(Android)五分钟学会PopupWindow

对于自定义窗口，Android提供了PopupWindow，简单实用。
下面我们来看看：
PopupWindow的构造函数
public PopupWindow(View contentView, int width, int height, boolean focusable)
其中contentView为要显示的view，width和height为宽和高，值为像素值，可以是MATCHT_PARENT和WRAP_CONTENT
来设置，如果focusable为false，在一个Activity弹出一个PopupWindow，按返回键，由于PopupWindow没有焦点，会直接退出Activity。如果focusable为true，PopupWindow弹出后，所有的触屏和物理按键都有PopupWindows处理。
如果PopupWindow中有Editor的话，focusable要为true。

下面来看一个简单的demo

主界面：就简单放一个button,点击弹出我们需要的PopupWindow

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/container"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <Button        android:id="@+id/btnOpen"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:text="@string/app_name" /></RelativeLayout>

popupwindow 界面：放了2个button 和一个文本框，用来输入值

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#b5555555" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:background="#eee"        android:orientation="vertical" >        <EditText            android:id="@+id/leaveword"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginBottom="20dp"            android:layout_marginLeft="20dp"            android:layout_marginRight="20dp"            android:layout_marginTop="20dp"            android:gravity="top"            android:hint="说点什么吧~"            android:inputType="textMultiLine"            android:lineSpacingExtra="6.0dp"            android:maxHeight="150dp"            android:minHeight="100dp"            android:paddingLeft="10.0dp"            android:paddingRight="10.0dp"            android:paddingTop="10.0dp" />        <LinearLayout            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginBottom="20dp"            android:gravity="center"            android:orientation="horizontal" >            <Button                android:id="@+id/confirmButton"                android:layout_width="80.0dip"                android:layout_height="wrap_content"                android:gravity="center"                android:text="发表"                android:textColor="#fff"                android:textSize="16.0sp" />            <Button                android:id="@+id/cancleButton"                android:layout_width="80.0dip"                android:layout_height="wrap_content"                android:layout_marginLeft="30dp"                android:gravity="center"                android:text="取消"                android:textColor="#565656"                android:textSize="16.0sp" />        </LinearLayout>    </LinearLayout></RelativeLayout>

效果：

这样我们的界面就算完成了，下来我们来看一个Activity。写个了OpenView 来弹出view

public void OpenView() {LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);popupWindowView = inflater.inflate(R.layout.popupwindow, null);popupWindow = new PopupWindow(popupWindowView,LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, true);// 设置PopupWindow的弹出和消失效果popupWindow.setAnimationStyle(R.style.popupAnimation);btnsure = (Button) popupWindowView.findViewById(R.id.confirmButton);btnsure.setOnClickListener(new ButtonOnClickListener());cancleButton = (Button) popupWindowView.findViewById(R.id.cancleButton);cancleButton.setOnClickListener(new ButtonOnClickListener());leaveword = (EditText) popupWindowView.findViewById(R.id.leaveword);popupWindow.showAtLocation(btnsure, Gravity.CENTER, 0, 0);}

我们看到弹出来的有点动画效果，是因为我们在弹出时，加上了

popupWindow.setAnimationStyle(R.style.popupAnimation);

需要在styles.xml下加上

     <style name="popupAnimation" parent="android:Animation">        <item name="android:windowEnterAnimation">@anim/in</item>        <item name="android:windowExitAnimation">@anim/out</item>    </style>

在在工程res下新建anim文件夹，在anim文件夹先新建两个xml文件

in.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="1500"        android:fromYDelta="5000"        android:toYDelta="0" /></set>

out.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">    <translate        android:fromYDelta="0"        android:toYDelta="5000"        android:duration="1500"    /></set>

如果想要关闭弹出框

调用popupWindow.dismiss();就好

这样一个简单的PopupWindow例子就算完成了

public class MainActivity extends Activity {private View popupWindowView;private PopupWindow popupWindow;private Button btnsure, cancleButton, btnOpen;private EditText leaveword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btnOpen = (Button) findViewById(R.id.btnOpen);btnOpen.setOnClickListener(new ButtonOnClickListener());}public void OpenView() {LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);popupWindowView = inflater.inflate(R.layout.popupwindow, null);popupWindow = new PopupWindow(popupWindowView,LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, true);// 设置PopupWindow的弹出和消失效果popupWindow.setAnimationStyle(R.style.popupAnimation);btnsure = (Button) popupWindowView.findViewById(R.id.confirmButton);btnsure.setOnClickListener(new ButtonOnClickListener());cancleButton = (Button) popupWindowView.findViewById(R.id.cancleButton);cancleButton.setOnClickListener(new ButtonOnClickListener());leaveword = (EditText) popupWindowView.findViewById(R.id.leaveword);popupWindow.showAtLocation(btnsure, Gravity.CENTER, 0, 0);}private class ButtonOnClickListener implements OnClickListener {@Overridepublic void onClick(View vid) {switch (vid.getId()) {case R.id.btnOpen:OpenView();break;case R.id.confirmButton:Toast.makeText(MainActivity.this, leaveword.getText().toString(), Toast.LENGTH_SHORT).show();break;case R.id.cancleButton:popupWindow.dismiss();break;default:break;}}}}

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