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:
Xml代码
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
>
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
>
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
/>
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
/>
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
/>
第二步：创建SelectPicPopupWindow类继承PopupWindow：
Java代码
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 dismiss(); ){>
}
}
return true;
}
});
}
}
第三步：编写MainActivity类实现测试：
Java代码
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;
}
}
};
}
