Android Development Common Classic Code Snippets collection _android

The example of this article summarizes the common code snippets for Android development. Share to everyone for your reference, specific as follows:

1. Picture rotation

Bitmap bitmaporg = Bitmapfactory.decoderesource (This.getcontext (). Getresources (), r.drawable.moon);
Matrix matrix = new Matrix ();
Matrix.postrotate (-90);//rotation angle
Bitmap resizedbitmap = Bitmap.createbitmap (bitmaporg, 0, 0,
          Bitmaporg.getwidth (), Bitmaporg.getheight (), Matrix, true);
Bitmapdrawable BMD = new bitmapdrawable (RESIZEDBITMAP);

2, get mobile phone number

Create phone management
Telephonymanager TM = (Telephonymanager)
//Connect with mobile phone
Activity.getsystemservice ( Context.telephony_service);
Get mobile number
String Phoneid = Tm.getline1number ();
Remember to add
<uses-permission
android:name= "Android.permission.READ_PHONE_STATE" in manifest file/>
//The program cannot be implemented on the simulator and must be connected to the mobile phone

3. Format the string in the String.xml

In Strings.xml.
<string name= "My_text" >thanks for visiting%s. You
are%d!</string>//and in the Java code:
String.Format (getString (R.string.my_text), "Oschina", 33) ;

4, Android Set Full-screen method

A. Set in Java code

/** full screen settings, hidden window all decoration * * * *
requestwindowfeature (window.feature_no_title);
GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_ fullscreen);

B, in the Androidmanifest.xml configuration

<activity android:name= ". Login.netedit "android:label=" @string/label_net_edit "
      android:screenorientation=" Portrait "Android:theme=" @ Android:style/theme.black.notitlebar.fullscreen ">
 <intent-filter>
 <action android:name=" Android.intent.Net_Edit "/>
 <category android:name=" Android.intent.category.DEFAULT "/>
 </ Intent-filter>
</activity>

5, set the activity for the form of dialog

Configuring the Activity node in Androidmanifest.xml is configured theme as follows:

Android:theme= "@android: Style/theme.dialog"

6, check whether the current network is connected

Connectivitymanager con= (Connectivitymanager) Getsystemservice (activity.connectivity_service);
Boolean Wifi=con.getnetworkinfo (Connectivitymanager.type_wifi). isconnectedorconnecting ();
Boolean Internet=con.getnetworkinfo (Connectivitymanager.type_mobile). isconnectedorconnecting ();

Add Permissions in Androidmanifest.xml:

<uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE"/>

7, to detect whether a intent is effective

public static Boolean isintentavailable (context context, String action) {
  final Packagemanager Packagemanager = Conte Xt.getpackagemanager ();
  Final Intent Intent = new Intent (action);
  list<resolveinfo> list =
      packagemanager.queryintentactivities (Intent,
          Packagemanager.match_ default_only);
  return list.size () > 0;
}

8, Android Phone call

try {
  Intent Intent = new Intent (intent.action_call);
  Intent.setdata (Uri.parse ("tel:+110"));
  StartActivity (intent);
} catch (Exception e) {
  log.e ("SampleApp", "Failed to Invoke call", E);
}

9. Send email in Android

Intent i = new Intent (intent.action_send);
I.settype ("Text/plain"); Simulator please use this line
i.settype ("message/rfc822");//Use this line on the real Machine
I.putextra (intent.extra_email, New string[]{" Test@gmail.com "," test@163.com});
I.putextra (Intent.extra_subject, "SUBJECT goes Here");
I.putextra (Intent.extra_text, "body goes Here");
StartActivity (Intent.createchooser (i, "select Email application."));

10. Open browser in Android

Intent viewintent = new
  Intent ("Android.intent.action.VIEW", Uri.parse ("http://vaiyanzi.cnblogs.com"));
StartActivity (viewintent);

11, Android acquisition device unique identification code

String android_id = secure.getstring (GetContext (). Getcontentresolver (), secure.android_id);

12. Get IP address in Android

Public String getlocalipaddress () {
  try {
    enumeration<networkinterface> en = Networkinterface.getnetworkinterfaces ();
 En.hasmoreelements ();) {
      NetworkInterface intf = En.nextelement ();
      for (enumeration<inetaddress> enumipaddr = intf.getinetaddresses ();
 Enumipaddr.hasmoreelements ();) {
        InetAddress inetaddress = Enumipaddr.nextelement ();
        if (!inetaddress.isloopbackaddress ()) {return
          inetaddress.gethostaddress (). toString ();
  catch (SocketException ex) {
    log.e (Log_tag, ex.tostring ());
  }
  return null;
}

13, Android get the memory card path and usage

/** get the memory card path
/File sdcarddir=environment.getexternalstoragedirectory ();
/** statfs See file system space usage
/statfs statfs=new Statfs (Sdcarddir.getpath ());
size*/
Long blocksize=statfs.getblocksize () of/** block;
/** Total Block Number * *
Long totalblocks=statfs.getblockcount ();
/** already used block number *
/Long availableblocks=statfs.getavailableblocks ();

Add new contacts in Android

Private Uri insertcontact (context context, string name, String phone) {
    contentvalues values = new Contentvalues (); 
   values.put (People.name, NAME);
    Uri uri = Getcontentresolver (). Insert (People.content_uri, values);
    Uri Numberuri = Uri.withappendedpath (URI, People.Phones.CONTENT_DIRECTORY);
    Values.clear ();
    Values.put (Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);
    Values.put (People.number, phone);
    Getcontentresolver (). Insert (Numberuri, values);
    return URI;
}

15. View Battery Usage

Intent intentbatteryusage = new Intent (intent.action_power_usage_summary);
StartActivity (Intentbatteryusage);

16. Get Process Number

Activitymanager Mactivitymanager = (activitymanager) this.getsystemservice (activity_service);
list<activitymanager.runningappprocessinfo> mrunningprocess = mactivitymanager.getrunningappprocesses ();
int i = 1;
for (Activitymanager.runningappprocessinfo amprocess:mrunningprocess) {
 log.e ("Homer Application", (i++) + "PID =" + Amprocess.pid + "; ProcessName = "+ Amprocess.processname);
}

More interested readers of Android-related content can view this site's topics: "Introduction to Android Development and advanced Tutorials", "Summary of Android Control usage", "Android SMS and phone operation Tips" and "Android Multimedia operating Tips Summary" (audio, video, Recording, etc.) "

I hope this article will help you with the Android program.