Optimize the effectiveness of Android support card view V7 framework
Optimize the effectiveness of Android support card view V7 framework
introduction:
Android support card view V7 framework is a function library commonly used on the Android platform to develop applications with card -type interfaces.However, as the complexity of the application increases, the efficiency of card views may become a problem.This article will introduce some techniques to optimize the performance of the Android support card view V7 framework, and provide related Java code code examples.
1. Use Viewholder mode:
In RecyclerView, in order to reuse the view in the layout, the ViewHolder mode is encouraged.ViewHolder is an object containing all view references in the layout. It can be reused when each presentation is presented to avoid frequent finding the view of the view.The following is an example of using ViewHolder:
public class CardViewHolder extends RecyclerView.ViewHolder {
public TextView titleTextView;
public ImageView imageView;
public CardViewHolder(View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.titleTextView);
imageView = itemView.findViewById(R.id.imageView);
}
}
2. Use DiffUtil to update the information:
When updating the data set in the card view, Diffutil is an efficiency optimization tool that helps to determine the differences between the old and new data sets, and only re -renders the projects that need to be changed, so as to save unnecessary operations.The following is an example of using Diffutil:
DiffUtil.Callback callback = new DiffUtil.Callback() {
@Override
public int getOldListSize() {
return oldData.size();
}
@Override
public int getNewListSize() {
return newData.size();
}
@Override
public boolean areItemsTheSame(int oldPosition, int newPosition) {
return oldData.get(oldPosition).getId() == newData.get(newPosition).getId();
}
@Override
public boolean areContentsTheSame(int oldPosition, int newPosition) {
return oldData.get(oldPosition).equals(newData.get(newPosition));
}
};
DiffUtil.DiffResult result = DiffUtil.calculateDiff(callback);
result.dispatchUpdatesTo(adapter);
3. Use the picture cache:
Card views usually include pictures, which are often loaded from the Internet or local.In order to reduce the time of picture loading, you can use the picture cache library, such as Glide or Picasso.These cache libraries can automatically process the fast collection and loading of the picture, thereby improving the performance of the card view.The following is an example of using the Glide cache library:
Glide.with(context)
.load(imageUrl)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(imageView);
4. Delay loading information:
When the data set in the card view is very large, avoid all the data in one -time loading, and can be switched to paging or rolling loading.This can reduce the time of the initial loading, and also increase the response speed of the view.
in conclusion:
Through the techniques provided above, you can optimize the effectiveness of the Android support card view V7 framework.Using ViewHolder mode, Diffutil, picture cache, and delayed loading data will help improve the speed and efficiency of the card view.
Remarks: Please ensure that the relevant V7 support library has been introduced into the project.
