Android怎么实现仿网易严选底部弹出菜单效果

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首先展示效果图如下：

是不是还可以呢，由于代码量不多却注释详细，所以先贴出代码再一一详说:

BottomPopupWindowView类：

 public class BottomPopupWindowView extends LinearLayout{  private AnimatorListener animatorListener;  //底部内容的View  private FrameLayout base_view;  //内容的View  private FrameLayout content_view;  //背景的View  private RelativeLayout popup_bg;  //xml加载的View  private View bottomPopouView;  //外部加载的内容View  private View contentView;  //外部加载的底部内容View  private View baseView;  //手势的最小值  private float minVelocity=0;  //加载一次的判断值  private boolean mDrawable=true;  public void setAnimatorListener(AnimatorListener animatorListener) {    this.animatorListener = animatorListener;  }  public void setBaseView(View baseView){    this.baseView=baseView;  }  public void setContextView(View view){    this.contentView=view;  }  public void setContentView(int id){    this.contentView=LayoutInflater.from(getContext()).inflate(id,null);  }  public BottomPopupWindowView(Context context) {    this(context,null);  }  public BottomPopupWindowView(Context context, @Nullable AttributeSet attrs) {    this(context,attrs,0);  }  public BottomPopupWindowView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    //初始化各种数值    minVelocity=ViewConfiguration.get(getContext()).getScaledTouchSlop();    bottomPopouView= LayoutInflater.from(getContext()).inflate(R.layout.layout_bottom_popup,null);    base_view=(FrameLayout)bottomPopouView.findViewById(R.id.bottom_view);    content_view=(FrameLayout)bottomPopouView.findViewById(R.id.content_view);    popup_bg=(RelativeLayout)bottomPopouView.findViewById(R.id.popup_bg);    //把整个View都加载在LinearLayout里以显示出来    addView(bottomPopouView);    //背景颜色监听    popup_bg.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        disMissPopupView();      }    });    //屏蔽内容区域点击事件    content_view.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View view){}    });    //屏蔽底部内容区域点击事件    base_view.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View view){}    });    //内容区域判断是否向下，手势向下就关闭弹框    content_view.setOnTouchListener(new OnTouchListener() {      @Override      public boolean onTouch(View view, MotionEvent motionEvent) {        float y1=0,y2=0;        if(motionEvent.getAction() == MotionEvent.ACTION_DOWN) {          y1 = motionEvent.getY();        }        if(motionEvent.getAction() == MotionEvent.ACTION_UP){          y2 = motionEvent.getY();          if((y2-y1)>minVelocity){            disMissPopupView();          }        }        return false;      }    });  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    if(mDrawable&&baseView!=null){      //刚开始加载底部内容区域，只需一次就行，多次报错      base_view.addView(baseView);      mDrawable=false;    }  }  public void showPopouView(){    if(contentView!=null){      //开始动画数据      startAnimation();      //开启背景颜色的渐变动画      popup_bg.setVisibility(View.VISIBLE);      popup_bg.setAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.bp_bottom_bg_in));      //把这个区域全部显示出来      ((BottomPopupWindowView)this).setLayoutParams(new RelativeLayout.LayoutParams(          RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT));      //假如内容区域      content_view.addView(contentView,0);      content_view.setVisibility(View.VISIBLE);      //开启内容区域动画      content_view.setAnimation(AnimationUtils.loadAnimation(getContext(),R.anim.bp_bottom_view_in));    }  }  public void disMissPopupView(){    //开始关闭动画数据    endAnimation();    //开启内容区域动画    content_view.setVisibility(View.GONE);    Animation animation=AnimationUtils.loadAnimation(getContext(),R.anim.bp_bottom_view_out);    animation.setAnimationListener(new Animation.AnimationListener() {      @Override      public void onAnimationStart(Animation animation) {}      @Override      public void onAnimationRepeat(Animation animation) {}      @Override      public void onAnimationEnd(Animation animation) {        //等内容区域动画结束后，清楚所有View        content_view.removeAllViews();        //开启背景颜色的渐变动画        popup_bg.setVisibility(View.GONE);        popup_bg.setAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.bp_bottom_bg_out));        //把整个控件的大小恢复到底部View区域的大小        RelativeLayout.LayoutParams layoutParams=new RelativeLayout.LayoutParams(            RelativeLayout.LayoutParams.MATCH_PARENT,getViewHeight((BottomPopupWindowView)BottomPopupWindowView.this));        layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM,-1);        ((BottomPopupWindowView)BottomPopupWindowView.this).setLayoutParams(layoutParams);      }    });    //开始动画    content_view.setAnimation(animation);  }  //获取View的高度  public int getViewHeight(View view){    int width =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);    int height =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);    view.measure(width,height);    return view.getMeasuredHeight();  }  //开始动画数据变化  public void startAnimation(){    ValueAnimator valueAnimator = ValueAnimator.ofInt(0,40);    valueAnimator.setDuration(250);    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {      @Override      public void onAnimationUpdate(ValueAnimator valueAnimator) {        if(animatorListener!=null){          animatorListener.startValue((int) valueAnimator.getAnimatedValue());        }      }    });    valueAnimator.start();  }  //结束动画数值变化  public void endAnimation() {    ValueAnimator valueAnimator = ValueAnimator.ofInt(40,0);    valueAnimator.setDuration(250);    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {      @Override      public void onAnimationUpdate(ValueAnimator valueAnimator) {        if(animatorListener!=null){          animatorListener.endValue((int) valueAnimator.getAnimatedValue());        }      }    });    valueAnimator.start();  }}

