本实例弹出窗口主要是继承PopupWindow类来实现的弹出窗体，布局可以根据自己定义设计。弹出效果主要使用了translate和alpha样式实现，具体实习如下：
第一步：设计弹出窗口xml:
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<?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="从相册选择" 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：创建SelectPicPopupWindow类继承PopupWindow：
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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.AnimBottom); //实例化一个ColorDrawable颜色为半透明 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; } }); }}?第三步：编写MainActivity类实现测试：
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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 { //自定义的弹出框类 SelectPicPopupWindow menuWindow; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView tv = (TextView) this.findViewById(R.id.text); //把文字控件添加监听，点击弹出自定义窗口 tv.setOnClickListener(new OnClickListener() { public void onClick(View v) { //实例化SelectPicPopupWindow menuWindow = new SelectPicPopupWindow(MainActivity.this, itemsOnClick); //显示窗口 menuWindow.showAtLocation(MainActivity.this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0); //设置layout在PopupWindow中显示的位置 } }); } //为弹出窗口实现监听类 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：运行效果如下：
