Android用PopupWindow實現從底部滑出選擇菜單

在開發中PopupWindow的彈出效果是必不可少的。許多應用的App都喜歡用到PopupWindow。如：新浪微博客戶端、微信客戶端、大眾點評客戶端等等。今天給大家

介紹的是微信客戶端里用PopupWindow實現的一種從底部滑出選擇菜單的效果。

本實例彈出窗口主要是繼承PopupWindow類來實現的彈出窗體，布局可以根據自己定義設計。彈出效果主要使用了translate和alpha樣式實現，具體實例如下：

第一步：設計彈出窗口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:gravity="center_horizontal"
    android:orientation="vertical"
    android:layout_alignParentBottom="true"
     android:background="@drawable/btn_style_alert_dialog_background"
     >


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

    <Button
        android:id="@+id/btn_pick_photo"
        android:layout_marginLeft="20dip"
        android:layout_marginRight="20dip"
        android:layout_marginTop="5dip"
         android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="從相冊選擇"
         android:background="@drawable/btn_style_alert_dialog_button"
         android:textStyle="bold"
         />

    <Button
        android:id="@+id/btn_cancel"
       android:layout_marginLeft="20dip"
       android:layout_marginRight="20dip"
       android:layout_marginTop="15dip"
       android:layout_marginBottom="15dip"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="取消"
       android:background="@drawable/btn_style_alert_dialog_cancel"
       android:textColor="#ffffff"
       android:textStyle="bold"

        />
</LinearLayout>
</RelativeLayout>

 第二步：創建SelectPicPopupWindow類繼承PopupWindow：

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.PopupWindow;

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);
        //取消按鈕
        btn_cancel.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                //銷毀彈出框
                dismiss();
            }
        });
        //設置按鈕監聽
        btn_pick_photo.setOnClickListener(itemsOnClick);
        btn_take_photo.setOnClickListener(itemsOnClick);
        //設置SelectPicPopupWindow的View
        this.setContentView(mMenuView);
        //設置SelectPicPopupWindow彈出窗體的寬
        this.setWidth(LayoutParams.FILL_PARENT);
        //設置SelectPicPopupWindow彈出窗體的高
        this.setHeight(LayoutParams.WRAP_CONTENT);
        //設置SelectPicPopupWindow彈出窗體可點擊
        this.setFocusable(true);
        //設置SelectPicPopupWindow彈出窗體動畫效果
        this.setAnimationStyle(R.style.AnimBottom);
        //實例化一個ColorDrawable顏色為半透明
        ColorDrawable dw = new ColorDrawable(0xb0000000);
        //設置SelectPicPopupWindow彈出窗體的背景
        this.setBackgroundDrawable(dw);
        //mMenuView添加OnTouchListener監聽判斷獲取觸屏位置如果在選擇框外面則銷毀彈出框
        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;
            }
        });

    }

}

第三步：編寫MainActivity類實現測試：

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

public class MainActivity extends Activity {

    //自定義的彈出框類
    SelectPicPopupWindow menuWindow;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView tv = (TextView) this.findViewById(R.id.text);
        //把文字控件添加監聽，點擊彈出自定義窗口
        tv.setOnClickListener(new OnClickListener() {           
            public void onClick(View v) {
                //實例化SelectPicPopupWindow
                menuWindow = new SelectPicPopupWindow(MainActivity.this, itemsOnClick);
                //顯示窗口
                menuWindow.showAtLocation(MainActivity.this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0); //設置layout在PopupWindow中顯示的位置
            }
        });
    }

    //為彈出窗口實現監聽類
    private OnClickListener  itemsOnClick = new OnClickListener(){

        public void onClick(View v) {
            menuWindow.dismiss();
            switch (v.getId()) {
            case R.id.btn_take_photo:
                break;
            case R.id.btn_pick_photo:               
                break;
            default:
                break;
            }


        }

    };

}

第四：運行效果如下：