I am developing an android application. Now i have created one function which create custom dialog box and i want this dialog box to display on every activity. So i need to call this function at every activity. But as the syntax of custom dialog (e.g. Dialog d = new Dialog(home.this)).home is the name of the activity where i have created the function so i am not ale to use this function in any other activity. And i haven't use android that much. So give me good example to solve my problem. Here is my code
here is sample code code of using AlertDialog in all activity.
crate one class file like as allmethod.java
and add this code in that class
public static void showAlert(Activity act,String msg)
{
AlertDialog.Builder alert = new AlertDialog.Builder(act);
alert.setMessage(msg).setPositiveButton("OK", new OnClickListener(){
#Override
public void onClick(DialogInterface dialog, int which)
{
}
}).show();
}
and you can use from any class like as
allmethod.showAlert(Activity,"Message");
In your case..
public void SearchDialog(Context ctx){
final Dialog dialog = new Dialog(ctx);
dialog.setContentView(R.layout.dialogsearch);
dialog.setTitle(" Enter The Text to Search");
dialog.setCancelable(true);
final EditText Text = (EditText) dialog.findViewById(R.id.EdText);
Button buttonOK = (Button) dialog.findViewById(R.id.btnOK);
buttonOK.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
String SearchText = Text.getText().toString();
prefsPrivate =getSharedPreferences(Login.PREFS_PRIVATE,Context.MODE_PRIVATE);
Editor prefsPrivateEdit=prefsPrivate.edit();
prefsPrivateEdit.putString("Text",SearchText);
prefsPrivateEdit.commit();
Intent i = new Intent(ctx,SearchTask.class);
startActivity(i);
dialog.cancel();
}
});
Button buttonCancel = (Button) dialog.findViewById(R.id.btnCancel);
buttonCancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dialog.cancel();
}
});
dialog.show();
}
Just add a Context parameter to your SearchDialog() constructor.
Make it like this:
public SearchDialog(Context context){
//....
}
You could either define your own Interface and implement for every class, or make the main Activity method static (as long as it wont need to access anything in dynamic objects that aren't method arguments).
final class Uutil {
public void static func() {
}
}
then do it in your classes:
class A {
public void f() {
Uutil.func();
}
}
Related
I have successfully implemented a custom Dialog box that appears when the user tries to leave an activity via a back button or by using onBackPressed(). They can simply cancel the dialog box or continue, and leave the activity. This function has been implemented in multiple activities, however its making my code a lot longer than it needs to be. I wanted to know how to create a util that can be referenced in different activities, without the need for the chunk of code to copy pasted multiple times. Please note that I am retrieving the dialog title and description from string.xml
This is my code:
Dialog customDialog;
Button button_one, button_two;
TextView dialog_title, dialog_description;
customDialog = new Dialog(this);
//Back button will close app
#Override
public void onBackPressed() {
customDialog.setContentView(R.layout.custom_dialog_box);
dialog_title = customDialog.findViewById(R.id.dialog_title);
dialog_title.setText(getString(R.string.leaving_activity_warning_title));
dialog_description = customDialog.findViewById(R.id.dialog_description); dialog_description.setText(getString(R.string.leaving_activity_warning_description));
button_one = customDialog.findViewById(R.id.button_one);
button_one.setText(getString(R.string.cancel));
button_two = customDialog.findViewById(R.id.button_two);
button_two.setText(getString(R.string.leave_anyway));
button_one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
customDialog.dismiss();
}
});
button_two.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
customDialog.dismiss();
finish();
overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
}
});
Objects.requireNonNull(customDialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
customDialog.show();
}
UPDATE
Created a Java file called "DialogBoxMessage"
DialogBoxMessage Code:
class DialogBoxMessage {
private Dialog customDialog;
private TextView dialog_title, dialog_description;
private Button button_one, button_two;
//Custom Dialog Box Initialization
DialogBoxMessage(Button myButtonOne, TextView myDialogTitle, TextView myDialogDescription, Dialog myCustomDialog) {
customDialog = myCustomDialog;
button_one = myButtonOne;
button_two = myButtonOne;
dialog_title = myDialogTitle;
dialog_description = myDialogDescription;
}
void leaveActivity() {
