The "Android tool class" Often uses tool classes (methods) Daquan

To collect frequently used tool classes or methods:

1. Get Phone resolution

/** * Get phone Resolution * /public static String Getdisplaymetrix (context context) {if (Constant. screen. screen_width = =0|| Constant. screen. screen_height = =0) {if (context! = null) {int width =0;int height =0;Sharedpreferences Diaplaymetrixinfo = Context. Getsharedpreferences("Display_metrix_info",0);If (context instanceof Activity) {WindowManager WindowManager = (activity) context). Getwindowmanager();Display display = WindowManager. Getdefaultdisplay();Displaymetrics dm = new Displaymetrics ();Display. Getmetrics(DM);width = DM. Widthpixels;Height = DM. Heightpixels;Editor Editor = Diaplaymetrixinfo. Edit();Editor. Putint("width", width);Editor. Putint("Height", height);Editor. Commit();} else {width = Diaplaymetrixinfo. GetInt("width",0);Height = Diaplaymetrixinfo. GetInt("Height",0);} Constant. screen. screen_width = WIDTH;Constant. screen. screen_height = HEIGHT;}} return Constant. screen. screen_width +"x"+ Constant. screen. screen_height;}

2. Turn off the system's soft keyboard

publicclass SoftKeyboardUtil {    /**     * 关闭系统的软键盘     * @param activity     */    publicstaticvoiddismissSoftKeyboard(Activity activity)    {        View view = activity.getWindow().peekDecorView();        ifnull)        {            InputMethodManager inputmanger = (InputMethodManager)activity.getSystemService(Context.INPUT_METHOD_SERVICE);            0);        }    }}

3. Check if a program is installed

/** * Detects if a program is installed */     Public Static Boolean Isinstalledapp(context context, String PackageName) {Boolean flag =false;Try{Packagemanager pm = Context.getpackagemanager (); List<packageinfo> pkgs = pm.getinstalledpackages (packagemanager.get_uninstalled_packages); for(PackageInfo pkg:pkgs) {//When the name is found and the package name is the same, return                if((Pkg.packagename). Equals (PackageName)) {returnFlag =true; }            }        }Catch(Exception e) {//TODO auto-generated catch blockE.printstacktrace (); }returnFlag }

4. Install APK file

/** * Install. apk file * * @param Context */     Public void Install(context context, String fileName) {if(Textutils.isempty (fileName) | | context = =NULL)        {return; }Try{Intent Intent =NewIntent (Intent.action_view);            Intent.setflags (Intent.flag_activity_new_task);            Intent.setaction (Android.content.Intent.ACTION_VIEW); Intent.setdataandtype (Uri.fromfile (NewFile (FileName),"Application/vnd.android.package-archive");        Context.startactivity (Intent); }Catch(Exception e)        {E.printstacktrace (); }    }/** * Install. apk file * * @param Context */     Public void Install(Context context, file file) {Try{Intent Intent =NewIntent (Intent.action_view); Intent.setdataandtype (uri.fromfile (file),"Application/vnd.android.package-archive");        Context.startactivity (Intent); }Catch(Exception e)        {E.printstacktrace (); }    }

5.DP-PX Mutual Conversion

/** * Based on the resolution of the phone from the DP unit to PX (pixels) * * @return return pixel value * *     Public Static int dp2px(Context context,floatDpvalue) {Final floatScale = Context.getresources (). Getdisplaymetrics (). density;return(int) (Dpvalue * scale +0.5f); }/** * According to the resolution of the phone from px (pixels) to the unit to the DP * * @return return the DP value */     Public Static int PX2DP(Context context,floatPxvalue) {Final floatScale = Context.getresources (). Getdisplaymetrics (). density;return(int) (Pxvalue/scale +0.5f); }

6. How to use "%s" in Strings.xml

adding strings to Strings.xml

stringname="text">Hello,%s!</string>

Used in code

textView.setText(String.format(getResources().getString(R.string.text),"Android"));

Output Result: hello,android!

7. Get device unique encoding based on MAC address +deviceid

Private StaticString Devicekey ="";/** * Get device unique code based on MAC address +deviceid * @return  */     Public StaticStringGetdevicekey()    {if("". Equals (Devicekey)) {String macAddress ="";            Wifimanager wifimgr = (Wifimanager) mainapplication.getins (). Getsystemservice (Mainapplication.wifi_service); Wifiinfo info = (NULL= = Wifimgr?NULL: Wifimgr.getconnectioninfo ());if(NULL! = info) {macAddress = Info.getmacaddress (); } Telephonymanager Telephonymanager = (Telephonymanager) mainapplication.getins (). Getsystemservic            E (Mainapplication.telephony_service);            String deviceId = Telephonymanager.getdeviceid (); Devicekey = MD5UTIL.TOMD5 ("Android"+ Constant.appkey + constant.apppwd + macAddress + deviceId); }returnDevicekey; }

8. Get information about your phone and SIM card

/** * Get information about your phone and SIM card * @param context * @return * *     PublicStaticMap<String,String>Getphoneinfo (Context context) {Map<String,String> Map = NewHashMap<String,String>(); Telephonymanager TM=(Telephonymanager) context.Getsystemservice (Context.Telephony_service);StringImei=Tm.Getdeviceid ();StringImsi=Tm.Getsubscriberid ();StringPhonemode=Android.Os.Build.MODEL;StringPhonesdk=Android.Os.Build.VERSION.RELEASE;Map.Put"IMEI", IMEI);Map.Put"IMSI", IMSI);Map.Put"Phonemode", Phonemode+"##"+PHONESDK);Map.Put"Model", Phonemode);Map.Put"SDK", PHONESDK);return Map; }

9. Press the Back button two times to exit the app

 @Override     Public Boolean OnKeyDown(intKeyCode, KeyEvent event) {if(keycode = = Keyevent.keycode_menu) {return false; }//Press two times to exit the app after pressing the back button        if(Apptools.getfirstdata (indexactivity. This))        {if(keycode = = Keyevent.keycode_back) {if(System.currenttimemillis ()-Touchtime > the) {Toast.maketext (indexactivity. This,"Press again to exit the app", Toast.length_short). Show ();                Touchtime = System.currenttimemillis (); }Else{Screenmanager.getscreenmanager (). Popallactivityexceptmain (Indexactivity.class);                Finish (); }            }return true; }Else{return Super. OnKeyDown (KeyCode, event); }    }

The "Android tool class" Often uses tool classes (methods) Daquan