PopupWindow的使用

由于一个弹出菜单非常丑，我在想办法把它弄的好看点。现在找到了一个资料，用的是PopupWindow。

  首先复写了PopupWindow类：

SelectPicPopupWindow.class

public class SelectPicPopupWindow extends PopupWindow {
private Button btn_take_photo, btn_pick_photo, btn_cancel;
private View mMenuView;

public SelectPicPopupWindow(Activity context,OnClickListener itemsOnClick) {
super(context);
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mMenuView = inflater.inflate(R.layout.alert_dialog, null);
btn_take_photo = (Button) mMenuView.findViewById(R.id.btn_take_photo);
btn_pick_photo = (Button) mMenuView.findViewById(R.id.btn_pick_photo);
btn_cancel = (Button) mMenuView.findViewById(R.id.btn_cancel);
//取消按钮
btn_cancel.setOnClickListener(new OnClickListener() {


public void onClick(View v) {
//销毁弹出框
dismiss();
}
});
//设置按钮监听
btn_pick_photo.setOnClickListener(itemsOnClick);
btn_take_photo.setOnClickListener(itemsOnClick);
//设置SelectPicPopupWindow的View
this.setContentView(mMenuView);
//设置SelectPicPopupWindow弹出窗体的宽
this.setWidth(LayoutParams.FILL_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);
//设置SelectPicPopupWindow弹出窗体动画效果
this.setAnimationStyle(R.style.take_photo_anim);
//实例化一个ColorDrawable颜色为半透明
// ColorDrawable dw = new ColorDrawable(0xb0000000);
ColorDrawable dw = new ColorDrawable(0xb0000000);
//设置SelectPicPopupWindow弹出窗体的背景
this.setBackgroundDrawable(dw);
//mMenuView添加OnTouchListener监听判断获取触屏位置如果在选择框外面则销毁弹出框
mMenuView.setOnTouchListener(new OnTouchListener() {

public boolean onTouch(View v, MotionEvent event) {

int height = mMenuView.findViewById(R.id.pop_layout).getTop();
int y=(int) event.getY();
if(event.getAction()==MotionEvent.ACTION_UP){
if(y<height){
dismiss();
}
}
return true;
}
});
}

alert_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="vertical" >


    <LinearLayout
        android:id="@+id/pop_layout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center_horizontal"
        android:orientation="vertical" >


        <Button
            android:id="@+id/btn_take_photo"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dip"
            android:layout_marginRight="20dip"
            android:layout_marginTop="20dip"
            android:text="拍照"
            android:background="@drawable/button_savephoto_style"
            android:textStyle="bold" />


        <Button
            android:id="@+id/btn_pick_photo"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dip"
            android:layout_marginRight="20dip"
            android:layout_marginTop="5dip"
            android:text="从相册选择"
            android:background="@drawable/button_savephoto_style"
            android:textStyle="bold" />


        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="15dip"
            android:layout_marginLeft="20dip"
            android:layout_marginRight="20dip"
            android:layout_marginTop="15dip"
            android:background="@drawable/button_savephoto_style"
            android:text="取消"
            android:textColor="@color/light_gray"
            android:textStyle="bold" />
    </LinearLayout>
</RelativeLayout>

动画效果：

在styles.xml里面添加：

    <style name="take_photo_anim" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/pop_enter_anim</item>
        <item name="android:windowExitAnimation">@anim/pop_exit_anim</item>
    </style>

然后是pop_enter_anim.xml和pop_exit_anim.xml两个文件，写的是具体的动画效果

pop_enter_anim.xml

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android"> 
    <translate
    android:duration="200"
    android:fromYDelta="100%p"
    android:toYDelta="0" /> 
  <alpha
    android:duration="200"
    android:fromAlpha="0.0"
    android:toAlpha="1.0" /> 
</set> 

pop_exit_anim.xml

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android"> 
  <translate
    android:duration="200"
    android:fromYDelta="0"
    android:toYDelta="50%p" /> 
  <alpha
    android:duration="200"
    android:fromAlpha="1.0"
    android:toAlpha="0.0" /> 
</set> 

最后是弹出对话框的使用：

根据ID编写按钮对应的功能：

private void showPopupMenu(View view, final int targetID) {
menuWindow = new SelectPicPopupWindow(CarCheck.this, new OnClickListener() {
@Override
public void onClick(View v) {
menuWindow.dismiss();
switch (v.getId()) {
case R.id.btn_take_photo:
imgUri = capturePhoto.dispatchTakePictureIntent(SHOT_IMAGE, targetID);
break;
case R.id.btn_pick_photo:
capturePhoto.dispatchTakePictureIntent(PICK_IMAGE, targetID);
break;
default:
break;
}
}
});
// 显示窗口
menuWindow.showAtLocation(CarCheck.this.findViewById(R.id.image_carcheck),
Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0); // 设置layout在PopupWindow中显示的位置
}