Having a very annoying problem with passing data between activities.
This is the code I use to successfully pass the value of a progress bar to a different activity:
public void WhenClicked(View view)
{
view.clearAnimation();
Intent intent = new Intent("com.android.Test.QUESTION");
if (progressBar != null)
{
if (progressBar.getProgress() != 0)
{
intent.putExtra("ProgressBarValue", progressBar.getProgress());
}
}
startActivity(intent);
}
Okay, so that worked. Now, when I change it to this, it blows up:
public void WhenClicked(View view, String category)
{
view.clearAnimation();
Intent intent = new Intent("com.android.Test.QUESTION");
intent.putExtra("Category", category);
if (progressBar != null)
{
if (progressBar.getProgress() != 0)
{
intent.putExtra("ProgressBarValue", progressBar.getProgress());
}
}
startActivity(intent);
}
I don't understand what the problem is. I've even tried sticking it all into a bundle and adding the bundle as an extra - that just made it crash as well. Maybe I'm being stupid and I've just been staring at my code too long, but any help would be great!
This is my first time with Android and it's killing me!
Thanks in advance guys!
first you need to create bundle object(Bundle bnd=new Bundle();) and next bnd.putString("param1", "test");
next create intent:
Intent myIntent = new Intent(current classname.this,nextactivity.class);
myIntent.putExtras(bnd);
startActivityForResult(myIntent, 0);
In 2nd activity u need to get bundel value like :
Bundle bundle = this.getIntent().getExtras();
String _getData=bundle.getString("param1");
Assuming that you have an activity called QUESTION, you might try to put .class on the end as well as "this" for first param:
Intent intent = new Intent(this, QUESTION.class);
if you don't have a QUESTION activity then that is another problem. I'm assuming your activities are in the same app?
I believe, the activity which should handle this intent action com.android.Test.QUESTION does not understand your category i.e intent.putExtra("Category", category);.
You can try fixing it in 2 ways:
If the receiving activity is from your own application, then try using explicit intent i.e Intent intent = new Intent("youCurrentClass","theClassYouWantToCall"); without feeding additional category, this will launch the specified activity. In case of explicit Intent Android system does not do a comparison with the intent-filters to match Intent Object.
Change the category section in relation to intent receiving Activity.
Hope this helps,
sku
Related
Problem:
When I try to "reuse" so-to-speak a getIntent() with extra values by passing data to it from a second activity, the extra values return null. So I want to pass NoteAdapter Intent Extras to the ViewNote class and I also want to pass EditNote Intent Extras to the ViewNote class using the same string keys.
Something like this: User chooses note > User Views Note > User Edits Note > User Views Note corrected.
What works:
Based upon a user selection of a RecyclerView list of notes, the chosen note through a NoteAdapter has extra details passed to an Intent to a ViewNote class which in turn has a Intent n = getIntent() which these extras are received. Note details are loaded into the ViewNote activity. If the user decides this note needs corrected or updated, then the ViewNote class has an Intent that passes extras to the EditNote class. This all works great!
What doesn't work and What I'm trying to do:
I'm not sure whether this is allowed or can be done but I'm trying to pass extras back to the ViewNote class from the EditNote class using the same Intent n = getIntent() in the ViewNote class used earlier when a note was passed to it.
The ViewNote class getIntent():
Intent n = getIntent();
nNoteID = n.getIntExtra("ID", 0);
String nType = n.getStringExtra("Type");
String nSummary = n.getStringExtra("Summary");
String nSource = n.getStringExtra("Source");
String nAuthors = n.getStringExtra("Authors");
The EditNote Intent to pass extras back to the ViewNote
Intent u = new Intent(EditNote.this, ViewNote.class);
u.putExtra("ID", vNoteID);
u.putExtra("Type", ty);
u.putExtra("Summary", su);
u.putExtra("Source", so);
u.putExtra("Authors",au);
EditNote.this.startActivity(u);
What I have tried:
I've read a few posts here on stackoverflow that appeared to be similar and tried changing the context (thinking maybe that was wrong), and tried using Bundle but neither of those made any difference. I thought maybe the String array values weren't passing so I just passed String variables because the "ID" number as a String seems to pass fine but the other values still return null. I've read some of the Android Developer explanations about Intents and maybe I just don't understand Intents fully or maybe this just can't be done or is not how it should be done.
