[Solved] Activity not reading intent from other class in Android SDK

You need to define that constant in MainActivity as public static final String EXTRA_MESSAGE = “extra_message”; so that in DisplayMessageActivity you can access that static constant as String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE); MainActivity public class MainActivity extends AppCompatActivity { public static final String EXTRA_MESSAGE = “extra_message”; // static : accessed by class name // final : … Read more

[Solved] How Android launcher works? [closed]

When you click on app icon android package manager will check manifest file and find launcher activity which has intent filter for that and will search for action as Main and category as default. When it find that detail it will launch that main activity. 2 solved How Android launcher works? [closed]

[Solved] Android NetworkOnMainThreadException [duplicate]

You are not allowed to do network operations with the Main (UI) thread. There are several ways of using background threads. I would recommend using AsyncTask since it has a nice structure which is easy to understand. http://developer.android.com/reference/android/os/AsyncTask.html Here is an SO example also: AsyncTask Android example Should be a lot more available on Google. … Read more

[Solved] What is the best way to have only single database connection throughout whole android app life?

THere is no way, not how you’re doing it. You’re making individual HTTP connections for each request. Unless your webserver only maintains a single instance of a database connection for all requests, its going to create new ones for each request (this would also mean your website only has a single server- in other words … Read more

[Solved] Android app crashes by switching the activity

Replace R.id.tvFeed with Framelayout’s id or default id android.R.id.content. if (savedInstanceState == null) { getFragmentManager().beginTransaction() .add(android.R.id.content, new PlaceholderFragment()) .commit(); } and remove the code from the onOptionsItemSelected() method. if (id == R.id.tvFeed) { return true; } solved Android app crashes by switching the activity

[Solved] button.setOnClickListener not working

Just set onClick in the XML, it’s much easier. android:onClick=”whatever” Then in your class, public void whatever(View v) { // Do your stuff } You do not need all this: button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { image.setImageResource(R.drawable.player_pause); } }); 1 solved button.setOnClickListener not working

[Solved] NullPointerException in android: how to set context?

You might want to set a constant for extra key, to avoid typos or something that looks like A but typed in wrong language. Also it’s good to have constants for actions private static final String EXTRA_A = “A”; private static final String A_RESTORE = “restore”; private static final String A_CLOSE = “close”; I don’t … Read more

[Solved] How to parse JSON data into fragments?

you can parse like this: List<RidesData> ridesDatas; /* this is should be parcelable */ private void setupViewPager(ViewPager viewPager) { ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); adapter.addFragment(FragmentAbout.newInstance(ridesDatas), “ABOUT”); adapter.addFragment(FragmentPointOfInterest.newInstance(ridesDatas),”POI”); viewPager.setAdapter(adapter); } and set constructure to each fragment like this: FragmentAbout.class public static FragmentAbout newInstance(List<RidesData> ridesDatas) { FragmentAbout fragmentAbout = new FragmentAbout(); Bundle arg = new Bundle(); arg.putParcelableArrayList(“data”, … Read more

[Solved] I am trying to parse a data from the following link

Thank You Everyone for Helping out. But I found my answer from the search over the internet. Here I used VOLLEY to call the link. JSON PARSER CLASS public class ParseJSON { public static String[] position1; public static String[] team; public static String[] points; public static final String JSON_ARRAY = “data”; public static final String … Read more