Develop Reference

use a pysical gamepad to operate android application

I need to use a gamepad (physical joystick and button) to opeate my android application. I check the related offical documentation:enter link description here. and my code: but no toast when I connect and operate the gamepad. Do I need other related libraries? I didn't make any set-up action, nor did we set the manifest.
I found that most joystick related examples are virtual joystick on the phone, but in my case, I am connecting a physical gamepad to my android application.
private View.OnKeyListener mCorkyListener = new View.OnKeyListener() {
public boolean onKey(View v, int i, KeyEvent event) {
// do something when the button is clicked
Toast.makeText(getApplicationContext(), event.getKeyCode() ,Toast.LENGTH_SHORT).show();
switch (event.getAction()){
case KeyEvent.ACTION_UP:
break;
case KeyEvent.ACTION_DOWN:
break;
}
return true;
}
};

How to Disable Home Button on Android TV Remote

There are a couple of SO posts that have already discussed similar issues, but I find them not much relevant or too complex. I am working with an Android TV which has a remote controller, and it is supposed to be used in an enterprise environment. Users should not be able to have much control, so I have to restrict some of the functions available on the remote.
I created a simple app that overrides onKeyDown() and displays pressed keys using the following code:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//Read the input and display its code
switch(keyCode) {
case KeyEvent.KEYCODE_HOME:
mTextView.setText("Home");
break;
default:
char c = event.getDisplayLabel();
String code = String.valueOf(keyCode);
String displayText = c + " " + keyCode;
mTextView.setText(displayText);
mTextView.setBackgroundColor(mColor^=Color.GREEN);
}
return true;
}
I am able to capture most of the keys and override their behaviors most notably 131, 132, 133, and 134 (used as Media, TV, Web, and App shortcuts respectively on the remote).
The only problem is the Home button which AOSP source code (KeyEvent.java) says is system-specific:
* This key is handled by the framework and is never delivered to applications. */
public static final int KEYCODE_HOME = 3;
A solution that struck me was to extend KeyEvent and override the method isSystem() to return false when the selected key is KEYCODE_HOME. But, this method is defined final and I cannot override it. Any ideas?

you need to use
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
in your manifest and
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
Toast.makeText(this, ""+event.getKeyCode(), Toast.LENGTH_SHORT).show();
return false;
return super.dispatchKeyEvent(event);
}
i think control home key is 3
i hope was helpful

Codename One - scanning barcodes checking for new line/ENTER character

in Android I can easily detect the ENTER character using the setOnEditorActionListener method so that when a barcode is scanned into a textfield I know when the whole barcode has been read.
[Here is the Android code as requested:]
scanEditText.setOnEditorActionListener(new TextView.OnEditorActionListener()
{
#Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
{
if ( (actionId == EditorInfo.IME_ACTION_DONE) || ((event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN )))
{
System.out.println(" *** ENTER!");
return true;
}
else
return false;
}
});
I have been trying to replicate this in Codename One but with no luck. I have tried
setDoneListener
addDataChangedListener
ActionEvent on the text field and text area
overriding the keyPressed and keyReleased methods
but with no joy. If I set a textField with setSingleLineTextArea(false) I can see the barcode characters appear in the box followed by what I am assuming is a
new line character as the next scan appears on a new line. None of the methods listed seem to catch this event. If I change the focus to another box the ActionEvent is triggered but I don't want to have to move the focus each time.
[Here is the Codenameone code]
gui_searchTextField.setSingleLineTextArea(false);
gui_searchTextField.setDoneListener(new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
Dialog.show("KB", "doneListener " +
gui_searchTextField.getText().trim(), "OK", null);
}
});
gui_searchTextField.addDataChangedListener((evt1, evt2) ->
{
System.out.println("DataChanged " + gui_searchTextField.getText());
});
So, how do I catch the end of the barcode like I can easily in the Android SDK?

Text input is very much a special case for us in all OS's so the keys go directly into the native OS text editing and don't "travel" through Codename One API's. However, DataChangeListener should be invoked for every key input so I'm not sure how this is happening exactly.
I did notice you are using System.out instead of Log.p so you might miss the output from the device related to the changes. Also I would recommend overriding the key pressed/released events and not starting the text editing. Then adding the key value to the text field instead of letting the native input handle it e.g.:
class MyForm extends Form {
public void keyReleased(int key) {
if(isCrLf(key)) {
// do this...
} else {
myTextField.setText(myTextField.getText() + ((char)key));
}
}
}

Device (=keyboard) is sending ASCII (alt+number) to Android

I have external bluetooth device, which is basically something like a keyboard.
But instead of letters and numbers this keyboard is sending data in ASCII.
instead of "0" it will send "alt+48"
instead of "M" it will send "alt+77"
And since Android doesn't have ALT he is is ignoring all received data (=ALT is pressed while receiving letters = I will ignore these letters).
Do you have any idea how to filter out pressed ALT? Or make Android accept send letters with pressed ALT?

override dispatchKeyEvent(KeyEvent event)
and use action KeyAction.ACTION_DOWN else you'll get duplicate data
and then set that add that character in your edit text
edittext.setText(edittext.getText().toString+(char)
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
if(event.getAction()==KeyEvent.ACTION_DOWN) {
int c = event.getUnicodeChar();
if (IS_NEW_RF_ID) {
rfIdAcTv.setText("");
}
}
return super.dispatchKeyEvent(event);
}

Handle barcode scanner value via Android device

I'm trying to handle value from a barcode scanner USB via my Android 3.2 tablet, the scanner is succefuly working in the OS but i want to get the value in the program without a edittext, usbmanager host and accessory did not list it with the connected devices via USB.

most plug in barcode scanners (that I've seen) are made as HID profile devices so whatever they are plugged into should see them as a Keyboard basically. I think this is why they do not show up in the USB host APIs list of accessories. You should be able to get raw input from them the same way you would a keyboard inside your Activity by overriding Activity.onKeyDown(int keycode, KeyEvent ke)
Something like this in your activity:
#Override
protected boolean onKeyDown(int keyCode, KeyEvent event) {
Log.i("TAG", ""+ keyCode);
//I think you'll have to manually check for the digits and do what you want with them.
//Perhaps store them in a String until an Enter event comes in (barcode scanners i've used can be configured to send an enter keystroke after the code)
return true;
}

you will get the result on Activity keydown event.
For Example:-
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
char pressedKey = (char) event.getUnicodeChar();
Barcode += "" + pressedKey;
Toast.makeText(getApplicationContext(), "barcode--->>>" + Barcode, 1)
.show();
return true;
}
Hope this post will help you.

I also had same problem,but when i used onKeyDown or onKeyUp,it was not called every time i mean for every character for barcode.I Used DiapatchKeyEvent,and it worked nice.

public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
Log.i("TAG", event.getCharacters());
return true;
}`