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HTML5的Canvas画图模拟太阳系运转

时间:2014-05-10 09:32:09      阅读:640      评论:0      收藏:0      [点我收藏+]

标签:android popup dialog

有一个需求是:在一个图片按钮上点击,在按钮的上方弹出一个弹框,根据弹框的内容页面做不同的显示。这个其实没什么难的,主要是要控制好弹框的显示位置,让弹框显示在图片的正上方的中间。

一开始是用的Popupwindow,但是Popupwindow不能给弹窗之外的页面加一个半透明的蒙层,当然可以在页面上加一个专门的作为蒙层的View,但是很显然,这么做会代码变得很恶心,于是又换成了Dialog,因为Dialog弹出的时候会自动加一个蒙层的,但是这个时候,弹框显示位置的Y坐标不对了,后来一顿查,原来Dialog默认是带有title的,只要把title去掉就可以了,看代码:

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/img1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/img" />
    
    <ImageView
        android:id="@+id/img2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/img1"
        android:layout_marginLeft="50dp"
        android:layout_alignTop="@id/img1"
        android:src="@drawable/img" />

</RelativeLayout>
MainActivity.java:
public class MainActivity extends Activity {

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		final ImageView img1 = (ImageView)this.findViewById(R.id.img1);
		img1.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				usePopup(img1);
			}
		});
		
		final ImageView img2 = (ImageView)this.findViewById(R.id.img2);
		img2.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				useDialog(img2);
			}
		});
	}
}
menu.xml
<?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">

    <RelativeLayout 
        android:id="@+id/menu_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true">
        
	    <TextView
	        android:id="@+id/menu_camera"
	        android:layout_width="100dp"
	        android:layout_height="50dp"
	        android:gravity="center"
	        android:clickable="true"
	        android:text="相机拍照"
	        android:textSize="16sp"
	        android:textColor="@android:color/black"
	        android:background="@android:color/white"/>
	    
	    <View
	        android:id="@+id/menu_sep"
	        android:layout_width="100dp"
	        android:layout_height="1dp"
	        android:background="@android:color/black"
	        android:layout_below="@id/menu_camera"/>
	    
	    <TextView
	        android:id="@+id/menu_album"
	        android:layout_width="100dp"
	        android:layout_height="50dp"
	        android:layout_below="@id/menu_sep"
	        android:gravity="center"
	        android:clickable="true"
	        android:text="选取图片"
	        android:textSize="16sp"
	        android:textColor="@android:color/black"
	        android:background="@android:color/white"/>
	</RelativeLayout>
	
    <ImageView 
            android:id="@+id/arrow_up"
            android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:layout_below="@id/menu_layout"
        	android:layout_marginTop="0dp"
        	android:layout_centerHorizontal="true"
        	android:src="@drawable/arrow_up"/>
    
</RelativeLayout>
MainActivity.java:
private void usePopup(final ImageView anchor){
		//参考: http://www.cnblogs.com/sw926/p/3230659.html
		LayoutInflater mInflater = LayoutInflater.from(this);
	 	ViewGroup rootView = (ViewGroup)mInflater.inflate(R.layout.menu, null);
	 	rootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		final PopupWindow popup = new PopupWindow(this);
		//setContentView之前一定要设置宽高,否则不显示
		popup.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
		popup.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
		//去掉默认的背景 
		popup.setBackgroundDrawable(new ColorDrawable(android.R.color.transparent));
		popup.setContentView(rootView);
		//点击空白处的时候PopupWindow会消失
		popup.setTouchable(true); 
		popup.setOutsideTouchable(true);
		//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。
		popup.setFocusable(true);
		//计算弹框位置
		int[] xy = calcPopupXY(rootView,anchor);
		//不用任何gravity,使用绝对的(x,y)坐标
		popup.showAtLocation((View)anchor.getParent(),Gravity.NO_GRAVITY, xy[0], xy[1]);
	}
	
	private void useDialog(final ImageView anchor){
		LayoutInflater mInflater = LayoutInflater.from(this);
	 	ViewGroup rootView = (ViewGroup)mInflater.inflate(R.layout.menu, null);
	 	rootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		Dialog dialog = new Dialog(this);
		WindowManager.LayoutParams params = dialog.getWindow().getAttributes();
		params.width = WindowManager.LayoutParams.WRAP_CONTENT;
		params.height = WindowManager.LayoutParams.WRAP_CONTENT;
		//去掉默认的背景,下面两个都可以
		dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.R.color.transparent));
		//dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
		//http://stackoverflow.com/questions/12348405/dialog-is-bigger-than-expected-when-using-relativelayout
		//dialog默认都是有title的
		dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题,否则会影响高度计算,一定要在setContentView之前调用,终于明白有一个设置theme的构造函数的目的了
		dialog.setContentView(rootView);
	
		//计算弹框位置
		int[] xy = calcPopupXY(rootView,anchor);
		//gravity的默认值为Gravity.CENTER,即Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL.
		//参考: http://www.cnblogs.com/angeldevil/archive/2012/03/31/2426242.html
		dialog.getWindow().setGravity(Gravity.LEFT | Gravity.TOP);
		params.x = xy[0];
		params.y = xy[1];
		
		dialog.show();
	}
	//参考:http://blog.csdn.net/johnny901114/article/details/7839512
	private int[] calcPopupXY(View rootView, View anchor){
		int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);  
    	int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
    	rootView.measure(w, h);  
    	int popupWidth = rootView.getMeasuredWidth();
    	int popupHeight = rootView.getMeasuredHeight();
    	Rect anchorRect = getViewAbsoluteLocation(anchor);
		int x = anchorRect.left + (anchorRect.right - anchorRect.left)/2 - popupWidth / 2;
		int y = anchorRect.top - popupHeight;
		return new int[]{x,y};
	}
	
    public static Rect getViewAbsoluteLocation(View view){
    	if(view == null){
    		return new Rect();
    	}
		// 获取View相对于屏幕的坐标
		int[] location = new int[2] ;
		view.getLocationOnScreen(location);//这是获取相对于屏幕的绝对坐标,而view.getLocationInWindow(location); 是获取window上的相对坐标,本例中只有一个window,二者等价
		// 获取View的宽高
		int width = view.getMeasuredWidth();
		int height = view.getMeasuredHeight();
		// 获取View的Rect
		Rect rect = new Rect();
		rect.left = location[0];
		rect.top = location[1];
		rect.right = rect.left + width;
		rect.bottom = rect.top + height;
		return rect;
	}


源码在:http://download.csdn.net/download/goldenfish1919/7291951


总结一下:

(1)Popupwindow在显示之前一定要设置宽高,Dialog无此限制。

(2)Popupwindow默认不会响应物理键盘的back,除非显示设置了popup.setFocusable(true);而在点击back的时候,Dialog会消失。

(3)Popupwindow不会给页面其他的部分添加蒙层,而Dialog会。

(4)Popupwindow没有标题,Dialog默认有标题,可以通过dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);取消标题

(5)二者显示的时候都要设置Gravity。如果不设置,Dialog默认是Gravity.CENTER。

(6)二者都有默认的背景,都可以通过setBackgroundDrawable(new ColorDrawable(android.R.color.transparent));去掉。





HTML5的Canvas画图模拟太阳系运转,布布扣,bubuko.com

HTML5的Canvas画图模拟太阳系运转

标签:android popup dialog

原文地址:http://blog.csdn.net/acdreamers/article/details/24982397

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