Summary of commonly used methods in Android Development

1. Determine whether the service is running
 Public static Boolean isservicerunning (context, string servicename ){
  Boolean isrunning = false;
  Activitymanager = (activitymanager) Context
    . Getsystemservice (context. activity_service );
  List <activitymanager. runningserviceinfo> servicelist = activitymanager
    . Getrunningservices (integer. max_value );
  If (! (Servicelist. Size ()> 0 )){
   Return false;
  }
  For (INT I = 0; I <servicelist. Size (); I ++ ){
   Runningserviceinfo Si = (runningserviceinfo) servicelist. Get (I );
   If (Si. Service. getclassname (). Equals (servicename )){
    Isrunning = true;
    Break;
   }
  }
  Return isrunning;
 }

2. Determine whether the memory card is inserted
 Public static Boolean isexternalstorageavailabLe (){
  String state = environment. getexternalstoragestate ();
  If (environment. media_mounted.equals (State )){
   Return true;
  } Else {
   Return false;
  }
 }

3. Obtain the path of the file
 Public static string getsdcardpath (string Foldername ){
  If (Foldername! = NULL ){
   String Path = environment. getexternalstoragedirectOry ()
   . Getabsolutepath () + file. Separator + Foldername;
   File file = new file (PATH );
   If (! File. exists ()){
    File. mkdir ();
   }
   Return path;
  } Else {
   Return NULL;
  }
 }

4. Obtain the IMEI of the mobile phone
 Public static string getimei (context CTX ){
  If (CTX! = NULL ){
   String IMEI = "";
   Telephonymanager = (telephonymanager) CTX
     . Getsystemservice (context. telephony_service );
   If (telephonymanager! = NULL)
    IMEI = telephonymanager. getdeviceid ();
   If (IMEI = "")
    IMEI = "0 ";
   Return IMEI;
  } Else {
   Return NULL;
  }
 }

5. Obtain the mobile phone number
 Public static string getphonenumber (context CTX ){
  If (CTX! = NULL ){
   String number = "";
   Telephonymanager = (telephonymanager) CTX
   . Getsystemservice (context. telephony_service );
   If (telephonymanager! = NULL)
    Number = telephonymanager. getline1number ();
   If (number = "")
    Number = "0 ";
   Return number;
  } Else {
   Return NULL;
  }
 }

6. Obtain the mobile phone status information.
 Public static string fetch_status (context CTX ){
  Telephonymanager TM = (telephonymanager) CTX
    . Getsystemservice (context. telephony_service );//

  String STR = "";
  STR + = "DeviceID (IMEI) =" + TM. getdeviceid () + "\ n ";
  STR + = "devicesoftwareversion =" + TM. getdevicesoftwareversion()
    + "\ N ";
  STR + = "line1number =" + TM. getline1number () + "\ n ";
  STR + = "networkcountryiso =" + TM. getnetworkcountryiso () + "\ n ";
  STR + = "networkoperator =" + TM. getnetworkoperator () + "\ n ";
  STR + = "networkoperatorname =" + TM. getnetworkoperatorname () + "\ n ";
  STR + = "networktype =" + TM. getnetworktype () + "\ n ";
  STR + = "honetype =" + TM. getphonetype () + "\ n ";
  STR + = "simcountryiso =" + TM. getsimcountryiso () + "\ n ";
  STR + = "simoperator =" + TM. getsimoperator () + "\ n ";
  STR + = "simoperatorname =" + TM. getsimoperatorname () + "\ n ";
  STR + = "simserialnumber =" + TM. getsimserialnumber () + "\ n ";
  STR + = "simstate =" + TM. getsimstate () + "\ n ";
  STR + = "subscriberid (imsi) =" + TM. getsubscriberid () + "\ n ";
  STR + = "voicemailnumber =" + TM. getvoicemailnumber () + "\ n ";
  Return STR;
 }

7. Obtain the software version information.
 Public static string getsoftwareversion (context CTX ){
  String version = "";
  Try {
   Packageinfo = CTX. getpackagemanager (). getpackageinfo (
     CTX. getpackagename (), 0 );
   Version = packageinfo. versionname;
  } Catch (packagemanager. namenotfoundexception e ){
   E. printstacktrace ();
  }
  Return version;
 }

8. Get the current date.
 Public static string getcurrdate (string format ){
  String str_format = (format = NULL | format = "")? "Yyyy-mm-dd hh: mm: SS"
    : Format;
  Date = new date ();
  Simpledateformat from = new simpledateformat (str_format );
  String times = from. Format (date );
  Return times;
 }

9. Get Bitmap Based on URL
 Public static bitmap geturlbitmap (string uripic) throws exception {
  URL imageurl = NULL;
  Bitmap bitmap = NULL;
  Try {
   Imageurl = new URL (uripic );
  } Catch (malformedurlexception e ){
   E. printstacktrace ();
  }
  Try {
   Httpurlconnection conn = (httpurlconnection) imageurl
     . Openconnection ();
   Conn. setconnecttimeout (5*1000 );
    Conn. setreadtimeout (5*1000 );
    Conn. setdoinput (true );
    Conn. setdooutput (true );
    Conn. setusecaches (true );
    Conn. setrequestmethod ("Post ");
   Conn. Connect ();
   Inputstream is = conn. getinputstream ();
   Bitmap = bitmapfactory. decodestream (is );
   Is. Close ();
  } Catch (ioexception e ){
   E. printstacktrace ();
  }
  Return bitmap;
 }

