简单实现右边字母列表

一时失言乱红尘 2022-07-15 12:38 184阅读 0赞

自定义的联系人列表是左表的字母就是一个重写的view根据手在屏幕上滑动到相应的距离显示相应的字母这就要你自己计算好相应的距离

public class MyTextView extends View {
        private Paint paint = new Paint(Color.BLUE);
        private int width=0,height=0;
        private TextView textView;
        private ArrayList<SaveCity> saveCities;
        private ArrayList<Float> saveInt = new ArrayList<>();
        private ArrayList<String> arrayList = new ArrayList<>();
        private RecyclerView recyclerView;
        private int savePre=0;
        private LinearLayoutManager manager;
        private String[] someZimu = new String[]{
      "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L" , "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
        public MyTextView(Context context, AttributeSet attrs) {
            super(context, attrs);
            getDisplaySize();
        }
    
        public MyTextView(Context context) {
            super(context);
        }
    
        @Override
        public boolean dispatchTouchEvent(MotionEvent event) {
            float y=event.getY();
            float height=getHeight()/26;
            switch (event.getAction()) {
    
                case MotionEvent.ACTION_UP:
                    textView.setVisibility(GONE);//这是要显示的大字母
                    break;
                default:
                    textView.setVisibility(VISIBLE);
                    for (int i=0;i<26;i++) {

//手机移到不同的地方显示不同的字母
                        if (y>saveInt.get(i) && y<(saveInt.get(i)+height)){
                            textView.setText(arrayList.get(i));
                            int j = getPosition(arrayList.get(i));
                            Log.d("aa", j + "=j");
    
                           recyclerView.scrollToPosition(j-1);
    
                        }
                    }
            }
            return true;
        }
    
        @Override
        protected void onDraw(Canvas canvas) {

//将每个字母都绘制在不同的高度
            for (int i=0;i<26;i++) {
                String c = someZimu[i];
                arrayList.add(c);
                paint.setTextSize(24);
    
                int j=50+i*30;
                canvas.drawText(c+"",20,j,paint);
                saveInt.add((float)j);
            }
    
        }
    
        public void setRecycle(RecyclerView recycle, ArrayList<SaveCity> saveCities, LinearLayoutManager manager) {
            this.recyclerView=recycle;
            this.saveCities=saveCities;
            this.manager=manager;
            Log.d("aa", saveCities.get(1).getCitys());
        }
    
        public int getPosition(String s) {
            int i=0;
            for (SaveCity saveCity : saveCities) {
                i++;
                String zimu=saveCity.getCitys();
    
                if (zimu.equals(s)) {
                    Log.d("ss", zimu);
                    savePre=i;
                    break;
                }
    
            }
    
            return savePre;
        }
       /* @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = MeasureSpec.getMode(widthMeasureSpec); int wMode = MeasureSpec.getSize(widthMeasureSpec); int height = MeasureSpec.getMode(heightMeasureSpec); int hMode = MeasureSpec.getMode(heightMeasureSpec); if (hMode == MeasureSpec.AT_MOST) { height=1000; } setMeasuredDimension(width,height); }*/

//获取屏幕的宽度和高度 public void getDisplaySize() {
            WindowManager wm=  (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
             width=wm.getDefaultDisplay().getWidth();
             height=wm.getDefaultDisplay().getHeight();
    
    
        }
    
        public void setTextView(TextView textView) {
            this.textView=textView;
        }
    
    
    }