Develop Reference

Adding the if condition quits the android app in telephony manager

I am trying to make a simple android app in which there is a toast message containing the number of the incoming call. I have stored the number in a string variable. When I display just the toast, it works fine but before the toast, if I add a simple if condition comparing the number to another string, the app quits. The required permissions are given. Can someone help me?
This Works:
public void onReceive(Context context, Intent intent) {
String incomingNumber = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
Toast.makeText(context, incomingNumber, Toast.LENGTH_LONG).show();
}
This Does not Work (App quits)
public void onReceive(Context context, Intent intent) {
String incomingNumber = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
if(incomingNumber.equals("+919999999999"))
{
Toast.makeText(context, "Call from Mom", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(context, incomingNumber, Toast.LENGTH_LONG).show();
}
}

It sounds a little silly but I just wrapped my "if" condition in a try-catch block and it solved the problem. I am not used to programming in JAVA so it took me a lot to figure out this simple thing. Thank You All for providing me with suggestions :)

mToast.cancel() is not working

I made a method to make sure my toast messages will be displayed immediately, without having to wait the previous toast to dissapear. The method :
public void myToaster(String message){
if(mToast!=null){
mToast.cancel();
}
mToast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
}
I'm using Android Studio with API23.

mToast is never assigned/reassigned . This
mToast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
should be
mToast = Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG);
mToast.show();
Toast.cancel doesn't remove the current Toast immediately. The fade out animation takes place nevertheless

Android Intents : Receive text data without showing the receiving activity

I've noticed when trying to share text from other Apps and choosing Facebook to save, Facebook's Receiving Activity doesn't open (At least it's that fast, maybe), it only shows a toast confirmation message.
This is how I tried doing it
private void welcomeSharedData(){
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if (Intent.ACTION_SEND.equals(action) && type != null) {
if ("text/plain".equals(type)) {
handleSendText(intent);
saveTextAsNote();
toastMessage();
finish();
}
}
}
My problem with the above is, my App shows a flashing screen of the Activity then goes back to the Calling App.
I want it to be quiet and only reply with a confirmation message on a toast.

Show toast only if it's different from the existing toast

So my goal is to only have a toast message shown to the user if there is no toast message showing or if the message showing is NOT the same as the message I want to send. If the message IS the same as the one being shown to the user, I don't want the message to go through (because that is pointless).
To work towards this goal, I found this post on how to only show a toast if none are being shown.
I have modified the code to fit both requirements.
private Toast toast;
public void showAToast (String st, boolean isLong){
try{
toast.getView().isShown();
String text = ((TextView)((LinearLayout)toast.getView()).getChildAt(0)).getText().toString();
if(!text.equalsIgnoreCase(st)){
//New message, show it after
if(isLong){
toast = Toast.makeText(getApplicationContext(), st, Toast.LENGTH_LONG);
} else {
toast = Toast.makeText(getApplicationContext(), st, Toast.LENGTH_SHORT);
}
toast.show();
}
} catch (Exception e) {
//New message
if(isLong){
toast = Toast.makeText(getApplicationContext(), st, Toast.LENGTH_LONG);
} else {
toast = Toast.makeText(getApplicationContext(), st, Toast.LENGTH_SHORT);
}
toast.show();
}
}
My issue is that any message will not go through if the last toast message was the same as the message that wants to go through.
Not sure exactly why this occurs, but I put some debugging messages in the method to figure out what the issue was.
The messages say that toast.getView().isShown() does not throw the exception (suppose to mean no toast is shown) if any toast message has been sent in the app's lifetime.
So my question is, how can I work around this? Surely there must be a way to achieve this desired functionality.

I saw this before in stackoverflow, but it's not nearly as clean as I would have liked. We implemented a dual toast approach, where it alternates between two toasts. First we define the toasts for the activity prior to the OnCreate:
Toast toast0;
Toast toast1;
private static boolean lastToast0 = true;
In the OnCreate:
toast0 = new Toast(getApplicationContext());
toast0.cancel();
toast1 = new Toast(getApplicationContext());
toast1.cancel();
//And finally, when I need to display the toast and cancel the prior toast at the same time I use something similar to:
if (lastToast0) {
toast0.cancel();
toast1.setDuration(Toast.LENGTH_LONG);
toast1.setText("new message");
toast1.show();
lastToast0 = false;
} else {
toast1.cancel();
toast0.setDuration(Toast.LENGTH_LONG);
toast0.setText("new message");
toast0.show();
lastToast0 = true;
}
// If you need to just cancel an existing toast (before it times out) use:
toast0.cancel();
toast1.cancel();
Quotation

You can use the same Toast instance to show message. If the message is same, the toast will no show twice time, otherwise the text will simple change to the latest one.
Toast mToast;
public void showToast(CharSequence message, int during){
if (mToast == null) {
mToast = Toast.makeText(getApplicationContext(), message, during);
} else {
mToast.setText(message);
}
mToast.show();
}
--↓---↓----↓---update--↓----↓---↓--↓
Sorry about that I miss your point above.
I read the source of Toast that we cannot get the view status since the view had been add to the WindownManager.So far, I cannot find out a method to point whether the Toast is shown.
But you can achieve your own Toast use Service,which likes a toast shown above the application. it may be easier.

onactivityresult() is never called

I am trying to send mail from my app.The problem is after successful/unsuccessful delivery of the email it doesn't return to the activity, meaning that onActivityResult() is not being called.
Here is my code:
String[] recipients = {"soham#gmail.com"};
Intent email = new Intent(Intent.ACTION_SEND, Uri.parse("mailto:"));
// prompts email clients only
email.setType("message/rfc822");
email.putExtra(Intent.EXTRA_EMAIL, recipients);
try{
// the user can choose the email client
startActivityForResult(Intent.createChooser(email, "Choose an email client from..."), 1);
}catch(android.content.ActivityNotFoundException ex){
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if(requestCode == 1){
if(resultCode == RESULT_OK){
}else if (resultCode == RESULT_CANCELED){
}
}
}
I have checked this but not working for me. Can anyone tell me what am I doing wrong.
Edit
I got the problem.It will work fine in Activity.But it will not work on Fragment or FragmentActivity. All fragment is closing down forcefully.You can say my app is going on the background.How to solve this issue?Anybody got any idea.

If i uderstand your problem correctly;
In your activity's onActivityResult part you can find your fragment
YourFragment fragment = (YourFragment)getSupportFragmentManager().findFragmentById(R.id.your_framelayout_id);
And use your fragment's public method:
if(fragment != null)
{
fragment.yourPublicMethod();
}
In yourPublicMethod you can do whatever you want. I hope this helps you.