Develop Reference

How to check for hold click Android studio/java

I want to make in my app when I hold click it does something and when I release the button it does something else. A variable will change to true when I hold and false when I release. How do I do that
(Android Studio)
Thanks

You have to use TouchListener and MotionEvent class. The MotionEvent class has Fields ACTION_UP, ACTION_DOWN, and ACTION_MOVE. You can use the getAction() method of the MotionEvent class.
Something like this
findViewById(R.id.btn).setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// button pressed
} else if (event.getAction() == MotionEvent.ACTION_UP) {
// button relased.
}
return false;
}
});

You can use the onTouchListener for your use case:
boolean isClicking = false;
myView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// the view is pressed
isClicking = true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
// the view is released.
isClicking = true;
}
return false;
}
});

Make onTouchListener to update?

I haven't seen an answer for what I am trying to do. I want to update code for as long as I am pressing down on a button and when I let go, the code stops updating. Any advice helps please. Here's my code:
forward.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// Code updates every frame
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP){
// Code stops updating
return true;
}
return true;
}
});

Here is the example:
button1.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
text1.setText("Text1");
} else if (event.getAction() == MotionEvent.ACTION_UP) {
text1.setText("Text2");
}
return true;
}
});

Android image fade animation

When I'd ran this code, it did nothing, I'm sure that this event is called when I touch the button. but It doesn't change the opacity of imageView.
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
ObjectAnimator fadeAltAnim = ObjectAnimator.ofFloat(R.id.imgTest, "alpha", 0.2f);
fadeAltAnim.start();
}
};
findViewById(R.id.dummy_button).setOnTouchListener(mDelayHideTouchListener);
Is there anything wrong with my code?

Try this code, its using ViewPropertyAnimator :
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
view.animate().alpha(0.2f).setDuration(1000);
}
};
Its always good to set a duration, so the Animation knows how long its supposed to run.
EDIT : You might want to attach it to a MotionEvent if you are using onTouchListener , something like :
View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if(motionEvent == MotionEvent.ACTION_DOWN)
view.animate().alpha(0.2f).setDuration(1000);
}
};
EDIT 2 :
If you want to use a Button its best to use an OnClickListener instead of onTouchListener, if you want to attach an Image you have to initiate it(for example in an ImageView) :
Button button = (Button) findViewById(R.id.your_button);
ImageView imageView = (ImageView) findViewById(R.id.imgTest);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
imageView.animate().alpha(0.2f).setDuration(1000);
}
};

It's because you're passing in an id when the method requires the View. Try passing in the View.
So basically change ObjectAnimator.ofFloat(R.id.imgTest, "alpha", 0.2f); to ObjectAnimator.ofFloat(view, "alpha", 0.2f);
Here's an example
findViewById(R.id.image).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ObjectAnimator fadeAltAnim = ObjectAnimator.ofFloat(v, "alpha", 0.2f);
fadeAltAnim.start();
}
});

Is there any reason you're using ObjectAnimator? Can you do:
AlphaAnimation anim = new AlphaAnimation(startAlphaValue, endAlphaValue);
anim.setDuration(duration);
view.startAnimation(anim);

**try this**
public class Animationtest extends Activity {
private ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
imageView = (ImageView)findViewById(R.id.text);
setAnimation();
}
private void setAnimation(){
imageView.setOnTouchListener(new OnTouchListener() {
#SuppressLint("ClickableViewAccessibility")
#Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "touch", Toast.LENGTH_LONG).show();
ObjectAnimator fadeAltAnim = ObjectAnimator.ofFloat(imageView, "alpha", 0.2f);
fadeAltAnim.start();
return false;
}
});
}
}

JAVA / Android - Ontouchstart instead of onClick

We have an onClick function on our relativeLayout but the method triggers when we release our finger from the screen (onTouchEnd). We want our function to trigger on the moment my finger touches the screen.
android:clickable="true"
android:onClick="click"
public void click(View v){
releaseItem();
}

Use View.setOnToucListener(listener)
yourRelativeLayout.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
//Your stuff here
return true;
}
return false;
}
});

How to set up an onTouchListener that changes an ImageView image resource?

I want to setup up an onTouchListener that changes an ImageViews image resource on ACTION_UP and ACTION_DOWN. Here is my code:
// Setup a basic upDownListener that registers UP and DOWN actions and changes the
// view image resource accordingly
View.OnTouchListener upDownListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
// Button was pressed, change button background
v.setImageResource(R.drawable.button_white_pressure);
return true;
} else if(event.getAction() == MotionEvent.ACTION_UP) {
// Button was released, reset button background
v.setImageResource(R.drawable.button_white);
return true;
}
return false;
}
};
This code does not compile because View does not have the method setImageResource, only ImageView. But how do I tell the listener that an ImageView is being used?

Cast the incoming View to an ImageView.
Sample code:
#Override
public boolean onTouch(View v, MotionEvent event) {
ImageView iv = (ImageView) v;
if (event.getAction() == MotionEvent.ACTION_DOWN) {
iv.setImageResource(R.drawable.button_white_pressure);
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
iv.setImageResource(R.drawable.button_white);
return true;
}
return false;
}

View.OnTouchListener upDownListener = new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
ImageView v = (ImageView) v;
if(event.getAction() == MotionEvent.ACTION_DOWN) {
// Button was pressed, change button background
v.setImageResource(R.drawable.button_white_pressure);
return true;
} else if(event.getAction() == MotionEvent.ACTION_UP) {
// Button was released, reset button background
v.setImageResource(R.drawable.button_white);
return true;
}
return false;
}
};