The problem is that I have an Android app that doesn't seem to show the xml layout when I put this while loop into the class file. The loop is as follows:
while(!clicked){
button_a.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
player= MediaPlayer.create(GameActivity.this, R.raw.a);
player.start();
clicked = true;
letterTapped = 0;
}
});
}
The whole project works completely fine without it so I'm pretty sure that there must be something wrong with the loop that I am overlooking.
If you want me to put any other bits of code up here I will be more than happy to.
To stop listening as soon as the button is pressed, you can use this code:
button_a.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
player= MediaPlayer.create(GameActivity.this, R.raw.a);
player.start();
letterTapped = 0;
// Ignore further clicks
button_a.setOnClickListener(null);
// Disable button so the user knows that he can't click again
button_a.setEnabled(false);
}
});
Related
I added the following lines of Code into my OnCreate method.My goal is to assign a button to two functions and to call them up alternately. With the first click the text of the button should be changed and the EditText should be editable. At the second click, the fields should no longer be editable and the button text should change to the first alternative. I have implemented two OnClickListeners and the program structure seems logical to me. Nevertheless, I get an error message; "Cannot resolve symbol onClickListener". What can I do to get the setup described above up and running? Thanks for all responses!
private Button ProfilUpdate;
ProfilUpdate=findViewById(R.id.buttonProfilUpdate);
.
.
.
.
final ProfilUpdate.OnClickListener listener2 = new View.OnClickListener() {
#Override
public void onClick(View v) {
ProfilUpdate.setText("Profil bearbeiten");
profilVorname.setFocusable(false);
}
};
ProfilUpdate.OnClickListener listener1 = new View.OnClickListener() {
#Override
public void onClick(View v) {
ProfilUpdate.setText("Änderungen speichern");
profilVorname.setFocusable(true);
v.setOnClickListener(listener2);
}
};
ProfilUpdate.setOnClickListener(listener1);
why don't you create a boolean isFirstClick = true , and then check it in the same listener
ProfilUpdate.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if(isFirstClick){
//Do the job for the first click process
isFirstClick= false;
}else {
//Do the job for the second click process
isFirstClick= true;
}
}
};
ProfilUpdate.setOnClickListener(listener);
There can only be one click listener on one view at a time. Use ProfileUpdate.setOnClickListener(listener object). To get the alternate functionality, you can define a Boolean to keep track of the state, for the example, define a class variable at the top Boolean shouldChangeText = true, and in the onClick body in the listener, do something like:
If (shouldChangeText) { // change the text
}
else { // clear the text
}
shouldChangeText = !shouldChangeText
I have an app that consists of 3 Activities
MainActivity
CalculatorActivity
InformationActivity
My MainActivity has a confirm button that onClick starts the CalculatorActivity and everything is done correct and working as intended.
CalculatorActivity has 2 buttons, one calculateButton that checks something and shows a message and a learnMorebutton that starts the InformationActivity.
When I am on the
CalculatorActivity for the first time everything is fine and working.Pressing the learnMoreButton navigates me to the InformationActivity.That activity looks like this :
InformationActivity:
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
switchActivity();
}
});
}
public void switchActivity(){
final Intent intentObj = new Intent(this,CalculatorActivity.class);
startActivity(intentObj);
}
A goBack button that gets me back to CalculatorActivity.Going back seems to break the functionality.Although the layout is there and everything looks as it should be, pressing the buttons (calculateButton,learnMoreButton) does nothing.
CalculatorActivity :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
final Button calculateButton = (Button) findViewById(R.id.calculateId);
final Button learnMoreButton = (Button) findViewById(R.id.learnMoreButtonId);
there are some more TextView and EditText that dont show up here but you get the point.Some more methods that do the calculations ,getters and setters.
This method
public void switchActivity(){
final Intent intentObj = new Intent(this,Information_activity.class);
startActivity(intentObj);
}
But I am not using onResume() , onPause() or any methods from the lifecycle apart from onCreate().
From some search that I have done I found out that I am doing something wrong with how I manage the activity lifecycle but I still can't find the solution.The dev documents didn't help me that much and a post with kinda the same problem as mine is old.
My question is, how the navigation from InformationActivity to CalculatorActivity should be done, so the functionality doesn't break when CalculatorActivity comes back to interact with the user.Which method should be called onResume()? , onRestart()? and how should it look like?
Thanks anyone who is willing to help.
P.S: As I mentioned , I have read the documents for the lifecycle of an Activity but I haven't found the solution.
instead of starting new activity everytime, finish the informationactivity.
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
You are creating too much activities moving going back and forth this way. You can use either destroy the activity with finish(); or you can also go back to previous activity using onBackPressed();
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
Try this out
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
InformationActivity.this.finish();
}
});
}
Instead of saying where to go back, you can just finish the activity and it will automatically switch you to the previous one.
I think your activities are hierarchical thus you should be able to do the following from your main calculator activity:
Intent i = new Intent(this, InformationActivity.class);
startActivityForResult(i);
Your back button add this code:
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setResult(Result.OK);
finish();
}
});
You are all suggesting the same thing.Adding
Information_Activity.this.finish()
fixed the broken functionality , though you are all correct I can pick only one answer.
