Android实用代码七段（四）

Android实用代码七段（四）

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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))
来自这里。

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 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;

}