我在我的应用程序中使用具有多个视图的回收器视图。这工作正常但我滚动此循环视图有问题！当我想要向上和向下滚动它时它会滞后。 这是我的Recycler视图适配器：
public class chatAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<ChatModel> chatArray;
private Context mContext;
public chatAdapter(ArrayList<ChatModel> chatArray, Context mContext) {
this.chatArray = chatArray;
this.mContext = mContext;
}
public static class ViewHolderLeftText extends RecyclerView.ViewHolder {
TextView txtQuestion;
TextView txtAnswer;
LinearLayout answerLayout;
public ViewHolderLeftText(View v) {
super(v);
txtQuestion = (TextView) v.findViewById(R.id.txtQuestion);
txtAnswer = (TextView) v.findViewById(R.id.txtAnswer);
answerLayout = (LinearLayout) v.findViewById(R.id.answerLayout);
}
}
public static class ViewHolderLeftImage extends RecyclerView.ViewHolder {
public ViewHolderLeftImage(View v) {
super(v);
}
}
public static class ViewHolderRightText extends RecyclerView.ViewHolder {
TextView rightTxtQuestion;
TextView rightTxtAnswer;
LinearLayout rightAnswerLayout;
ImageView state;
ImageView userImage;
public ViewHolderRightText(View v) {
super(v);
rightTxtQuestion = (TextView) v.findViewById(R.id.right_txtQuestion);
rightTxtAnswer = (TextView) v.findViewById(R.id.right_txtAnswer);
rightAnswerLayout = (LinearLayout) v.findViewById(R.id.right_answerLayout);
state = (ImageView) v.findViewById(R.id.avatar);
userImage = (ImageView) v.findViewById(R.id.img_User_Image);
}
}
public static class ViewHolderRightImage extends RecyclerView.ViewHolder {
ImageView image;
ImageView state;
public ViewHolderRightImage(View v) {
super(v);
image = (ImageView) v.findViewById(R.id.image);
state = (ImageView) v.findViewById(R.id.avatar);
}
}
public static class ViewHolderLeftTextReply extends RecyclerView.ViewHolder {
TextView leftTextReplyPastQ;
TextView leftTextReplyPastA;
TextView leftTextReplyCurrentQ;
TextView leftTextReplyCurrentA;
public ViewHolderLeftTextReply(View v) {
super(v);
leftTextReplyPastQ = (TextView) v.findViewById(R.id.left_reply_txt_past_question);
leftTextReplyPastA = (TextView) v.findViewById(R.id.left_reply_txt_past_answer);
leftTextReplyCurrentQ = (TextView) v.findViewById(R.id.left_reply_txt_current_question);
leftTextReplyCurrentA = (TextView) v.findViewById(R.id.left_reply_txt_current_answer);
}
}
public static class ViewHolderRightTextReply extends RecyclerView.ViewHolder {
TextView rightTextReplyPastQ;
TextView rightTextReplyPastA;
TextView rightTextReplyCurrentQ;
TextView rightTextReplyCurrentA;
public ViewHolderRightTextReply(View v) {
super(v);
rightTextReplyPastQ = (TextView) v.findViewById(R.id.right_reply_txt_past_question);
rightTextReplyPastA = (TextView) v.findViewById(R.id.right_reply_txt_past_answer);
rightTextReplyCurrentQ = (TextView) v.findViewById(R.id.right_reply_txt_current_question);
rightTextReplyCurrentA = (TextView) v.findViewById(R.id.right_reply_txt_current_answer);
}
}
@Override
public int getItemViewType(int position) {
/******************************Handling Inline Parents**************
* *
* 1 for item_message_text_left
* 2 for item_message_image_left
* 3 for item_message_text_right
* 4 for item_message_image_right
* 5 for item_message_left_reply
* 6 for item_message_right_reply
* 7 for item_message_mine_unSend
* */
if (chatArray.get(position).isLeftText() && (!chatArray.get(position).isLeftReply())) {
return 1;
} else if (chatArray.get(position).isLeftImage()) {
return 2;
} else if (chatArray.get(position).isRightText() && (!chatArray.get(position).isRightReply())) {
return 3;
} else if (chatArray.get(position).isRightImage()) {
return 4;
} else if (chatArray.get(position).isLeftReply()) {
return 5;
} else if (chatArray.get(position).isRightReply()) {
return 6;
} else if (chatArray.get(position).isMineUnSend()) {
return 7;
} else {//When there is no message to show!
return -1;
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Create a new View
final View item_message_text_left = LayoutInflater.from(mContext).inflate(R.layout.item_message_text_left, parent, false);
final View item_message_image_left = LayoutInflater.from(mContext).inflate(R.layout.item_message_image_left, parent, false);
final View item_message_text_right = LayoutInflater.from(mContext).inflate(R.layout.item_message_text_right, parent, false);
final View item_message_image_right = LayoutInflater.from(mContext).inflate(R.layout.item_message_image_right, parent, false);
final View item_message_reply_text_left = LayoutInflater.from(mContext).inflate(R.layout.item_message_reply_text_left, parent, false);
final View item_message_reply_text_right = LayoutInflater.from(mContext).inflate(R.layout.item_message_reply_text_right, parent, false);
if (viewType == 1) {
return new ViewHolderLeftText(item_message_text_left); //For item message text left
} else if (viewType == 2) {
return new ViewHolderLeftImage(item_message_image_left); //For item message image left
} else if (viewType == 3) {
return new ViewHolderRightText(item_message_text_right); //For item message text right
} else if (viewType == 4) {
return new ViewHolderRightImage(item_message_image_right); //For item message image right
} else if (viewType == 5) {
return new ViewHolderLeftTextReply(item_message_reply_text_left); //For item message left text reply
} else if (viewType == 6) {
return new ViewHolderRightTextReply(item_message_reply_text_right); //For item message right text reply
} else if (viewType == 7) {
return new ViewHolderRightText(item_message_text_right); //For item message right text unSend
} else {
return new ViewHolderLeftText(item_message_text_left); //When there is nothing to show!
