Android开发仿QQ空间根据位置弹出PopupWindow显示更多操作效果

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我们打开QQ空间的时候有个箭头按钮点击之后弹出PopupWindow会根据位置的变化显示在箭头的上方还是下方，比普通的PopupWindow弹在屏幕中间显示好看的多。

先看QQ空间效果图：

这个要实现这个效果可以分几步进行

1.第一步自定义PopupWindow，实现如图的样式，这个继承PopupWindow自定义布局很容易实现

2.得到点击按钮的位置，根据位置是否在屏幕的中间的上方还是下方，将PopupWindow显示在控件的上方或者下方

3.适配问题，因为PopupWindow上面的操作列表是动态的所以要自定义listView

4.动画效果+背景变暗

通过步骤分析，我们就很清晰的了解我们要做什么，话不多说，从第一步开始吧

下面自定义PopupWindow实现效果

1.重写listView，重新计算高度（一般也应用于解决ScrollView嵌套listView只显示一行的问题）

public class MyListView extends ListView {
  public MyListView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  public MyListView(Context context) {
    super(context);
  }
  public MyListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }
  @Override
  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
        MeasureSpec.AT_MOST));
  }
}

2.自定义PopupWindow的布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:gravity="right">
  <ImageView
    android:id="@+id/arrow_up"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="28dp"
    android:src="@drawable/arrow_up_white"
    android:visibility="visible"/>
  <com.widget.MyListView
    android:id="@+id/lv_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="@dimen/normal_margin8"
    android:layout_marginTop="-1dp"
    android:layout_marginBottom="-1dp"
    android:dividerHeight="0dp"
    android:layout_marginLeft="@dimen/normal_margin8"
    android:layout_marginRight="@dimen/normal_margin8"
    android:scrollbars="none"
    android:background="@drawable/custom_white"
    android:divider="@null"></com.widget.MyListView>
  <ImageView
    android:id="@+id/arrow_down"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="28dp"
    android:src="@drawable/arrow_down_white"
    android:visibility="visible"/>
</LinearLayout>

2.PopupWindow弹出动画以及消失动画

popshow_operation_anim_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <scale android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fromXScale="0.0"
    android:toXScale="1.0"
    android:fromYScale="0.0"
    android:toYScale="1.0"
    android:pivotX="90%"
    android:pivotY="0%"
    android:fillAfter="false"
    android:duration="300" >
  </scale>
</set>

popshow_operation_anim_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <scale android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fromXScale="0.0"
    android:toXScale="1.0"
    android:fromYScale="0.0"
    android:toYScale="1.0"
    android:pivotX="90%"
    android:pivotY="100%"
    android:fillAfter="false"
    android:duration="250" >
  </scale>
</set>

