I have an audio recorder (activity_audio_record_test.xml // AudioRecordTest.java) which opens via an onClick from another activity(addemployee.xml // AddEmployee.java)
On the addemployee I have a text input which is being used to capture the project refrence number.
<EditText
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/txtName"
android:inputType="number"
android:maxLength="5"
android:digits="0123456789"
android:singleLine="true"
/>
which in the Java relates to
txtName=(EditText)findViewById(R.id.txtName);
and
public void btnAddEmp_Click(View view)
{
boolean ok=true;
try
{
Spannable spn=txtAge.getText();
String name=txtName.getText().toString();
int age=Integer.valueOf(spn.toString());
int deptID=Integer.valueOf((int)spinDept.getSelectedItemId());
Employee emp=new Employee(name,age,deptID);
dbHelper.AddEmployee(emp);
}
catch(Exception ex)
{
ok=false;
CatchError(ex.toString());
}
finally
{
if(ok)
{
//NotifyEmpAdded();
Alerts.ShowEmpAddedAlert(this);
txtEmps.setText("Number of Inspections on Device "+String.valueOf(dbHelper.getEmployeeCount()));
}
}
}
by the way, I know that the project refrence is called name, i'll get around to changing that later.
Anyhow, I am writing these audio recordings to a DB and a BYTE BLOB (or at least I plan to and the same with the photos too https://stackoverflow.com/posts/comments/25412248?noredirect=1). I need to use this project ref/txtName/Name field as the unique ID for this? is it possible to "parse"? this over the the second activity?
Thanks in advance,
Henry
More specific details
Page one (activity AddEmployee.Java // addemplyee.xml) is used to type details, multiple text field etc... Page two (activity activity_audio_record_test.xml // AudioRecordTest.java) is called by an onClick to open the second activity, record and save audio notes before returning to the main activity to finish entering the details. There is an input field (project ref/txtName/Name) on the main activity, which must be used as an identifier for the audio notes, to tie them in with the project. How can I get the user inputed ID from, the main activity over to the second activity...so that I am able to use it as a value for an input into the DB?
Hope this helps...
I am not sure if this counts as an answer as such, so I am not going to accept it, however it is a solution.
I am moving all the intents into one activity. Therefore, there is no need to pass the data through to my second activity. Instead, I can just pull the same txtName field to write my data table, image table and audio notes table in one hit.
Simple outside(but not so outside) of the box solution to the problem at hand... Window, white board pen and a flow chart diagram of data transfer helped me here...
Related
First of, I'm a noob in Android development....
So, my problem is - I have a Activity with a EditText view, so someone can put his name in it.
And what I want to do with that input - I want it to be displayed in all activities in TextViews where it needs to be.
Example - Like in a book -> Input name: What are you doing kid? Kir: "I don't know..." Input name: "Just don't do it anymore..."ect.
And then in the next Activity by clicking a Button, the same, I want that same input name to display in ALL ACTIVITES , TextViews where it needs to be, but I don't know how to declare it, where to declare it, what code ect.
I hope you all will understand what i mean.
And thank you for your support.
One way is by passing data into intents before starting the activity.
Intent intent = new Intent(context, MyActivity.class);
intent.putExtra("key_name", "John Cena");
context.startActivity(intent);
Then retrieve the data in MyActivity by:
Bundle extras = getIntent().getExtras();
String name = extras.getString("key_name"); // name should be John Cena
Simillar functionality also exists for Fragments.
Basically you wants to Preserve the Value\Data. For such scenarios, it is best to use [Preferences] where you can save your data on disk in a private file and read it anytime and anywhere.
Android Preferences
Currently im making a soundboard like app. Becouse i have around 60 sounds it would take ages to create function for every single one. So I ran into idea, is it possible to detect press of any of these buttons and then get its id? It will be very helpful, becouse the buttons ids are also corresponding music file names. Thanks for any help.
From the question, it was not immediately clear that you are seeking a way to retrieve information encoded in your choice of ID string names rather than to simply use a single handler for all of your buttons, for which getId alone is typically sufficient.
The resource name for a View ID can be extracted from an ID using View.getResources().getResourceName(id). (1)
The result is a reusable listener that obtains the file names by extracting the view ID and looking up the resource name:
View.OnClickListener mSoundClickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
String resourceName = view.getResources().getResourceName(view.getId());
mySoundHandler(resourceName);
}
};
You can then attach the handler to each button.
button1.setOnClickListener(mSoundClickListener);
button2.setOnClickListener(mSoundClickListener);
//....
I still am a beginner in Android development and will try to make my question as clear as possible with a schema of what I have in my mind.
Purpose of this application:
- I want the user to have the choice between a few buttons and when clicking on any of them, it would open a list view with different content according to the button.
ex : if you click on "Category_1" button, only elements with a fitting id will appear in the listview.
