Develop Reference

How can i use result in main activity

I am new user of android studio. I am using priority in manifest file and all required permissions but I do not know how can I use result in main activity, help me out.
public abstract class SmsBroadcastReceiver extends BroadcastReceiver {
protected abstract void onSmsReceived(SmsMessage smsMessage);```
#Override
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
if (bundle != null) {
Object[] pduObjectList = (Object[]) bundle.get("pdus");
if (pduObjectList != null) {
for (Object pduObject : pduObjectList) {
SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pduObject);
onSmsReceived(smsMessage);
}
}
}
}
}

The abstract keyword is a non-access modifier, used for classes and methods:
Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).
Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).
In your activity:
public class MyActivity extends Activity {
private smsReceiver SmsBroadcastReceiver;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_one_position);
smsReceiver = new SmsBroadcastReceiver() {
// this code is call asyncrously from the receiver
#Override
protected void onSmsReceived() {
// Add your activty logic here
}
};
}
#Override
protected void onPause() {
super.onPause();
this.unregisterReceiver(this.smsReceiver);
}
}

One easy way is by using static variables.
On the MainActivity add the following:
public class MainActivity extends AppCompatActivity{
public static SmsMessage result;
//...
}
Then, add the following line MainActivity.result = smsMessage to the code you provided just after you get the message.
Then you can use the variable result in any part of the MainActivity (also by calling MainActivity.result you have the value of the variable in any part of your code).
Just be careful, static variables are defined as null before any assignment.

Automatic SMS Verification with the SMS Retriever API used so this is easily getting in SMS,So there was no problem and No permission is needed
https://developers.google.com/identity/sms-retriever/overview

show app lock pattern dialog when unlocking the phone

I have MainActivity and on its onResume method I call pattern lock to create and confirm user identity. User visits and leave this MainActivity back and forth while active on the app as well as when phone is in sleep mode and user unlocks it. These both scenarios will call onRestart, onStart and onResume methods, but I only want to revoke the pattern in unlock scenario.
handlePattern() method needs a proper distinguishing to be called.
How to distinguish this when I call the handlePattern method ?
MainActivity.class
onCreate(){}
onResume(){
//help needed to know that user is just visiting activity in app back and forth
or came back after unlocking the screen.
if(isPatternCallRequired){
handlePattern()
}
}

In your onStop() method call you can check if the player is in sleep mode and cache the boolean.
PowerManager pm = (PowerManager)
_context.getSystemService(Context.POWER_SERVICE);
boolean isInSleepMode = !pm.isScreenOn();
Check for the build version
if( Build.VERSION.SDK_INT >= 20)
// use isInteractive()
else
// use isScreenOn()
in onRestart which will get called when you resume from sleep - based on the cached value you can show the pattern to unlock.
You may need to reset the cached value once you are done using it.
onResume may not be a right API for the call as it will be called even when your activity loads.
Edited answer based on your comment

