true" android:layout_centerInParent="true" > <ImageView android:layout_centerInParent="true" android:id="@+id/thumbnail" android:layout_width="50dp" android:layout_height="50dp" android:src="@mipmap/ic_launcher" /> </RelativeLayout> <RelativeLayout android:layout_centerHorizontal="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/RLimage" > <TextView android:layout_marginTop="14dp" android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" android:textColor="#222" android:textSize="12sp"/> </RelativeLayout> </RelativeLayout> 的片段是：

RecyclerView

这是<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <FrameLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom" android:layout_weight="1"> <android.support.v7.widget.RecyclerView android:id="@+id/rcyList" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="-20dp" android:paddingLeft="8dp" android:paddingRight="8dp" /> </FrameLayout>

中的onCreateView() 
Fragment

而@Override public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { this.mContext = getActivity(); View rootView = inflater.inflate(R.layout.fragment_carta, container, false); rv = (RecyclerView) rootView.findViewById(R.id.rcyList); CustomLinearLayoutManager layoutManager = new CustomLinearLayoutManager(mContext); layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); rv.setLayoutManager(layoutManager); // Adding code here dataModelList = new ArrayList<dataModel>(); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); dataModelList.add(new dataModel(ContextCompat.getDrawable(mContext, R.mipmap.ic_launcher),"1234")); adapter = new MyRecyclerViewAdapter(mContext, dataModelList); rv.setAdapter(adapter); return rootView; } 就是这样：

adapter

注意：我也使用this class来避免滚动，如果它不在public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.CustomViewHolder> { private Context mContext; View animatedView = null; private List<dataModel> dataModelList; int animatedIndex = -1; // Initially no view is clicked so -1 //private PopulateListView populateListview; public MyRecyclerViewAdapter(Context context, List<dataModel> items) { this.dataModelList = items; this.mContext = context; //this.populateListview = populateListview; } @Override public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, final int i) { //View per each row final View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, null); CustomViewHolder viewHolder = new CustomViewHolder(view); view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (animatedView == null) { animatedView = view; } else { animatedView.setAnimation(null); animatedView = view; } ScaleAnimation fade_in = new ScaleAnimation(1f, 1.2f, 1f, 1.2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); fade_in.setDuration(200); // animation duration in milliseconds fade_in.setFillAfter(true); // If fillAfter is true, the transformation that this animation performed will persist when it is finished. view.startAnimation(fade_in); } }); return viewHolder; } @Override public void onBindViewHolder(final CustomViewHolder customViewHolder, final int i) { //Setting text view title and drawable dataModel dataModel = dataModelList.get(i); customViewHolder.imageView.setImageDrawable(dataModel.icon); customViewHolder.textView.setText(dataModel.title); if(animatedIndex == i){ ScaleAnimation fade_in = new ScaleAnimation(1f, 1.2f, 1f, 1.2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); fade_in.setDuration(200); // animation duration in milliseconds fade_in.setFillAfter(true); // If fillAfter is true, the transformation that this animation performed will persist when it is finished. customViewHolder.itemView.startAnimation(fade_in); } customViewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { animatedIndex = i; if (animatedView == null) { animatedView = customViewHolder.itemView; } else { animatedView.setAnimation(null); animatedView = customViewHolder.itemView; } //populateListview.PopulateListView(String.valueOf(i)); ScaleAnimation fade_in = new ScaleAnimation(1f, 1.2f, 1f, 1.2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); fade_in.setDuration(200); // animation duration in milliseconds fade_in.setFillAfter(true); // If fillAfter is true, the transformation that this animation performed will persist when it is finished. customViewHolder.itemView.startAnimation(fade_in); } }); } @Override public int getItemCount() { return dataModelList.size(); } public class CustomViewHolder extends RecyclerView.ViewHolder { protected ImageView imageView; protected TextView textView; public CustomViewHolder(View view) { super(view); this.imageView = (ImageView) view.findViewById(R.id.thumbnail); this.textView = (TextView) view.findViewById(R.id.title); } }

上

TL; DR

主要问题是，使用此代码，我可以缩放项目但有些时候，当我滚动（左或右）时，此项目会丢失缩放，我不知道为什么。视频中显示的错误是我猜的关键错误......