customDialog.setContentView(R.layout.custom_dialog_box);
dialog_title = customDialog.findViewById(R.id.dialog_title);
dialog_title.setText(Resources.getSystem().getString(R.string.leaving_activity_warning_title));
dialog_description = customDialog.findViewById(R.id.dialog_description);
dialog_description.setText(Resources.getSystem().getString(R.string.leaving_activity_warning_description));
button_one = customDialog.findViewById(R.id.button_one);
button_one.setText(Resources.getSystem().getString(R.string.cancel));
button_two = customDialog.findViewById(R.id.button_two);
button_two.setText(Resources.getSystem().getString(R.string.leave_anyway));
button_one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
customDialog.dismiss();
}
});
button_two.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
customDialog.dismiss();
}
});
Objects.requireNonNull(customDialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
customDialog.show();
}
}
I input the following code in another activity
Other activity code:
//Reusable exit dialog message
DialogBoxMessage dialogBoxMessage;
//Back button will close app
#Override
public void onBackPressed() {
dialogBoxMessage.leaveActivity();
finish();
}
But it doesn't seem to work, I think there are a lot of issues... please help :(
I assume customDialog is a seperate class you wrote - therefore i would suggest you put main information like contentview, title, message or type in the constructor when you initialize ur Dialog.
For your onClick Method I suggest you create an Interface to handle Button Clicks in your
customDialog class.
This could be implemented as a static method in a utilities class. The method would require 'this' as a parameter, which contains the activity context. The method should return the result of the button press. The activity can use this response to determine if finish() should be called or not.
UPDATE
I had suggested a simple static method, but you've gone down the object-oriented route. That's fine.
However, your constructor requires passing in several views, which wouldn't appear to achieve the code efficiency you are after.
Your constructor should just require the Activity context; everything else is encapsulated in your new class.
In each Activity's onBackPressed method you will need to create the object with
dialogBoxMessage = new DialogBoxMessage(this);
before you can call any of that object's methods.
At first my main problem was at how to call a method from the same class, even tough I think I found a way to do this, it's not working as I expected, and I would like to know what would be the best approach to my case.
This is the code I'm working on:
public class EscolhaAtendimento extends AppCompatActivity {
private ViewPager mSlideViewPager;
private LinearLayout mDotLayout;
String TAG = "TasksSample";
private TextView[] mDots;
private SliderAdapter sliderAdapter;
Dialog myDialog;
#Override
public void onCreate (Bundle SavedInstanceState){
super.onCreate(SavedInstanceState);
setContentView(R.layout.escolha_atendimento);
mSlideViewPager = findViewById(R.id.slideViewPager);
mDotLayout = findViewById(R.id.dotsLayout);
sliderAdapter = new SliderAdapter(this);
mSlideViewPager.setAdapter(sliderAdapter);
addDotsIndicator(0);
mSlideViewPager.addOnPageChangeListener(viewListener);
myDialog = new Dialog(this);
}
public void addDotsIndicator(int position){
mDots = new TextView[8];
mDotLayout.removeAllViews();
for (int i= 0; i < mDots.length; i++){
mDots[i] = new TextView(this);
mDots[i].setText(Html.fromHtml("•"));
mDots[i].setTextSize(35);
mDots[i].setTextColor(getResources().getColor(R.color.colorTransparentWhite));
mDotLayout.addView(mDots[i]);
}
if (mDots.length > 0){
mDots[position].setTextColor(getResources().getColor(R.color.colorWhite));
}
}
ViewPager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener(){
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected (int i) {
switch (i) {
case 0: {
myDialog.show();
}
addDotsIndicator(i);
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
};
public void ShowPopup(View v) {
TextView txtclose;
//Button btnFollow;
myDialog.setContentView(R.layout.pop_upfinal);
txtclose = myDialog.findViewById(R.id.txtclose);
txtclose.setText("X");
//btnFollow = (Button) myDialog.findViewById(R.id.btnfollow);
txtclose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
myDialog.dismiss();
}
});
myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
myDialog.show();
}
}
This class is an activity that on user swipe, the text and image from the buttons will change, even though their IDs will stay the same. (That's controlled by another class, it's working well).
