Develop Reference

How to make an app which will not listen to touch events

How to make an app which will not listen to touch events and back/home pressing but will listen only to the power button.
I've tried this but it wasn't successful.
#Override
public boolean onKeyDown(int keyCode, android.view.KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_POWER) {
return true;
}else if ((keyCode == KeyEvent.KEYCODE_HOME)|| (keyCode == KeyEvent.KEYCODE_BACK )){
return false;
}
return false;
}

You could wrap you class with a custom View of yours and override its OnClickListener and OnTouchListener methods. Override them with blank methods.
Also, keep your code to set how your app should work when the Power Button is clicked.
For instance, if you wrap your layout with a RelativeLayout or a general View, you could use something like
relativeLayout.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
return false;
}
});
relativeLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
return false;
}
});

To block user touch event try this solution. And if you want to disable back and home try to override this method of Activity:
#Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}

three weeks ago, i want also to catch the home button, but i faied. i do some research, i find the android system don't support to modify it.you can visit this
Overriding the Home button - how do I get rid of the choice?, about homebutton.
as for the touchEvent, i advice you can try this method ,override onTouchEvent (if you dont add onTouchListener, make it retrun fasle and do nothing, at the same time ,the activity also dont handle the onTounEvent or OnClick(whole layout).

button clickable only with a stylus

I have a button that I would like clickable only by a stylus.
I used the method setClickable to enable or disable the click on the button, but how can I do that is clickable only with a pen?
the button should be clickable only when MotionEvent.TOOL_TYPE_STYLUS
how do i can?

you could override the Button's onTouchListener, and return immediately it the touch event is not performed through TOOL_TYPE_STYLUS. To retrieve this information, you can use
getToolType(int pointerX)
From the documentation
Gets the tool type of a pointer for the given pointer index
if it returns TOOL_TYPE_STYLUS, then you can simply check the MotionEvent for the ACTION_DOWN/ACTION_UP, and call performClick(). E.g.
b.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getToolType(0) == MotionEvent.TOOL_TYPE_STYLUS) {
if (event.getAction() == MotionEvent.ACTION_UP ) {
performClick();
return true;
}
}
return false;
}
});

onTouchListener doing action twice

I am trying to make some field with text (no button) what I click on to open datepicker dialog.
I am totally begginer and I am trying it on easy example.
firstbirth.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
Toast.makeText(getApplicationContext(), "ahooj", Toast.LENGTH_LONG).show();
return false;
}
});
firstbirth is spinner, I tried it with Edittext and the result was same.
Can anybody help me?
Thanks in advance!

Use an OnClickListener instead.
setOnClickListener(View.OnClickListener l)
OnTouchListeners will trigger on multiple touch events (like touch down, touch up etc.) whereas the OnClickListener will only get fired once (onClick :) )
If you, for some reason, want to use an OnTochListener you can make sure that its only called once.
Try:
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_UP { // another option would be ACTION_DOWN for example
Toast.makeText(getApplicationContext(), "ahooj", Toast.LENGTH_LONG).show();
return true;
}
return false;
}

Thanks it sounds logical but when I use OnClick event application felt down while initializing.
firstbirth.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
DialogFragment dd1 = new DatePickerFragment();
dd1.show(getFragmentManager(), "Select a date");
}
});
Problem is not with DialogFragment becasue it works when I use onTouch event.
Thanks :)

Keep pressed a button in onClick()

I want to keep a button displayed pressed. I want to use another way instead of onPressed() in onTouch(). I add setPressed(), setSelected() but not worked. when i add these methods in onTouch() the program is good but my animation is very slow.
Can i use these method in onClick() method but works in this?
Please explain for me

Instead of using the onClick-event which returns the button to the non-pressed state, you can set the pressed state in the onTouch-event:
yourbutton.setOnTouchListener(new OnTouchListener()
{
#Override
public boolean onTouch(View v, MotionEvent event)
{
if(event.getAction() == MotionEvent.ACTION_DOWN)
{
((Button) v).setPressed(true);
//TODO: Add the code of your onClick-event here
}
return true;//Return true, so there will be no onClick-event
}
});
If this affects any animation, you should look for the problems there.

This piece of code makes the button work as a toggle button. It sets the pressed property to its opposite.
If the button is pressed, it's set as unpressed.
If the button is unpressed, it's set as pressed.
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
Button b = ((Button) v);
b.setPressed(!b.isPressed());//if pressed, unpress; if unpressed, press
}
return true;
}

What you are describing seems to be a toggle button. Maybe you should check this out, instead of doing a hackish solution :
Toggle Buttons

Extend ToggleButton or:
Button button = (Button) view.findViewById(R.id.button1);
button.setTag(false);
button.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP)
if ((boolean) v.getTag()) {
v.setPressed(false);
v.setTag(false);
return false;
} else {
v.setPressed(true);
v.setTag(true);
return true;
}
return false;
}
});

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?