android – 所选项目上的RecyclerView错误
作者：互联网
我已经使用RecyclerView数据实现了HorizontalScrollView,问题是在我的适配器代码上,我实现了一个逻辑,当单击一个项目时它会缩放.这个问题在这个video上非常明显,我不知道发生了什么 – 我用一个布尔或int的类来测试所有东西,说这个项目被点击然后在theonBindViewHolder上询问这个项目,如果它被点击,然后再次缩放,如果不是则缩放.
我知道这很令人困惑,但视频有助于解释.
我的list_row.xml是：
<?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>
我有这个RecyclerView的片段是这样的：
<?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>
这是我片段中的onCreateView()
@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;
}
适配器是这样的：
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);
}
}
注意：如果它不在RecyclerView上,我也使用this class来避免滚动
TL; DR
主要的问题是,使用这段代码,我可以缩放项目,但有时候,当我滚动(左或右)时,这个项目会丢失缩放,我不知道为什么.视频中显示的错误是我猜的关键错误…
解决方法:
正如其他人在答案中所建议的那样,这里的问题与View Recycling有关.
我调试了上面的代码,发现滚动时有时候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没有帮助.
正如在其他答案中建议的那样,通过使用setIsRecyclable(false)将为您做到这一点,因此您可以绝对使用它.
另一件事我注意到当你在屏幕上的任何地方滚动时视图是滚动的,并且为了克服你可能必须覆盖LinearLayoutManager,但我认为这会弄乱每个项目视图的高度.需要深入研究一下.
作为替代方案,您可以使用TwoWayView来实现相同而不是RecyclerView.
您可以在这里找到相同的库TwoWayView
我用TwoWayView测试了你的上面的代码,它工作正常.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..
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>
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>
标签：android,android-recyclerview,horizontalscrollview 来源： https://codeday.me/bug/20190824/1707520.html