I trying to pass a string from mainActivity to the activity of a
library i been trying using intent but is not recognizing this function has someone done this before?
I get this error:error
create the OFAndroid class like this
public class OFAndroid {
private String text ;
public OFAndroid(String text) {
this.text = text ;
}
public void useText() {
Log.e("TAG" , this.text);
}
}
Inside your MainActivity instantiate OFAndroid:
OFAndroid of = new OFAndroid("some string");
now you can use the passed String
of.useText();
getIntent is a method that is not available in your OFAndroid Class. If you want to access the Intent that was passes to an Activity you should call It from inside an Activity's Class.
Related
MainActivity(Activity)
String emailid=e1.getText().toString();
Intent i = new Intent(MainActivity.this,LongOperation.class);
i.putExtra("emailid",emailid);
LongOperation(Java class )
Intent i = getIntent();
a = i.getStringExtra("emailid");
ERROR MESSAGE:
'getIntent(java.lang.String)' is deprecated as of API 15: Android
4.0.3 (IceCreamSandwich)
In 1st Class:
Intent i = new Intent(MainActivity.this, LongOperation.class);
i.putExtra("emailid", emailid);
startActivity(i);
In 2nd Class:
Intent i = getIntent();
String emailid= i.getStringExtra("emailid");
Intents are used to pass data from one activity to another activity.
So if you want to pass data to a normal Java class i would suggest you to use a getter function in combination with a static java class.
So LongOperation has to look like that:
public class LongOperation {
private static String eMailID;
// gives the variable eMailID in this class the new value mailID
public static void setMailID(String mailID) {
eMailID = mailID;
}
// add additional code here
}
In the MainActivity you have to do sth like:
String emailid = e1.getText().toString();
// set the variable in the LongOperation class
LongOperation.setMailID(emailid);
I hope I got your question right, there are several other ways but that depends on the structure and logic of your code.
In general I would recommend to work not so much witch static, more object orientated. But in this case static might be easier.
Cheers
For example,
public void show_message(String message){
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
I want this method add auto Activity.java when create new activity or java class.
I want to save different methods like this and include it in the my project quickly where it is needed.
What you should do is create a BaseActivity and make your activity extend this BaseActivity. Add all the default methods in this activity so you can use them everywhere. You can refer this Github project for reference. It uses MVP.
Here is direct link to BaseActivity.
You just need to make a Common Utilities class. Just copy and paste the class in whatever project you are using it. Just make its method access specifiers as public staic so that you can easily access it.
For e.g.
CommonUtilities.showToastMessage(String text);
What I would do is create a config class and store all these small things in it. For example have a look at this :
public class Config {
public Context context;
public String sharedPrefsName;
public String carTablesName, carsTableCarColumn, databaseName;
public int databaseNewVersion, databaseOldVersion;
public boolean showNotificationsToCustomer;
public String customerNotificationState;
public String userMobile;
public SharedPreferences preferences;
public String customerChatTableName;
public String customerChatMessageColumn;
public String customerChatSentByCustomerColumn;
public String customerChatTimeColumn;
public String loggedInUserId;
public String loggedInUserName;
public String customerChatSupportNotifyingUrl;
public Config(Context context) {
this.context = context;
customerChatSupportNotifyingUrl = "";
customerChatTableName = "customerChat";
customerChatMessageColumn = "customerMessage";
customerChatTimeColumn = "sentOn";
customerChatSentByCustomerColumn = "isSentByCustomer";
sharedPrefsName = context.getString(R.string.shared_prefs_login_validator);
preferences = context.getSharedPreferences(sharedPrefsName, Context.MODE_PRIVATE);
customerNotificationState = context.getString(R.string.customer_notification_state);
showNotificationsToCustomer = preferences.getBoolean(customerNotificationState, true);
carTablesName = context.getString(R.string.user_car_table);
carsTableCarColumn = context.getString(R.string.user_car_table_car_column);
databaseName = context.getString(R.string.user_db);
databaseNewVersion = 3;
databaseOldVersion = 1;
loggedInUserId = preferences.getString(context.getString(R.string.user_db), "");
userMobile = preferences.getString(context.getString(R.string.user_mobile), "");
loggedInUserName = preferences.getString(context.getString(R.string.user_name), "");
}
}
I've placed all the constants in a single file so you need not look at them always. If your app grows in size this would be extremely useful.