So far, I have :
- defined my "handler" class (extends SQLiteOpenHelper) : name/path of DB, definition of CRUD, .getReadableDatabase, etc.
- define a class for my table, in my case "Restaurants.java" with getters/setters and constructor.
- defined my MainActivity with empty listeners for my button.
- defined my "DatabaseAdapter.java" in which I want to define the methods/sql requests which will communicate with the database and get the information I want from it.
- defined my ListViewActivity with nothing to display so far.
Here is a schema of what I want with the idea of how to make it to try to optimize my application :
To sum up:
- I want a listener for each button setting a variable to a certain value (for example: "if you click on 1 then set the value of A to 1") and opening the ListViewActivity.
- There would be a method defined in "...Adapter.java" sending a request to the database and having the variable A defined earlier as an input.
- And then, when clicking on the button, the ListViewActivity will open and call the method from "..Adapter.java", and finally display the results.
So, here are my questions :
- First of all, is the design optimized enough to allow my application to run fast? I think it should as all the button open only one activity and there is only one method defined for all buttons.
- I have a hard time defining the method in "...Adapter.java" which will be called from my ListViewAcitivity. The input should be the variable obtained when clicking on the button but I don't really know how to get a variable in one activity, open a second activity where to display results by using the variable in a third activity... :s
Is it fine to set a variable to a certain value when we click on a button and use this variable in another class as an input for a method?
public findNameInTable(int A){
string sql = " select NAME from MY_TABLE where CAT1 = " + A;
c = database.rawQuery(sql, null); }
Thanks in advance for any indications, suggestions or links which could help me to make my application come true, and sorry if some questions really sounds newbie, I am starting !
Have a good day !
Part 1: The best way I have found to pass variables to other activities is with a putExtra(String, variable);. Say you change the variable name on a button press, you can then call:
YourNewActivityClassName var = new YourNewActivityClassName();
Intent i = new Intent(context, YourNewActivityClassName.class);
i.putExtra("name", name);
startActivity(i);
Then in the activity you just created, you can call this in the onCreate method:
Intent i = getIntent();
final String name = i.getStringExtra("name");
Of course this is assuming the variable was defined as a String before the putExtra was called.
If you want to use other variable types, there are different get***Extra commands you can call like getIntExtra(int, defaultval) but the putExtra will still be used to send it.
Part 2: For calling a method with a variable assigned in a button click, I have found the best way to do this is with a "holder class" this holder can be defined as a final, and a button press assigns a value to one of it's slots. Here is my holder for Integers:
public class holder {
int to;
public void setTo(int to){
this.to = to;
}
public int getTo(){
return to;
}
}
I instantiate my class as final within my on create final holder hold = new holder();
then call my hold.setTo(int); within a list click listener. When I want to get the data, I simply call hold.getTo(); and I have my integer.
Heres a similar post: Pass value outside of public void onClick
Hope this helps!
Mike
I'd like to ask the logic for first asking the user to fill up a profile form so it is filled, and then directed to the main activity. After closing the app and then re open it again, the profile activity should not be first launched but now the main activity. How can I do this? I'm in need of help. Thanks.
This is what I have tried so far:
private void doThread(){
Thread timer = new Thread(){
public void run(){
try{
sleep(5000); // sleeps/delays for 3 seconds
} // end try
catch(InterruptedException e){
e.printStackTrace();
}finally{
// this is going to create new intent activity for
// based on the action name (com.fps.ihealthfirst.IHEALTHFIRSACTIVITY)
boolean firstTime = mPreferences.getBoolean("user_prefs", true);
if (firstTime) {
Intent myProfile = new Intent( Disclaimer.this, Profile_Pref.class );
startActivity(myProfile);
}
else{
Intent openIHealthFirst = new Intent( "com.fps.iHealthFirst.IHEALTHFIRSTACTIVITY" );
startActivity( openIHealthFirst );
finish();
}
}// end finally
} // end run method
}; // end thread
timer.start();
}
Depending on your choice, you can choose to save the information collected from the Profile Form in either a Database or a SharedPreferences file. This part is rather subjective and if you are already employing a Database in your application, you might consider it.
Here are a few suggestions on handling the logic / flow after the user has setup / entered his Profile details:
First: If you aren't already employing a Splash Screen, you must consider creating one. This will give you a small buffer time to check if the user has already entered his profile details.
Second: If he hasn't, you can open the Profile Form Activity. If, after checking either of the Database or SharedPreferences file, you find data indicating a filled form, you can display the main activity directly.
I personally, would be more inclined towards using SharedPreferences for this task.