You can try ActivityLifecycleCallbacks too like this,
First, Register your Application in your Application class.
public class StackApp extends Application {
private static final String TAG = StackApp.class.getSimpleName();
public static final String INTENT_ACTION_APP_STATE_CHANGE = "intent_action_app_state_change";
public static final String INTENT_DATA_IS_IN_BACKGROUND = "intent_data_is_in_background";
private static int mNumRunningActivities = 0;
private static AtomicBoolean mIsAppInForeground = new AtomicBoolean();
#Override
public void onCreate() {
super.onCreate();
if (Build.VERSION.SDK_INT >= 14) {
// registerActivityLifecycleCallbacks is supported only from the SDK version 14.
registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
#Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
#Override
public void onActivityStarted(Activity activity) {
mNumRunningActivities++;
if (mNumRunningActivities == 1) {
notifyAppState(false);
Log.i(TAG, "APP IN FOREGROUND");
}
}
#Override
public void onActivityResumed(Activity activity) {
}
#Override
public void onActivityPaused(Activity activity) {
}
#Override
public void onActivityStopped(Activity activity) {
mNumRunningActivities--;
if (mNumRunningActivities == 0) {
notifyAppState(true);
}
}
#Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
#Override
public void onActivityDestroyed(Activity activity) {
}
});
}
}
/**
* To notify App state whether its in ForeGround or in Background
*
* #param isInBackground
*/
private void notifyAppState(boolean isInBackground) {
if (isInBackground) {
mIsAppInForeground.set(false);
} else {
mIsAppInForeground.set(true);
}
sendAppStateChangeBroadcast(isInBackground);
}
public static boolean isInForeground() {
return mIsAppInForeground.get();
}
private void sendAppStateChangeBroadcast(boolean isInBackground) {
Log.i(TAG, "sendAppStateChangeBroadcast - isInBackground : " + isInBackground);
Intent intent = new Intent();
intent.setAction(INTENT_ACTION_APP_STATE_CHANGE);
intent.putExtra(INTENT_DATA_IS_IN_BACKGROUND, isInBackground);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
}
And register the broadcast and listen whether the App is going background or foreground like this Sample Activity example
public class SampleMyActivity extends AppCompatActivity {
private OnAppStateReceiver mAppStateReceiver;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample_my);
mAppStateReceiver = new OnAppStateReceiver();
IntentFilter filter = new IntentFilter(StackApp.INTENT_ACTION_APP_STATE_CHANGE);
LocalBroadcastManager.getInstance(this).registerReceiver(mAppStateReceiver, filter);
}
#Override
protected void onDestroy() {
super.onDestroy();
if (mAppStateReceiver != null) {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mAppStateReceiver);
}
}
private class OnAppStateReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (!TextUtils.isEmpty(action) && StackApp.INTENT_ACTION_APP_STATE_CHANGE.equalsIgnoreCase(action)) {
boolean isGoingBackground = intent.getBooleanExtra(StackApp.INTENT_DATA_IS_IN_BACKGROUND, false);
if (isGoingBackground) {
//Your app is not vissible to the use
} else {
// App is visible to the user.
}
}
}
}
}
Note: If you want to listen in Multiple Activity you can create a base
class and add the listener there and you can do the operation, In that
case you can reduce a lot of code.

How to interact with UI from a different class

I would like to update my UI from a different class. I am familiar with runOnUiThread() method, but don't know how to implement it in this scenario?
public class UploadAct extends MainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
}
//my code and functions would go here
}
Then, my UploadData class
public class UploadData extends UploadAct {
public void doSomethig(){
printThis("I want to print this message to the UI");
}
public void printThis(String messsage) {
final String mess = message;
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),mess,Toast.LENGTH_LONG).show();
// I want this to display on the main thread
txt_upload.setText(mess);// and this also
}
});
}
}

Use BroadcastReceiver
// define a Broadcast Intent Action in String resources
<string name="broadcast_id">MY_BROADCAST_ID</string>
// register receiver in constructor/onCreate()
MyBroadcastReceiver myBroadcastReceiver = new MyBroadcastReceiver();
IntentFilter myIntentFilter = new IntentFilter();
myIntentFilter.addAction(context.getString(R.string.broadcast_id));
context.registerReceiver(myBroadcastReceiver, myIntentFilter);
// place your BroadcastReceiver in MainActivity, your UploadData class
public class MyBroadcastReceiver extends BroadcastReceiver {
public MyBroadcastReceiver(){
super();
}
#Override public void onReceive(Context context, Intent intent) {
Log.d(TAG, "Broadcast received");
if(intent.getAction() != null && intent.getAction().equals(context.getString(R.string.broadcast_id)) ){
// do something
}
}
}
// send Broadcasts from where you want to act, your UploadAct class.
Intent intent = new Intent();
intent.setAction(context.getString(R.string.broadcast_id));
context.sendBroadcast(intent);
Log.d(TAG, "Broadcast sent.");
// you can unregister this receiver in onDestroy() method
context.unregisterReceiver(myBroadcastReceiver);

