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Android 发布时间：2022-04-28 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了Android侧边栏滑动切换的view效果，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

废话不多说了，直接给大家贴代码了，具体代码如下所示：

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.bitmapDrawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class SideBar extends View {
  private static final int MARGIN_BOTTOM = 2;
  privatE int mItemHeight = 18;
  private OnLetterTouchListener mOnLetterTouchListener;
  private Paint mPaint;
  private float mWidthCenter;
  privatE int BACkgroundColor = 0x00F0F0F0;
  private char[] chars = AppCommon.INDEXER_CHARS;
  public interface OnLetterTouchListener {
    public abstract void onPressedDown(int index,char ch);
    public abstract void onPressedUp(int index,char ch);
  }
  public SideBar(Context context) {
    this(context,null);
  }
  public SideBar(Context context,AttributeSet attrs) {
    this(context,attrs,-1);
  }
  public SideBar(Context context,AttributeSet attrs,int defStylE) {
    super(context,defStylE);
    init();
  }
  privatE int startY = 0;//其实位置的y轴坐标
  public SideBar setChars(char[] chars) {
    this.chars = chars;
//   for(int i = 0 ; i < (26 - chars.length) / 2 ; i++){
//     startY += i * mItemHeight;
//   }
    init();
    posTinvalidate();
    return this;
  }
  private void init() {
    mPaint = new Paint();
    mPaint.setColor(0xFFCFCFD0);
    mPaint.setAntiAlias(true);
    mPaint.setFakeBoldText(true);
    mPaint.setTextSize(32);
    mPaint.setColor(getresources().getColor(R.color.bluE));
    mPaint.setSubpixelText(true);
    mPaint.setTextAlign(Paint.Align.CENTER);
    setBACkgroundColor(BACkgroundColor);
  }
  public Boolean onTouchEvent(MotionEvent event) {
    super.onTouchEvent(event);
    int idx = (int) event.getY() / mItemHeight;
    if (idx >= chars.length) {
      idx = chars.length - 1;
    } else if (idx < 0) {
      idx = 0;
    }
    if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {
      setBACkgroundresource(R.color.sidebar_SELEcT_Background);
      if (mOnLetterTouchListener != null) {
        mOnLetterTouchlistener.onPressedDown(idx,chars[idx]);
      }
    } else if (event.getAction() == MotionEvent.ACTION_Up) {
      setBACkgroundDrawable(new BitmapDrawable());
      setBACkgroundColor(BACkgroundColor);
      if (mOnLetterTouchListener != null) {
        mOnLetterTouchlistener.onPressedUp(idx,chars[idx]);
      }
    }
    return true;
  }
  @Override
  protected void onSizeChanged(int w,int h,int oldw,int oldh) {
    mItemHeight = (h - MARGIN_BOTTOM) / 26;
    mWidthCenter = getMeasuredWidth() / 2;
    super.onSizeChanged(w,h,oldw,oldh);
  }
  protected void onDraw(Canvas canvas) {
    for (int i = 0; i < chars.length; i++) {
      canvas.drawText(@R_696_10495@ng.valueOf(chars[i]),mWidthCenter,startY + mItemHeight + (i * mItemHeight),mPaint);
    }
    super.onDraw(canvas);
  }
  public void setOnLetterTouchListener(OnLetterTouchListener listener) {
    mOnLetterTouchListener = listener;
  }
}