学步园

本文实现

1.  实现PopupWindow的简单示例

2. 通过Code判断能否在PopupWindow上在创建一个PopupWindow

先上效果图

 分别是 ---
Activity  --- PopupWindow1  ----PopupWindow2

PopupWindow是阻塞对话框，只有在外部线程 或者 PopupWindow本身做退出操作才行。

PopupWindow完全依赖Layout做外观，在常见的开发中，PopupWindow应该会与AlertDialog常混用。

实现这个Code 我发现, 如上所说 , 你想在btn2上调用Activity.this.finish()方法试图销毁当前Activity是无效,并且按Back也是无效的
~

main.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/layout">	
    <Button
        android:id="@+id/show"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="show"
        />
</RelativeLayout>

popup1.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"
    android:background="#cccccc" > 
   
    <TextView 
        android:text="@string/hello_world"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <Button 
        android:id="@+id/btn_dismiss"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="dismiss"/>
      <TextView 
        android:text="@string/hello_world"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <Button 
        android:id="@+id/add"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="在PopupWindow AddButton 显示PopupWindow"  
        />
</LinearLayout>

popup2.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="vertical" >
	
    <TextView 
        android:id="@+id/username_view"
        android:text="用户名"
        android:textAppearance="@android:attr/textAppearanceMedium"
        android:layout_marginLeft="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <EditText 
        android:id="@+id/username_edit"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:inputType="none"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
     
     <TextView 
        android:id="@+id/password_view"
        android:text="密码"
        android:layout_marginLeft="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <EditText 
        android:id="@+id/password_edit"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:inputType="none"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    
    
    <LinearLayout android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        
        	<Button android:id="@+id/btn1"
        	    android:layout_weight="1"
        	    android:text="btn1"
        	    android:layout_width="wrap_content"
        	    android:layout_height="wrap_content"/>
        	<Button android:id="@+id/btn2"
        	    android:layout_weight="1"
        	    android:text="btn2"
        	    android:layout_width="wrap_content"
        	    android:layout_height="wrap_content"/>
    </LinearLayout>
    
</LinearLayout>

Java代码

/**
 * PopupWindow :
 * 1 . 阻塞对话框 ,只有在外部线程 或者 PopupWindow本身做退出操作才行{}
 * 2 . 必须依赖Layout布局做外观
 * */

public class MainActivity extends Activity {

	private boolean flag = false;
	PopupWindow popupWindow;
	PopupWindow pop2;
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        preInitUI();
        initUI();
    }
    
    private void preInitUI(){
    	setContentView(R.layout.main);
    	Button show = (Button)findViewById(R.id.show);
    	show.setOnClickListener(listener);
    }
    
    private void initUI(){
    	/**
    	public static LayoutInflater from(Context context) {
	        LayoutInflater LayoutInflater =
	                (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	        if (LayoutInflater == null) {
	            throw new AssertionError("LayoutInflater not found.");
	        }
	        return LayoutInflater;
	    }
    	自定义PopupWindow布局 可以在面动态的添加控件* */
    	LayoutInflater inflater = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    	View layout = inflater.inflate(R.layout.popup, null);
    	
    	popupWindow = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
    	
    	Button btn_dismiss = (Button) layout.findViewById(R.id.btn_dismiss);
    	btn_dismiss.setOnClickListener(listener);
    	Button add = (Button)layout.findViewById(R.id.add);
    	add.setOnClickListener(listener);
    }
   
    private OnClickListener listener = new OnClickListener() {
		
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.btn_dismiss:	openMenu();
				break;
			case R.id.show:	openMenu();
				break;
			case R.id.add:create(); 
				break;
			case R.id.btn1: dis(popupWindow);
				break;
			case R.id.btn2:MainActivity.this.finish();break;
			}
		}
	};
    
	private void  openMenu(){
		if(!flag)
		{
			//overridePendingTransition(R.anim.in, R.anim.out);
			popupWindow.setAnimationStyle(R.style.AppTheme);//设置style样式
			popupWindow.showAtLocation((findViewById(R.id.show)), Gravity.BOTTOM, 0, 0);//显示PopupWindow
			popupWindow.setFocusable(true);//window上面本身要响应点击事件，设置了属性setFocusable(true)
			popupWindow.update();
			
			flag = true;
		}else{
			popupWindow.dismiss();
			popupWindow.setFocusable(false);
			flag = false;	
		}
		
	}
	// Create new PopupWindow 在PopupWindow上再建一个PopupWindow
	private void create()
	{
		LayoutInflater inflater = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    	View layout = inflater.inflate(R.layout.popup2, null);
    	
    	Button exit = (Button)layout.findViewById(R.id.btn1);
    	exit.setOnClickListener(listener);
    	
    	pop2 = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
    	pop2.setAnimationStyle(R.style.AppTheme);
    	// 显示 popupWindow
    	pop2.showAtLocation((findViewById(R.id.show)), Gravity.BOTTOM, 0, 0);
	}
	private void dis(PopupWindow popupwindow)
	{
		pop2.dismiss();
	}
}