Android实用代码七段(四)
2016-05-16 16:50
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来源:http://www.cnblogs.com/over140/p/3133262.html
代码说明:
关键点在这个requestCode,这里使用的是当前系统时间,巧妙的保证了每次都是一个新的Notification产生。
但你运行这代码你会发现毫无作用!正确用法:
ip:192.168.68.128 16 =>hex :c0a84480
注意:setDisplayZoomControls是在API Level 11中新增。
1、发送不重复的通知(Notification)
public static void sendNotification(Context context, String title, String message, Bundle extras) { Intent mIntent = new Intent(context, FragmentTabsActivity.class); mIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); mIntent.putExtras(extras); int requestCode = (int) System.currentTimeMillis(); PendingIntent mContentIntent = PendingIntent.getActivity(context, requestCode, mIntent, 0); Notification mNotification = new NotificationCompat.Builder(context) .setContentTitle(title).setSmallIcon(R.drawable.app_icon) .setContentIntent(mContentIntent).setContentText(message) .build(); mNotification.flags |= Notification.FLAG_AUTO_CANCEL; mNotification.defaults = Notification.DEFAULT_ALL; NotificationManager mNotificationManager = (NotificationManager) context .getSystemService(Context.NOTIFICATION_SERVICE); mNotificationManager.notify(requestCode, mNotification); }
代码说明:
关键点在这个requestCode,这里使用的是当前系统时间,巧妙的保证了每次都是一个新的Notification产生。
2、代码设置TextView的样式
使用过自定义Dialog可能马上会想到用如下代码:new TextView(this,null,R.style.text_style);
但你运行这代码你会发现毫无作用!正确用法:
new TextView(new ContextThemeWrapper(this, R.style.text_style))
3、 ip地址转成8位十六进制串
/** ip转16进制 */ public static String ipToHex(String ips) { StringBuffer result = new StringBuffer(); if (ips != null) { StringTokenizer st = new StringTokenizer(ips, "."); while (st.hasMoreTokens()) { String token = Integer.toHexString(Integer.parseInt(st.nextToken())); if (token.length() == 1) token = "0" + token; result.append(token); } } return result.toString(); } /** 16进制转ip */ public static String texToIp(String ips) { try { StringBuffer result = new StringBuffer(); if (ips != null && ips.length() == 8) { for (int i = 0; i < 8; i += 2) { if (i != 0) result.append('.'); result.append(Integer.parseInt(ips.substring(i, i + 2), 16)); } } return result.toString(); } catch (NumberFormatException ex) { Logger.e(ex); } return ""; }
ip:192.168.68.128 16 =>hex :c0a84480
4、WebView保留缩放功能但隐藏缩放控件
mWebView.getSettings().setSupportZoom(true); mWebView.getSettings().setBuiltInZoomControls(true); if (DeviceUtils.hasHoneycomb()) mWebView.getSettings().setDisplayZoomControls(false);
注意:setDisplayZoomControls是在API Level 11中新增。
5、获取网络类型名称
public static String getNetworkTypeName(Context context) { if (context != null) { ConnectivityManager connectMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectMgr != null) { NetworkInfo info = connectMgr.getActiveNetworkInfo(); if (info != null) { switch (info.getType()) { case ConnectivityManager.TYPE_WIFI: return "WIFI"; case ConnectivityManager.TYPE_MOBILE: return 4000 getNetworkTypeName(info.getSubtype()); } } } } return getNetworkTypeName(TelephonyManager.NETWORK_TYPE_UNKNOWN); } public static String getNetworkTypeName(int type) { switch (type) { case TelephonyManager.NETWORK_TYPE_GPRS: return "GPRS"; case TelephonyManager.NETWORK_TYPE_EDGE: return "EDGE"; case TelephonyManager.NETWORK_TYPE_UMTS: return "UMTS"; case TelephonyManager.NETWORK_TYPE_HSDPA: return "HSDPA"; case TelephonyManager.NETWORK_TYPE_HSUPA: return "HSUPA"; case TelephonyManager.NETWORK_TYPE_HSPA: return "HSPA"; case TelephonyManager.NETWORK_TYPE_CDMA: return "CDMA"; case TelephonyManager.NETWORK_TYPE_EVDO_0: return "CDMA - EvDo rev. 0"; case TelephonyManager.NETWORK_TYPE_EVDO_A: return "CDMA - EvDo rev. A"; case TelephonyManager.NETWORK_TYPE_EVDO_B: return "CDMA - EvDo rev. B"; case TelephonyManager.NETWORK_TYPE_1xRTT: return "CDMA - 1xRTT"; case TelephonyManager.NETWORK_TYPE_LTE: return "LTE"; case TelephonyManager.NETWORK_TYPE_EHRPD: return "CDMA - eHRPD"; case TelephonyManager.NETWORK_TYPE_IDEN: return "iDEN"; case TelephonyManager.NETWORK_TYPE_HSPAP: return "HSPA+"; default: return "UNKNOWN"; } }
6、Android解压Zip包
/** * 解压一个压缩文档 到指定位置 * * @param zipFileString 压缩包的名字 * @param outPathString 指定的路径 * @throws Exception */ public static void UnZipFolder(String zipFileString, String outPathString) throws Exception { java.util.zip.ZipInputStream inZip = new java.util.zip.ZipInputStream(new java.io.FileInputStream(zipFileString)); java.util.zip.ZipEntry zipEntry; String szName = ""; while ((zipEntry = inZip.getNextEntry()) != null) { szName = zipEntry.getName(); if (zipEntry.isDirectory()) { // get the folder name of the widget szName = szName.substring(0, szName.length() - 1); java.io.File folder = new java.io.File(outPathString + java.io.File.separator + szName); folder.mkdirs(); } else { java.io.File file = new java.io.File(outPathString + java.io.File.separator + szName); file.createNewFile(); // get the output stream of the file java.io.FileOutputStream out = new java.io.FileOutputStream(file); int len; byte[] buffer = new byte[1024]; // read (len) bytes into buffer while ((len = inZip.read(buffer)) != -1) { // write (len) byte from buffer at the position 0 out.write(buffer, 0, len); out.flush(); } out.close(); } }//end of while inZip.close(); }//end of func
7、 从assets中读取文本和图片资源
/** 从assets 文件夹中读取文本数据 */ public static String getTextFromAssets(final Context context, String fileName) { String result = ""; try { InputStream in = context.getResources().getAssets().open(fileName); // 获取文件的字节数 int lenght = in.available(); // 创建byte数组 byte[] buffer = new byte[lenght]; // 将文件中的数据读到byte数组中 in.read(buffer); result = EncodingUtils.getString(buffer, "UTF-8"); in.close(); } catch (Exception e) { e.printStackTrace(); } return result; } /** 从assets 文件夹中读取图片 */ public static Drawable loadImageFromAsserts(final Context ctx, String fileName) { try { InputStream is = ctx.getResources().getAssets().open(fileName); return Drawable.createFromStream(is, null); } catch (IOException e) { if (e != null) { e.printStackTrace(); } } catch (OutOfMemoryError e) { if (e != null) { e.printStackTrace(); } } catch (Exception e) { if (e != null) { e.printStackTrace(); } } return null; }
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