i have implemented onClickListener and the main activity of my app in a separate classes. The main classes contains some buttons and some edittext, and when the user press a cancel button, the edittext hint should be reset.
main activity
public ButtonListener(Context cx , Button b, EditText f) {
cntx = cx;
button = b;
et = f;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//check wich button was pressed
if(button.getId() == R.button.button_cancel) {
et.setHint(R.string.et_nome);
}
else {
//operations for other buttons
But it doesn't work. When i press cancel, the edittext it's not erased.
In the main activity i've call the button with
Button b = (Button)findViewById(R.button.button_cancel);
and set the listener
b.setOnclickListener(new ButtonListener(this, b, edittext));
what's wrong?
Try to set the text of it blank:
et.setText(" ");
You can view other methods here.
Another way you handle this is by hiding the button to eliminate it temporarily. Check out this thread.
You should change:
if(button.getId() == R.button.button_cancel)
to:
if(v.getId() == R.button.button_cancel)
so that the code checks the identifier of the element that raised the click event, not your member variable button.
Related
I have a method which on button click needs to perform in a specific way and if no button is clicked, it should alternatively act differently.
Basically on clicking on the button, it should destroy my service. And if I don't click on it, it will eventually be destroyed. The thing is that I want the destroy method act differently based on these 2 scenarios.
You could add the clicked View as method argument:
myOnClick(View view){
if(view != null){
//Button was clicked
....
}else{
//No Button was clicked
.....
}
}
Is the method performing periodically? Then just add a bool to see if the button was clicked before.
like:
Main:
boolean clicked = false;
onCreate:
Button b = (Button)findViewById(R.id.buttonName);
b.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if(clicked){
clicked = false;
}else{
clicked = true;
}
});
}
I am beginner to Android development. I have 3 edit boxes and one "Edit" button. When I launch the activity all the edit boxes should be disabled. When I click on the Edit button all the 3 edit boxes should get enabled and button text should change to "Save". After updating the data in the edit boxes, when I click on the "Save" button, I should be able to send the updated data to the backend.
My problem is how can I make use of a single button for two function "Edit" and "Save".
Please help me.
You can do it this way:
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
String ButtonText = button.getText().toString();
if(ButtonText.equals("Save"){
//code for save
button.setText("Edit");
}
else{
//code for edit
button.setText("Save");
}
}
});
If I were you I would actually use two buttons one for edit, and one for save. Make them the same size and in the same position, when you want to switch between them make one invisible, and the other visible. Doing it that way would let you keep your onClickListeners separate which would make your code more understandable in my mind.
That being said you could technically achieve it with a single button as well. Just change the text on the button when you want to switch between them, and add an if statement into your click listener to check which "mode" your button is currently in to determine which action it should take.
I am not sure there is an easy way to do this or not. but you can sure use different behaviors of button clicks like
// When you press it for long time.
dummyButton.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
return true; // Can do lot more stuff here I am just returning boolean
}
});
// Normal click of button
dummyButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//do lot more stuff here.
}
});
Do it this way :
Make a public boolean variable
public boolean isClickedFirstTime = true;
make your 3 editTexts enabled false in xml and
onClick of your button
#Override
public void onClick(View v) {
if (v.getId() == R.id.edit_button_id) { //whatever your id of button
Button button = (Button) findViewById(R.id.edit_button_id);
if(isClickedFirstTime)
{
edit1.setEnabled(true);
edit2.setEnabled(true);
edit3.setEnabled(true);
butt.setText("Save");
isClickedFirstTime = false;
}
else
{
....//Get your values from editText and update your database
isClickedFirstTime = true;
}
}
In my application when I click an EditText, I have to perform some logic. I have the code. But it is not going into the click method.
My code:
EditText des=(EditText)findViewById(R.id.desinc);
des.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
java.lang.System.out.println("Inside click");
EditText income=(EditText)findViewById(R.id.editText1);
// TODO Auto-generated method stub
String inc=income.getText().toString();
int indexOFdec = inc.indexOf(".");
java.lang.System.out.println("index="+indexOFdec);
if(indexOFdec==0)
{
java.lang.System.out.println("inside index");
income.setText(inc+".00");
}
}
});
What am I doing wrong? Help me.
Try overriding onTouch by setting up an onTouchListener in the same way as an onClickListener. Use this code as a reference.