Thanks
I need to perform an action after onClick method of OnClickListener has run.
Here is my code for onClickListener:
View.OnClickListener imgButton0Handler0 = new View.OnClickListener() {
int identifier=0;
public void onClick(View v) {
//check if tile is found and return if it is
if(isFound[identifier]==true) return;
//set tile as open
checkField[identifier]=1;
//set background on predetermined
button0.setBackgroundResource(tiles[identifier]);
}
};
After this has run, and the background is set I would like to call a method checker(int identifier) which will check for other open tiles and change backgrounds accordingly.
This method needs to be run separately because the background is only displayed after onClick finishes, and I need predetermined background shown for a short time before checker method changes it to something else.
How can I accomplish this?
Have You Tried Post Delayed see this,
View.OnClickListener imgButton0Handler0 = new View.OnClickListener() {
int identifier=0;
public void onClick(View v) {
//check if tile is found and return if it is
if(isFound[identifier]==true) return;
//set tile as open
checkField[identifier]=1;
//set background on predetermined
button0.setBackgroundResource(tiles[identifier]);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
// This method will be executed once the timer is over
// Start your app main activity
checker(identifier) // your method call
}
}, 3000); // 3 second
}
};
I have a android project that generates random numbers as the button's text. If you click a button the value of the corresponding button should be displayed in the edittext.
I am already getting the value of the buttons and also able to display it in the edittext. I have 12 buttons and 2 edittexts. What I want is, if I will do the first click then first value will display in the first edittext and in the second click the value will display in the second edittext.
My problem is that in the first click the value is getting displayed in the 2 edittexts simultaneously. Hope you can help me, here is my code:
b1=(Button)findViewById(R.id.b1);
et1=(EditText)findViewById(R.id.first);
et2=(EditText)findViewById(R.id.second);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
str=((Button)v).getText().toString();
et1.setText(str);
et2.setText(str);
}
});
b1 = one of the buttons.
et1 and et2= the two edittexts.
str = empty string
That doesn't surprise me. You don't distinguish your cases within your onClickListener.
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
str=((Button)v).getText().toString();
// Check which edit text
if(isFirstClick()) {
et1.setText(str);
setFirstClick(false);
} else {
et2.setText(str);
}
}
});
See the 'isFirstClick()' like some kind of pseudo code, maybe you can also check if your first editbox is still empty or something like that.
Both #Averroes and #Sambuca have provided a smiliar solution which should work:
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
str=((Button)v).getText().toString();
if((et1.getText().toString()).equals(""))
et1.setText(str);
else
et2.setText(str);
}
});
In case you can do more than 2 clicks and your requirement is to output to textBox1 on odd clisk and Textbox2 on even click - use a boolean variable.
my app have action bar on top of windows. Where are some buttons. Buttons count and there functions is changing depending on activity user are.
I want to write a class with methods addFirstButton, removeFirstButton and so on.
So i other classes i want to do this:
MyButtons myButtons = new MyButtons();
myButtons.addFirstButton();
So there is everything alright, but how to create a listener button if i want to do this ?
Normally i would do this:
Button backButton = (Button) customNav.findViewById(R.id.back);
backButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(Action_Bar_TestingActivity.this, "BACK", Toast.LENGTH_SHORT).show();
}
});
But i want that this would be in MyButtons class and method somehow would return a listener to that action.
So any ideas if this possible ?
Thanks.
If you're programming an Action Bar, then you can handle its "buttons" in onOptionsItemSelected(). For more information, see here: http://developer.android.com/guide/topics/ui/menus.html
If you are supporting Android 1.6-2.x, you can make a copy of the ActionBarCompat sample app. It will use some of the same XML flags as >=3.x ActionBar, but not all functionality is emulated. You may also consider using Action Bar Sherlock.
If you want to set and get your onClickListeners, you can. Nothing says you have to instantiate the click listener inside the button. But you'll have to do some bookkeeping. At the least, instantiate the listener outside your button array and pass it in.
Here's how I make a standalone click listener:
Button.OnClickListener mTakePicOnClickListener =
new Button.OnClickListener() {
public void onClick(View v) {
dispatchTakePictureIntent(ACTION_TAKE_PHOTO_B);
}
};
And here's where I attach it to a button (trivial example):
private void setBtnListener(
Button btn,
Button.OnClickListener onClickListener ) {
btn.setOnClickListener(onClickListener);
}
(If you want to see what this function really looks like, it's part of the Capturing Photos sample app.)
But I think you can see how you could use this function internal to MyButtons.
Or the hard way to code:
final Button backButton = null;
final LinearLayout navBar = (LinearLayout) customNav.findViewById(R.id.root);
Button addButton = (Button) customNav.findViewById(R.id.add_button);
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
if (backButton == null)
{
backButton = new Button(this);
backButton.setText("Back");
backButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Toast.makeText(Action_Bar_TestingActivity.this, "BACK", Toast.LENGTH_SHORT).show();
}
});
navBar.addView(backButton);
addButton.setText("Remove Back button");
}
{
navBar.removeView(backButton);
backButton = null;
addButton.setText("Add Back button");
}
}
});