Develop Reference

Android single button multiple functions

I am beginner to Android development. I have 3 edit boxes and one "Edit" button. When I launch the activity all the edit boxes should be disabled. When I click on the Edit button all the 3 edit boxes should get enabled and button text should change to "Save". After updating the data in the edit boxes, when I click on the "Save" button, I should be able to send the updated data to the backend.
My problem is how can I make use of a single button for two function "Edit" and "Save".
Please help me.

You can do it this way:
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
String ButtonText = button.getText().toString();
if(ButtonText.equals("Save"){
//code for save
button.setText("Edit");
}
else{
//code for edit
button.setText("Save");
}
}
});

If I were you I would actually use two buttons one for edit, and one for save. Make them the same size and in the same position, when you want to switch between them make one invisible, and the other visible. Doing it that way would let you keep your onClickListeners separate which would make your code more understandable in my mind.
That being said you could technically achieve it with a single button as well. Just change the text on the button when you want to switch between them, and add an if statement into your click listener to check which "mode" your button is currently in to determine which action it should take.

I am not sure there is an easy way to do this or not. but you can sure use different behaviors of button clicks like
// When you press it for long time.
dummyButton.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
return true; // Can do lot more stuff here I am just returning boolean
}
});
// Normal click of button
dummyButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//do lot more stuff here.
}
});

Do it this way :
Make a public boolean variable
public boolean isClickedFirstTime = true;
make your 3 editTexts enabled false in xml and
onClick of your button
#Override
public void onClick(View v) {
if (v.getId() == R.id.edit_button_id) { //whatever your id of button
Button button = (Button) findViewById(R.id.edit_button_id);
if(isClickedFirstTime)
{
edit1.setEnabled(true);
edit2.setEnabled(true);
edit3.setEnabled(true);
butt.setText("Save");
isClickedFirstTime = false;
}
else
{
....//Get your values from editText and update your database
isClickedFirstTime = true;
}
}

How other buttons disable when I press the button?

I have a few imageview which have onclicklistener. If I press one (not release), I can press click others or I can click them same time. I do not want it. Everytime when I press one of them others should be disable to click.
imageview1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getMethod();
}
});
I guess, I tried setClickable(false); but it did not work properly, if I clicked one button after that it worked.

Try using onTouchListener instead of onClickListener and calling setEnabled(false); on the other views there. Here's a fairly basic example:
OnTouchListener onTouchListener = new OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
imageView1.setEnabled(false);
imageView2.setEnabled(false);
}
return true;
}
};
And then apply it to the image views with:
imageView1.setOnTouchListener(onTouchListener);
That should work. One thing is, though, that while you'll only be able to push one button no matter what, you also won't be able to push anything after you let go - but, you can fix that by adding some logic to see if the view actually got clicked or if the user touched it, changed their mind and slid away. The (event.getAction() == MotionEvent.ACTION_DOWN) check will be true even if the user is just scrolling.

//button on which press u want to disable others
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
button2.setEnabled(false); //button which u want to disable
button3.setEnabled(false); //button which u want to disable
}
});
//update fixed a spelling error

try to disable the button and
button.setEnable(false);
enable the button
button1.setEnable(true);

Android button onclick multitouch

I have 2 buttons and I need to read onClick event from second button when first is pressed down now and v.v. Like in keyboards. How to do that?
Edit
No, no! I don't need to check was first button clicked or not. I need to listen another onClick events when first or second button is in ACTION_DOWN state couse if I press first button, I can't press second, but I have multitouch.

May be You could try the following code :
Declare a boolean variable in class.
private boolean button1IsPressed = false;
Write following code for button 1 :
button1.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
button1IsPressed=true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
button1IsPressed=false;
}
}
};
For Button 2 You can do the following:
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(button1IsPressed){
//Write your to do code here
}
}
});

You could try with onTouchListeners. In the first button modify a boolean on the down and up event, in the second button, only perform an action when the boolean is true.

If the buttons are toggle buttons, what I think is the case then:
public void onToggleClicked(View view) {
// Is the toggle on?
boolean on = ((ToggleButton) view).isChecked();
if (on) {
// Do something
} else {
// Disable vibrate
}
}
The main thing here is the isChecked() function, which may be used when checking which one is checked, so to execute something then. You can set in the XML of the two buttons the following:
android:onClick="onToggleClicked" then with isChecked determine which one is checked like this:
boolean on1 = ((ToggleButton) view1).isChecked();
boolean on2 = ((ToggleButton) view2).isChecked();
if (on1)
//do something with button2
if (on2)
//do something with button1
Cheers

There's a sample code in android-16/ApiDemos project called "Views -> Splitting Touches across Views" (SplitTouchView.java). In that sample enclosing LinearLayout has an attribute android:splitMotionEvents="true" which allows to scroll two list views simultaneously.
According to Android 3.0 API Overview this attribute appeared in this api version:
Previously, only a single view could accept touch events at one time. Android 3.0 adds support for splitting touch events across views and even windows, so different views can accept simultaneous touch events.

