Develop Reference

How to keep adding while button is pressed?

I'm building a simple counter, it has buttons to add or subtract from a total value, I want it to keep adding if I hold the button, incrementing +5 every second, but i'm having problems to make it work. I'm using onClickListener, but i can't find a way to make it work "together" with on touch listener.
pl.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
lf++;
lt.setText(Integer.toString(lf));
}
}

You will have to use handler to schedule a runnable that increments +5 every 1 second (+1 per 200 milliseconds to keep it smooth)
Handler handler = new Handler();
Runnable incrementTask = new Runnable(){
#Override
public void run(){
lf++;
handler.postDelayed(incrementTask, 200); //Execute after 200 milliseconds
}
};
Then you implement onTouchListener and post this runnable when ACTION_DOWN is dispatched and cancel it when ACTION_UP is dispatched.
boolean buttonPressed = false;
pl.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
//This check is imporant since ACTION_DOWN might be called
// multiple times when finger is moving
if(!buttonPressed){
buttonPressed = true;
handler.post(incrementTask);
}
} else if(event.getAction() == MotionEvent.ACTION_UP){
if(buttonPressed)
{
buttonPressed = false;
handler.cancel(incrementTask);
}
}
return false;
}
});
Please note that this logic won't work well with your current click listener. For better user experience, I would recommend that you start this timer/runnable only when your button is long pressed. I had a similar situation in a project so I wrote a utility class to help me detect when a button is being held and released after a long click. Normal clicks work fine as well. You can find my ClickAndHoldManager class on Github.
To use it, you simply pass your view in the constructor and set a listener:
ClickAndHoldManager manager = new ClickAndHoldManager(myButton);
manager.setClickCallback(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Regular Click
}
});
manager.setHoldCallback(new ClickAndHoldManager.HoldListener() {
#Override
public void holdStarted() {
// do handler.post() here
}
#Override
public void holdEnded() {
//do handler.cancel() here
}
});

How to achieve on first click listener in android?

I have a customView , i want to set onClick which will only be called on the very first click. In which i want to start a thread which will start a counter on other TextView , with simple onClickListener with each click a new threads starts which is a problem . How can i achieve such task ?

Another option is in your onClick() method do set a null listener, i.e.
#Override
public void onClick(View view) {
// disable any other clicks from now on
customView.setOnClickListener(null);
...
}

I think this is only logic problem, So I solve this problem by using a boolean variable for the first click:
boolean isFristClick = true;
#Override
public void onClick(View v) {
if (isFristClick) {
// Start your counter Thread here
isFristClick = false;
} else {
// Do nothing
}
}

What about making a workaround for that?!! like assigning a boolean value to tell if it's the first click:
private boolean first_click = true;
your_view.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(first_click){
first_click = false;
// Do something on first click
}else{
// Do another thing on later clicks
}
}
});

Existing classes are not working in new project with intents

I wrote an app with 1 activity and 1 view, so it gives me the coordinates of my fingers i put on the screen. Worked perfectly.
The Problem is now: I Created a new App with more than 1 Activity so i can change between them with intents. also worked fine. But one Activity should be the one wich give me my finger positions. So i Copyed the class and activity put them into the manifest. And made a Button and a intend for to run it.
So when i try to run it it creates the class but doesnt react on my onTouchEvents anymore...
and i have no clue why. i hope i explained my problem well enough for u guys to understand.
So this is my main activity. starts the menu with the option to go to the not working class
public class V1_2 extends Activity implements OnClickListener{
Button btn_1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_v1_2);
btn_1 = (Button) findViewById(R.id.button1);
btn_1.setOnClickListener(this);
}
public void onClick(View v) {
if( btn_1.getId() == ((Button)v).getId() ){
startActivity(new Intent(this,Obj_recog.class));
}
}
This is now the activity wich creates the touchpiont class for the touchevents
public class Obj_recog extends Activity implements OnClickListener{
touchtest TP;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.blank);
TP = new touchtest(this);
}
public void onClick(View v) {
}
And now an example of what doesnt work here but worked at the last project the same way
public class touchtest extends View{
public touchtest(Context context) {
super(context);
Log.d("worked", "worked");
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
Log.d("Touch", "TOUCH!!!!");
return true;
}
}
So i get the message that it "worked" but it doesnt react on touchevents like it used to do...

It will be worked if you add touchtest view as your main view by using setcontentview and then
add touchlistener on that view and call your ontouchevent from your touchtest class. code will be like --
TP = new touchtest(this);
setContentView(TP);
TP.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
TP.onTouchEvent(event);
return false;
}
});
i think should change this approach find an alternative way to implement for which you are going in this way.
In this way you can keep your blank layout and also TP.
RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
TP = new touchtest(this);
rl.addView(TP);
TP.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
TP.onTouchEvent(event);
return false;
}
});

clicklistener and longclicklistener on the same button?

