问题描述
我想创建一个图库应用。我试图复制一些谷歌的设计，但我的图像加载速度要慢得多，而且我的滚动也不是很流畅。可能是因为我的布局文件，但我不知道如何改进。
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:clickable="true"
android:focusable="true"
android:foreground="?attr/selectableItemBackground">
<View
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintDimensionRatio="1:1"/>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:id="@+id/wrapper"
app:layout_constraintDimensionRatio="1:1">
<androidx.appcompat.widget.AppCompatimageView
android:id="@+id/image_item"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/videobg"
android:layout_marginTop="4dp"
android:layout_marginEnd="4dp"
android:padding="5dp"
android:id="@+id/videooverlay"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.AppCompatimageView
android:id="@+id/imageView2"
android:layout_width="0dp"
android:layout_height="15sp"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toEndOf="@id/texttime"
android:layout_marginStart="2dp"
app:srcCompat="@drawable/play" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0:05"
android:textColor="#fff"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:id="@+id/texttime"
android:textSize="10sp" />
</androidx.constraintlayout.widget.ConstraintLayout>
<org.kruemelopment.de.gallerie.ui.AnimatedCheckBox
android:id="@+id/animatedCheckBox"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_gravity="center"
android:layout_margin="2dp"
android:background="@android:color/transparent"
app:border_stroke_width="2dp"
app:color_checked="?colorPrimary"
app:color_tick="?colorPrimary"
app:color_unchecked_stroke="@android:color/white"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintHeight_percent="0.15"
app:layout_constraintStart_toStartOf="@id/image_item"
app:layout_constraintTop_toTopOf="@id/image_item"
app:small_tick="true"
app:tick_stroke_width="2dp" />
<org.kruemelopment.de.gallerie.ui.ImageLabelView
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintWidth_percent="0.125"
android:layout_margin="4dp"
android:id="@+id/labelcountview"
app:layout_constraintDimensionRatio="1:1"/>
</androidx.constraintlayout.widget.ConstraintLayout</androidx.constraintlayout.widget.ConstraintLayout>
这是我的适配器：
public class ImageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements SectionTitle,SharedPreferences.OnSharedPreferencechangelistener {
private final Context mContext;
private final List<BaseList> imageList;
private final int width;
private boolean selected=false;
private final List<Boolean> selectList=new ArrayList<>();
private SelectionListener selectionListener;
private boolean showLabel;
public ImageAdapter(Context c,List<BaseList> imageList){
mContext = c;
this.imageList = imageList;
displayMetrics displayMetrics = new displayMetrics();
((Activity)(c)).getwindowManager().getDefaultdisplay().getMetrics(displayMetrics);
width = displayMetrics.widthPixels/3;
int i=0;
while (i<imageList.size()){
selectList.add(false);
i++;
}
SharedPreferences lol = PreferenceManager.getDefaultSharedPreferences(c);
showLabel=lol.getBoolean("showlabelcount",true);
lol.registerOnSharedPreferencechangelistener(this);
}
@Override
public String getSectionTitle(int position) {
while (!(imageList.get(position) instanceof Listemonat)){
position--;
}
return ((Listemonat) imageList.get(position)).getMonat();
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key) {
if (key.equals("showlabelcount")){
showLabel=sharedPreferences.getBoolean(key,true);
notifyDataSetChanged();
}
}
public static class ViewHolderMedia extends RecyclerView.ViewHolder {
ImageView icon;
ConstraintLayout video;
View view;
AnimatedCheckBox animatedCheckBox;
ImageLabelView imageLabelView;
ConstraintLayout wrapper;
TextView videoduration;
ViewHolderMedia(View itemView) {
super(itemView);
view=itemView;
icon = itemView.findViewById(R.id.image_item);
video = itemView.findViewById(R.id.videooverlay);
animatedCheckBox=itemView.findViewById(R.id.animatedCheckBox);
imageLabelView=itemView.findViewById(R.id.labelcountview);
wrapper=itemView.findViewById(R.id.wrapper);