4 个答案:

答案 0 :(得分：3)

这种情况正在发生，因为根据定义，您的RecyclerView正在回收其观点。当视图弹出RecyclerView的边界时，它将被废弃，然后与不同的数据模型绑定。当发生这种情况时，视图的转换数据（平移，缩放，旋转）将被重置。

要解决此问题，您需要添加一些指示，将视图缩放到数据模型（例如isSelected）。

在onBindViewHolder方法中，如果选择了视图，则需要检查数据模型，如果选择，则将视图的比例设置为1.2，否则设置为1.0。请注意，在这里您要设置比例，而不是为比例设置动画，因为我们假设当用户触摸视图时动画已经发生。当我们在视图上绑定数据时，我们只是尝试将视图的状态重新创建为上次绑定的状态。

在onCreateViewHolder方法中，您在充气视图上设置onClickListener。在这个新的onClick方法中，您应该设置新的＆＃34; isSelected＆＃34;字段为true / false，具体取决于之前的值。

在onBindViewHolder方法中，您应删除添加新onClickListener的代码（因为这是多余的）。在这里，您应该检查dataModel.isSelected值是否相应，并相应地设置scaleX / scaleY。

请记住，RecyclerView中的视图应被视为原始模板，并由onBindViewHolder方法中绑定它们的数据驱动。你不能依赖它们中已经存在的东西（例如它们的动画值等）。

答案 1 :(得分：1)

我认为这有助于RecyclerView Clicks

答案 2 :(得分：1)

我认为我解决了它尝试将其作为适配器

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Ma7mo0oed on 11/8/2015.
 */
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.CustomViewHolder> {

    private Context mContext;
    View animatedView = null;
    private List<dataModel> dataModelList;
    int animatedIndex = -1; // Initially no view is clicked so -1

    public MyRecyclerViewAdapter(Context context, List<dataModel> items) {
        this.dataModelList = items;
        this.mContext = context;
    }

    @Override
    public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        //View per each row
        final View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, null);
        CustomViewHolder viewHolder = new CustomViewHolder(view);
        return viewHolder;
    }


    @Override
    public void onBindViewHolder(CustomViewHolder customViewHolder, final int i) {
        dataModel dataModel = dataModelList.get(i);
        customViewHolder.imageView.setImageDrawable(dataModel.icon);
        customViewHolder.textView.setText(dataModel.title);
        customViewHolder.setIsRecyclable(false);
        if (animatedIndex == i) {
            animat(customViewHolder.itemView);
        }
        customViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animatedIndex = i;
                animat(v);
            }
        });
    }

    public void animat(View v) {
        if (animatedView == null) {
            animatedView = v;
        } else {
            animatedView.setAnimation(null);
            animatedView = v;
        }
        ScaleAnimation fade_in = new ScaleAnimation(1f, 1.2f, 1f, 1.2f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        fade_in.setDuration(200);     // animation duration in milliseconds
        fade_in.setFillAfter(true);    // If fillAfter is true, the transformation that this animation performed will persist when it is finished.
        v.startAnimation(fade_in);
    }

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

    public class CustomViewHolder extends RecyclerView.ViewHolder {
        protected ImageView imageView;
        protected TextView textView;


        public CustomViewHolder(View view) {
            super(view);
            this.imageView = (ImageView) view.findViewById(R.id.thumbnail);
            this.textView = (TextView) view.findViewById(R.id.title);

        }
    }
}

答案 3 :(得分：1)

正如其他人在答案中建议的那样，这里的问题与View Recycling有关。

我调试了上面的代码，发现滚动时有时onBindViewHolder()没有被调用，导致视图松动了动画效果。因此，在数据模型中使用布尔值并没有帮助。

正如在使用setIsRecyclable(false)的其他答案中所建议的那样，你可以做到这一点，所以你可以肯定地使用它。

另一件事我注意到当您在屏幕上的任何位置滚动时视图滚动，并且为了克服这一点，您可能必须覆盖LinearLayoutManager，但我认为这会弄乱each item view's高度。需要深入研究。

作为替代方案，您可以使用TwoWayView来实现相同而不是RecyclerView。

您可以在TwoWayView

找到相同的库

我已使用TwoWayView测试了您的上述代码，但它运行正常。我在这里发布文件，你可以自己检查。如果您需要更多解释，请询问..

<强> layout_twowayview.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

<org.lucasr.twowayview.TwoWayView 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/lvItems"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:drawSelectorOnTop="false"
    android:orientation="horizontal"
    tools:context=".MainActivity" />

 </LinearLayout>

<强> TwoWayViewActivity 

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import com.savitriya.samples.R;
import com.savitriya.samples.adapter.UsersAdapter;
import com.savitriya.samples.model.DataModel;
import org.lucasr.twowayview.TwoWayView;
import java.util.ArrayList;

/**
* Created by Satyen on 11/7/15.
*/
public class TwoWayViewActivity extends Activity {

ArrayList<DataModel> dataModels;
ScaleAnimation scaleAnimation = null, emptyAnimation = null;
TwoWayView twoWayView;

