Android_CodeWiki_03

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

 1 public static String getNetworkTypeName(Context context) {
 2         if (context != null) {
 3             ConnectivityManager connectMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
 4             if (connectMgr != null) {
 5                 NetworkInfo info = connectMgr.getActiveNetworkInfo();
 6                 if (info != null) {
 7                     switch (info.getType()) {
 8                     case ConnectivityManager.TYPE_WIFI:
 9                         return "WIFI";
10                     case ConnectivityManager.TYPE_MOBILE:
11                         return getNetworkTypeName(info.getSubtype());
12                     }
13                 }
14             }
15         }
16         return getNetworkTypeName(TelephonyManager.NETWORK_TYPE_UNKNOWN);
17     }
18 
19     public static String getNetworkTypeName(int type) {
20         switch (type) {
21         case TelephonyManager.NETWORK_TYPE_GPRS:
22             return "GPRS";
23         case TelephonyManager.NETWORK_TYPE_EDGE:
24             return "EDGE";
25         case TelephonyManager.NETWORK_TYPE_UMTS:
26             return "UMTS";
27         case TelephonyManager.NETWORK_TYPE_HSDPA:
28             return "HSDPA";
29         case TelephonyManager.NETWORK_TYPE_HSUPA:
30             return "HSUPA";
31         case TelephonyManager.NETWORK_TYPE_HSPA:
32             return "HSPA";
33         case TelephonyManager.NETWORK_TYPE_CDMA:
34             return "CDMA";
35         case TelephonyManager.NETWORK_TYPE_EVDO_0:
36             return "CDMA - EvDo rev. 0";
37         case TelephonyManager.NETWORK_TYPE_EVDO_A:
38             return "CDMA - EvDo rev. A";
39         case TelephonyManager.NETWORK_TYPE_EVDO_B:
40             return "CDMA - EvDo rev. B";
41         case TelephonyManager.NETWORK_TYPE_1xRTT:
42             return "CDMA - 1xRTT";
43         case TelephonyManager.NETWORK_TYPE_LTE:
44             return "LTE";
45         case TelephonyManager.NETWORK_TYPE_EHRPD:
46             return "CDMA - eHRPD";
47         case TelephonyManager.NETWORK_TYPE_IDEN:
48             return "iDEN";
49         case TelephonyManager.NETWORK_TYPE_HSPAP:
50             return "HSPA+";
51         default:
52             return "UNKNOWN";
53         }
54     }

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;
    }