0.效果图
1.设置Activity样式属性
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<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"> <item name="android:windowIsTranslucent">true</item></style> |
2.自定义侧边阴影视图
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class SlideBackView extends View { private Paint mBgPaint, mShadowPaint; private RectF mBgRectF, mShadowRectF; private float mRatio; private float mShadowSize; public SlideBackView(Context context) { super(context); mBgPaint = new Paint(); mBgPaint.setAntiAlias(true); mBgPaint.setColor(0xff000000); mShadowPaint = new Paint(); mShadowPaint.setAntiAlias(true); mShadowPaint.setStyle(Paint.Style.FILL); mShadowSize = dp2px(15); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mBgRectF = new RectF(); mBgRectF.top = 0; mBgRectF.left = 0; mBgRectF.bottom = MeasureSpec.getSize(heightMeasureSpec); mShadowRectF = new RectF(); mShadowRectF.top = 0; mShadowRectF.bottom = MeasureSpec.getSize(heightMeasureSpec); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int width = getMeasuredWidth(); float right = mRatio * width; mBgRectF.right = right; mBgPaint.setAlpha((int) (128 * (1 - mRatio))); canvas.drawRect(mBgRectF, mBgPaint); mShadowRectF.left = right - mShadowSize; mShadowRectF.right = right; mShadowPaint.setShader(new LinearGradient(mShadowRectF.left, 0, mShadowRectF.right, 0, 0x00000000, 0x26000000, Shader.TileMode.CLAMP)); canvas.drawRect(mShadowRectF, mShadowPaint); } public void setDistance(float ratio) { mRatio = ratio; invalidate(); } private float dp2px(float dpValue) { float density = getResources().getDisplayMetrics().density; return dpValue * density + 0.5F; } } |
3.定义可滑动的Activity父类
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public class SlideBaseActivity extends AppCompatActivity implements ValueAnimator.AnimatorUpdateListener { private boolean isAnimate, isSlide, isHandle; private float moveNum; private float lastX, lastY; private int lastPointerCount; private float mAnimatedValue; private ValueAnimator mValueAnimator; private SlideBackView mSlideBackView; private float mTouchSlop; private List<ShieldView> shieldViews = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); super.onCreate(savedInstanceState); initAnimator(); initSlideBackView(); mTouchSlop = ViewConfiguration.get(this).getScaledTouchSlop(); } @Override public void onAnimationUpdate(ValueAnimator animation) { mAnimatedValue = (float) animation.getAnimatedValue(); moveView(mAnimatedValue); } @Override public boolean dispatchTouchEvent(MotionEvent event) { if (!isAnimate) { float x = event.getRawX(); float y = event.getRawY(); if (event.getPointerCount() != lastPointerCount) { lastPointerCount = event.getPointerCount(); lastX = x; lastY = y; } float offsetX, offsetY; switch (event.getAction()) { case MotionEvent.ACTION_MOVE: offsetX = x - lastX; offsetY = y - lastY; if (!isHandle) { float absX = Math.abs(offsetX); float absY = Math.abs(offsetY); if (absX > mTouchSlop) { if (absX * 0.5f > absY) { isSlide = true; checkSlide((int) x, (int) y); } else { isSlide = false; } isHandle = true; } } else if (isSlide) { moveNum += offsetX; if (moveNum < 0) { moveNum = 0; } moveView(moveNum); lastX = event.getX(); } break; case MotionEvent.ACTION_UP: if (isHandle) { isSlide = false; isHandle = false; isAnimate = true; int width = getWindow().getDecorView().getMeasuredWidth(); if (moveNum < width / 3f) { mValueAnimator.setFloatValues(moveNum, 0); } else { mValueAnimator.setFloatValues(moveNum, width); } mValueAnimator.start(); moveNum = 0; lastPointerCount = 0; } } } return isSlide || super.dispatchTouchEvent(event); } /** * 添加禁用滑动的子布局 */ public void addShieldView(View view) { shieldViews.add(new ShieldView(false, view)); } /** * 添加水平禁用滑动的子布局 */ public void addHorizontalShieldView(View view) { shieldViews.add(new ShieldView(true, view)); } /** * 移除禁用滑动的子布局 */ public void removeShieldView(View view) { for (ShieldView v : shieldViews) { if (v.view != null && v.view.equals(view)) { shieldViews.remove(v); break; } } } /** * 清空禁用滑动的子布局 */ public void clearShieldView() { shieldViews.clear(); } private void initAnimator() { mValueAnimator = new ValueAnimator(); mValueAnimator.setDuration(300); mValueAnimator.addUpdateListener(this); mValueAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { isAnimate = false; if (mAnimatedValue == getWindow().getDecorView().getMeasuredWidth()) { SlideBaseActivity.super.finish(); overridePendingTransition(0, 0); } } }); } private void initSlideBackView() { mSlideBackView = new SlideBackView(this); ViewGroup decorView = (ViewGroup) getWindow().getDecorView(); decorView.addView(mSlideBackView); } private void moveView(float moveX) { ViewGroup decorView = (ViewGroup) getWindow().getDecorView(); mSlideBackView.setDistance(moveX / decorView.getMeasuredWidth()); int count = decorView.getChildCount(); for (int i = 0; i < count; i++) { View view = decorView.getChildAt(i); if (view != mSlideBackView) { view.setX(moveX); } } } private void checkSlide(int x, int y) { for (ShieldView v : shieldViews) { Rect rect = new Rect(); v.view.getGlobalVisibleRect(rect); if (rect.contains(x, y) && (!(lastX < x && !v.view.canScrollHorizontally(-1)) || (!v.isHorizontal))) { isSlide = false; } } } class ShieldView { boolean isHorizontal; View view; public ShieldView(boolean isHorizontal, View view) { this.isHorizontal = isHorizontal; this.view = view; } }} |
4.使用
继承SlideBaseActivity类,可调用addShieldView或addHorizontalShieldView方法解决事件冲突。
5.项目源码
https://gitee.com/yugu/slide-demo
总结
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原文链接：https://segmentfault.com/a/1190000022678714
