王学岗自定义ViewGroup在哪里获取控件

 

        

            
            

            
        

    
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上面的布局，我们自定义了HistogramView集成ViewGroup。

public class HistogramView extends ViewGroup {}
1

那我们应该在哪里获取HistogramView 中的控件呢？
答案是这个方法。

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
         tvLeft = findViewById(R.id.tvLeft);
        tvRight = findViewById(R.id.tvRight);
        viewBg = findViewById(R.id.viewBg);
    }
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注意这些方法执行的先后顺序是
构造方法————>onFinishInflate——————>setHeightList————>onMeassure(若干次)————>onLayout————>onDraw()
setHeightList是在在Activity中调用的方法。 histogramView.setHeightList(histogramDataBeanList, 100.7f);

下面是柱状图全部代码。可以看看

package cn.xiaozhibo.com.kit.widgets;


import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import cn.xiaozhibo.com.R;
import cn.xiaozhibo.com.kit.bean.HistogramDataBean;
import cn.xiaozhibo.com.kit.third.utils.UIUtils;

public class HistogramView extends ViewGroup {
    //switchButton是否在右侧
    private boolean isRightNumberAndPeriod;
    private Context mContext;
    //  左侧文字的画笔
    private Paint textPaintLeft;
    //    底侧文字的画笔
    private Paint textPaintDown;

    private List heightList;
    //    最高的柱子,需要取整数
    private int heightest;
    //    需要绘制的柱子的数量
    private int columnCount;
    //每个柱子连同它左右的空间的距离
    private int spaceWithLeftRight;
    //    无透明度的画笔
    private Paint abovePaint;
    //    有透明度的画笔
    private Paint downPaint;
    //    左侧文字的大小
    private int leftTextSize;
    //    上侧文字的大小
    private int topTextSize;
    //    底侧文字的大小
    private int bottomTextSize;
    //    一个刻度的像素高度
    private int markSizePx;
    //    一个刻度的高度
    private int markSize;
    //    单位场次的画笔
    private Paint textPaintTop;
    private Paint textPaintTopNote;
    //    底部需要绘制的数据
    private List bottomList = new ArrayList<>();
    //    顶部要绘制的数据
    private String topUnit;

    private String topUnitNote;

    private Rect topUnitRect;
    private Rect leftTextRect;
    //    顶部两个控件的y轴
    private int topRegion;
    private TextView tvLeft;
    private TextView tvRight;
    private View viewBg;
    private final int animationTime = 2000;
    private ValueAnimator valueAnimatorColorFromBlackToWhite;
    private ValueAnimator valueAnimatorColorFromWhiteToBlack;
    private AnimatorSet animatorSetLeftClicked;
    private AnimatorSet animatorSetRightClicked;
    private ValueAnimator valueAnimatorToLeft;
    private ValueAnimator valueAnimatorToRight;

    public HistogramView(Context context) {
        this(context, null);
    }

    public HistogramView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public HistogramView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public HistogramView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initView(context, attrs, defStyleAttr, defStyleRes);
    }


    private void initView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        this.mContext = context;
        setBackgroundResource(R.drawable.shape_white_5);
//        左侧文字的画笔
        textPaintLeft = new Paint();
        textPaintLeft.setAntiAlias(true);
        textPaintLeft.setTextAlign(Paint.Align.RIGHT);
        textPaintLeft.setColor(ContextCompat.getColor(mContext, R.color.gray56));
        textPaintLeft.setTextSize(UIUtils.dip2px(mContext, 9));

//        底侧文字的画笔
        textPaintDown = new Paint();
        textPaintDown.setAntiAlias(true);
        textPaintDown.setTextAlign(Paint.Align.CENTER);
        textPaintDown.setColor(ContextCompat.getColor(mContext, R.color.gray56));
        textPaintDown.setTextSize(UIUtils.dip2px(mContext, 9));

//        顶侧文字的画笔
        textPaintTop = new Paint();
        textPaintTop.setAntiAlias(true);
        textPaintTop.setTextAlign(Paint.Align.LEFT);
        textPaintTop.setColor(ContextCompat.getColor(mContext, R.color.load_more_text));
        textPaintTop.setTextSize(UIUtils.dip2px(mContext, 10));

//        顶侧文字的注释画笔
        textPaintTopNote = new Paint();
        textPaintTopNote.setAntiAlias(true);
        textPaintTopNote.setTextAlign(Paint.Align.LEFT);
        textPaintTopNote.setColor(ContextCompat.getColor(mContext, R.color.gray56));
        textPaintTopNote.setTextSize(UIUtils.dip2px(mContext, 10));

//        不带透明度的画笔
        abovePaint = new Paint();
        abovePaint.setAntiAlias(true);
//        设置笔帽
        abovePaint.setStrokeCap(Paint.Cap.BUTT);
        abovePaint.setStrokeWidth(UIUtils.dip2px(mContext, 20));
        abovePaint.setColor(ContextCompat.getColor(mContext, R.color.orange5));