i am creating a call/dial button, when i click on that call/dial button, a call will be made based on the input that is displayed in the edittext. I managed to do that part. can you guys advise me whether i can do a longer click on that same call/dial button, so that a toast can come out to ask user to choose something else??
I did some research on "setOnLongClickListener" but i am not sure if i can combine it in the same call/dial button? I have attached on the working dial function which i managed to do, wondering if the "setOnLongClickListener" can be combined together somehere in the code?
private void dialANumber() {
try {
buttonCall = (ImageButton) findViewById(R.id.imageButton2);
buttonCall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
if (display != null) {
Intent callNumber = new Intent();
callNumber
.setAction(android.content.Intent.ACTION_CALL);
callNumber.setData(Uri.parse("tel:" + display.getText()));
startActivity(callNumber);
}
}
});
} catch (ActivityNotFoundException anfe) {
Log.e("DialANumber", "Dialing the number failed", anfe);
}
this code is working. i hope a longer click can be made on the same call/dial button so the button can have a normal click to make a call, and longer click to pop out a toast. Thanks in advance.

Note that returning "false" on the long click listener will have the UI responding to the long click as a short click too. Return "true" if you want to kill that off. "True" means "yes, I used this event" and "false" means "whether I used it or not, the environment is free to respond as well." (I know this because I just used AkashG's answer in my own app.)

A GestureDetector with a SimpleOnGestureListener would help you differentiate between the different types of presses. A GestureDectector is a class which can read different types of touch events (for example, single taps and long presses), and sends them to a listener which handles each type differently. Here's the documentation on the Detector and Listener.
http://developer.android.com/reference/android/view/GestureDetector.html
http://developer.android.com/reference/android/view/GestureDetector.SimpleOnGestureListener.html
First, set up your SimpleOnGestureListener, the important methods for you to override will be onSingleTapUp and onLongPress. In your onCreate, create an instance of GestureDetector that references your listener. Then, attach an OnTouchListener to your button that sends the event to your detector. You'll want it to look something like this:
//Set up the Detector
GestureDetector.SimpleOnGestureListener myGestureListener = new GestureDetector.SimpleOnGestureListener()
{
#Override
public boolean onSingleTapUp(MotionEvent e)
{
//Your onClick code
return false;
}
#Override
public void onLongPress(MotionEvent e)
{
//Your LongPress code
super.onLongPress(e);
}
};
//And make a variable for your GestureDetector
GestureDetector myGestureDetector;
...
#Override
onCreate(Bundle b)
{
...
myGestureDetector = new GestureDetector(myActivity.this, myGestureListener);
...
}
...
//And finally, wherever you are setting up your button
button.setOnTouchListener(new View.OnTouchListener(){
#Override
public boolean onTouch(View view, MotionEvent motionEvent)
{
myGestureDetector.onTouchEvent(motionEvent);
return false;
}
There a a bunch of other types of events this class can interpret in case you want to get even more fancy. GestureDetector is a very good class to do a little research on, it can be very useful and isn't too complex. Hope this helps.

Yes you can do this:
XML file:
<Button
android:id="#+id/call"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CALL"/>
<ImageButton
android:id="#+id/callBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher"/>
For button click event:
Button button=(Button) findViewById(R.id.call);
button.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View v) {
Toast.makeText(getBaseContext(), "Long CLick", Toast.LENGTH_SHORT).show();
return false;
}
});
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (display != null) {
Intent callNumber = new Intent();
callNumber
.setAction(android.content.Intent.ACTION_CALL);
callNumber.setData(Uri.parse("tel:" + display.getText()));
startActivity(callNumber);
}
}
});
For imageButton:
ImageButton imageButton=(ImageButton) findViewById(R.id.callBtn);
imageButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if(check==false){
Toast.makeText(getBaseContext(), "CLick", Toast.LENGTH_SHORT).show();
}
imageButton.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View v) {
check=true;
if(check){
Log.d("bool", check+"");
Toast.makeText(getBaseContext(), "Long CLick", Toast.LENGTH_SHORT).show();
check=false;
}
return false;
}
});
Declare this at the top(golbally):
boolean check=false;

How to prevent button onClick firing repeatly?

I have a Button which sets both onLongClickListener & onClickListener :
onLongClickListener :
#Override
public boolean onLongClick(View v) {
do something ...
return true;
}
onClickListener :
#Override
public void onClick(View v) {
do something else ...
}
When I long click the button, onLongClick fires repeatly
(sometimes onClick fires too when I release the button, it's weird ##")
What I want is to make the onLongClick be triggered only once for one long press.
So I modified the code :
onLongClickListener :
#Override
public boolean onLongClick(View v) {
do something ...
myButton.setLongClickable(false);
return true;
}
onClickListener :
#Override
public void onClick(View v) {
myButton.setLongClickable(true);
do something else ...
}
Unfortunately, the onClick callback was locked too after onLongClick fires!
I cant unlock the button anymore :|
Whats wrong with my code? Also, why onClick sometimes works when I release my button after a long click?

I've got the code you need, give me a minute to post it.
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//DO STUFF GRAH!
}
});
btn.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View v) {
//OTHER STUFF
return true;
}
});
This worked fine for me. I made an int and onLongClick added one and displayed it in a toast. Always incremented by one, and didn't do the onClick (reset it to 0).