videoduration=itemView.findViewById(R.id.texttime);
}
}
public static class ViewHolderLabel extends RecyclerView.ViewHolder {
TextView label;
View view;
ViewHolderLabel(View itemView) {
super(itemView);
view=itemView;
label = itemView.findViewById(R.id.textView);
}
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
if (viewType==TYPE_LABEL){
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.monatitem,parent,false);
ViewHolderLabel viewHolder= new ViewHolderLabel(v);
viewHolder.setIsRecyclable(true);
return viewHolder;
}
else{
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_item,false);
ViewHolderMedia viewHolder= new ViewHolderMedia(v);
viewHolder.setIsRecyclable(true);
return viewHolder;
}
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder,int position) {
BaseList item=imageList.get(position);
if (item.getType()==TYPE_LABEL){
ViewHolderLabel viewHolderLabel= (ViewHolderLabel) holder;
Listemonat item2= (Listemonat) item;
viewHolderLabel.label.setText(item2.getMonat());
}
else {
ViewHolderMedia viewHolderMedia= (ViewHolderMedia) holder;
if (item.getType() != TYPE_VIDEO) {
viewHolderMedia.video.setVisibility(View.GONE);
} else {
viewHolderMedia.video.setVisibility(View.VISIBLE);
}
if (item.getType() == TYPE_IMAGE) {
Picasso.get()
.load(Uri.withAppendedpath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,String.valueOf(item.getMediaID())))
.centerCrop()
.fit()
.into(viewHolderMedia.icon);
}
else if (item.getType() == TYPE_VIDEO) {
Picasso.get()
.load(Uri.withAppendedpath(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,String.valueOf(item.getMediaID())))
.centerCrop()
.fit()
.into(viewHolderMedia.icon);
ListVideo item2=(ListVideo) item;
viewHolderMedia.videoduration.setText(item2.getDuration());
}
viewHolderMedia.view.setonLongClickListener(v -> {
if (!selected){
selected=true;
viewHolderMedia.animatedCheckBox.setChecked(true,true);
selectList.set(position,true);
notifyDataSetChanged();
selectionListener.startSelection();
}
return false;
});
viewHolderMedia.view.setonClickListener(v -> {
if (selected){
boolean val=selectList.get(position);
viewHolderMedia.animatedCheckBox.setChecked(!val,!val);
if (!selectList.contains(true)){
resetSelected();
}
}
else{
Intent intent;
if (item.getType()==TYPE_IMAGE) {
intent = new Intent(mContext,ShowImage.class);
intent.putExtra("imageid",item.getMediaID());
}
else{
intent = new Intent(mContext,ShowVideo.class);
intent.putExtra("videoid",item.getMediaID());
}
mContext.startActivity(intent);
}
});
if (selected){
viewHolderMedia.wrapper.getLayoutParams().width= (int) (width*0.9);
viewHolderMedia.animatedCheckBox.setVisibility(View.VISIBLE);
viewHolderMedia.animatedCheckBox.setChecked(selectList.get(position),false);
}
else{
viewHolderMedia.wrapper.getLayoutParams().width= 0;
viewHolderMedia.animatedCheckBox.setVisibility(View.GONE);
}
if (showLabel){
viewHolderMedia.imageLabelView.setVisibility(View.VISIBLE);
viewHolderMedia.imageLabelView.setLabelcount(item.getKeywords().size());
}
else viewHolderMedia.imageLabelView.setVisibility(View.GONE);
}
}
@Override
public long getItemId(int position)
{
return imageList.get(position).getMediaID();
}
@Override
public int getItemCount()
{
return imageList.size();
}
@Override
public int getItemViewType(int position) {
return imageList.get(position).getType();
}
public boolean resetSelected() {
if (!selected) return false;
int i = 0;
while (i < selectList.size()) {
selectList.set(i,false);
i++;
}
selected=false;
notifyDataSetChanged();
selectionListener.endSelection();
return true;
}
public void setSelectionListener(SelectionListener selectionListener) {
this.selectionListener = selectionListener;
}
@Override
public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
super.onViewRecycled(holder);
if (holder instanceof ViewHolderMedia){
((ViewHolderMedia) holder).icon.setimageResource(0);
}
}}
也许你可以帮助我或找到导致它变慢的东西。 我的两个自定义视图速度非常快，我很确定它们不是问题。
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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