Android 自定义View 滑动解锁

自定义view来绘制一个类似滑动解锁的button，注释都在，效果如下

代码在下面，替换一下资源，可以直接使用，如果需要画的是圆角的话，需要把下面两行注释的DrawLine的注释打开，然后把两行drawRoundRect注释掉。

package com.vendingontrack.vendcoin.customView;import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;import androidx.annotation.Nullable;import com.vendingontrack.vendcoin.R;public class SlideUnlockView extends View {private Paint mPaint;//绘制背景private Paint mTextPaint;//绘制文字private Paint mSlideTextPaint;//滑动文字private Paint mSwipeBgPaint;private Bitmap mIconBitmap;private int mWidth;private int mHeight;private int mPadding;private String content = "Slide to begin";private String mSlideContent = "VendCoin";private Rect mTextRect;private float mDrawX;private boolean mCanMove;private OnUnlockListener mListener;private int mBackgroudColor;private int mTextColor;private int mIconId;private boolean unSlide;private int mFillColor;private Context mContext;private boolean isSlide;public SlideUnlockView(Context context) {this(context,null);}public SlideUnlockView(Context context, @Nullable AttributeSet attrs) {this(context, attrs,0);}public SlideUnlockView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mContext = context;initAttr(attrs);init();}private void initAttr(AttributeSet attrs){TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.SlideUnlockView);mBackgroudColor = ta.getColor(R.styleable.SlideUnlockView_backgroundColor,getResources().getColor(R.color.color_E9DDC7));mTextColor = ta.getColor(R.styleable.SlideUnlockView_textColor,getResources().getColor(R.color.clolor_091431));mIconId = ta.getResourceId(R.styleable.SlideUnlockView_icon, R.drawable.icon_thumb);
//        unSlide = ta.getBoolean(R.styleable.SlideUnlockView_unSlide,false);ta.recycle();}//设置为不可滑动public void setUnSlide(boolean unable){this.unSlide = unable;}private void init() {mTextPaint = new Paint();mTextPaint.setColor(mTextColor);mTextPaint.setAntiAlias(true);mTextPaint.setTextSize(sp2px(getContext(),16));mTextRect = new Rect();mTextPaint.getTextBounds(content,0,content.length(),mTextRect);mSlideTextPaint = new Paint();mSlideTextPaint.setColor(mContext.getResources().getColor(R.color.color_E9DDC7));mSlideTextPaint.setAntiAlias(true);mSlideTextPaint.setTextSize(sp2px(getContext(),22));
//        mTextRect = new Rect();mSlideTextPaint.getTextBounds(mSlideContent,0,mSlideContent.length(),mTextRect);mIconBitmap = BitmapFactory.decodeResource(getResources(), mIconId);mPadding  = 0;mHeight = mIconBitmap.getHeight()+mPadding*2;mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setStyle(Paint.Style.FILL);mPaint.setStrokeCap(Paint.Cap.ROUND);mPaint.setColor(mBackgroudColor);mPaint.setStrokeWidth(mHeight);mSwipeBgPaint = new Paint();mSwipeBgPaint = new Paint();mSwipeBgPaint.setAntiAlias(true);mSwipeBgPaint.setStyle(Paint.Style.FILL);mSwipeBgPaint.setStrokeCap(Paint.Cap.ROUND);mSwipeBgPaint.setColor(mContext.getResources().getColor(R.color.clolor_091431));mSwipeBgPaint.setStrokeWidth(mHeight);//默认滑动图标跟文字间的间隔int middle = dp2px(getContext(), 20);mWidth = mPadding + mHeight*2 + mTextRect.width() + middle *2;}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int wSpecMode = MeasureSpec.getMode(widthMeasureSpec);int wSpecSize = MeasureSpec.getSize(widthMeasureSpec);//如果设定的宽度比控件默认需求的大，则修改，否则就用默认宽度if (wSpecMode == MeasureSpec.EXACTLY){if (wSpecSize>mWidth){mWidth = wSpecSize;}}setMeasuredDimension(mWidth,mHeight);}public void setUnlockListener(OnUnlockListener listener){mListener = listener;}@Overrideprotected void onDraw(Canvas canvas) {if (mDrawX < mPadding ){mDrawX = mPadding;}else if (mDrawX > mWidth - mIconBitmap.getWidth()-mPadding){mDrawX = mWidth - mIconBitmap.getWidth()-mPadding;}canvas.drawRoundRect(new RectF(0, 0, mWidth, mHeight), 18, 18, mPaint);//画背景颜色，需要给圆形笔锋预留半个高度的位置
//        canvas.drawLine(mHeight/2,mHeight/2,mWidth-mHeight/2,mHeight/2,mPaint);int textX = mWidth / 2 - mTextRect.width()/2;//        canvas.drawLine(mHeight/2,mHeight/2,mDrawX+mIconBitmap.getWidth()/2,mHeight/2,mSwipeBgPaint);canvas.drawRoundRect(new RectF(0, 0, mDrawX+mIconBitmap.getWidth(), mHeight), 18, 18, mSwipeBgPaint);if(isSlide){canvas.drawText(mSlideContent, textX, mHeight / 2 + mTextRect.height() / 2, mSlideTextPaint);}else {//绘制文字到中间位置canvas.drawText(content, textX, mHeight / 2 + mTextRect.height() / 2, mTextPaint);}//根据滑动位置绘制图标canvas.drawBitmap(mIconBitmap,mDrawX,mPadding,mPaint);}@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX();switch (event.getAction()){case MotionEvent.ACTION_DOWN:isSlide = false;//如果不可滑动，立即返回if (unSlide)return false;if (x <= mIconBitmap.getWidth()+mPadding){mCanMove = true;}return true;case MotionEvent.ACTION_MOVE://如果是可移动状态才继续绘制if (mCanMove){isSlide = true;mDrawX = x;invalidate();}return true;case MotionEvent.ACTION_UP:isSlide = false;//如果是可移动状态才继续绘制if (mCanMove){reset();mCanMove = false;//判断是否在指定位置抬起手指if (mDrawX >= mWidth - mIconBitmap.getWidth()-mPadding){if (mListener!=null)mListener.onUnlock();}}break;}return super.onTouchEvent(event);}public void setmCanMove(boolean canMove){mCanMove = canMove;}//用属性动画将图标位置重置private void reset(){ObjectAnimator animator = ObjectAnimator.ofFloat(this,"mDrawX",mDrawX,mPadding);animator.setDuration(200);animator.start();}private float getMDrawX() {return mDrawX;}private void setMDrawX(float mDrawX) {this.mDrawX = mDrawX;invalidate();}public interface OnUnlockListener{void onUnlock();}/*** dp转px** @param context 上下文* @param dpValue dp值* @return px值*/public static int dp2px(Context context, float dpValue) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (dpValue * scale + 0.5f);}/*** sp转px** @param context 上下文* @param spValue sp值* @return px值*/public static int sp2px(Context context, float spValue) {final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;return (int) (spValue * fontScale + 0.5f);}}

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