//         带透明度的画笔
        downPaint = new Paint();
        downPaint.setAntiAlias(true);
        //设置笔帽
        downPaint.setStrokeCap(Paint.Cap.BUTT);
        downPaint.setStrokeWidth(UIUtils.dip2px(mContext, 20));
        downPaint.setColor(ContextCompat.getColor(mContext, R.color.orangeWithAlpha));

        leftTextSize = UIUtils.dip2px(mContext, 31);
        topTextSize = UIUtils.dip2px(mContext, 28);
        bottomTextSize = UIUtils.dip2px(mContext, 25);
        topUnitRect = new Rect();
        leftTextRect = new Rect();
    }

    private void initViews() {
        tvLeft = findViewById(R.id.tvLeft);
        tvRight = findViewById(R.id.tvRight);
        viewBg = findViewById(R.id.viewBg);
        tvLeft.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isRightNumberAndPeriod) {
                    animatorSetLeftClicked.start();
                }
            }
        });
        tvRight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!isRightNumberAndPeriod) {
                    animatorSetRightClicked.start();
                }
            }
        });
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(UIUtils.dip2px(mContext, 355), UIUtils.dip2px(mContext, 255));
        if (heightList == null && heightList.isEmpty()) {
            return;
        }
        View viewChild = getChildAt(0);
        measureChild(viewChild, widthMeasureSpec, heightMeasureSpec);
        this.columnCount = heightList.size();
        this.spaceWithLeftRight = (getMeasuredWidth() - leftTextSize) / columnCount;
        this.markSizePx = (getMeasuredHeight() - topTextSize - bottomTextSize) / 10;
        this.markSize = this.heightest / 10;
        //        求文字的高度，文字随便写
        textPaintLeft.getTextBounds("content", 0, "content".length(), leftTextRect);
        topRegion = getMeasuredHeight() - UIUtils.dip2px(getContext(), 28) - 10 * markSizePx - leftTextRect.height();
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        View childAt = getChildAt(0);
        int right = getMeasuredWidth() - UIUtils.dip2px(getContext(), 12);
        int bottom = topRegion + leftTextRect.height();
        childAt.layout(right - childAt.getMeasuredWidth(), bottom - childAt.getMeasuredHeight(), right, bottom);
        initAnimator();
    }

    @Override
    protected void onDraw(@NonNull Canvas canvas) {
        super.onDraw(canvas);
        if (heightList == null && heightList.isEmpty()) {
            return;
        }
        for (int i = 0; i < heightList.size(); i++) {
            boolean isWithAlpha = heightList.get(i).getHeight() < this.heightest / 2;
            int startX = (int) (leftTextSize + spaceWithLeftRight * i + (spaceWithLeftRight - abovePaint.getStrokeWidth()) / 2);
            int startY = getHeight() - bottomTextSize;
            int endX = startX;
            int endY = (int) (startY - heightList.get(i).getHeight() / markSize * markSizePx);
            canvas.drawLine(startX, startY, endX, endY, isWithAlpha ? downPaint : abovePaint);
            canvas.drawText(bottomList.get(i), startX, getMeasuredHeight() - UIUtils.dip2px(getContext(), 12), textPaintDown);
        }
        for (int i = 0; i < 11; i++) {
            canvas.drawText(String.valueOf(i * markSize), UIUtils.dip2px(getContext(), 24), getMeasuredHeight() - UIUtils.dip2px(getContext(), 23) - i * markSizePx, textPaintLeft);
        }

        textPaintTop.getTextBounds(topUnit, 0, topUnit.length(), topUnitRect);
        canvas.drawText(topUnit, UIUtils.dip2px(getContext(), 10),
                topRegion, textPaintTop);
        if (topUnitNote != null && !topUnitNote.isEmpty()) {
            canvas.drawText(topUnitNote, UIUtils.dip2px(getContext(), 10) + topUnitRect.width(),
                    topRegion, textPaintTopNote);
        }
    }

    public void setHeightList(List heightList, float heightest) {
        this.heightList = heightList;
//        把float转换为大于该值得int
        this.heightest = (int) heightest + 1;
        String[] stringArray;
        if (!isRightNumberAndPeriod) {
            stringArray = getContext().getResources().getStringArray(R.array.number);
            topUnitNote = null;
        } else {
            stringArray = getContext().getResources().getStringArray(R.array.period);
            topUnitNote = getContext().getResources().getString(R.string.unit_session_note);
        }
        this.columnCount = heightList.size();
        this.spaceWithLeftRight = (getMeasuredWidth() - leftTextSize) / columnCount;
        topUnit = getContext().getResources().getString(R.string.unit_session);
        bottomList = Arrays.asList(stringArray);
        invalidate();
    }

