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将定义水平seekbar旋转-90度, 直接上代码

package com.android.systemui.statusbar.car.hvac;import android.widget.SeekBar;import android.content.Context;import android.graphics.Canvas;import android.annotation.NonNull;import android.annotation.Nullable;import android.util.AttributeSet;import android.view.MotionEvent;import android.annotation.SuppressLint;import android.content.res.TypedArray;import android.util.Log;import com.android.systemui.R;import com.android.systemui.Dependency;public class CarVerticalSeekBar extends SeekBar implements HvacSeekBar, HvacComponent {
       private static final String TAG = "CarVerticalSeekBar";    private static final boolean DEBUG = true;    private OnSeekBarChangeListener mOnSeekBarChangeListener;    private final int mAreaId;    private final int mPropertyId;    private final int mHvacOffset;    private final int mLastPostion;    public CarVerticalSeekBar(@NonNull Context context, @Nullable AttributeSet attrs) {
           super(context, attrs);        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CarVerticalSeekBar);        try {
               mAreaId = typedArray.getInt(R.styleable.CarVerticalSeekBar_hvacAreaId, -1);            mPropertyId = typedArray.getInt(R.styleable.CarVerticalSeekBar_hvacPropertyId, -1);            mHvacOffset = typedArray.getInt(R.styleable.CarVerticalSeekBar_hvacOffset, -1);        } finally {
               typedArray.recycle();        }        if (DEBUG) {
               Log.i(TAG, "mAreaId :" + mAreaId);            Log.i(TAG, "mPropertyId :" + mPropertyId);        }        // register with controller        HvacController hvacController = Dependency.get(HvacController.class);        hvacController.addHvacView(this, true);        mLastPostion = getProgress();    }    @Override    protected void onDraw(Canvas canvas) {
           canvas.rotate(-90);        canvas.translate(-getHeight(), 0);        super.onDraw(canvas);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
           super.onMeasure(widthMeasureSpec, heightMeasureSpec);        int width = getMeasuredHeight();        int height = getMeasuredWidth();        setMeasuredDimension(width, height);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
           super.onSizeChanged(h, w, oldh, oldw);    }    public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) {
           mOnSeekBarChangeListener = l;    }    private void onStartTrackingTouch() {
           if (mOnSeekBarChangeListener != null) {
               mOnSeekBarChangeListener.onStartTrackingTouch(this);        }    }    private void onStopTrackingTouch() {
           if (mOnSeekBarChangeListener != null) {
               mOnSeekBarChangeListener.onStopTrackingTouch(this);        }    }    private void onProgressChanged() {
           if (mOnSeekBarChangeListener != null) {
               int progress = getProgress();            //Log.i("tag", "yong  onProgressChanged ACTION_MOVE");            mOnSeekBarChangeListener.onProgressChanged(this, progress, false);        }    }    @SuppressLint("ClickableViewAccessibility")    @Override    public boolean onTouchEvent(MotionEvent event) {
           if (!isEnabled()) return false;        switch (event.getAction()) {
               case MotionEvent.ACTION_DOWN:                setPressed(true);                onStartTrackingTouch();                break;            case MotionEvent.ACTION_MOVE:                onProgressChanged();                int progress = getMax() - (int) (getMax() * event.getY() / getHeight());                setProgress(progress);                onSizeChanged(getWidth(), getHeight(), 0, 0);                break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                onStopTrackingTouch();                setPressed(false);                break;        }        return true;    }    @Override    public int getPropertyId() {
           return mPropertyId;    }    @Override    public int getAreaId() {
           return mAreaId;    }    @Override    public void setTemp(float temp) {
           if(DEBUG) {
               Log.i(TAG, "setTemp temp: " + temp);        }        int value =  ((int)temp) - mHvacOffset;        setProgress((int)value);    }    @Override    public float getTemp() {
           return 0;    }    public int getHvacOffset(){
           return mHvacOffset;    }}

xml中引用

这里遇到一个问题，在拖动滑块时，会再水平方向上多出一个灰色圆形小球。

android:background="@null"android:splitTrack="false"

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