Common small functions in Android Development

Common small functions in Android Development

1. Obtain the current mobile phone number

 

/*

* Get the current mobile phone number

*/

Public String getLocalNumber (){

TelephonyManager tManager = (TelephonyManager) this

. GetSystemService (TELEPHONY_SERVICE );

String number = tManager. getLine1Number ();

; Return number;

}
 

2. check whether there is a network connection
 

Public boolean checkInternet (){

ConnectivityManager cm = (ConnectivityManager) this

. GetSystemService (Context. CONNECTIVITY_SERVICE );

NetworkInfo info = cm. getActiveNetworkInfo ();

If (info! = Null & info. isConnected ()){

// Connect to the Internet

Return true;

} Else {

// Cannot be connected

Return false;

}

}
 

3. get request network data
 

Public static String GetDate (String url ){

HttpGet = new HttpGet (url );

HttpClient client = new DefaultHttpClient ();

Try {

HttpResponse response = client.exe cute (get );//

Return EntityUtils. toString (response. getEntity ());

} Catch (Exception e ){

Return null;

}

}
 

Obtain the signature information of a program.
 

// Obtain the signature information of the apk package

Private String getSign (Context context ){

PackageManager pm = context. getPackageManager ();

List <PackageInfo> apps = pm. getInstalledPackages (PackageManager. GET_SIGNATURES );

Iterator <PackageInfo> iter = apps. iterator ();

While (iter. hasNext ()){

PackageInfo packageinfo = iter. next ();

String packageName = packageinfo. packageName;

Return packageinfo. signatures [0]. toCharsString ();

If (packageName. equals (instance. getPackageName ())){

MediaApplication. logD (DownloadApk. class, packageinfo. signatures [0]. toCharsString ());

Return packageinfo. signatures [0]. toCharsString ();

}

}

Return null;

}
 

The returned signature is a long string of data.
 

4. Get ctwap or ctnet?
 

/**

* Obtain whether the current access point is ctwap or ctnet.

* @ Author <a href = "mailto: yejiurui@126.com"> yejiurui </a>

* @ Version 1.0 5:46:05 2013

*/

Private String CTWAP = "ctwap ";

Private String CTNET = "ctnet ";

Private Uri PREFERRED_APN_URI = Uri

. Parse ("content: // telephony/carriers/preferapn ");

Public String getApnType (Context context ){

String apntype = "nomatch ";

Cursor c = context. getContentResolver (). query (PREFERRED_APN_URI, null,

Null, null, null );

C. moveToFirst ();

String user = c. getString (c. getColumnIndex ("apn "));

If (user. startsWith (CTNET )){

Apntype = CTNET;

} Else if (user. startsWith (CTWAP )){

Apntype = CTWAP;

}

Return apntype;

}
 

5. Get the IMSI code of the mobile phone?
 

// Obtain the IMSI code of the mobile phone

TelephonyManager telManager = (TelephonyManager) getSystemService (TELEPHONY_SERVICE );

System. out. println ("-----" + telManager. getSubscriberId (); // 2. ----- 460007423945575

System. out. println ("-----" + telManager. getSimSerialNumber (); // 1. ----- 89860089281174245575

System. out. println ("-----" + telManager. getSimOperator ());

System. out. println ("-----" + telManager. getSimCountryIso ());

System. out. println ("-----" + telManager. getSimOperatorName ());

System. out. println ("-----" + telManager. getSimState ());
 

6. determine the current network connection status?
 

/**

* Determine the current network connection status

* @ Param context

* @ Return

*/

Public static boolean isNetworkConnected (Context context ){

NetworkInfo networkInfo = (ConnectivityManager) context

. GetApplicationContext (). getSystemService ("connectivity "))

. GetActiveNetworkInfo ();

If (networkInfo! = Null ){

Return networkInfo. isConnectedOrConnecting ();

}

Return false;

}
 

7. convert a string to an Ascii code?
 

Package com. my. page;

Public class StringToAscii {

Private static String toHexUtil (int n ){

String rt = "";

Switch (n ){

Case 10: rt + = "A"; break;

Case 11: rt + = "B"; break;

Case 12: rt + = "C"; break;

Case 13: rt + = "D"; break;

Case 14: rt + = "E"; break;

Case 15: rt + = "F"; break;

Default:

Rt + = n;

}

Return rt;

}

Public static String toHex (int n ){

StringBuilder sb = new StringBuilder ();

If (n/16 = 0 ){

Return toHexUtil (n );

} Else {

String t = toHex (n/16 );

Int nn = n % 16;

Sb. append (t). append (toHexUtil (nn ));

}

Return sb. toString ();

}

Public static String parseAscii (String str ){

StringBuilder sb = new StringBuilder ();

Byte [] bs = str. getBytes ();

For (int I = 0; I <bs. length; I ++)

Sb. append (toHex (bs [I]);

Return sb. toString ();

}

Public static void main (String args []) {

String s = "xyz ";

System. out. println ("the converted string is:" + StringToAscii. parseAscii (s ));

}

}
 

8. Call the System Browser
 

// Call the System Browser

Intent intent = new Intent ();

Intent. setAction ("android. intent. action. VIEW ");

Uri content_url = Uri. parse (exitUrl );

Intent. setData (content_url );

StartActivity (intent );
 

9. determine the current mobile phone operator
 

// Obtain the IMSI code of the mobile phone

TelephonyManager telManager = (TelephonyManager) getSystemService (TELEPHONY_SERVICE );

String sendNum = null;

String imsi = telManager. getSubscriberId ();;

If (imsi! = Null ){

If (imsi. startsWith ("46000") | imsi. startsWith ("46002 ")){

// Because IMSI under mobile network number 46000 is used up, A 46002 number is virtualized, and this number is used in segment 134/159.

Toast. makeText (getApplicationContext (), "the current mobile number has been sent", 0). show ();

SendNum = Constants. sendNumber_GD;

} Else if (imsi. startsWith ("46001") {// China Unicom

Toast. makeText (getApplicationContext (), "the current Unicom number has been sent", 0). show ();

SendNum = Constants. sendNumber_GD;

} Else if (imsi. startsWith ("46003") {// China Telecom

Toast. makeText (getApplicationContext (), "the current telecom number has been sent", 0). show ();

SendNum = Constants. sendNumber_JT;

}

} Else {

SendNum = Constants. sendNumber_JT; // group number

}
 

10. determine the application installation status on the mobile phone
 

/**

* Determine the installation status of the application on your mobile phone.

* @ Param packageName determine the application package name

*/

Private boolean checkAPK (String packageName ){

List <PackageInfo> pakageinfos = getPackageManager (). getInstalledPackages (PackageManager. GET_UNINSTALLED_PACKAGES );

For (PackageInfo pi: pakageinfos ){

String pi_packageName = pi. packageName;

If (packageName. endsWith (pi_packageName )){

Return true;

}

}

Return false;

}
 

11. Convert the long type into a byte array.

* @ Return returns the byte array converted from the input parameter

*/

Public static byte [] long2Bytes (long l ){

Byte [] bytes = new byte [8];

Int I = 8;

For (byte B: bytes ){

B = (byte) (l & 0xff );

Bytes [-- I] = B;

L >>= 8;

}

Return bytes;

}