Android之PopupWindow弹出对话框

Android的对话框常用的有两种：PopupWindow和AlertDialog。PopupWindow顾名思义为弹出菜单，不同于AlertDialog对话框，PopupWindow弹出的位置可以很多变化，按照有无偏移分，可以分为无偏移和偏移两种；按照参照类型不同又可以分为两种：相对某个控件（Anchor锚）的位置和父容器内部的相对位置。具体如下：

函数	简介
showAsDropDown(View anchor)	相对某个控件的位置（正左下方），无偏移
showAsDropDown(View anchor, int xoff, int yoff)	相对某个控件的位置，有偏移
showAtLocation(View parent, int gravity, int x, int y)	父容器容器相对位置，例如正中央Gravity.CENTER，下方Gravity.BOTTOM等

下面是运行程序截图：

程序代码：

布局：main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/tv_showText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:text="@string/hello" android:textSize="22px" /> <Button android:id="@+id/bt_PopupWindow1" android:text="以自己为Anchor，不偏移" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/bt_PopupWindow2" android:text="以自己为Anchor，正下方" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/bt_PopupWindow3" android:text="以屏幕中心为参照，不偏移（正中间）" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/bt_PopupWindow4" android:text="以屏幕下方为参照，下方中间" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>

自定义对话框dialog.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/tv_tip" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="请输入内容：" /> <EditText android:id="@+id/et_text" android:layout_width="fill_parent" android:layout_height="wrap_content" ></EditText> <LinearLayout android:gravity="center_horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/bt_ok" android:text="确定" android:layout_width="100px" android:layout_height="50px" /> <Button android:id="@+id/bt_cancle" android:text="取消" android:layout_width="100px" android:layout_height="50px" /> </LinearLayout> </LinearLayout>

代码：

package com.myandroid.test; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.EditText; import android.widget.Gallery; import android.widget.PopupWindow; import android.widget.TextView; public class PopupWindowTest extends Activity {//PopupWindow属于不阻塞的对话框，AlertDialog则是阻塞的。 private Button bt_popupWindow1; private Button bt_popupWindow2; private Button bt_popupWindow3; private Button bt_popupWindow4; private TextView tv_showText; private PopupWindow popupWindow; private int screenWidth; private int screenHeight; private int dialgoWidth; private int dialgoheight; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initView(); } /** * 初始化控件和响应事件 */ private void initView() { bt_popupWindow1 = (Button)findViewById(R.id.bt_PopupWindow1); bt_popupWindow2 = (Button)findViewById(R.id.bt_PopupWindow2); bt_popupWindow3 = (Button)findViewById(R.id.bt_PopupWindow3); bt_popupWindow4 = (Button)findViewById(R.id.bt_PopupWindow4); tv_showText = (TextView)findViewById(R.id.tv_showText); bt_popupWindow1.setOnClickListener(new ClickEvent()); bt_popupWindow2.setOnClickListener(new ClickEvent()); bt_popupWindow3.setOnClickListener(new ClickEvent()); bt_popupWindow4.setOnClickListener(new ClickEvent()); } /** * 按钮点击事件处理 * @author Kobi * */ private class ClickEvent implements OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub switch(v.getId()) { case R.id.bt_PopupWindow1: //以自己为Anchor，不偏移 getPopupWindow(); popupWindow.showAsDropDown(v); break; case R.id.bt_PopupWindow2: //以自己为Anchor，偏移(screenWidth-dialgoWidth)/2, 0)--按钮正下方 getPopupWindow(); popupWindow.showAsDropDown(v, (screenWidth-dialgoWidth)/2, 0); break; case R.id.bt_PopupWindow3: //以屏幕中心为参照，不偏移 getPopupWindow(); popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.CENTER, 0, 0); break; case R.id.bt_PopupWindow4: //以屏幕左下角为参照，偏移(screenWidth-dialgoWidth)/2, 0) --屏幕下方中央 getPopupWindow(); popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM, 0, 0); break; default: break; } } } /** * 创建PopupWindow */ protected void initPopuptWindow() { // TODO Auto-generated method stub View popupWindow_view = getLayoutInflater().inflate( //获取自定义布局文件dialog.xml的视图 R.layout.dialog, null,false); popupWindow = new PopupWindow(popupWindow_view, 200, 150, true);//创建PopupWindow实例 Button bt_ok = (Button)popupWindow_view.findViewById(R.id.bt_ok); //dialog.xml视图里面的控件 Button bt_cancle = (Button)popupWindow_view.findViewById(R.id.bt_cancle); final EditText et_text = (EditText)popupWindow_view.findViewById(R.id.et_text); bt_ok.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub tv_showText.setText(et_text.getText()); //在标签里显示内容 popupWindow.dismiss(); //对话框消失 } }); bt_cancle.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub popupWindow.dismiss(); } }); //获取屏幕和对话框各自高宽 screenWidth = PopupWindowTest.this.getWindowManager().getDefaultDisplay().getWidth(); screenHeight = PopupWindowTest.this.getWindowManager().getDefaultDisplay().getHeight(); dialgoWidth = popupWindow.getWidth(); dialgoheight = popupWindow.getHeight(); } /* * 获取PopupWindow实例 */ private void getPopupWindow() { if(null != popupWindow) { popupWindow.dismiss(); return; }else { initPopuptWindow(); } } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.e("ActivityState", "onPause"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.e("ActivityState", "onResume"); } }

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