You can also use an interface to update your UI as a listener.
First, Create an interface
public interface UpdateTextListener {
void updateText(String data);
}
Then, Call its method in your UploadData class
public class UploadData extends UploadAct {
UpdateTextListener listener;
public void doSomethig(){
listener.updateText("data to be loaded");
}
}
Then, Update your UploadAct by listening to this method
public class UploadAct extends MainActivity implements UpdateTextListener {
#Override
public void updateText(String data) {
textview.setText(data);
}
}

First of all - there is no such thing like UI of some class. There are activities that can have handles to UI widgets (ex TextView). If you want to make some changes to UI from your UploadData class you have to pass somehow reference to this class. Possibly by constructor:
public class UploadData extends UploadAct{
private TextView txt_upload;
public UploadData(TextView tv)
{
txt_upload = tv;
}
public void doSomethig(){
printThis("I want to print this message to the UI")
}
public void printThis(String messsage) {
final String mess = message;
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),mess,Toast.LENGTH_LONG).show();// I want this to display on the main thread
txt_upload.setText(mess);// and this also
}
});
}
}
I assume that you create DataUpload in your MainActivity.

Everyone use so much library to be trendy as they forget built in functions in Android :)
For sure isn't any hard thing to use AsyncTask, beside it provides the doInBackground function it has the https://developer.android.com/reference/android/os/AsyncTask.html#publishProgress(Progress...) function too, what you have asked for.
Just create a class (UploadTask) which extends AsyncTask and override 1-2 function.

Sending multiple pieces of data from a fragment to MainActivity (Android Studio)

I currently have a fragment containing two spinners and I want to send the information from both spinners to MainActivity. Is this possible? While my code works when I send the information from just one spinner, as soon as I try and send the information from both spinners (per below), none of the information appears to be transmitted:
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
onNumberInPartyListener = (onNumberInPartyListener) activity;
onMethodOfSplitListener = (onMethodOfSplitListener) activity;
}
catch (Exception ex){}
}
Do I need to create two onAttach methods, two fragments or is there another way?
Thanks
Update:
So I ended up doing away with the above and instead used an 'Interface' java class to send the information from Fragment 1 to Main Activity, however now I'm having issues sending the information from Main Activity to Fragment 2.
In my Main Activity, I'm sending the information to Fragment 2 with the following code (where 'evenSplit_CalculationFragment2' is Fragment 2 and 'tellMeWhatEachPersonOwesES is the method I've implemented in Fragment 2):
//Send data to Even Split Fragment 2
evenSplit_CalculationFragment2.tellMeWhatEachPersonOwesES(eachPersonOwesESString);
And in Fragment 2 I've implemented this as follows:
//What Each Person Owes (from Main Activity)
public void tellMeWhatEachPersonOwesES (String eachPersonOwesThisESString) {
amountEachPersonOwesES.setText(eachPersonOwesThisESString);
}
However, I'm coming up with a Null Pointer exception for both of these. I've tried testing this by substituting 'eachPersonOwesThisESString' with an actual string (e.g. "test") but most baffling of all I still get a Null Pointer exception. Any help appreciated.

You should use Handler
h = new Handler() {
public void handleMessage(android.os.Message msg) {
// Getting data from Handler
tvInfo.setText("Data from Spinner1: " + msg.what);
if (msg.what == 10)
// do what you need
};
};
You can use one handler with different msg.what codes to distinguish them. Initialise it in activity and send to fragment, it will fire up when you write h.sendMessage