EditText dateEdit = (EditText) findViewById(R.id.date);
date.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
//anything you want to do if user touches/ taps on the edittext box
}
return false;
}
});
UPDATE(why this behavior):
The first click event focuses the control, while the second click event actually fires the OnClickListener. If you disable touch-mode focus with the android:focusableInTouchMode View attribute, the OnClickListener should fire as expected.
You can also try this: set android:focusableInTouchMode="false" for your EditText box in the xml. See if it works with the existing code.
You should use OnFocusChangeListener()
Try clicking EditText twice because at first instance EditText gets focus and after that EditText's click event executes. So, if you want your code to execute on first click write your code for focus change of EditText using OnFocusChangeListener().
In one of my activities I have three EditTexts and an OK button. The OnFocusChangeListener is set to all three EditTexts. The listener should trigger every time the focus is lost.
Switching between EditTexts works perfectly. But if the user presses the OK button there's no focus change (losing the focus) triggered for the EditText the user focused before pressing the button.
What's wrong with my code?
private class MyOnFocusChangeListener implements OnFocusChangeListener {
private EditText editText;
public MyOnFocusChangeListener(final EditText editText) {
super();
this.editText = editText;
}
#Override
public void onFocusChange(final View view, final boolean isFocused) {
if (!isFocused) {
if (editText == editText1) {
// Do a calculation
} else if (editText == editText2) {
// Do another calculation
} else if (editText == editText3) {
// Do a different calculation
}
}
}
}
#Override
public void onCreate(final Bundle bundle) {
// ...
editText1.setOnFocusChangeListener(new MyOnFocusChangeListener(editText1));
editText2.setOnFocusChangeListener(new MyOnFocusChangeListener(editText2));
editText3.setOnFocusChangeListener(new MyOnFocusChangeListener(editText3));
// ...
}
You could try to clear the focus when user click on OK or other button....
e.g.
builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
editText1.clearfocus();
editText2.clearfocus();
editText3.clearfocus();
....
}
}
You might want to try using: addTextChangedListener(..) in this case.
Sounds like you could be having issues with touch mode, from the android docs:
"The relationship between touch mode, selection, and focus means you must not rely on selection and/or focus to exist in your application."
To expand on #dong221, and incorporating the comment made by #Harald, one way to clear the focus without having to keep track of the last selected EditText is to get a reference to the currentFocus from the window object. Something like this:
myDoneButton.setOnClickListener { v ->
// Assuming we are in an Activity, otherwise get a reference to the Activity first
window.currentFocus?.clearFocus()
}
It works if you bind onFocusChangeListener to the view element you want to be observed
editText.onFocusChangeListener = this
editText.setOnClickListener(this)
by keyword this it means the ViewHolder class
There are a lot of options on how to define a click/tap on the touchscreen. One of them for example is setting a boolean.
Example for boolean:
boolean buttonClicked = true;
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (buttonClicked) {
//do that and this
}
}
});
And there's a isPressed() method:
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (button.isPressed()) {
//do that and this
}
}
});
What exactly is the difference between them? And when and why do I use boolean and the method isPressed()?
Because you are referring to a button in both of your examples, I assume that you are referring to the user tapping on a button, not just a random touch on the screen.
That being said, both of the examples you provided are not good.
In your first example, the boolean is useless because it is always true, so //do that and this will always be reached.
In your second example, your if statement is useless, because the onClick method by its nature is only reached when the button is tapped.
A good way to listen for a button press is using a click listener like this:
Button button = (Button) findViewById(R.id.buttonId);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Code placed here will run every time the button is tapped
}
});
...where R.id.buttonId is the ID of your button in the layout.
If you need to define click event for a View you can use onClickListener, onTouchListener.
For more information check for Android official Documentation.
onTouchListener
onTouchListener
When considering your first code snippet, You can use boolean to perform another operation on button click event. as example something like this ,
boolean buttonClicked = false;
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//true after button clicked
buttonClicked = true;
}
});
//if buttonClicked equals true
if (buttonClicked){
//perform operation only after button clicked
}
when considering your second code snippet, no need of button.isPressed() inside
button's onClick() callback. Because what you want to do by checking button.isPressed() is done without it inside button's onClick() callback.
Keep in mind these things.
isPressed() is a public method of View Class
Button is a subclass of View Class
isPressed() is a public method of Button Class as well.
About isPressed() from Android official documentation.
Indicates whether the view is currently in pressed state. Unless
setPressed(boolean) is explicitly called, only clickable views can
enter the pressed state.
Returns true if the view is currently pressed, false otherwise.