I'm working in the following:
Intellij Idea 2021.1.1
Java Android v.28 Min v.29 Max
Gradle 4.1.2
The solution was exactly what David Wasser posted in the initial comments above. I needed to use the startActivityForResult and follow the guidelines on how to do so. I did review the Android Development links and other examples online, but this video helped:
Android startActivityForResult Tutorial
These are the code segments in sequence:
ViewNote
menuIntent = new Intent(this, EditNote.class);
menuIntent.putExtra("NoteID", nNoteID);
menuIntent.putExtra("NoteDetails", new ArrayList<>(noteDetails));
if(noteFiles.size() > 0)
menuIntent.putParcelableArrayListExtra("NoteFiles", new ArrayList<>(noteFiles));
startActivityForResult(menuIntent, REQUEST_CODE); // REQUEST_CODE = 1
EditNote
Intent u = new Intent();
u.putExtra("ID", vNoteID);
u.putExtra("Type", ty);
u.putExtra("Summary", su);
u.putExtra("Source", so);
u.putExtra("Authors",au);
setResult(RESULT_OK,u);
finish();
Back to ViewNote onActivityResult
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == REQUEST_CODE){
if(resultCode == RESULT_OK) {
nNoteID = data.getIntExtra("ID", 0);
nType = data.getStringExtra("Type");
nSummary = data.getStringExtra("Summary");
nSource = data.getStringExtra("Source");
nAuthors = data.getStringExtra("Authors");
}
}
}
I see that you can bring your activity form the background to the foreground in android using the following lines
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
Now the problem is I don't know how to get the name of the react activity to work - When I try to compile I get
error: cannot find symbol Intent i = new Intent(mReactContext,
MainActivity.class);
symbol: class MainActivity
I'm not very experienced with java - so this is part of my problem, I tried using getCurrentActivity() - but this doesn't seem to work either.
Anyone has an idea?
Thanks!
If you have access to reactContext (I see you have) you can try this:
Context context = getReactApplicationContext();
String pn = context.getApplicationContext().getPackageName();
Intent li = context.getPackageManager().getLaunchIntentForPackage(pn);
context.startActivity(li);
String pn is just a package name (e.g. "com.yourapp"), so you can skip getPackageName() and just pass your package name to getLaunchIntentForPackager(). You can check this solution on react-native-system-notification
You should get reference of your first activity. Then Create your intent and start activity. Run the code below somewhere in your code(for example in a react method which triggers an activity)
Activity currentActivity = getCurrentActivity();
Intent intent = new Intent(name of your activity);
currentActivity.startActivityForResult(intent,FLAG_ACTIVITY_NEW_TASK
);
// create onActivityResult method to process your task according to result
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == FLAG_ACTIVITY_NEW_TASK ) {
// do your job
}
}
It seems you use MainActivity.class as parameter in intent. I'm not an expert but it seems wrong. In a react-native project mainactivity will be triggered automatically and index.android.js will be called. You can use an activity you create as well you don't have to use native android activities like Intent.ACTION_GET_CONTENT which can be used to get information of an image from gallery.
I'm new to android and is currently developing a quest/tresurehunt application. It is a prototype and is going to be evaluated in the field and i would therefore like to implement some sort of cheat to skip checkpoints if the application should crash during the tests.
My application work the way that when you select a quest a activity will be loaded to handle all checkpoints and the user location(ActivityAdapter.java). This activity will open the diffrent navigation tool activities and pass information to them based on the next checkpont using intent. I have implemented a long press event in the app i would like to activate the skip/cheat. My problem is that i can't figure out how to do this.
Location changed event of ActivityAdapter.java:
public void onLocationChanged(Location location) {
location.distanceBetween(location.getLatitude(), location.getLongitude(), lat, lng, dist);
if (dist[0]<= 10) {
if (cid == checkpoints.size()) {
Intent intent = new Intent(ActivityAdapter.this, SuccessActivity.class);
intent.putExtra("title", checkpoints.get(cid).get("title"));
startActivity(intent);
} else {
new loadAndStartQuest().execute();
}
}
}
loadAndStartQuest() just find the next checkpoint and start the right activity (navigationtool). I have tryed creating a object of the ActivityAdapter and set a variable and add it to the the if statement which did not work. I guess it is because it will create another instance of the activity and not affect the current/running one. So how would you communicate between two running activities?
To send data from Activity1 to running Activity2, you must pass through the next steps:
In Manifest.xml set launch mode "singleTask" for Activity2
<activity android:name="Activity2" android:launchMode="singleTask">
Put extras and start Activity2 from Activity1 (if Activity2 was started before, intent will be sended to existing instance).
