Develop Reference

Android - launching intent for Restrict Background Data

Any idea what would be intent to launch application specific Data usage settings to enable/disable Restrict Background Data.
To launch general setting screen following is the post i referred and it worked also
Which Intent for Settings - Data usage
But I need to launch for specific package id.
Please check this launch screen
This screen is for Gmail
Looking for an intent with parameters to launch this screen programmatically.
Any help is appreciated.

Try using this:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(new ComponentName("com.android.settings",
"com.android.settings.Settings$DataUsageSummaryActivity"));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

Start another app from last activity

I need to start another app from my service, but I don't want to "restart" the other app from its main screen. I'd like to open it starting from the last activity the user saw. From my service I'm using:
Intent i = new Intent(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
i.setPackage(lastPackage);
startActivity(i);
but this code doesn't work. I need to use the "new task" flag because I'm in a service. How can I do?

reopen app from background

When user press "Home Button" my app go to Background, but is still running. I need bring my app to front again. For example i've this code:
Context ctx=getApplicationContext();
Intent i =ctx.getPackageManager().getLaunchIntentForPackage("com.example.test");
ctx.startActivity(i);
but this code is to open app in different activity, there are a method or something to do this "correctly"?

You can simulate the "launching" of the app the same way that Android launches the app when the user selects it from the list of available apps. If the user starts an application that is already running, Android just brings the existing task to the foreground (which is what you want). Do it like this:
Intent intent = new Intent(context, SplashScreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // You need this if starting
// the activity from a service
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(intent);
(Source: https://stackoverflow.com/a/12075313/3529926)

You can set this flag to your intent
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
and set the launch mode of your activity to single task in manifest (add this is your activity tags):
android:launchMode="singleTask"

Failed to go back to home screen from Android apps

I have a button in my app named "Go Home" to redirect the user to the home screen. It is working fine without the very first launch. The process of first launch is noted below:
After uploading the APK into SVN I am downloading using the web browser. Then go back to the download folder and installing the app. When install finishes I click on Open. Then In my app I click on the "Go Home" button. The application redirect me to the web browser instead of the home screen. I am tired to search a solution for that.
I am using the following code:
finish();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);
Thanks in advance, Siddiqui Noor

Your app is opening in the task of the browser. Try this:
finish();
Intent intent = new Intent(context, HomeActivity.class);
intent.setAction(Intent.ACTION_MAIN)
.addCategory(Intent.CATEGORY_HOME)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

try adding FLAG_ACTIVITY_NEW_TASK:
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
and also try putting finish() after startActivity

I'm pretty sure that it's not really redirecting you anywhere, it's just closing the Activity. You call finish() after which the intent to start the activity never happens. The app is closed because you've finished the Activity and you end up looking at the screen that was showing before you opened the app. In this case, that is the browser.
Try removing the line to finish();

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);
kill your current activity after redirect the next activity
finish();

Accessing Android Inbox/Messaging from Activity?

Is it possible to open up the default Android Messaging activity from inside an activity you write yourself? Like for example: I press a "Mail" button inside my program, and it opens the Android Messaging app just like as if I was to press the Messaging icon on the main screen.
I did something similar to this with the Contacts activity, but only the contact list comes up, no extra functionality like Adding/Modifying/Deleting, etc.
Any ideas?
edit: I found this way to open the "Compose New Message" Activity, I just need to back it up a step. Does anyone know the correct MIME type instead of this one?
Intent sendIntent = new Intent(Intent.ACTION_VIEW);
sendIntent.setType("vnd.android-dir/mms-sms");
m_activity.startActivity(sendIntent);

This starts the messaging app from another app:
Intent intent = new Intent("android.intent.action.MAIN");
intent.setComponent(new ComponentName("com.android.mms","com.android.mms.ui.ConversationList"));
startActivity(intent);
Just put it inside a button listener or whatever user input you want to open it from.
Enjoy :-)

If you want to open the messaging app to view messages and not for sending a message, this should do the job:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setPackage("com.google.android.apps.messaging");
startActivity(intent);