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轉載自 http://www.cnblogs.com/sw926/p/3230659.html
PopupWindow是Android上自訂快顯視窗,使用起來很方便。
PopupWindow的建構函式為
public PopupWindow(View contentView, int width, int height, boolean focusable)
contentView為要顯示的view,width和height為寬和高,值為像素值,也可以是MATCHT_PARENT和WRAP_CONTENT。
focusable為是否可以獲得焦點,這是一個很重要的參數,也可以通過
public void setFocusable(boolean focusable)
來設定,如果focusable為false,在一個Activity彈出一個PopupWindow,按返回鍵,由於PopupWindow沒有焦點,會直接退出Activity。如果focusable為true,PopupWindow彈出後,所有的觸屏和物理按鍵都有PopupWindows處理。
如果PopupWindow中有Editor的話,focusable要為true。
下面實現一個簡單的PopupWindow
主介面的layout為:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/layout_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/btn_test_popupwindow" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="@string/app_name" /></RelativeLayout>
PopupWindow的layout為:
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#000000" > <TextView android:layout_width="wrap_content" android:layout_height="80dp" android:text="@string/app_name" android:textColor="#ffffffff" android:layout_centerInParent="true" android:gravity="center"/></RelativeLayout>
Activity的代碼為:
public class MainActivity extends Activity { private Button mButton; private PopupWindow mPopupWindow; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); View popupView = getLayoutInflater().inflate(R.layout.layout_popupwindow, null); mPopupWindow = new PopupWindow(popupView, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, true); mPopupWindow.setTouchable(true); mPopupWindow.setOutsideTouchable(true); mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources(), (Bitmap) null)); mButton = (Button) findViewById(R.id.btn_test_popupwindow); mButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mPopupWindow.showAsDropDown(v); } }); }}
這三行代碼
mPopupWindow.setTouchable(true);mPopupWindow.setOutsideTouchable(true);mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources(), (Bitmap) null));
的作用是點擊空白處的時候PopupWindow會消失
mPopupWindow.showAsDropDown(v);
這一行代碼將PopupWindow以一種向下彈出的動畫的形式顯示出來
public void showAsDropDown(View anchor, int xoff, int yoff)
這個函數的第一個參數為一個View,我們這裡是一個Button,那麼PopupWindow會在這個Button下面顯示,xoff,yoff為顯示位置的位移。
點擊按鈕,就會顯示出PopupWindow
很多時候我們把PopupWindow用作自訂的菜單,需要一個從底部向上彈出的效果,這就需要為PopupWindow添加動畫。
在工程res下建立anim檔案夾,在anim檔案夾先建立兩個xml檔案
menu_bottombar_in.xml
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="250" android:fromYDelta="100.0%" android:toYDelta="0.0" /></set>
menu_bottombar_out.xml
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="250" android:fromYDelta="0.0" android:toYDelta="100%" /></set>
在res/value/styles.xml添加一個sytle
<style name="anim_menu_bottombar"> <item name="android:windowEnterAnimation">@anim/menu_bottombar_in</item> <item name="android:windowExitAnimation">@anim/menu_bottombar_out</item> </style>
Acivity修改為
public class MainActivity extends Activity { private PopupWindow mPopupWindow; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); View popupView = getLayoutInflater().inflate(R.layout.layout_popupwindow, null); mPopupWindow = new PopupWindow(popupView, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, true); mPopupWindow.setTouchable(true); mPopupWindow.setOutsideTouchable(true); mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources(), (Bitmap) null)); mPopupWindow.getContentView().setFocusableInTouchMode(true); mPopupWindow.getContentView().setFocusable(true); mPopupWindow.getContentView().setOnKeyListener(new OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_MENU && event.getRepeatCount() == 0 && event.getAction() == KeyEvent.ACTION_DOWN) { if (mPopupWindow != null && mPopupWindow.isShowing()) { mPopupWindow.dismiss(); } return true; } return false; } }); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_MENU && event.getRepeatCount() == 0) { if (mPopupWindow != null && !mPopupWindow.isShowing()) { mPopupWindow.showAtLocation(findViewById(R.id.layout_main), Gravity.BOTTOM, 0, 0); } return true; } return super.onKeyDown(keyCode, event); }}
這樣點擊菜單鍵會彈出自訂的PopupWindow,點擊空白處或者返回鍵、菜單鍵,PopupWindow會消失。
Android PopupWindow的提示