Intent intent = new Intent(getContext(), Activity2.class);
intent.putExtra("CHECK_POINT", checkPointData);
startActivity(intent)
Override method onNewIntent() in Activity2
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
onNewCheckPoint();
}
private void onNewCheckPoint(){
Intent intent = getIntent();
Bundle extras = intent.getExtras();
//in this moment, you can process data, like you want.
}
I am learning android and curious to know as if startActivityForResult() contains the properties of startActivity() too, i.e. can it be used to send data like startActivity() beside receiving data from called activity?
Here is the code:
SendData Activity:
Intent data= new Intent(SendData.this, RecieveData.class);
Bundle check = new Bundle();
check.putString("UmerData", cheese);
medt.setText(cheese);
data.putExtras(check);
startActivityForResult(data, 5);
Should receive data in this activity (RecieveData Activity)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recievedata);
Initializek();
Bundle got = getIntent().getExtras();
String ss= got.getString("UmerData");
if(getIntent()!=null && ss!=null ) {
rt1.setText("Is not Null");
}
}
Your help will be really appreciated !
Thanks
Yes, startActivity & startActivityForResult, both take intent as param. You can bundle launch data inside intent and pass it over to target activity.
When you use startActivityForResult(), you have to also create a onActivityResult() method within the Activity that called startActivityForResult(). onActivityResult() is where you can access the Intent stored by the Activity you start for a result.
In the Activity that is then started, you have to call setResult() to store the Intent that you store the data in.
Read over this: http://developer.android.com/reference/android/app/Activity.html#StartingActivities
edit: Misread your question. For passing a Bundle of options through, I would use this overload:
startActivity(Intent, int, Bundle)
I'm working in Xamarin Android so the code is C# but I had the same problem except I'm sending between separate apps. I eventually got it working so here is my example.
var intent = new Intent();
intent.SetComponent(new ComponentName("com.company.packageName", "com.company.packageName.activityName"));
intent.PutExtra(Intent.ExtraText, message);
StartActivityForResult(intent, 1);
// in app being started
protected override void OnResume()
{
base.OnResume();
Intent intent = Intent; // Equivalent to getIntent()
if (intent != null)
{
string str = intent.GetStringExtra(Intent.ExtraText);
if (str != null)
{
// Do stuff with str
}
else
{
//Show Error
}
}
else
{
//Show Error
}
}
I have two activitys with lists.
One for tablet's and one for regular density phones.
When an item in the list is clicked it launches the same activity for either activity with list's.
The problem is when an item is clicked i have getter and setter class that gets the URL for a particular item and passes it to the launching activity like this...
private String URL = null;
try{
URL = com.fttech.AbstractFeedsActivity.feed_url;
}
catch(IllegalArgumentException e){
e.printStackTrace();
URL = com.fttech.ItemsActivity.url;
}
As you see what i tried to do is try and catch.
So if the first one isnt found then the second one will be retrieved.
But it doesnt seem to work.
It returns null each time.
For what i have describe what is the best way to implement this?
Is my way logic? Or is there a better way.
Thanks
Try this,
private String URL = null;
try{
URL = com.fttech.AbstractFeedsActivity.feed_url;
if(TextUtils.isEmpty(URL)){
URL = com.fttech.ItemsActivity.url;
// Pass this URL
}
else{
// If its not empty then it will pass the first URL
}
}
catch(IllegalArgumentException e){
e.printStackTrace();
}
No need to pass String to 2 activities, if you want to just pass strings to one or as many activities as you want, just put them in SharedPreferences or declare a variable in static class and then set/get it whenever you want.
Passing values from one Activity to another:
Intent intent = new Intent(context, CalledActivity.class);
intent.putExtra(key, value);
startActivity(intent);
If you want some data back from called Activity then you can use startActivityForResult() as:
Intent intent = new Intent(context, CalledActivity.class);
intent.putExtra(key, value);
startActivityForResult(intent, requestCode);
In called activity you can set data as:
setResult(RESULT_OK, intent);
Note: Here you set the value in intent and pass it to setResult().
On returning back to calling Activity you can get data by overriding:
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK){
//Get data from Intent "data" and do your task here....
}
}
Note: You can pass primitive data type values thru Intent and if you want to pass other types then you have to use Bundle like this.
Bundle data = new Bundle();
data.putIntArray(key, value);
//same way you can set other values.......
//Now set this Bundle value to Intent as you do for primitive type....
Intent intent = new Intent(context, CalledActivity.class);
intent.putExtra(data);
startActivity(intent);
Receiving data in Activity:
//For primitive values:
DataType var_name = getIntent().getExtras().get(key);
//For Bundle values:
Bundle var_name = getIntent().getExtras().getBundle(key);