Android: long click on a button -> perform actions

I want to use the same button to perform 2 different methods.
One method when user single clicks it and a second method (different) when the user LONG clicks it.
I use this for the single short click (which works great):
Button downSelected = (Button) findViewById(R.id.downSelected);
downSelected.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
method();
}
}
});
I've tried to add a longClickListener but it didn't work.
Appreciate any ideas on how to solve this.
Thanks!

I've done it before, I just used:
down.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
return true;
}
});
Per documentation:
public void setOnLongClickListener
(View.OnLongClickListener l)
Since: API Level 1 Register a callback
to be invoked when this view is
clicked and held. If this view is not
long clickable, it becomes long
clickable.
Notice that it requires to return a boolean, this should work.

To get both functions working for a clickable image that will respond to both short and long clicks, I tried the following that seems to work perfectly:
image = (ImageView) findViewById(R.id.imageViewCompass);
image.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
shortclick();
}
});
image.setOnLongClickListener(new View.OnLongClickListener() {
public boolean onLongClick(View v) {
longclick();
return true;
}
});
//Then the functions that are called:
public void shortclick()
{
Toast.makeText(this, "Why did you do that? That hurts!!!", Toast.LENGTH_LONG).show();
}
public void longclick()
{
Toast.makeText(this, "Why did you do that? That REALLY hurts!!!", Toast.LENGTH_LONG).show();
}
It seems that the easy way of declaring the item in XML as clickable and then defining a function to call on the click only applies to short clicks - you must have a listener to differentiate between short and long clicks.

Initially when i implemented a longClick and a click to perform two separate events the problem i face was that when i had a longclick , the application also performed the action to be performed for a simple click . The solution i realized was to change the return type of the longClick to true which is normally false by default . Change it and it works perfectly .

Change return false; to return true; in longClickListener
You long click the button, if it returns true then it does the work. If it returns false then it does it's work and also calls the short click and then the onClick also works.

Try using an ontouch listener instead of a clicklistener.
http://developer.android.com/reference/android/view/View.OnTouchListener.html

The simplest and updated method is using a long click listener like
someView.setOnLongClickListener {
//do your work
true
}

Android: What's the difference between a boolean for a click and button.isPressed()?

There are a lot of options on how to define a click/tap on the touchscreen. One of them for example is setting a boolean.
Example for boolean:
boolean buttonClicked = true;
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (buttonClicked) {
//do that and this
}
}
});
And there's a isPressed() method:
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (button.isPressed()) {
//do that and this
}
}
});
What exactly is the difference between them? And when and why do I use boolean and the method isPressed()?

Because you are referring to a button in both of your examples, I assume that you are referring to the user tapping on a button, not just a random touch on the screen.
That being said, both of the examples you provided are not good.
In your first example, the boolean is useless because it is always true, so //do that and this will always be reached.
In your second example, your if statement is useless, because the onClick method by its nature is only reached when the button is tapped.
A good way to listen for a button press is using a click listener like this:
Button button = (Button) findViewById(R.id.buttonId);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Code placed here will run every time the button is tapped
}
});
...where R.id.buttonId is the ID of your button in the layout.

If you need to define click event for a View you can use onClickListener, onTouchListener.
For more information check for Android official Documentation.
onTouchListener
onTouchListener
When considering your first code snippet, You can use boolean to perform another operation on button click event. as example something like this ,
boolean buttonClicked = false;
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//true after button clicked
buttonClicked = true;
}
});
//if buttonClicked equals true
if (buttonClicked){
//perform operation only after button clicked
}
when considering your second code snippet, no need of button.isPressed() inside
button's onClick() callback. Because what you want to do by checking button.isPressed() is done without it inside button's onClick() callback.
Keep in mind these things.
isPressed() is a public method of View Class
Button is a subclass of View Class
isPressed() is a public method of Button Class as well.
About isPressed() from Android official documentation.
Indicates whether the view is currently in pressed state. Unless
setPressed(boolean) is explicitly called, only clickable views can
enter the pressed state.
Returns true if the view is currently pressed, false otherwise.