}
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (holder.getItemViewType()) {
case 1: //For item message text left
ViewHolderLeftText vLText = (ViewHolderLeftText) holder;
vLText.txtQuestion.setText(chatArray.get(position).getCourseForumModel().getCourseForumQuestion());
if (!chatArray.get(position).getCourseForumModel().getCourseForumAnswer().equals("")) {
if (chatArray.get(position).getCourseForumModel().getCourseForumAUser().equals(G.userId)) {
//This Answer is prepared by this user
vLText.answerLayout.setBackgroundColor(mContext.getResources().getColor(R.color.my_message_background_color));
}
vLText.txtAnswer.setText(chatArray.get(position).getCourseForumModel().getCourseForumAnswer());
}
break;
case 2: //For item message image left
ViewHolderLeftImage vLImage = (ViewHolderLeftImage) holder;
break;
case 3: //For item message Text Right
ViewHolderRightText vRText = (ViewHolderRightText) holder;
vRText.rightTxtQuestion.setText(chatArray.get(position).getCourseForumModel().getCourseForumQuestion());
if (!chatArray.get(position).getCourseForumModel().getCourseForumAnswer().equals("")) {
vRText.rightTxtAnswer.setText(chatArray.get(position).getCourseForumModel().getCourseForumAnswer());
}
vRText.state.setImageResource(R.drawable.send_icon);
break;
case 4: //For item message image Right
final ViewHolderRightImage vRImage = (ViewHolderRightImage) holder;
int userFileId = chatArray.get(position).getCourseForumModel().getCourseForumQFile();
FileModel fileModel = InternetService.getSingleFile(userFileId);
Bitmap userImage = BitmapFactory.decodeFile(G.DIR_APP + fileModel.getFileName() + "." + fileModel.getFileExtension());
vRImage.image.setImageBitmap(userImage);
vRImage.state.setImageResource(R.drawable.send_icon);
break;
case 5: //For item message left reply
ViewHolderLeftTextReply vLTReply = (ViewHolderLeftTextReply) holder;
vLTReply.leftTextReplyPastQ.setText(chatArray.get(position).getReplayedMessage().getCourseForumQuestion());
vLTReply.leftTextReplyPastA.setText(chatArray.get(position).getReplayedMessage().getCourseForumAnswer());
vLTReply.leftTextReplyCurrentQ.setText(chatArray.get(position).getCourseForumModel().getCourseForumQuestion());
vLTReply.leftTextReplyCurrentA.setText(chatArray.get(position).getCourseForumModel().getCourseForumAnswer());
break;
case 6: //For item message right reply
ViewHolderRightTextReply vRTReply = (ViewHolderRightTextReply) holder;
vRTReply.rightTextReplyPastQ.setText(chatArray.get(position).getReplayedMessage().getCourseForumQuestion());
vRTReply.rightTextReplyPastA.setText(chatArray.get(position).getReplayedMessage().getCourseForumAnswer());
vRTReply.rightTextReplyCurrentQ.setText(chatArray.get(position).getCourseForumModel().getCourseForumQuestion());
vRTReply.rightTextReplyCurrentA.setText(chatArray.get(position).getCourseForumModel().getCourseForumAnswer());
break;
case 7: //For item message That not send till now
ViewHolderRightText vRUnSendText = (ViewHolderRightText) holder;
String question = chatArray.get(position).getUnSendChats().getCourseForum().getCourseForumQuestion();
int hasFile = chatArray.get(position).getUnSendChats().getHasFile();
vRUnSendText.rightTxtQuestion.setText(question);
vRUnSendText.state.setImageResource(R.drawable.un_send_icon);
if (hasFile == 1) {//This UnSend Message has a file
String filePath = chatArray.get(position).getUnSendChats().getFilePath();
Bitmap unSendImage = BitmapFactory.decodeFile(filePath);
vRUnSendText.userImage.setImageBitmap(unSendImage);
}
break;
case -1: //When there is no message to show
ViewHolderLeftText vLTextForNoMessage = (ViewHolderLeftText) holder;
break;
}
}
public void update(ArrayList<ChatModel> updatedArray) {
chatArray.clear();
chatArray.addAll(updatedArray);
notifyDataSetChanged();
}
@Override
public int getItemCount() {
return chatArray.size();
}
}
这个回收站视图有超过6种我必须显示的视图类型，但是当回收站视图中的项目会增加时，我在向上和向下滚动时会有很多延迟。 我不知道为什么我在滚动时滞后！ 我非常感谢你的帮助。
答案 0 :(得分：2)
我认为问题不是多个布局，而是您在不同布局中进行的图像处理。
如果将大位图设置为较小的imageView，则会占用太多内存。因此最好将图像任务放在不同的线程上，因为你可以使用一些好的图像库，如“Picasso”或“Universal Image Loader”。
有关回收商视图的更多优化提示，Click here
答案 1 :(得分：0)
您可以使用Glide库非常快速地加载图像，并且滚动速度非常快 你可以找到这个Glide图书馆
https://github.com/bumptech/glide
您可以在app模块buil.gradle文件中添加Glide库作为依赖项 在android Studio中打开ProjectStructure并单击应用程序，然后单击对话框右侧的+图标，然后单击库依赖项并搜索滑动，然后您可以添加所有您想要的滑动库 通过这种方式，你可以得到你想要的东西。