10. Hide the app
 Public static void hiddenapp (context CTX ){
  Packagemanager PM = CTX. getpackagemanager ();
  Resolveinfo homeinfo = PM. resolveactivity (
    New intent (intent. action_main)
      . Addcategory (intent. category_home), 0 );
  Activityinfo AI = homeinfo. activityinfo;
  Intent startintent = new intent (intent. action_main );
  Startintent. addcategory (intent. category_launcher );
  Startintent. setcomponent (New componentname (AI. packagename, AI. Name ));
  CTX. startactivity (startintent );
 }

11. Exit the program (3 methods)
 Public static void exitapp (context CTX ){

  Activitymanager AM = (activitymanager)
  CTX. getsystemservice (context. activity_service );
  Am. restartpackage (CTX. getpackagename ());
  
  Intent startmain = new intent (intent. action_main );
  Startmain. addcategory (intent. category_home );
  Startmain. setflags (intent. flag_activity_new_task );
  CTX. startactivity (startmain );
  Android. OS. process. killprocess (Android. OS. process. mypid ());
  System. Exit (0 );
  
  Android. OS. process. killprocess (Android. OS. process. mypid ());
 }

12. query all non-system applications on the mobile phone

 

 PublicStatic list <packageinfo> getallapps (context ){

 List <packageinfo> apps = new arraylist <packageinfo> ();

 Packagemanager pmanager = context. getpackagemanager ();

 // Obtain all applications on the mobile phone

 List <packageinfo> paklist = pmanager. getinstalledpackages (0 );

 For(INT I =
0; I <paklist. Size (); I ++ ){

 Packageinfo Pak = (packageinfo) paklist. Get (I );

 // Determine whether the application is pre-installed.

 If(Pak. applicationinfo. Flags & Pak. applicationinfo. flag_system) <=
0 ){

 // Customs applications

 Apps. Add (PAK );

 }

 }

 ReturnApps;

 }

 13. query all apps that support sharing on the mobile phone

 Public static list <resolveinfo> getmediaapps (context)
 {
  List <resolveinfo> mapps = new arraylist <resolveinfo> ();
  Intent intent = new intent (intent. action_send, null );
  Intent. addcategory (intent. category_default );
  Intent. settype ("text/plain ");
  Packagemanager pmanager = context. getpackagemanager ();
  Mapps = pmanager
    . Queryintentactivities (intent, packagemanager. component_enabled_state_default );
  Return mapps;
 }

 14. Obtain the MAC address and IP address of the andorid mobile phone WiFi connection

  Public static string getinfo ()

 {

 Wifimanager WiFi = (wifimanager) getsystemservice (context. wifi_service );

 Wifiinfo info = wifi. getconnectioninfo ();

 

 String maxtext = info. getmacaddress ();

 String iptext = inttoip (info. getipaddress ());

 String status = "";

 If (WiFi. getwifistate () = wifimanager. wifi_state_enabled)

 {

 Status = "wifi_state_enabled ";

 }

 String SSID = info. getssid ();

 Int networkid = info. getnetworkid ();

 Int speed = info. getlinkspeed ();

 Return "Mac:" + maxtext + "\ n \ r"

 + "IP:" + iptext + "\ n \ r"

 + "WiFi status:" + status + "\ n \ r"

 + "SSID:" + SSID + "\ n \ r"

 + "Net work ID:" + networkid + "\ n \ r"

 + "Connection speed:" + speed + "\ n \ r"

 ;

 }

15. Retrieve all non-system applications on the mobile phone

Public static arraylist <appinfo> getinstalledpackages (context)

{

Arraylist <appinfo> applist = new arraylist <appinfo> ();

List <packageinfo> packages = context. getpackagemanager ()

. Getinstalledpackages (0 );

For (INT I = 0; I <packages. Size (); I ++)

{

Packageinfo = packages. Get (I );

Appinfo tmpinfo = new appinfo ();

Tmpinfo. appname = packageinfo. applicationinfo. loadlabel (

Context. getpackagemanager (). tostring ();

Tmpinfo. packagename = packageinfo. packagename;

Tmpinfo. versionname = packageinfo. versionname;

Tmpinfo. versioncode = packageinfo. versioncode;

Tmpinfo. appicon = packageinfo. applicationinfo

. Loadicon (context. getpackagemanager ());

If (packageinfo. applicationinfo. Flags & applicationinfo. flag_system) = 0)

 {

// If the application is not a system application, add it to applist.

 Applist. Add (tmpinfo );

 }

}

Return applist;

}

16. convert data into byte Arrays

Public byte [] stream2bytes (inputstream is) throws ioexception {

Byte [] Mbyte;

Bytearrayoutputstream baos = new bytearrayoutputstream ();

Byte [] buffer = new byte [1024];

Int length = 0;

While (length = is. Read (buffer, 0, 1024 ))! =-1 ){

Baos. Write (buffer, 0, length );

}

Baos. Flush ();

Mbyte = baos. tobytearray ();

Baos. Close ();

Return Mbyte;

}