Android Practical Code Snippets Common code summary _android

1: Check to see if a memory card is plugged in

Copy Code code as follows:

String status=environment.getexternalstoragestate ();
if (Status.equals (enviroment.media_mounted))
{
Description has SD card insert
}

2: Make an activity transparent

Layout This.settheme (r.style.theme_transparent) is not set in OnCreate;
The following is the definition of theme_transparent (note that TRANSPARENT_BG is a transparent picture)

3: Set handle in Screen element

Use Activity.findviewbyid to get a handle to the element on the screen. Using this handle you can set or get any values that the object exposes.

Copy Code code as follows:

TextView Msgtextview = (TextView) Findviewbyid (r.id.msg);
Msgtextview.settext (R.string.push_me);

4: Send SMS

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String body= "This is MMS demo";
Intent mmsintent = new Intent (intent.action_sendto, Uri.fromparts ("Smsto", number, null));
Mmsintent.putextra (Messaging.key_action_sendto_message_body, body);
Mmsintent.putextra (Messaging.key_action_sendto_compose_mode, true);
Mmsintent.putextra (Messaging.key_action_sendto_exit_on_sent, true);
StartActivity (mmsintent);

5: Send MMS

Copy Code code as follows:

StringBuilder sb = new StringBuilder ();
Sb.append ("file://");
Sb.append (Fd.getabsolutefile ());
Intent Intent = new Intent (intent.action_sendto, Uri.fromparts ("Mmsto", number, null));
Below extra datas are all optional.
Intent.putextra (Messaging.key_action_sendto_message_subject, SUBJECT);
Intent.putextra (Messaging.key_action_sendto_message_body, body);
Intent.putextra (Messaging.key_action_sendto_content_uri, sb.tostring ());
Intent.putextra (Messaging.key_action_sendto_compose_mode, Composemode);
Intent.putextra (Messaging.key_action_sendto_exit_on_sent, exitonsent);
StartActivity (Intent)

6: Send mail

Copy Code code as follows:

MIME = "Img/jpg";
Shareintent.setdataandtype (Uri.fromfile (FD), MIME);
Shareintent.putextra (Intent.extra_stream, Uri.fromfile (FD));
Shareintent.putextra (Intent.extra_subject, SUBJECT);
Shareintent.putextra (Intent.extra_text, body);

7: Register a Broadcastreceiver

Copy Code code as follows:

Registerreceiver (Mmasterresetreciever, New Intentfilter ("Oms.action.MASTERRESET"));
Private Broadcastreceiver Mmasterresetreciever = new Broadcastreceiver () {
public void OnReceive (context context, Intent Intent) {
String action = Intent.getaction ();
if ("Oms.action.MASTERRESET". Equals (action)) {
Recoverdefaultconfig ();
}
}
}

8: Define Contentobserver, monitor a data table

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Private Contentobserver Mdownloadsobserver = new Downloadschangeobserver (Downloads.content_uri);
Private class Downloadschangeobserver extends Contentobserver {
Public downloadschangeobserver (Uri Uri) {
Super (New Handler ());
}
@Override
public void OnChange (Boolean selfchange) {}
}

9: Get Mobile UA

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Public String getuseragent ()
{
String user_agent = productproperties.get (Productproperties.user_agent_key, NULL);
return user_agent;
}

10: Empty the phone cookies

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Cookiesyncmanager.createinstance (Getapplicationcontext ());
Cookiemanager.getinstance (). Removeallcookie (); 11: Establish GPRS connection

Dial the GPRS link.
Private Boolean opendataconnection () {
Set up data connection.
DataConnection conn = Dataconnection.getinstance ();
if (ConnectMode = = 0) {
ret = conn.openconnection (Mcontext, "Cmwap", "Cmwap", "Cmwap");
} else {
ret = conn.openconnection (Mcontext, "cmnet", "", "");
}
}

12:preferenceactivity usage

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public class Setting extends preferenceactivity
｛
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Addpreferencesfromresource (r.xml.settings);
}
｝
Setting.xml:
Android:key= "Seting2″
android:title= "@string/seting2″
android:summary= "@string/seting2″/>
Android:key= "Seting1″
android:title= "@string/seting1″
android:summaryoff= "@string/seting1summaryoff"
android:summaryon= "@stringseting1summaryOff"/>

13: Get data from specified server via httpclient

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Defaulthttpclient httpclient = new Defaulthttpclient ();
HttpGet method = new HttpGet ("http://www.baidu.com/1.html");
HttpResponse resp;
Reader reader = null;
try {
Allclientpnames.timeout
Httpparams params = new Basichttpparams ();
Params.setintparameter (Allclientpnames.connection_timeout, 10000);
Httpclient.setparams (params);
Resp = Httpclient.execute (method);
int status = Resp.getstatusline (). Getstatuscode ();
if (status!= HTTPSTATUS.SC_OK) return false;
HTTPSTATUS.SC_OK;
return true;
catch (Clientprotocolexception e) {
TODO auto-generated Catch block
E.printstacktrace ();
catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
finally {
if (reader!= null) try {
Reader.close ();
catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}