android PopupWindow简单例子

在android中弹出框有两种方式：AlertDialog和PopupWindow，它们的不同点在于：
1、AlertDialog的位置固定，而PopupWindow的位置可以随意；
2、AlertDialog是非阻塞线程的，而PopupWindow是阻塞线程的；

先来看看PopupWindow的效果：

下面来看个简单的例子：
popup_activity.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="45dp"        android:background="@drawable/headbg"        android:gravity="center_vertical" >        <ImageView            android:id="@+id/imgBack"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:src="@drawable/back" />        <ImageView            android:id="@+id/imgDownload"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:src="@drawable/download" />    </RelativeLayout></LinearLayout>

TestActivity.java

public class TestActivity extends Activity{    private ImageView imgBack;    private ImageView imgDownload;    private PopupWindow popupWindow;    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.popup_activity);        imgDownload = (ImageView) findViewById(R.id.imgDownload);        imgDownload.setOnClickListener(new OnClickListener()        {            @Override            public void onClick(View v)            {                showPopupWindow(-126, 24);            }        });        imgBack = (ImageView) findViewById(R.id.imgBack);        imgBack.setOnClickListener(new OnClickListener()        {            @Override            public void onClick(View v)            {                showAlertDialog();            }        });    }    private void showPopupWindow(int xoff, int yoff)    {        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, new String[] { "下载", "上传" });        ListView listview = new ListView(this);        listview.setAdapter(adapter);        popupWindow = new PopupWindow(this);        popupWindow.setHeight(190);        popupWindow.setWidth(180);        popupWindow.setBackgroundDrawable(new ColorDrawable(Color.argb(50, 52, 53, 55)));        popupWindow.setOutsideTouchable(true);        popupWindow.setFocusable(true);        popupWindow.setContentView(listview);        popupWindow.showAsDropDown(imgDownload, xoff, yoff);        if (thread != null && !thread.isAlive())        {            thread.start();        }    }    Thread thread = new Thread()    {        public void run()        {            while (true)            {                try                {                    Thread.sleep(1000);                } catch (InterruptedException e)                {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                Log.e("", "AAAAA");            }        };    };    private void showAlertDialog()    {        AlertDialog dial = new AlertDialog.Builder(this).setTitle("测试").show();        if (thread != null && !thread.isAlive())        {            thread.start();        }    }}

简单例子就是这样，至于其中的第二点说到“AlertDialog是非阻塞线程的，而PopupWindow是阻塞线程的”，还不知道是什么意思,测试了下，发现没什么区别，希望知道的同学在这告诉一下

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