Now, I wanted the image button on the activity do something different depending on which page is selected, and that's why there is a initial switch on the onPageSelected method, inside the Page change listener. The image button in the layout has the android:onClick="ShowPopup" tag, and I guess that also complicates things for me, if I wanted it to do something different in that same activity? Also, calling it that way on the switch, every time I change pages, and go back to the first one the popup window will open, since my call is explicit there. (As I said, even tough I found a way to somehow call my method, or at least it's result, it's not working as I expected).
Edit
I tried then changing it like this, so that the button wouldn't rely on the android:onClick="ShowPopup" Tag, and also wouldn't need to call a void method directly on the switch:
Added
public ImageButton popupchoice;
And also this to onCreate method:
popupchoice = this.findViewById(R.id.imgslide1);
Inside the switch I called it like this to get the button ID:
popupchoice.setOnClickListener(image1);
And set the View.OnClickListener like this:
View.OnClickListener image1 = new View.OnClickListener() {
public void onClick(View v) {
TextView txtclose;
//Button btnFollow;
myDialog.setContentView(R.layout.pop_upfinal);
txtclose = myDialog.findViewById(R.id.txtclose);
txtclose.setText("X");
//btnFollow = (Button) myDialog.findViewById(R.id.btnfollow);
txtclose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
myDialog.dismiss();
}
});
myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
myDialog.show();
}
};
But that returns me:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at .EscolhaAtendimento$1.onPageSelected(EscolhaAtendimento.java:81) Line 81 is the one inside the switch with the popupchoice.setOnClickListener(image1).
This error happens on page change, when coming back to the first Page, and also the button click won't work anymore.
I think you can use
EscolhaAtendimento.this.ShowPopup from inside your switch.
This question already has answers here:
How can I create positive and negative buttons at custom dialogs
(2 answers)
Closed 4 years ago.
I need to set positive and negative buttons for custom dialog.
public void newVisitorDialog(String title, String msg) {
Dialog visitorDialog = new Dialog(FindVisitorMobile.this);
visitorDialog.setCanceledOnTouchOutside(true);
visitorDialog.setContentView(R.layout.new_visitor_dialog);
TextView titleText = visitorDialog.findViewById(R.id.title);
titleText.setText(title);
TextView body = visitorDialog.findViewById(R.id.visitorData);
body.setText(msg);
visitorDialog.show();
}
Thanks,
Add Negative and Positive button in Xml layout.
Find the view of your button.
Set setOnClickListener for both negative and positive button.
Button negative = (Button) visitorDialog.findViewById(R.id.negative_btn);
Button positive = (Button) visitorDialog.findViewById(R.id.positive_btn);
negative.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//process your code here for negative
}
});
positive.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//process your code here for positive
}
});
Do this:
// Use the Builder class for convenient dialog construction
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage(R.string.dialog_fire_missiles)
.setPositiveButton(R.string.fire, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// FIRE ZE MISSILES!
}
})
.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
// Create the AlertDialog object and return it
return builder.create();
For custom dialogs you should include in your R.layout.new_dialog_visitor the two buttons.
Then in your newVisitorDialog method you find the buttons with the .findViewById and call the .setOnClickListener(..) on them.
If its a custom dialog you can create a whole another layout for it
Heres a link
It shows how to add buttons ,textview,images to a dialog.Hope it helps
I found the best way is to set the dialog as a private variable in the class.
private Dialog visitorDialog;
public void newVisitorDialog(String title, String msg) {
visitorDialog = new Dialog(FindVisitorMobile.this);
visitorDialog.setCanceledOnTouchOutside(true);
visitorDialog.setContentView(R.layout.new_visitor_dialog);
TextView titleText = visitorDialog.findViewById(R.id.title);
titleText.setText(title);
TextView body = visitorDialog.findViewById(R.id.visitorData);
body.setText(msg);
visitorDialog.show();
}
/**
* Cancel the visitor dialog
* #param view
*/
public void dialogCancel(View view){
visitorDialog.dismiss();
}
I am new to android development, I have got an weather app, My WeatherFragment class got below code, which is of a fragment class.