Here are a few tutorials to get started with SharedPreferences:
http://android-er.blogspot.in/2011/01/example-of-using-sharedpreferencesedito.html
http://saigeethamn.blogspot.in/2009/10/shared-preferences-android-developer.html
http://myandroidsolutions.blogspot.in/2012/06/android-store-persistent-data-using.html
http://moorandroid.blogspot.in/p/shared-preferences-on-android.html
They may not be specific to your question, but will give you the logic to save values. Retrieving the saved values would be fairly simple.
Hope any of this helps.
One way is to save the form information on to SD card, then load and check for the information, if the information is present there, then you can move to next activity. Check this answer for explanation to it.
Can I have an android activity run only on the first time an application is opened?
The other is to check for a specific shared preference in the main activity, if that shared preference is missing, then launch the single run activity again. Check the following answer for an explanation to it.
How to launch activity only once when app is opened for first time?
Determine if android app is the first time used
You can use SharedPreferences.I had this same question with a good answer here. Check it out.
Everything I've read about Intents talks about using them to push data, or to start one Activity from another Activity. I want to pull data from an Activity that's already running.
The Tab Layout tutorial at http://developer.android.com/resources/tutorials/views/hello-tabwidget.html illustrates what I want to do. (My app is doing some engineering calculations instead, but the tutorial code provides a good analogy to my app.) The tutorial creates an app with three tabs, and each tab hosts a separate activity.
To expand on the example in the tutorial, suppose I select an artist in the Artists tab/activity. I want to be able to select the Albums tab/activity and have it display all the albums featuring that artist.
It seems to me that I need to use an Intent to do this. All of the tutorials I've found assume that I would create a "See albums" Button in the Artists tab/activity, and that pressing the Button would execute an Intent that starts the Albums activity and passes artistName.
I DO NOT want to create that Button. Real estate on the Artists layout is precious, and I have a perfectly good Albums tab, AND the HelloTabWidget activity already contains an intent to create the Albums tab.
Besides, a user will want to skip back and forth between Album and Artist in order to change artist selections, and the tabs are a perfectly good way to do this. There's no need to complicate the UI with another button.
So how can I have the Albums activity PULL artistName from the Artists activity when the Albums tab is selected (or the Albums layout is displayed), rather than have the Artists activity START Albums and PUSH the artistName?
Equivalents I can think of from other programming worlds:
Global variables. Discouraged in Android devt, right? And if they do exist, what are they called?
A getter, like artistName = Artists.getArtistName(); . I get the feeling that it's not that easy.
Writing to, and reading from, a file - that is, mass storage or non-volatile memory. I don't need the artistName value to be permanent. It will be reset to null every time the user launches the application.
So how is it done in the Android world? Do I use an Intent - and if so, how?
Global variables were the right answer.
I thought Java discouraged their use, but a couple of links that appeared in the "Related" links on the right margin of this window mentioned them directly. One was "Android: How to declare global variables?" and the other was "how to pass value betweeen two tab in android". Both pointed to the Application Class as the place to define global variables and methods. Armed with this new knowledge, I found an article called "Android Application Class" on the Xoriant blog that expanded on the StackOverflow answers.
It's best to review those three links first. I need to add some tips to what those authors have said.
Your Application class has to be in its own separate file. (That might be a "duh" to some people, but not to everybody.) Here's a good framework for an example called Something.java:
public class Something extends Application {
// Put application wide (global) variables here
// Constants are final, so they don't have to be private
// But other variables should be declared private;
// use getters/setters to access them
public final boolean FEET = false;
public final boolean METERS = true;
private boolean units = FEET;
#Override
public void onCreate() {
super.onCreate();
// Put any application wide (global) initialization here
}
// Put application wide (global) methods here
public boolean getUnits() {
return units;
}
public void setUnits(boolean whichOne) {
units = whichOne;
}
}
I'm using Eclipse with the ADT plug-in, in Windows XP. Eclipse doesn't always behave properly if you edit XML code directly, so it's best to open AndroidManifest.xml, then select the Application tab and enter your application name in the Name field. You don't need to put a dot or period in front of the name. Just type in the name of your class, like "Globals" or "MyApplication" or whatever. (Note that this is the default application in your Manifest. You don't have to create a separate <application></application> tag.
This step may not be necessary on an actual Android device, but it was necessary for the emulator: you need to use the getApplicationContext() command in every onCreate() and every method that will be accessing the global variables and methods. I tried to put it outside of onCreate() with the rest of my activity wide variables, and it didn't work. Putting it inside every method seems wasteful, but both the emulator and the Android device work fine with it that way. Here's a sample showing how I used it:
public void fooBar() {
// Access to global variables and methods
final Something s = (Something)getApplicationContext();
// ...
// This next line demonstrates both a global method and a global variable
if (s.getUnits() == s.FEET) {
// do something with feet
} else {
// do something with meters instead
}
// ...
}
Those were the only hiccups I encountered. The three references that I have listed, taken together, are otherwise pretty complete.