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

    twoWayView = (TwoWayView) findViewById(R.id.lvItems);
    scaleAnimation = new ScaleAnimation(1f, 1.3f, 1f, 1.3f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    scaleAnimation.setInterpolator(new AccelerateInterpolator());
    scaleAnimation.setStartTime(0);
    scaleAnimation.setDuration(0);     // animation duration in milliseconds
    scaleAnimation.setFillAfter(true);

    emptyAnimation = new ScaleAnimation(1f, 1f, 1f, 1f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    emptyAnimation.setInterpolator(new AccelerateInterpolator());
    emptyAnimation.setStartTime(0);
    emptyAnimation.setDuration(0);     // animation duration in milliseconds
    emptyAnimation.setFillAfter(true);

    dataModels = new ArrayList<>();
    dataModels.add(new DataModel(0, R.mipmap.ic_launcher, "Data 1", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(1, R.mipmap.ic_launcher, "Data 2", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(2, R.mipmap.ic_launcher, "Data 3", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(3, R.mipmap.ic_launcher, "Data 4", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(4, R.mipmap.ic_launcher, "Data 5", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(5, R.mipmap.ic_launcher, "Data 6", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(6, R.mipmap.ic_launcher, "Data 7", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(7, R.mipmap.ic_launcher, "Data 8", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(8, R.mipmap.ic_launcher, "Data 9", 0, emptyAnimation, Color.parseColor("#ffffff")));
    dataModels.add(new DataModel(9, R.mipmap.ic_launcher, "Data 10", 0, emptyAnimation, Color.parseColor("#ffffff")));

    UsersAdapter usersAdapter = new UsersAdapter(TwoWayViewActivity.this, dataModels);
    twoWayView.setAdapter(usersAdapter);
}
}

适配器代码 

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.savitriya.samples.R;
import com.savitriya.samples.model.DataModel;
import java.util.ArrayList;

/**
* Created by Satyen on 11/7/15.
*/
public class UsersAdapter extends ArrayAdapter<DataModel> {

ArrayList<DataModel> users;
ScaleAnimation scaleAnimation = null, emptyAnimation = null;

View view;
int animatedIndex = -1;

// View lookup cache
private static class ViewHolder {
    TextView name;
    ImageView icon;
}

public UsersAdapter(Context context, ArrayList<DataModel> users) {
    super(context, R.layout.list_row, users);
    this.users = users;

    scaleAnimation = new ScaleAnimation(1f, 1.3f, 1f, 1.3f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    scaleAnimation.setInterpolator(new AccelerateInterpolator());
    scaleAnimation.setStartTime(0);
    scaleAnimation.setDuration(0);     // animation duration in milliseconds
    scaleAnimation.setFillAfter(true);

    emptyAnimation = new ScaleAnimation(1f, 1f, 1f, 1f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    emptyAnimation.setInterpolator(new AccelerateInterpolator());
    emptyAnimation.setStartTime(0);
    emptyAnimation.setDuration(0);     // animation duration in milliseconds
    emptyAnimation.setFillAfter(true);

}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // Get the data item for this position
    final DataModel user = getItem(position);
    // Check if an existing view is being reused, otherwise inflate the view
    ViewHolder viewHolder; // view lookup cache stored in tag
    view = convertView;
    if (view == null) {
        viewHolder = new ViewHolder();
        LayoutInflater inflater = LayoutInflater.from(getContext());
        view = inflater.inflate(R.layout.list_row, parent, false);
        viewHolder.name = (TextView) view.findViewById(R.id.title);
        viewHolder.icon = (ImageView) view.findViewById(R.id.thumbnail);
        view.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) view.getTag();
    }
    // Populate the data into the template view using the data object
    viewHolder.name.setText(user.getTitle());
    viewHolder.icon.setImageResource(R.mipmap.ic_launcher);

    view.startAnimation(user.getAnimation());
    // Return the completed view to render on screen

    view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //view.startAnimation(scaleAnimation);
            if (animatedIndex != -1) {
                DataModel dataModel = getItem(animatedIndex);
                dataModel.setAnimation(emptyAnimation);
            }
            animatedIndex = position;
            user.setAnimation(scaleAnimation);
            notifyDataSetChanged();
        }
    });
    return view;
}

@Override
public int getCount() {
    return users.size();
}
}

适配器行 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="120dp"
android:layout_height="120dp"
android:animateLayoutChanges="true"
android:animationCache="true"
android:gravity="center"
android:orientation="vertical">

<RelativeLayout
    android:id="@+id/targetView"
    android:layout_width="80dp"
    android:layout_height="100dp"
    android:padding="5dp">

    <ImageView
        android:id="@+id/thumbnail"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_centerInParent="true"
        android:background="@drawable/rectangle"
        android:scaleType="centerCrop"
        android:src="@drawable/locate" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/thumbnail"
        android:layout_centerHorizontal="true"
        android:text="dafdafda"
        android:textColor="#222"
        android:textSize="12sp" />

</RelativeLayout>

</LinearLayout>
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