Android中常用的函数,Android常用函数
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Android中常用的函数,Android常用函数
<无详细内容>1.[Java]代码
//安装apk文件 private void installAPK(File file) { Intent intent = new Intent(Intent.ACTION_VIEW); Uri data = Uri.fromFile(file); String type = "application/vnd.android.package-archive"; intent.setDataAndType(data, type); startActivity(intent); } //卸载apk文件 private void uninstallAPK(String packageName) { Intent intent = new Intent(Intent.ACTION_VIEW); Uri data = Uri.parse("package:" + packageName); intent.setData(data); startActivity(intent); } //编辑图片大小,保持图片不变形。 public static Bitmap resetImage(Bitmap sourceBitmap,int resetWidth,int resetHeight){ int width = sourceBitmap.getWidth(); int height = sourceBitmap.getHeight(); int tmpWidth; int tmpHeight; float scaleWidth = (float)resetWidth / (float)width; float scaleHeight = (float)resetHeight / (float)height; float maxTmpScale = scaleWidth >= scaleHeight ? scaleWidth : scaleHeight; //保持不变形 tmpWidth = (int)(maxTmpScale * width); tmpHeight = (int)(maxTmpScale * height); Matrix m = new Matrix(); m.setScale(maxTmpScale, maxTmpScale, tmpWidth, tmpHeight); sourceBitmap = Bitmap.createBitmap(sourceBitmap, 0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight(), m, false); //切图 int x = (tmpWidth - resetWidth)/2; int y = (tmpHeight - resetHeight)/2; return Bitmap.createBitmap(sourceBitmap, x, y, resetWidth, resetHeight); } //获取本地ip地址 public String getLocalIpAddress() { try { Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); while (en.hasMoreElements()) { NetworkInterface intf = en.nextElement(); Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); while (enumIpAddr.hasMoreElements()) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } } catch (SocketException ex) { ex.printStackTrace(); } return null; } //判断是否为wifi网络 //记得要加权限 android.permission.ACCESS_NETWORK_STATE public static boolean isWifi(Context mContext) { ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) { return true; } return false; } Android验证email地址的函数 static boolean isValidAddress(String address) { // Note: Some email provider may violate the standard, so here we only check that // address consists of two part that are separated by '@', and domain part contains // at least one '.'. int len = address.length(); int firstAt = address.indexOf('@'); int lastAt = address.lastIndexOf('@'); int firstDot = address.indexOf('.', lastAt + 1); int lastDot = address.lastIndexOf('.'); return firstAt > 0 && firstAt == lastAt && lastAt + 1 < firstDot && firstDot <= lastDot && lastDot < len - 1; }
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