消失动画是渐隐动画可以自己定义，同理。

3.重写PopupWindow了

public class CustomOperationPopWindow extends PopupWindow {
  private Context context;
  private View conentView;
  private View backgroundView;
  private Animation anim_backgroundView;
  private MyListView listView;
  private TypeSelectPopuAdapter selectAdapter;
  ImageView arrow_up, arrow_down;
  List<TypeSelect> typeSelectlist = new ArrayList<>();
  int[] location = new int[2];
  private OnItemListener onItemListener;
  private AdapterView.OnItemClickListener onItemClickListener;
  public interface OnItemListener {
    public void OnItemListener(int position, TypeSelect typeSelect);
  }
  ;
  public void setOnItemMyListener(OnItemListener onItemListener) {
    this.onItemListener = onItemListener;
  }
  public CustomOperationPopWindow(Context context) {
    this.context = context;
    initView();
  }
  public CustomOperationPopWindow(Context context, List<TypeSelect> typeSelectlist) {
    this.context = context;
    this.typeSelectlist = typeSelectlist;
    initView();
  }
  private void initView() {
    this.anim_backgroundView = AnimationUtils.loadAnimation(context, R.anim.alpha_show_anim);
    LayoutInflater inflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.conentView = inflater.inflate(R.layout.view_operation_popupwindow, null);
    // 设置SelectPicPopupWindow的View
    this.setContentView(conentView);
    // 设置SelectPicPopupWindow弹出窗体的宽
    this.setWidth(LayoutParams.MATCH_PARENT);
    // 设置SelectPicPopupWindow弹出窗体的高
    this.setHeight(LayoutParams.WRAP_CONTENT);
    // 设置SelectPicPopupWindow弹出窗体可点击
    this.setFocusable(true);
    this.setOutsideTouchable(true);
    // 刷新状态
    this.update();
    // 实例化一个ColorDrawable颜色为半透明
    ColorDrawable dw = new ColorDrawable(0000000000);
    // 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener ，设置其他控件变化等操作
    this.setBackgroundDrawable(dw);
    // 设置SelectPicPopupWindow弹出窗体动画效果
    this.setAnimationStyle(R.style.operation_popwindow_anim_style_up);
    this.listView = (MyListView) conentView.findViewById(R.id.lv_list);
    this.arrow_up = (ImageView) conentView.findViewById(R.id.arrow_up);
    this.arrow_down = (ImageView) conentView.findViewById(R.id.arrow_down);
    //设置适配器
    this.selectAdapter = new TypeSelectPopuAdapter(context, typeSelectlist,
        R.layout.item_operation_popu);
    this.listView.setAdapter(selectAdapter);
    this.listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (isShowing()) {
          dismiss();
        }
        onItemListener.OnItemListener(position, typeSelectlist.get(position));
      }
    });
    this.setOnDismissListener(new OnDismissListener() {
      @Override
      public void onDismiss() {
        if (backgroundView != null) {
          backgroundView.setVisibility(View.GONE);
        }
      }
    });
  }
  //设置数据
  public void setDataSource(List<TypeSelect> typeSelectlist) {
    this.typeSelectlist = typeSelectlist;
    this.selectAdapter.notifyDataSetChanged();
  }
  /**
   * 没有半透明背景 显示popupWindow
   *
   * @param
   */
  public void showPopupWindow(View v) {
    v.getLocationOnScreen(location); //获取控件的位置坐标
    //获取自身的长宽高
    conentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
    if (location[1] > MainApplication.SCREEN_H / 2 + 100) { //MainApplication.SCREEN_H 为屏幕的高度，方法可以自己写
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_up);
      arrow_up.setVisibility(View.GONE);
      arrow_down.setVisibility(View.VISIBLE);
      this.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]), location[1] - conentView.getMeasuredHeight());
    } else {
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_down);
      arrow_up.setVisibility(View.VISIBLE);
      arrow_down.setVisibility(View.GONE);
      this.showAsDropDown(v, 0, 0);
    }
  }
  /**
   * 携带半透明背景 显示popupWindow
   *
   * @param
   */
  public void showPopupWindow(View v, View backgroundView) {
    this.backgroundView = backgroundView;
    v.getLocationOnScreen(location); //获取控件的位置坐标
    //获取自身的长宽高
    conentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
    backgroundView.setVisibility(View.VISIBLE);
    //对view执行动画
    backgroundView.startAnimation(anim_backgroundView);
    if (location[1] > MainApplication.SCREEN_H / 2 + 100) { //若是控件的y轴位置大于屏幕高度的一半，向上弹出
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_up);
      arrow_up.setVisibility(View.GONE);
      arrow_down.setVisibility(View.VISIBLE);
      this.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]), location[1] - conentView.getMeasuredHeight()); //显示指定控件的上方
    } else {
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_down); //反之向下弹出
      arrow_up.setVisibility(View.VISIBLE);
      arrow_down.setVisibility(View.GONE);
      this.showAsDropDown(v, 0, 0);  //显示指定控件的下方
    }
  }
  /**
   * 显示popupWindow 根据特殊要求高度显示位置 
   *
   * @param
   */
  public void showPopupWindow(View v, View backgroundView,int hight) {
    this.backgroundView = backgroundView;
    v.getLocationOnScreen(location);
    //获取自身的长宽高
    conentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
    backgroundView.setVisibility(View.VISIBLE);
    //对view执行动画
    backgroundView.startAnimation(anim_backgroundView);
    if (location[1] > MainApplication.SCREEN_H / 2 + 100) {
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_up);
      arrow_up.setVisibility(View.GONE);
      arrow_down.setVisibility(View.VISIBLE);
      this.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]), location[1] - conentView.getMeasuredHeight()-hight);
    } else {
      this.setAnimationStyle(R.style.operation_popwindow_anim_style_down);
      arrow_up.setVisibility(View.VISIBLE);
      arrow_down.setVisibility(View.GONE);
      this.showAsDropDown(v, 0, 0);
    }
  }
}

4.代码中的用法

CustomOperationPopWindow customOperationPopWindow = new CustomOperationPopWindow(this, operationTypeSelectlist);
customOperationPopWindow.setOnItemMyListener(new CustomOperationPopWindow.OnItemListener() {
  @Override
  public void OnItemListener(int position, TypeSelect typeSelect) {
    //此处实现列表点击所要进行的操作
  }
});

textView.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
customOperationPopWindow.showPopupWindow(textView);//可以传个半透明view v_background过去根据业务需要显示隐藏
  }
});

5.最终实际效果