Android對話框（四）PopupWindow

主布局

package com.example.popupwindow;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.PopupWindow;

public class MainActivity extends Activity {

	private PopupWindow popupWindow;
	private View parent;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		/*
		 * 得到布局填充符getLayoutInflater()，也可通過系統服務getSystemService(name)得到
		 * inflate指定布局文件的id
		 */
		View contentView = getLayoutInflater().inflate(R.layout.popup_window, null);
		/*
		 * 第一個參數:PopupWindow要顯示的界面
		 * 第二個參數:PopupWindow的寬
		 * 第三個參數:PopupWindow的高
		 */
		popupWindow = 
				new PopupWindow(contentView, ViewGroup.LayoutParams.MATCH_PARENT,
						ViewGroup.LayoutParams.WRAP_CONTENT);
		popupWindow.setFocusable(true);
		//讓小窗口取得焦點，不然怎麼點也不會有反應
		popupWindow.setBackgroundDrawable(new BitmapDrawable());
        //點空白處關掉Popup窗口，在背景new一個位圖對象就可以了
		parent = this.findViewById(R.id.main);
		//以上main為當前Activity對應的布局文件
	}
	public void openPopupWindow(View v){
         //顯示PopupWindow的方法要多個，可設置具體顯示位置方式
		popupWindow.showAtLocation(parent, Gravity.BOTTOM, 0, 0);
	}
}

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