For using a progress dialog I use a class like this :
public class MyProgressDialog extends ProgressDialog {
String title, message;
public MyProgressDialog(Context context, String title, String message) {
super(context);
if (!title.equals("")) this.setTitle(title);
this.setMessage(message);
this.setCancelable(false);
this.setIndeterminate(false);
}
}
This is nothing but a single class that extends ProgressDialog.So you can aquire all the functionalities of the progress dialog class.
Similarly for toast you could do the same. If you want them to appear when the activity gets created simply keep this:
MyProgressDialog dialog=new MyProgressDialog(this,"title","message");
dialog.show();
in your activity's onCreate() method. You can do the same for toast too.
In case if it is a java class just create a constructor and keep that snippet in that constructor..
You need to read about "File Templates" https://riggaroo.co.za/custom-file-templates-android-studio/ this a large topic, but this is worth it.
I was wondering if it was possible to call the methods of an external class without actually having to declare an object of that class. They way I've got it set up causes the ArrayList stored within the object empties every time the method the object is used in is called.
If I can call the method without an object, then I can fix my problem.
Thanks in advance.
calling class:
public class BookingScreen extends Activity {
GAClass sendApplication = new GAClass();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_booking_screen);
}
public void saveBookingInfo(View view) {
EditText applicantNameText = (EditText) findViewById(R.id.applicantNameTextField);
EditText itemToBurnText = (EditText) findViewById(R.id.itemToBurnTextField);
String appName = applicantNameText.getText().toString();
String appItemToBurn = itemToBurnText.getText().toString();
if (appItemToBurn.isEmpty() || appName.isEmpty()) {
Toast.makeText(BookingScreen.this, "Please fill in all fields.", Toast.LENGTH_SHORT).show();
}
else {
sendApplication.storeApplication(appName, appItemToBurn);
this.finish();
}
}
External method class:
public class GAClass {
ArrayList<Application> peopleAttending;
public void storeApplication(String name, String item){
peopleAttending = new ArrayList<>(10);
peopleAttending.add(new Application(name, item));
}
}
You can do something like below
public class GAClass {
public static ArrayList<Application> peopleAttending=null;
public static void storeApplication(String name, String item){
if(null==peopleAttending){
peopleAttending = new ArrayList();
}
peopleAttending.add(new Application(name, item));
}
}
You can invoke above method like below
GAClass.storeApplication(str_name,str_item);
when you make peopleAttending arraylist static it can be access in static method and
if(null==peopleAttending){
peopleAttending = new ArrayList();
}
Above code ensure first time initialization if peopleAttending 9s null
Use static methods. You can call a static method without creating object of enclosing class.
https://docs.oracle.com/javase/tutorial/java/javaOO/classvars.html
What exactly are you trying to achieve?
The static methods in a class would not need an instance of the class so you can make the methods you need (that do not require the state of the object - i.e. do not need a particular object to work on) static and call them like this:
ClassWithStaticMethods.staticMethod() ;
I must pass an ArrayList from one Activity A to another Activity B.
I did it using getSerializableExtra and putExtra methods. I already know the meaning of these methods, but I don't know if stuff that I passed using them is stored permanently in the new activity or if it is necessary to reload activity A in order to retrieve my data in B.
So the question is: how can I load my data in a initial splash screen and then use it in all my others activity without reloading the splash screen?
Don't use Preference Class! Preferences are only used for settings values. For passing data to another Activity use Serializable or Parcelable. Remember that all the objects which will be passed to another activity have to implement Serializable or Parcelable. So you extend the ArrayList to a custom Class which implements Parcelable or Serializable.
