Develop Reference

Repeatedly performing an action while button is clicked

I have a button that runs a code that changes the background to a random color on each click. I would also like to give the user the ability to keep on changing the background color as long as the button is clicked. I believe that the onTouchListener will be my best bet. However, I do not now how to implement the code correctly.
I tried on the onLongClickListener but found out that onLongClickListener doesn't work that way.
Incomplete code for the onTouchListener (randomize is the name of my button):
randomize.setOnTouchListener(new Button.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
// start the thread
return true;
} else if(event.getAction() == MotionEvent.ACTION_UP){
// stop the thread
return true;
}
return false;
}
});
So, what I aim to be able to do is to keep on pressing the button and having the background continuously change while still preserving the onclick method of the button. So, onclick changes the background once and continuous click changes the background continuously.
Thank you so much folks :)
Ps. I'm just a beginner to android so I'm sorry if I do not know much. :)

try this:
btn.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
count++;
Toast.makeText(getApplicationContext(),Integer.toString(count) , Toast.LENGTH_SHORT).show();
return true;
}
});

OnTouchEvent does not work on Edittext field, is there an alternative?

I have a edittext field which prefilled with the value "comment please..." Now I want to delete this content as soon as the User touches this field. In the documentation I saw that there is the possibility to add an onTouchEvent to a edittext field. But its not working because compiler error occurs with
The method onTouchEvent(MotionEvent) in the type TextView is not applicable for the arguments (new View.OnTouchListener(){})
My code is:
comment.onTouchEvent(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (comment.getText().equals( R.string.comment_content )){
comment.setText( "" );
return true;
}
return false;
}});
thanks

Don't do this manually. Android already provides this functionality: "hint text".

MyEditor.setOnTouchListener(new OnTouchListener(){
#Override
public boolean onTouch(View v, MotionEvent event) {
int inType = MyEditor.getInputType(); // backup the input type
MyEditor.setInputType(InputType.TYPE_NULL); // disable soft input
MyEditor.onTouchEvent(event); // call native handler
MyEditor.setInputType(inType); // restore input type
return true; // consume touch even
}
});
This one is disable your input and set on touch work ..

How to unsubscribe from onTouch() event

When application is started I run a custom pop-up till a user touches the screen. When screen is touched I catch it with event onTouch() and cancel the pop-up. From this point I don't need the event anymore.
The problem is the event is alive and continues to jump up every time a user touches the screen.
Is there any way to unsubscribe from this event? Something like in c# -= eventName.
The code is below:
#Override
public boolean onTouch(View v, MotionEvent event) {
if (!_stopToast)
{
_hintToast.cancel();
_stopToast = true;
}
return false;
}

There's no such method (lets say removeTouchListener or similar) which will help you to remove an already defined touch listener from a view. Setting null to setOnTouchListener won't help too. What you can do is to create a new object reference of OnTouchListener class which does nothing and set it in setOnTouchListener. For example:
public final OnTouchListener dummyOnTouchListener = new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent rawEvent) {
return false;
}
};
And simply use it as below:
yourView.setOnTouchListener(dummyOnTouchListener);

Android turning clicks into touches

I have an on click listener:
whiteKeyPressedArray[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
}}
I see that this allows touches:
public boolean onTouch(View v, MotionEvent event) {
//Switch case for type of touch
}
But how can I detect touch rather than click on my whiteKeyPressedArray[i]?
Thanks!

OnTouch will fire many many times :), actually onTouch will be trigered over and over again as long as you keep your finger to that element (as long as you touch that element). Where onClick will be fire just ones but ONLY if you return false from your onTouch handler.

I don't know what the whiteKeyPressedArray[i] is, but have you tried:
whiteKeyPressedArray[i].setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return true; // or false if you want the event to pass on
}
});
Maybe this is what you are looking for?

Is there anyway to remove an onTouchListener from a view object?

I have an on touch listener for a webview, but it has a bad effect on the functionality of the webview, so I am wondering if there is anyway to removed the on touch listener after the initial interaction?

webView.setOnTouchListener(null);

So in you activity you would set your overridden onTouchListener:
mWebView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
v.setOnTouchListener(mWebView.mOnTouchListener);
return false;
}
});
And you would have to make a new class, extending WebView. And within it you would define an OnTouchListener.
public final OnTouchListener mOnTouchListener = new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent rawEvent) {
return false;
}
};
Setting the ontouchlistener to null doesn't reset it to the default definition. You still have to provide an actual listener.

I was looking for help online and got to this post.
When I did
myView.setOnTouchListener(null);
my myView stopped responding to the onTouch.