对应的加载的xml布局是：
layout_bottom_popou.xml如下：

1.在BottomPopupWindowView是继承LinearLayout，而layout_bottom_popou.xml是这整个BottomPopupWindowView里的骨架，然后在BottomPopupWindowView初始化的时候通过addView()来加载整个骨架布局。在onDraw()里只需加载一次baseView就可以了，不然后重复加载导致报错。这样就初始化成功了，刚开始只会加载baseView的界面，就相当于严选最下面的购物车立即购买等界面。

2.当调用showPopouView()时显示菜单的。startAnimation()方法只是为了产生动画的数据。

popup_bg.setVisibility(View.VISIBLE);popup_bg.setAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.bp_bottom_bg_in));

只是为了开启背景渐变的动画没什么说的。最重要的是显示菜单实现是把BottomPopupWindowView的大小扩展到全屏，所以设置((BottomPopupWindowView)this).setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT));,然后把弹出菜单的View即contentView装进content_view即可，然后开启弹出动画就实现了。

3.最后是disMissPopupView()方法关闭弹窗。endAnimation()方法只是为了产生动画的数据。再启动内容域View即content_View的退出动画，在动画结束后用content_view.removeAllViews();
起初菜单内容，再像上面一样开启背景颜色渐变动画，最后只需使BottomPopupWindowView恢复原来的baseView的大小及可以了，具体如下:

RelativeLayout.LayoutParams layoutParams=new RelativeLayout.LayoutParams(     RelativeLayout.LayoutParams.MATCH_PARENT,getViewHeight((BottomPopupWindowView)BottomPopupWindowView.this));        layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM,-1);        ((BottomPopupWindowView)BottomPopupWindowView.this).setLayoutParams(layoutParams);

这就是核心的代码功能了，代码量不多具体细节看上面的源码。

有人或许会问返回动画的数据有什么用，很简单就是为了实现严选菜单框出来时整个上面详情的缩放。具体看如下demo,首先给出界面xml,如下:

这就是上面效果图的界面布局，没什么可以说的，再看事例代码如下：

public class MainActivity extends AppCompatActivity implements View.OnClickListener, AnimatorListener {  private BottomPopupWindowView bottomPopupWindowView;  private View contentView;  private View bottomView;  private LinearLayout mainView;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    mainView=(LinearLayout)findViewById(R.id.main_view);    bottomView=LayoutInflater.from(this).inflate(R.layout.layout_bottom_view,null);    (bottomView.findViewById(R.id.promptly_buy)).setOnClickListener(this);    (findViewById(R.id.guige)).setOnClickListener(this);    bottomPopupWindowView=(BottomPopupWindowView)findViewById(R.id.bottom_popup);    bottomPopupWindowView.setOnClickListener(this);    bottomPopupWindowView.setBaseView(bottomView);    contentView=LayoutInflater.from(this).inflate(R.layout.layout_content_view,null);    bottomPopupWindowView.setContextView(contentView);    (contentView.findViewById(R.id.ic_cancel)).setOnClickListener(this);    bottomPopupWindowView.setAnimatorListener(this);  }  @Override  public void onClick(View view) {    switch(view.getId()){      case R.id.promptly_buy:      case R.id.ic_cancel:        bottomPopupWindowView.disMissPopupView();        break;      case R.id.guige:        bottomPopupWindowView.showPopouView();        break;    }  }  @Override  public void startValue(int value) {    setMargins (mainView,value-10,value,value-10,value);  }  @Override  public void endValue(int value) {    setMargins (mainView,value,value,value,value);  }  public static void setMargins (View v, int l, int t, int r, int b) {    if (v.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {      ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) v.getLayoutParams();      p.setMargins(l, t, r, b);      v.requestLayout();    }  }}

其中设置内容菜单的View
BottomPopupWindowView.setContextView(bottomView);
设置没有显示菜单时候显示的View(注:bottomView的高度要和BottomPopupWindowView的高度一样，具体看demo)
BottomPopupWindowView.setBaseView(bottomView);

而回调的public void startValue(int value)和public void endValue(int value)设置动画监听放回的数据，以便根据数据实现动画，严选的弹出和显示商品详情动画很简单就是不断设设置View的间距就可以了。

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