You do this like this:
Intent intent = new Intent(getContext(), SomeClass.class);
intent.putSerializableExtra("value", <your serializable object>);
startActivity(intent);
and receive them like
YourObject yourObject = getIntent().getSerializableExtra("value")
or look here for Parcelable
Help with passing ArrayList and parcelable Activity
Data processed in Activity A does not need to process again in Activity B. If the data is computed in A and you send it to B computed, B receives it computed already.
Here are some ways to do it right: http://developer.android.com/guide/topics/data/data-storage.html
You can use Preference class, in which you can define its static instance. Than create variable according your desire datatype (even ArrayList). Make property for get and set of this variable.
Set the value on splash screen and get anywhere in application where you need.
Try this, if you need , I will upload code also.
I have written some code regarding that, it would help other activities to fetch data easily, use this when the data is not confidential,
public class HelperShared {
public static final String score = "Score";
public static final String tag_User_Machine = "tag_User_Machine",
tag_Machine_Machine = "tag_Machine_Machine",
tag_Draw_Machine = "tag_Draw_Machine",
tag_Total_Machine = "tag_Total_Machine";
public static SharedPreferences preferences;
public static Editor editor;
public HelperShared(Context context) {
this.preferences = context.getSharedPreferences(score,
Activity.MODE_PRIVATE);
this.editor = preferences.edit();
}
/*
* Getter and Setter methods for Machine
*/
public void setUserMachine(int UserMachine) {
editor.putInt(tag_User_Machine, UserMachine);
editor.commit();
}
public void setMachineMachine(int MachineMachine) {
editor.putInt(tag_Machine_Machine, MachineMachine);
editor.commit();
}
public void setDrawMachine(int DrawMachine) {
editor.putInt(tag_Draw_Machine, DrawMachine);
editor.commit();
}
public void setTotalMachine(int TotalMachine) {
editor.putInt(tag_Total_Machine, TotalMachine);
editor.commit();
}
public int getUserMachine() {
return preferences.getInt(tag_User_Machine, 0);
}
public int getMachineMachine() {
return preferences.getInt(tag_Machine_Machine, 0);
}
public int getDrawMachine() {
return preferences.getInt(tag_Draw_Machine, 0);
}
public int getTotalMachine() {
return preferences.getInt(tag_Total_Machine, 0);
}
}
if your question is "how can I load my data in a initial splash screen and then use it in all my others activity without reloading the splash screen?" Than I have better solutions for you.
Create a Class Memdata.java
public class Memdata{
private static Memdata instance = null;
private String userobject;
public static Memdata getInstance(){
if ( instance == null){
instance = new Memdata();
}
return instance;
}
public String getuserobject() {
return userobject;
}
public void setuserobject(String userobject) {
this.userobject= userobject;
}
}
on You Splash Screen' onCreate method, set the value
Memdata obj = Memdata.getInstance();
obj.setuserobject("hello");
Than in any activity, where you want to access this variable, just make its object and get value.
Like in MyActivity class
Memdata obj = Memdata.getInstance();
String str = obj.getuserobject()
You can define any type of variable according your requirement.
You can extend the base Application class and add member variables to it:
public class MyApp extends Application {
private String appLevelString;
public String getAppLevelString() {
return this.appLevelString;
}
public void setAppLevelString(String val) {
this.appLevelString= val;
}
}
You will have to update the manifest file as follows:
<application android:icon="#drawable/icon"
android:label="#string/app_name"
android:name="MyApp">
You can get and set data like this:
//For setting
((MyApp) this.getApplication()).setAppLevelString("Test string");
//For getting
String str = ((MyApp) this.getApplication()).getAppLevelString();
I'm trying to get random letter from different class/activity, but for some reason it crashes
randomLogic randomFunc;
String resultRandom = randomFunc.randomLetter(); <- crashes here
randomKana.setText(resultRandom);
And here is the other class:
public String randomLetter(){
int hiraArray = sFirst.length;
String hiragana_array = sFirst[RANDOM.nextInt(hiraArray)];
return hiragana_array;
}
You have only declared randomLogic randomFunc;. But you have not initialized.
Also if randomLogic is a Activity class you should not instantiate a Activity class. Its only declared in manifest and has its own lifecycle.
To pass values between activities use intent.putExtra methods