仿QQ空间根据位置弹出PopupWindow显示更多操作效果，popupwindow

仿QQ空间根据位置弹出PopupWindow显示更多操作效果，popupwindow

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.s