**Open default browser app**
<code>app.SendIntent(null, null,
"android.intent.action.MAIN",
"android.intent.category.APP_BROWSER");
</code>
**Open default music app**
<code>app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_MUSIC");
</code>
**Open default calculator app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_CALCULATOR");
</code>
**Open default contacts app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_CONTACTS");
</code>
**Open default email app**
<code>
app.SendIntent(null, null,
"android.intent.action.MAIN", 
"android.intent.category.APP_EMAIL");
</code>
**Open default maps app**
<code>
app.SendIntent(null, null, 
“android.intent.action.MAIN”, 
“android.intent.category.APP_MAPS”);
</code>
As an alternative, you may wish to open Google Maps specifically - the code should really be on [[intents:google_maps|this separate page]]

  app.SendIntent(
    "com.google.android.apps.maps",
    null,
    "android.intent.action.VIEW",
    "android.intent.category.DEFAULT",
    "geo:0,0?q=34.5678,123.4567 (Placename)"   // uri argument
  );

Replace the coordinates and Placename in the uri argument with those for the desired location. (Optionally, you can omit Placename along with the parentheses.) 

**Open default gallery app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_GALLERY");
</code>
**Open default calendar app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_CALENDAR");
</code>
**Open default market app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_MARKET");
</code>
**Open default messaging app**
<code>
app.SendIntent(null, null, 
"android.intent.action.MAIN", 
"android.intent.category.APP_MESSAGING");
</code>
**Open bluetooth settings**
<code>
app.SendIntent(null,null,
"android.settings.BLUETOOTH_SETTINGS" )
</code>
**Open WiFi settings**
<code>
app.SendIntent(null,null,
"android.settings.WIFI_SETTINGS" )
</code>

**Other Settings**\\
\\
See https://developer.android.com/reference/android/provider/Settings\\
The Constants section contains Actions (use as 3rd parameter on SendIntent,\\
replacing ACTION_ by android.settings.)\\