I have an application, where you can click on the background, and it's changes from the drawables to another background, but I only want to make it clickable when the user click on a button that i call, "I want to click it".
So, how to write a code like:
If user click on button1 2 times, make layout clickable
else
not make layout clickable
So, I want to store somehow the click, and force my app to remember to it, and I also want to count the clicks.
What chapter of Android are helping me understanding this? Thanks for help, and sorry for the noobish question:)
You can have counter that increments on click and then just disable component when counter reach value that you want
int count = 0;
Button button = (Button) findViewById(R.id.i_want_to_click_it);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (++count == 2) {
// make stuff clickable here on 2nd click
}
// if you also want to make things unclickable if there
// are more than 2 clicks, add the else{} condition
else {
// make stuff unclickable here
}
}
});
You can detect when user clicks a button by registering a onClickListener on it. Inside that callback you can count how many times it has been clicked and store that information inside a variable. If your app can change from portrait to landscape mode, dont forget to store the variable in onSavedInstanceState and then retrieve it in onCreate, because changing layout mode will destroy the activity and rebuild it which will reset your variable. I highlighted keywords to search for.
Related
I am using a swipe button from com.ebanx:swipe-button library in my application and I wish to change the state of the swipe button to enable (based on the information recieved via another Bluetooth device) when I open the button's activity. ie: Without any user input I have to change swipe button's state to enable !
You can use toggleState()
SwipeButton mSwipeButton; = findViewById(R.id.my_swipe_button);
mSwipeButton.toggleState();
if you use an older version where toggleState is not available, use collapseButton(); or expandButton(); to collapse or expand the swipe button
There are two issues with the library you're using, first is coding bug, second is wrong documentation, but that's not the case.
to make the button active:
SwipeButton swipe_btn = findViewById(R.id.swipe_btn);
swipe_btn.setEnabled(true);
now by default, the button state is closed and you can change that in the xml file i.e the layout where you created the button, you will see something like below:
<com.ebanx.swipebtn.SwipeButton
app:initial_state="disable" //change to enable will make button open by default
app:has_activate_state="true"
/>
Finally to monitor the state of the button, you will have to listen to the state changes like below:
swipe_btn.setOnStateChangeListener(new OnStateChangeListener() {
#Override
public void onStateChange(boolean active) {
Toast.makeText(MainActivity.this, "IS "+active, Toast.LENGTH_LONG).show();
}
});
if active, the button is open, else it's close.
Note: When I say open, I mean the button is toggledOn, and when I say close, it means the other way round(toggleOff).
The bug here is that when you use swipe_btn.toggleState(); The button will be deactivated, meaning it will not even respond to click event which is not right, so the way around is to use the onStateChangeListener as I use it above so that when the button is open you can do something and when it's close you can still do anything.
Note: library version: 'com.ebanx:swipe-button:0.8.3'
I need to show ripple on my button simply in the onCreate() of my activity. Of all the code I have scanned, ripple effect is only visible when button is pressed. Please guide me on how to show ripple by default without the button click.
You still have to click button but programmatically. Use yourButton.performClick() in your onCreate method and make sure when you do this do not run code that is handle on click event for your button for that you can use one boolean variable to check whether you are doing it programmatically or real action is perform
yourbutton clicklistener {
if(isprogrammatic){
// dont do anything
isprogrammatic = false
}
else{
// run your code
}
}
OnCreate
onCreate(Bundle..){ // your on create method
//yes it is programmatic
isprogrammatic = true;
yourbutton.performClick();
}
First of all i am learning android, I am testing my Andorid app in my Samsung Galaxy S1.
My app Function is: while i am pressing RandomNumber button, it will generate Random numbers and displaying in the screen in TextArea.
But i am facing the below issues.
The Device back button is allow user to go back. How i can avoid that? ( I have buttons defined in the program dynamically, only that Back button should work )
While shaking the phone or change the position of the phone, then the Random numbers are automatically generating. How to avoid that?. Please advise.
Button Creation Dynamic
final Button buttonToAdd = new Button(this);
buttonToAdd.setText("RandomNumber");
Listener:
buttonToAdd.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Strvalue = (String) buttonToAdd.getText();
if (Strvalue.equals("RandomNumber"))
{
Randomnumbergeneration();
}
}
});
You can overwrite the Activities onBackPressed() method to handle the back-button click event.
#Override
public void onBackPressed() {
// put some code here or just do nothing
// don't call super.onBackPressed() if you want to disable the back function
}
But if you want to publish your application you should follow the official design guidelines and do not disable this behaviour because every android user is used to it and will find it unlikely if the back button does not work anymore.
I currently have Button in my main view which checks if users answer is correct.
Button CheckButton= (Button) this.findViewById(R.id.CheckButton);
CheckButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v) {
// some action, setting text
}
});
If button is pressed once it checks if answer is correct, and if button is pressed second time I want it to repeat activity e.g. present user with another question.
OnClickListener is inside onCreate method and question is generated using switch and unique id (for game difficulty).
What would be the best way to set this repeat activity until it's been repeated 4 times. Thanks
switch (difficulty_level)
{
case DIFFICULTY_HARD:
// do this
case DIFFICULTY_EASY:
// do this
}
To me, this doesn't sound like logic belonging in the OnClickListener at all. The listener should simply register the click and then call a function in your activity "handleButtonClicked" that have access to fields that keep track of the number of clicks for the question, if the answer is correct and what the appropiate action is.
The fact that the OnClickListener is set in the onCreate only says that it is ready to be used after OnCreate. It doesn't require the OnCreate to be run again.
Instead of an anonymous inner implementation of OnClickListener, define it as a private class.
That way you can pass the parameter of how many iterations you want in its constructor / setter
Each time the application is launched, increase a counter; when such counter is bigger or equal than the said parameters, ignore the following clicks
You need a global state variable that you set when the click has occured twice, or you could just count and every even number you change the question by loading another activity.
In my app I am trying to calculate an operation using timer. For controlling those operations I am using four buttons as Start, Stop, Pause and resume.
But I want to show only 2 buttons. At the beginning I have only two buttons Start and Pause.
When the start button is clicked timer gets started and immediately in Start button's place I want to show the Stop button.
I want to do the same for the other stop and pause buttons. How to do this please help me......
Using ToggleButton is a good solution for you. Do something like:
ToggleButton first = new ToggleButton(getContext());
ToggleButton second = new ToggleButton(getContext());
first.setTextOff("start");
first.setTextOn("stop");
second.setTextOff("pause");
second.setTextOn("resume");
and use setOnCheckedChangeListener() to implement your actions.
In your onClick(View v), v is the button that gets clicked. You can cast it like:
Button b = (Button) v;
so you can change its text with setText(), and set another listener. You can declare the alternate listeners once as members of the activity, and set them without re-declaring them each time.
Your application needs to maintain states, such as "Idle/Stopped", "In Progress", "Paused", etc. If you want to hide buttons, you can use View.setVisibility, and dynamically show and hide the buttons when your state changes (when other buttons are pressed). You would need to set your layout appropriately so that the buttons display nicely as they are shown/hidden dynamically
Or, you can change the text of the buttons, and their associated click listeners dynamically. This method is not very ideal becuase you may run in to cases where you want different amount of buttons for all your different states, and also, you're associating variable behavior with a single control. Also, you must manage your click listeners, adding and removing them dynamically.
here is a simple implementation
public class Demo extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
button.setText("stop");
}
});
}
}
In the main.xml have a Button widget like this,
<Button android:id="#+id/button"
android:text="start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>