我正在尝试使用Xamarin和Datawedge制作应用程序，但我遇到了很多困难。
首先，我试过这样：
[Activity(Label = "Scanner.App", Icon = "@drawable/icon", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Portrait)]
[IntentFilter(new string[] { "barcodescanner.RECVR" }, Categories = new[] { Intent.CategoryDefault })]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
// This intent string contains the source of the data as a string
private static string SOURCE_TAG = "com.motorolasolutions.emdk.datawedge.source";
// This intent string contains the barcode symbology as a string
private static string LABEL_TYPE_TAG = "com.motorolasolutions.emdk.datawedge.label_type";
// This intent string contains the captured data as a string
// (in the case of MSR this data string contains a concatenation of the track data)
private static string DATA_STRING_TAG = "com.motorolasolutions.emdk.datawedge.data_string";
// Intent Action for our operation
private static string ourIntentAction = "barcodescanner.RECVR";
// Let's define the API intent strings for the soft scan trigger
private static String ACTION_SOFTSCANTRIGGER = "com.motorolasolutions.emdk.datawedge.api.ACTION_SOFTSCANTRIGGER";
private static String EXTRA_PARAM = "com.motorolasolutions.emdk.datawedge.api.EXTRA_PARAMETER";
private static String DWAPI_TOGGLE_SCANNING = "TOGGLE_SCANNING";
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
private void handleDecodeData(Intent i)
{
// check the intent action is for us
if (i.Action.Equals(ourIntentAction))
{
// define a string that will hold our output
String Out = "";
// get the source of the data
String source = i.GetStringExtra(SOURCE_TAG);
// save it to use later
if (source == null) source = "scanner";
// get the data from the intent
String data = i.GetStringExtra(DATA_STRING_TAG);
// let's define a variable for the data length
int data_len = 0;
// and set it to the length of the data
if (data != null) data_len = data.Length;
// check if the data has come from the barcode scanner
if (source.Equals("scanner"))
{
// check if there is anything in the data
if (data != null && data.Length > 0)
{
// we have some data, so let's get it's symbology
String sLabelType = i.GetStringExtra(LABEL_TYPE_TAG);
// check if the string is empty
if (sLabelType != null && sLabelType.Length > 0)
{ // format of the label type string is LABEL-TYPE-SYMBOLOGY
// so let's skip the LABEL-TYPE- portion to get just the symbology
sLabelType = sLabelType.Substring(11);
}
else
{
// the string was empty so let's set it to "Unknown"
sLabelType = "Unknown";
}
// let's construct the beginning of our output string
Out = "Source: Scanner, " + "Symbology: " + sLabelType + ", Length: " + data_len.ToString() + ", Data: ...\r\n";
}
}
// check if the data has come from the MSR
if (source.Equals("msr"))
{
// construct the beginning of our output string
Out = "Source: MSR, Length: " + data_len.ToString() + ", Data: ...\r\n";
}
// we need to put the edit box text into a spannable string builder
SpannableStringBuilder stringbuilder = new SpannableStringBuilder();
// add the output string we constructed earlier
stringbuilder.Append(Out);
// now let's highlight our output string in bold type
//stringbuilder.SetSpan(new StyleSpan(Typeface.DefaultBold), et.Text.Length, stringbuilder.Length, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
// then add the barcode or msr data, plus a new line, and add it to the string builder
stringbuilder.Append(data + "\r\n");
}
}
protected override void OnNewIntent(Intent intent)
{
handleDecodeData(intent);
}
当我扫描某些东西时，导致我遇到困难的是什么，onCreate被调用，导致我的应用程序的新实例，这是不正常的。通常应该调用OnNewIntent，但从未触发过。{/ p>
第二次尝试这个问题就像这样
[Activity(Label = "Scanner.App", Name ="com.creonis.scanner.MainActivity", Icon = "@drawable/icon", MainLauncher = true,
ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, ScreenOrientation = ScreenOrientation.Portrait)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
ScanReceiver _broadcastReceiver = new ScanReceiver();
global::Xamarin.Forms.Forms.Init(this, bundle);
var my_application = new App();
_broadcastReceiver.scanDataReceived += (s, scanData) =>
{
};
// Register the broadcast receiver
IntentFilter filter = new IntentFilter(ScanReceiver.IntentAction);
filter.AddCategory(ScanReceiver.IntentCategory);
this.RegisterReceiver(_broadcastReceiver, filter);
LoadApplication(my_application);
}
[BroadcastReceiver(Enabled = true)]
public class ScanReceiver : BroadcastReceiver
{
// This intent string contains the source of the data as a string
private static string SOURCE_TAG = "com.motorolasolutions.emdk.datawedge.source";
// This intent string contains the barcode symbology as a string
private static string LABEL_TYPE_TAG = "com.motorolasolutions.emdk.datawedge.label_type";
// This intent string contains the captured data as a string
// (in the case of MSR this data string contains a concatenation of the track data)
private static string DATA_STRING_TAG = "com.motorolasolutions.emdk.datawedge.data_string";
// Intent Action for our operation
public static string IntentAction = "barcodescanner.RECVR";
public static string IntentCategory = "android.intent.category.DEFAULT";
public event EventHandler<string> scanDataReceived;
public override void OnReceive(Context context, Intent i)
{
// check the intent action is for us
if (i.Action.Equals(IntentAction))
{
// define a string that will hold our output
String Out = "";
// get the source of the data
String source = i.GetStringExtra(SOURCE_TAG);
// save it to use later
if (source == null)
source = "scanner";
// get the data from the intent
String data = i.GetStringExtra(DATA_STRING_TAG);
// let's define a variable for the data length
int data_len = 0;
// and set it to the length of the data
if (data != null)
data_len = data.Length;
// check if the data has come from the barcode scanner
if (source.Equals("scanner"))
{
// check if there is anything in the data
if (data != null && data.Length > 0)
{
// we have some data, so let's get it's symbology
String sLabelType = i.GetStringExtra(LABEL_TYPE_TAG);
// check if the string is empty
if (sLabelType != null && sLabelType.Length > 0)
{
// format of the label type string is LABEL-TYPE-SYMBOLOGY
// so let's skip the LABEL-TYPE- portion to get just the symbology
sLabelType = sLabelType.Substring(11);
}
else {
// the string was empty so let's set it to "Unknown"
sLabelType = "Unknown";
}
// let's construct the beginning of our output string
Out = "Scanner " + "Symbology: " + sLabelType + ", Length: " + data_len.ToString() + ", Data: " + data.ToString() + "\r\n";
}
}
// check if the data has come from the MSR
if (source.Equals("msr"))
{
// construct the beginning of our output string
Out = "Source: MSR, Length: " + data_len.ToString() + ", Data: " + data.ToString() + "\r\n";
}
if (scanDataReceived != null)
{
scanDataReceived(this, Out);
}
}
}
}
这导致我在扫描某些东西时没有发生任何问题。
有人能指出我正确的方向，因为我不想尝试。