How to create big dynamic view in android?

Question

i have a big problem with creating and removing views in many times

For example i searched in sqlite database and fetching 200 records, and i want create 200view in my activity but it happen in 3 or 4 seconds and it is bad for user experiences and performances.how to increase time for creating views every time?

These are my codes for creating views

public class CreateView {

    boolean header_flag=false;
    boolean first_widget=false;
    LinearLayout header_layout;

    List<Words_taha> words_tahaList=new ArrayList<>();




    public   void createHeader(Context context, LinearLayout main_layout, Words_taha words){



        if(header_flag==false){
            header_layout  =new LinearLayout(context);
            header_layout=new LinearLayout(context);
            header_layout.setOrientation(LinearLayout.HORIZONTAL);
            header_layout.setBackgroundResource(R.mipmap.sure_template);
            header_layout.setId(words.getW_id());

            header_layout.setGravity(Gravity.CENTER);

            main_layout.addView(header_layout);



            header_flag=true;

            words_tahaList.add(words);

        }
        else {

            words_tahaList.add(words);

            Collections.reverse(words_tahaList);


            for(int i=0;words_tahaList.size()>i;i++){

                TextView textView=new TextView(context);
               textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                       LinearLayout.LayoutParams.WRAP_CONTENT));

                textView.setText(words_tahaList.get(i).getW_text()+" ");
                textView.setTag(words_tahaList.get(i).getW_id());
                Typeface typeface=Typeface.createFromAsset(context.getAssets(),"fonts/arabicNeirizi.ttf");
                textView.setTypeface(typeface);
                textView.setTextColor(Color.parseColor("#000000"));

                header_layout.addView(textView);
            }

            words_tahaList.clear();
            header_flag=false;

        }



    }


   public void createLabelForMainWordsInOneLine(Activity context, LinearLayout main_layout, List<Words_taha> words_tahaList, int count ){


        LinearLayout linearLayout=new LinearLayout(context);

        linearLayout.setOrientation(LinearLayout.HORIZONTAL);
       linearLayout.setGravity(Gravity.CENTER);


       if(words_tahaList.size()>0) {


           main_layout.addView(linearLayout);
           Collections.reverse(words_tahaList);

           for (Words_taha w : words_tahaList) {

               DroidTextView textView = new DroidTextView(context);

               textView.setText(w.getW_text());
               textView.setTag(w.getW_id());
               textView.setTextColor(Color.parseColor("#000000"));


               if (w.getW_type() == 3) {

                   textView.setLayoutParams(new LinearLayout.LayoutParams(130, 130));
                   textView.setGravity(Gravity.CENTER);
                   textView.setBackgroundResource(R.mipmap.sore);
               } else {
                  textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                         LinearLayout.LayoutParams.WRAP_CONTENT));



               }


               linearLayout.addView(textView);


           }

           words_tahaList.clear();


       }


    }

Please help me how to optimization my code Thanks.

Answer 1

Well there are a views in android that made for this specific purpose, like ListView or RecyclerView and more, those views get Adapter object, the Adapter restore the data (in your case your 200 rows) and ListView For Example create only the Items That apear in the screen, And when the user scroll up ro down, ListView create the new Views that apear and delete the olds, this give to the user a fantastic use in huge lists of items, I recommend to lern use with ListView and Adapter if you must use your own custom View you can extends from ListView and implemnt in your own way.

you can read more here

if your want specific gui that diffrent from ListView or you need help let me know

Update : if you want to create your own impl what do you think about this direction ?

public abstract class CustomBookView extends LinearLayout implements CustomBookListener {

private int pageIndex = 0;
private List<WordsTasa> wordsList;

public CustomBookView(Context context, int pageIndex, List<WordsTasa> wordsList) {
    super(context);
    this.pageIndex = pageIndex;
    this.wordsList = wordsList;
}

public abstract View createPage(WordsTasa wordsTasa);

@Override
public void goNextPage() {
    if(wordsList.size()>=pageIndex+1)
        return;

    this.removeAllViews();
    //add your animation
    this.addView(createPage(wordsList.get(++pageIndex)));
}

@Override
public void goPreviousPage() {
    if(0<pageIndex-1)
        return;

    this.removeAllViews();
    //add your animation
    this.addView(createPage(wordsList.get(--pageIndex)));
}

public int getPageIndex() {
    return pageIndex;
}

public void setPageIndex(int pageIndex) {
    this.pageIndex = pageIndex;
}

public List<WordsTasa> getWordsList() {
    return wordsList;
}

public void setWordsList(List<WordsTasa> wordsList) {
    this.wordsList = wordsList;
}

public CustomBookView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomBookView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}


public static class WordsTasa {
    private String words;

    public WordsTasa(String words) {
        this.words = words;
    }

    public String getWords() {
        return words;
    }

    public void setWords(String words) {
        this.words = words;
    }
}

}

 public interface CustomBookListener {

void goNextPage();
void goPreviousPage();

}

on your next page button or previous

button.setOnClickListener(new View.OnClickListener {

public void onClick(View v) {
    customBookListener.goNextPage();
}

})