Android日常应用记录

1、获取wifi的ip地址

 

WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);   
WifiInfo wifiInfo = wifiManager.getConnectionInfo();   
int ipAddress = wifiInfo.getIpAddress();	
String ipAddressStr = Utils.intToIp(ipAddress); 

public static String convertIpaddr2String(int ipaddr)  {

	byte[] bytes = convertInt2Bytes(ipaddr);

	InetAddress addr = null;

	try {
		addr = InetAddress.getByAddress(bytes);
	} catch (UnknownHostException e) {
		e.printStackTrace();
		return null;
	}

		return addr.getHostAddress();
	}

 

2、 把图片变成圆角

         * 把图片变成圆角 
         * @param bitmap 需要修改的图片 
         * @param pixels 圆角的弧度 
         * @return 圆角图片 
         */  
        public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {  
      
            Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);  
            Canvas canvas = new Canvas(output);  
      
            final int color = 0xff424242;  
            final Paint paint = new Paint();  
            final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());  
            final RectF rectF = new RectF(rect);  
            final float roundPx = pixels;  
      
            paint.setAntiAlias(true);  
            canvas.drawARGB(0, 0, 0, 0);  
            paint.setColor(color);  
            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  
      
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
            canvas.drawBitmap(bitmap, rect, rect, paint);  
      
            return output;  
        }  

 

3、Android边框圆角

 

<?xml version="1.0" encoding="utf-8"?>  
<shape xmlns:android="http://schemas.android.com/apk/res/android">    
    <solid android:color="#000000" />    
    <corners android:topLeftRadius="10dp"   
                    android:topRightRadius="10dp"    
                android:bottomRightRadius="10dp"   
                android:bottomLeftRadius="10dp"/>    
</shape>  

 

解释：solid的表示填充颜色,为了简单，这里用的是黑色。 
而corners则是表示圆角，注意的是这里bottomRightRadius是左下角而不是右下角，bottomLeftRadius右下角。 
当然上面的效果也可以像下面一样设置,如下: <corners android:radius="5dp" />  
如果想引用这个xml，只需要@drawable/corners_bg.xml即可: android:background="@drawable/corners_bg"