Apps View Control Become Selected Upon Button Trigger

[beachdogvet]

I developed an Android application that scans barcodes using Intents for a Motorola TC70 Touch Computer. The application works and all in that I can scan barcodes and put the scanned data (barcode) to a ListView.

The problem I'm having is that when I trigger a scan using the device's button, the first element in the activity_main gets selected. So for example, I have Menu options. When I push the scan button on the scanner, the options menu becomes selected and the first menu option is displayed.
If I put a Button above the ListView and scan something, then the Button (that's above the Listview) is then selected. I've tried setting focus to the ListView but that didn't work, or I implemented it wrong.

When I remove the Menu Options and button, and have nothing but the ListView in the View, it all works like I would expect it to. It's just when I start putting other controls onto the View that it starts acting goofy by the control becoming selected.

 

[Thom]

Thread moved to forum dedicated to discussing development.

... Thom

 

[Deleted User]

Need to see your code to answer this. Put code in [code] tags

 

[beachdogvet]

Will have to wait until I get home.

 

[beachdogvet]

Need to see your code to answer this. Put code in [code] tags

@override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// The EMDKManager object will be created and returned in the callback.
EMDKResults results = EMDKManager.getEMDKManager(getApplicationContext(), this);

//Check the return status of getEMDKManager
if(results.statusCode == STATUS_CODE.FAILURE)
{
//Failed to create EMDKManager object
}

//Get the textViewBarcode
// textViewBarcode = (TextView) findViewById(R.id.textViewBarcode);

//In case we have been launched by the DataWedge intent plug-in
Intent i = getIntent();
handleDecodeData(i);

scanBeep = MediaPlayer.create(this, R.raw.beep);
alBarCodeList = new ArrayList<>();
// alBarCodeList.add("A friggen barcode");
arrayListAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item,alBarCodeList);
lvBarcodeList = (ListView) findViewById(R.id.lvBarcodeList);
lvBarcodeList.setAdapter(arrayListAdapter);
}

@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.menu_main, menu);

menu.add(0,0,0, "Exit");

return super.onCreateOptionsMenu(menu);

}

@override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case 0:

if (emdkManager != null) {
emdkManager.release();
emdkManager = null;
}
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
break;
}
//return true;
return super.onOptionsItemSelected(item);
}

@override
public void onNewIntent(Intent i) {
handleDecodeData(i);
}

private void handleDecodeData(Intent i)
{
//Check the intent action is for us
if (i.getAction().contentEquals("martin.lockheed.com.scannertc70.RECVR") ) {
//Get the source of the data
String source = i.getStringExtra("com.motorolasolutions.emdk.datawedge.source");

//Check if the data has come from the barcode scanner
if(source.equalsIgnoreCase("scanner"))
{
//Get the data from the intent
String data = i.getStringExtra("com.motorolasolutions.emdk.datawedge.data_string");

//Check that we have received data
if(data != null && data.length() > 0)
{
//Display the data to the text view
// textViewBarcode.setText("Data = " + data);
scanBeep.start();
alBarCodeList.add(data);
arrayListAdapter.notifyDataSetChanged();
// lvBarcodeList.setSelection(0);
}
}
}
}

 

[Robpuk38]

a code tag is like this.. with out the quotes;

"["code"]" your code is in here "["/code"]"

Example with out the quotes

 function user_use_code_tag()
{
console.log("success");
}

 

[beachdogvet]

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// The EMDKManager object will be created and returned in the callback.
EMDKResults results = EMDKManager.getEMDKManager(getApplicationContext(), this);

//Check the return status of getEMDKManager
if(results.statusCode == STATUS_CODE.FAILURE)
{
//Failed to create EMDKManager object
}

//Get the textViewBarcode
// textViewBarcode = (TextView) findViewById(R.id.textViewBarcode);

//In case we have been launched by the DataWedge intent plug-in
Intent i = getIntent();
handleDecodeData(i);

scanBeep = MediaPlayer.create(this, R.raw.beep);
alBarCodeList = new ArrayList<>();
// alBarCodeList.add("A friggen barcode");
arrayListAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item,alBarCodeList);
lvBarcodeList = (ListView) findViewById(R.id.lvBarcodeList);
lvBarcodeList.setAdapter(arrayListAdapter);
}

@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.menu_main, menu);

menu.add(0,0,0, "Exit"); 

return super.onCreateOptionsMenu(menu);

}

@override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case 0:

if (emdkManager != null) {
emdkManager.release();
emdkManager = null;
}
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
break;
}
//return true;
return super.onOptionsItemSelected(item);
}

@override
public void onNewIntent(Intent i) {
handleDecodeData(i);
}

private void handleDecodeData(Intent i)
{
//Check the intent action is for us
if (i.getAction().contentEquals("martin.lockheed.com.scannertc70.RECVR") ) {
//Get the source of the data
String source = i.getStringExtra("com.motorolasolutions.emdk.datawedge.source");

//Check if the data has come from the barcode scanner
if(source.equalsIgnoreCase("scanner"))
{
//Get the data from the intent
String data = i.getStringExtra("com.motorolasolutions.emdk.datawedge.data_string");

//Check that we have received data
if(data != null && data.length() > 0)
{
//Display the data to the text view
// textViewBarcode.setText("Data = " + data);
scanBeep.start();
alBarCodeList.add(data);
arrayListAdapter.notifyDataSetChanged();
// lvBarcodeList.setSelection(0);
}
}
}
}

 

[Deleted User]

To set the focus on your ListView, call

 lvBarcodeList.requestFocus()

(Credit to StackOverflow http://stackoverflow.com/questions/3168247/set-focus-on-any-item-of-listview-in-android)

 

[beachdogvet]

To set the focus on your ListView, call

 lvBarcodeList.requestFocus()

(Credit to StackOverflow http://stackoverflow.com/questions/3168247/set-focus-on-any-item-of-listview-in-android)

That works sometimes. If I run in debug mode and place a breakpoint at the end of the handleDecodeData(Intent i) method, it works. But then if I just run the app from the scanner, it still selects the Menu first.

I did notice in debug mode, before I push the "Continue to Run" green arrow the Menu is highlighted. Then after I push the green arrow, focus is then set to the ListView...as expected. However, as mentioned, once I run the App outside of Android Studio, that setFocus for the ListView doesn't happen.

I'm guessing there's some aysnc processing executing with the EMDK library that I have little or no control of that for whatever reason is doing this.

 

[beachdogvet]

Came up with a solution. It's kinda of a hack, but it works. When the app first starts out, a blank entry is made to the Listview. Then focus is set to the Listview and the first item is highlighted. Scan a barcode, replace the blank entry with the newly read barcode to the list. Subsequent reads are added to the list as expected. It works and is good enough for me.