If I wanted to solve this problem, what I'd do is use an event bus (although if you really want, you can technically use LocalBroadcastManager with Parcelables).
With Otto event bus, it'd look like this
public enum SingletonBus {
INSTANCE;
private Bus bus;
private Handler handler = new Handler(Looper.getMainLooper());
private SingletonBus() {
this.bus = new Bus(ThreadEnforcer.ANY);
}
public <T> void postToSameThread(final T event) {
bus.post(event);
}
public <T> void postToMainThread(final T event) {
handler.post(new Runnable() {
#Override
public void run() {
bus.post(event);
}
});
}
public <T> void register(T subscriber) {
bus.register(subscriber);
}
public <T> void unregister(T subscriber) {
bus.unregister(subscriber);
}
}
public class YourFragment extends android.support.v4.Fragment {
public static class SpinnersSelectedEvent {
public String firstSpinnerData;
public String secondSpinnerData;
public SpinnersSelectedEvent(String firstSpinnerData, String secondSpinnerData) {
this.firstSpinnerData = firstSpinnerData;
this.secondSpinnerData = secondSpinnerData;
}
}
#OnClick(R.id.yourfragment_thebutton)
public void theButtonClicked() {
SingletonBus.INSTANCE.postToSameThread(new SpinnersSelectedEvent(firstSpinner.getSelectedItem(), secondSpinner.getSelectedItem()); //pseudo code on the spinner part
}
}
public class MainActivity extends AppCompatActivity {
public void onCreate(Bundle saveInstanceState) {
super.onCreate(saveInstanceState);
//...
SingletonBus.INSTANCE.register(this);
}
public void onDestroy() {
super.onDestroy();
SingletonBus.INSTANCE.unregister(this);
}
#Subscribe
public void onSpinnersSelectedEvent(YourFragment.SpinnersSelectedEvent e) {
String firstData = e.firstSpinnerData;
String secondData = e.secondSpinnerData;
// do things
}
}

Android-Libgdx, Calling Another Activity after the Game starts on Button click

I faced a major problem when I need to call another activity when the button is clicked after the Game is started. The Game is called via initiate(game, ) method from AndroidApplication interface.
In normal Activity, I can easily call the another Activity but it seems to be difficult to call another Activity from Libgdx class that implements AndroidApplication.
Could anyone suggest a proper method to call the Activity from Libgdx class that implements AndroidApplication interface?
I tried to do this for a week but it seems that my method is totally wrong..
Thanks in advance.

Define a callback interface in you LibGdx class, and use it to notify your AndroidLauncher to start the new activity.
For example in your LibGdx game class:
// Your Game class in the core package
public class MyGame extends Game {
// Define an interface for your various callbacks to the android launcher
public interface MyGameCallback {
public void onStartActivityA();
public void onStartActivityB();
public void onStartSomeActivity(int someParameter, String someOtherParameter);
}
// Local variable to hold the callback implementation
private MyGameCallback myGameCallback;
// ** Additional **
// Setter for the callback
public void setMyGameCallback(MyGameCallback callback) {
myGameCallback = callback;
}
#Override
public void create () {
...
}
...
private void someMethod() {
...
// check the calling class has actually implemented MyGameCallback
if (myGameCallback != null) {
// initiate which ever callback method you need.
if (someCondition) {
myGameCallback.onStartActivityA();
} else if (someOtherCondition) {
myGameCallback.onStartActivityB();
} else {
myGameCallback.onStartSomeActivity(someInteger, someString);
}
} else {
Log.e("MyGame", "To use this class you must implement MyGameCallback!")
}
}
}
Then ensure your AndroidLauncher implements the required interface:
// Your AndroidLauncher
public class AndroidLauncher extends AndroidApplication implements MyGame.MyGameCallback {
#Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
// create an instance of MyGame, and set the callback
MyGame myGame = new MyGame;
// Since AndroidLauncher implements MyGame.MyGameCallback, we can just pass 'this' to the callback setter.
myGame.setMyGameCallback(this);
initialize(myGame, config);
}
#Override
public void onStartActivityA() {
Intent intent = new Intent(this, ActivityA.class);
startActivity(intent);
}
#Override
public void onStartActivityB(){
Intent intent = new Intent(this, ActivityB.class);
startActivity(intent);
}
#Override
public void onStartSomeActivity(int someParameter, String someOtherParameter){
Intent intent = new Intent(this, ActivityA.class);
// do whatever you want with the supplied parameters.
if (someParameter == 42) {
intent.putExtra(MY_EXTRA, someOtherParameter);
}
startActivity(intent);
}
}