    private void initAnimator() {
        valueAnimatorColorFromBlackToWhite = ValueAnimator.ofArgb(ContextCompat.getColor(mContext, R.color.black_333), ContextCompat.getColor(mContext, R.color.white));
        valueAnimatorColorFromBlackToWhite.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int animationValue = (int) animation.getAnimatedValue();
                if (isRightNumberAndPeriod) {
                    tvLeft.setTextColor(animationValue);
                } else {
                    tvRight.setTextColor(animationValue);
                }
            }
        });
        valueAnimatorColorFromWhiteToBlack = ValueAnimator.ofArgb(ContextCompat.getColor(mContext, R.color.white), ContextCompat.getColor(mContext, R.color.black_333));
        valueAnimatorColorFromWhiteToBlack.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int animationValue = (int) animation.getAnimatedValue();
                if (isRightNumberAndPeriod) {
                    tvRight.setTextColor(animationValue);
                } else {
                    tvLeft.setTextColor(animationValue);
                }
            }
        });

//        注意，此时tvUp还没有改变位置。
        valueAnimatorToLeft = ValueAnimator.ofFloat(viewBg.getLeft() + viewBg.getWidth(), viewBg.getLeft());
        valueAnimatorToLeft.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(@NonNull ValueAnimator animation) {
                float animatedValue = (float) animation.getAnimatedValue();
                viewBg.layout((int) animatedValue, viewBg.getTop(), (int) animatedValue + viewBg.getWidth(), viewBg.getBottom());
            }
        });
        valueAnimatorToRight = ValueAnimator.ofFloat(viewBg.getLeft(), viewBg.getLeft() + viewBg.getWidth());
        valueAnimatorToRight.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(@NonNull ValueAnimator animation) {
                float animatedValue = (float) animation.getAnimatedValue();
                viewBg.layout((int) animatedValue, viewBg.getTop(), (int) animatedValue + viewBg.getWidth(), viewBg.getBottom());
            }
        });
        animatorSetLeftClicked = new AnimatorSet();
        AnimatorSet.Builder builderLeftClicked = animatorSetLeftClicked.play(valueAnimatorToLeft);
        builderLeftClicked.with(valueAnimatorColorFromBlackToWhite);
        builderLeftClicked.with(valueAnimatorColorFromWhiteToBlack);
        animatorSetLeftClicked.setDuration(animationTime);
        animatorSetLeftClicked.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                isRightNumberAndPeriod = false;
//                initData(true);
                switchButtonListenner.isRightClicked(false);
                tvLeft.setTextColor(Color.WHITE);
                tvRight.setTextColor(ContextCompat.getColor(mContext, R.color.black_333));
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });

        animatorSetRightClicked = new AnimatorSet();
        AnimatorSet.Builder builderRightClicked = animatorSetRightClicked.play(valueAnimatorToRight);
        builderRightClicked.with(valueAnimatorColorFromBlackToWhite);
        builderRightClicked.with(valueAnimatorColorFromWhiteToBlack);
        animatorSetRightClicked.setDuration(animationTime);
        animatorSetRightClicked.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
//                initData2(false);
                isRightNumberAndPeriod = true;
                switchButtonListenner.isRightClicked(true);
                tvRight.setTextColor(ContextCompat.getColor(mContext, R.color.white));
                tvLeft.setTextColor(ContextCompat.getColor(mContext, R.color.black_333));
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        initViews();
    }

    public interface SwitchButtonListenner {
        void isRightClicked(boolean isRight);

    }

    private SwitchButtonListenner switchButtonListenner;

    public void setSwitchButtonListenner(SwitchButtonListenner switchButtonListenner) {
        this.switchButtonListenner = switchButtonListenner;
    }
}

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Activity中调用

 private void initZhuZhuangChart() {
        histogramView.setSwitchButtonListenner(new HistogramView.SwitchButtonListenner() {
            @Override
            public void isRightClicked(boolean isRight) {
                if (isRight) {
                    initData2();
                } else {
                    initData();
                }
            }
        });
        initData();
    }

    private void initData() {
        List histogramDataBeanList = new ArrayList<>();
        histogramDataBeanList.add(new HistogramDataBean(60.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(100.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(70.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(10.7f, false));
        histogramDataBeanList.add(new HistogramDataBean(90.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(40.7f, false));
        histogramDataBeanList.add(new HistogramDataBean(30.7f, false));
        histogramView.setHeightList(histogramDataBeanList, 100.7f);
    }

    private void initData2() {
        List histogramDataBeanList = new ArrayList<>();
        histogramDataBeanList.add(new HistogramDataBean(60.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(100.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(10.7f, false));
        histogramDataBeanList.add(new HistogramDataBean(90.7f, true));
        histogramDataBeanList.add(new HistogramDataBean(40.7f, false));
        histogramDataBeanList.add(new HistogramDataBean(30.7f, false));
        histogramView.setHeightList(histogramDataBeanList, 100.7f);
    }
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