I tried to capture key event for android. Here is the source code i tried:
text.setOnKeyListener(new OnKeyListener() {
#Override
public boolean onKey(View view, int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_A){
Toast.makeText(MainActivity.this, "A Pressed!!", Toast.LENGTH_LONG).show();
}
return false;
}
});
But it's doesn't work or show any error.
How can i handle the key event for android keyboard?
Software keyboards don't generate onKey events. Only hardware keyboards do. If you want to see changes from a software keyboard, use a TextWatcher on the view.
So you need to use TextChangedListener, Refer here, based on the text, do your work.
Related
I'm using addTextChangedListener(myTextWatcher) to my editText for some currency format.
There is setText() in afterTextChanged in my TextWatcher.
public void afterTextChanged(Editable s) {
et.removeTextChangedListener(this);
(snipped)
et.setText(someText);
(snipped)
et.addTextChangedListener(this);
}
The problem is that even though holding backspace I can delete only one character. I found that setText in the afterTextChanged makes holding backspace not working.
I don't know the exact mechanism but it seems setText push up backspace.
In addition it seems this doesn't happen in Android 7.0 but happens android 8.0 and 9.0.
Thank you in advance!
Use this to know when the backspace is pressed:
editText.setOnKeyListener(new OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
//You can identify which key pressed buy checking keyCode value with KeyEvent.KEYCODE_
if(keyCode == KeyEvent.KEYCODE_DEL) {
editText.setText(editText.getText().tostring()); // gets the current text and sets it again
}
return false;
}
});
You said it works only once. By doing this if you press it it gives you another chance by setting text again and then you can press backspace only once again.
I'm trying to write text in Canvas. As I need to show the soft keyboard to write text, I added an EditText to my Activity with 0 width. I also implemented a TextWatcher to get the text entered into the EditText. With this trick, I can show the soft keyboard whenever I like with this code :
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(myEditText, InputMethodManager.SHOW_IMPLICIT);
Like this I'm able to know what the user is writing and to write the text inside my Canvas.
Now... this becomes tricky when the user would like to stop writing (or let say, anchor the text in the canvas definitely). What I thought is that he could press 'Enter'. So I tried to implement some way to catch the key events. Without any success so far.
Here is my actual code. This method is called when I would like to start writing. 'edit' is an EditText.
public void handleUp(final Paint myPaint) {
edit.setFocusable(true);
edit.setFocusableInTouchMode(true);
edit.requestFocus();
edit.addTextChangedListener(new Watcher());
edit.setImeOptions(EditorInfo.IME_ACTION_GO);
edit.setOnEditorActionListener(new OnEditorActionListener() {
public boolean onEditorAction(TextView arg0, int arg1, KeyEvent arg2) {
Log.d("MyApp", "key pressed");
Paint localPaint = new Paint();
mCanvas.drawText(edit.getText().toString(), mX, mY, localPaint);
return false;
}
});
edit.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
Log.d("MyApp", "key pressed");
if (keyCode == KeyEvent.ACTION_DOWN) {
Paint localPaint = new Paint();
mCanvas.drawText(edit.getText().toString(), mX, mY, localPaint);
return true;
}
return false;
}
});
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(edit, InputMethodManager.SHOW_IMPLICIT);
}
When I debug my app I never reach check points that I have put on my Log() and can't see any message in my Logs neither. I have seen many posts on StackOverFlow where this kind of implementation is used by I can't figure out why it fails here.
Thank you
Taken from the documentation:
public void setOnKeyListener (View.OnKeyListener l)
Added in API level 1
Register a callback to be invoked when a hardware key is pressed in this view. Key presses in software input methods will generally not trigger the methods of this listener.
So you should look for another listener.
My best guess would be to use this:
public void setOnEditorActionListener (TextView.OnEditorActionListener l)
Added in API level 3
Set a special listener to be called when an action is performed on the text view. This will be called when the enter key is pressed, or when an action supplied to the IME is selected by the user. Setting this means that the normal hard key event will not insert a newline into the text view, even if it is multi-line; holding down the ALT modifier will, however, allow the user to insert a newline character.
But none of the methods I could see in the documentation mentioned anything about soft key input.
You override the dispatchKeyEvent to get the Enter key
#Override
public boolean dispatchKeyEvent(KeyEvent event)
{
if (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)
{
// Do whatever you want
}
return super.dispatchKeyEvent(event);
}
Okay so finally the reason nothing worked was because my EditText had a width of 0. When I put width and height to 1. Setting visibility to View.INVISIBLE doesn't work in this case.
By the way, the three Listener (OnEditorActionListener, OnKeyListener and Overriding dispatchKeyEvent) get the callbacks. But I'll use OnEditorActionListener because it's the only one getting only one callback. The two others get several callbacks which is problematic.
I would like to disable the virtual key pad that appears when the focus falls on a edit text element.
I've tried it with the following code:
((EditText)findViewById(R.id.EditTextYears)).setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
return false;
}
});
This works partially. The virtual key pad doesn't appear, but I can't focus on the edit text element as well, which I need to be able to do.
probably this should help
http://www.androidpeople.com/android-hide-virtual-keyboard-through-code/
I have 14 edittext boxes that a user can change at will. When the text is changed in one of them, a softpad key press on the 'enter/next/done' key should re-run a calculation using the new text. I've tried onKey listener but it doesn't work on the soft keyboard, on;y the hard keypad. I've tried a textwatcher like onTextChanged but it reacts and runs the calculation when only a single digit is entered, before the user can input a two or more digit number. So... I hear the onEditorActionListener works on soft keypads to watch for the keypress, but I can't get the syntax right. Here's what I have:
In the onCreate method:
myEdittext1.setOnEditorActionListener(this);
...
myEdittext14.setOnEditorActionListener(this);
Then, outside the onCreate method, I have:
#Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
{ if (event.getKeyCode() == KeyEvent.FLAG_EDITOR_ACTION)
{ //do my calcs}
}
return(true);
}
The code gives me the foreced-close business. Any help would be greatly appreciated.
KeyEvent can be null. You need to check for this situation in your listener.
v The view that was clicked.
actionId Identifier of the action. This will be either the identifier you supplied, or EditorInfo.IME_NULL if being called due to the enter key being pressed.
event If triggered by an enter key, this is the event; otherwise, this is null.
onEditorAction is the appropriate way to listen for finish and Done soft keyboard actions.
so here's a working version:
#Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
{ if (event == null || event.getAction()==KeyEvent.ACTION_UP)
{ //do my calcs
return(true);//reset key event for next press
}
}
The enter key returns a 'null' in the event variable, thats why my version at the top of this post crashed.
Nick's code above worked well too, just remember to set the xml property android:imeOptions=actionDone" for all of the edittext boxes.
If (in Android) I have an EditText box, how can I trigger an event when the user has finished entering data and hits return/Next?
I have tried using the code below but it seems to have no effect. I also get an 'The method onEditorAction(EditText, int, KeyEvent) from the type new extView.OnEditorActionListener(){} is never used locally' error.
myEditText.setOnEditorActionListener(new EditText.OnEditorActionListener() {
public boolean onEditorAction(EditText v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_NEXT)
{
I played around a bit with various things and found that the code below works:
myEditText.setOnEditorActionListener(new OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
// Do some stuff
}
});
I believe you want is the setOnEditorActionListener() method, dev guide info here on the method.
Add a KeyListener to the textbox that listens key events. Within the key event, listen to the "ENTER" key pressed and perform your action.
You can find something similar here: Android Development: How To Use onKeyUp? and in the docs for UI-Events.
A good example is in the linked SO question. Following this, you should get the desired result.