btn=(Button)rootView.findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Change city");
final EditText input = new EditText(getActivity());
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
MainActivity obj=new MainActivity();
obj.changeCityLocation(input.getText().toString());
}
});
builder.show();
}
});
return rootView;
}
and I need to call changeCityLocation() which is in MainActivity, which code is:
public void changeCityLocation(String city){
WeatherFragment wf = (WeatherFragment)getSupportFragmentManager()
.findFragmentById(R.id.container);
wf.changeCity(city);
new CityPreference(this).setCity(city);
}
I need to take the input and store in city variable when I click ok but it crashed. Thank you all in advance.
You are doing wrong here
MainActivity obj=new MainActivity();
Because this is not possible. All Activities in android must go through the Activity lifecycle so that they have a valid context attached to activity. so you have to use getActivity() method to get parent activity object and then cast it to MainActivity. like this
((MainActivity) getActivity()).changeCityLocation(input.getText().toString());
This will allow you to access Parent activity methods from fragment.
I am trying to include an AlertDialog builder within a method that prompts for a pin code and when the positive button is pressed, checks it against a database value and returns a true or false value to the method caller.
For example: Adding/editing/deleting a user task requires a pin code. I don't want to generate a different AlertDialog for all three (and more) of these actions. I want to wrap the following code within a TaskService class that I can call from any activity, and react based on the result from within that activity.
So TaskService.java would have:
public boolean isCorrectPin(View v){
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
final EditText editText = new EditText(context);
builder.setView(editText);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if (editText.getText().toString()) == getPinCode(){
//return true
}
}
});
builder.show();
}
and OpenTaskAdapter.java would have:
public void onBindViewHolder(ViewHolder holder, int position){
holder.btnMarkAsComplete.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if (service.isCorrectPin(v) {
//complete task
}
}
});
holder.btnDelete.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if (service.isCorrectPin(v) {
//delete task
}
}
});
It's important to note that these two button listeners could be in totally different activities.
You can create your own method to generate dialog with listener:
public void isCorrectPin(Context context, String title, String message, String btnPositive, final DialogSingleButtonListener dialogSingleButtonListener) {
final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
dialogBuilder.setTitle(title);
dialogBuilder.setMessage(message);
dialogBuilder.setPositiveButton(btnPositive, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if (editText.getText().toString() == getPinCode()){
dialogSingleButtonListener.onButtonClicked(dialog);
}
}
});
AlertDialog dialog = dialogBuilder.create();
dialog.show();
}
And the listener class:
public interface DialogSingleButtonListener {
public abstract void onButtonClicked(DialogInterface dialog);
}
And use it like:
service.isCorrectPin(context, title, message, btnPositive
new DialogSingleButtonListener() {
#Override
public void onButtonClicked(DialogInterface dialog) {
//code here is only called if they entered a correct pin.
}
}
);
A dialog can't "return" a value in the way that it looks like you're expecting. A dialog can make changes to some other object, but you can't have a bit of code block on it and wait for the user to finish interacting with it.
Instead, you'll need to set up listeners for when the prompt dialog is dismissed or buttons or clicked, or whatever other event signals that you have what you need from it. Those listeners can then read the data gathered and set by the dialog.
this is how i'm doing :
public Boolean showAlert(String message)
{
action = false;
AlertDialog.Builder alertDialog = new AlertDialog.Builder(HAActivity.this);
// Setting Dialog Title
alertDialog.setTitle(getString(R.string.app_name));
// Setting Dialog Message
alertDialog.setMessage(message);
// Setting Icon to Dialog
// Setting Positive "Yes" Button
alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
// Write your code here to invoke YES event
action = true;
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("Cancle", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to invoke NO event
action = false;
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
return action;
}
and calling function like this :
//activity in which you create function
if (Activity.showAlert("Do you really want to delete ??"))
{
//delete it anyway.
}