大家好，今天早上遇到这个奇怪的问题。使用摩托罗拉 TC55 (Android)
TC55 具有触发其内置扫描仪的 API。这是通过 Intents 完成的。这就是我一直在寻找的。
- 单击按钮以触发内置扫描仪 - 这会启动扫描条形码并将其返回给活动的意图。
- 返回数据后，将其存储到文本视图中并进行相应处理。
然而，问题是，当意图返回到活动时，onResume 会触发（如预期的那样），但这也会再次触发按钮的 onClick 事件，从而导致扫描仪重复触发。
实际上我的 LogCat 看起来像这样
09-03 12:09:08.089: I/System.out(1128): On resume
09-03 12:09:08.810: I/System.out(1128): Scan button clicked
09-03 12:09:08.820: I/System.out(1128): On resume
09-03 12:09:09.430: I/System.out(1128): Scan button clicked
09-03 12:09:09.440: I/System.out(1128): On resume
09-03 12:09:10.091: I/System.out(1128): Scan button clicked
09-03 12:09:10.111: I/System.out(1128): On resume .......
来到代码：非常感谢任何帮助。
public class ScanTagActivity extends Activity {
// Tag used for logging errors
private static final String TAG = ScanTagActivity.class.getSimpleName();
Context ctx;
ActionBar actionBar ;
GlobalFunctions gF=new GlobalFunctions();
private TextView textViewBarcode = null;
private Button btnImage=null;
info.hoang8f.widget.FButton btnToggle;
Button btnScan;
private String profileName = "PatientTag"; //Normal 2D Scan
private ProfileManager mProfileManager = null;
private EMDKManager emdkManager = null;
ProfileConfig profileConfigObj = new ProfileConfig();
Boolean isImageScanner=false;
// Let's define the API intent strings for the soft scan trigger
private static final String SCANNER_INPUT_PLUGIN = "com.motorolasolutions.emdk.datawedge.api.ACTION_SCANNERINPUTPLUGIN";
private static final String ACTION_SOFTSCANTRIGGER = "com.motorolasolutions.emdk.datawedge.api.ACTION_SOFTSCANTRIGGER";
private static final String ACTION_SETPROFILE = "com.motorolasolutions.emdk.datawedge.api.ACTION_SETDEFAULTPROFILE";
private static final String EXTRA_PARAM = "com.motorolasolutions.emdk.datawedge.api.EXTRA_PARAMETER";
private static final String EXTRA_DATA = "com.motorolasolutions.emdk.datawedge.api.EXTRA_PROFILENAME";
private static final String DWAPI_START_SCANNING = "START_SCANNING";
private static final String DWAPI_STOP_SCANNING = "STOP_SCANNING";
private static final String DWAPI_TOGGLE_SCANNING = "TOGGLE_SCANNING";
private static String ourIntentAction = "com.veeru.labtest.RECVR";
private static final String SOURCE_TAG = "com.veeru.labtest.source";
private static final String DATA_STRING_TAG = "com.motorolasolutions.emdk.datawedge.data_string";
private static final String LABEL_TYPE_TAG = "com.veeru.labtest.label_type";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ctx=this;
getActionBar().setIcon(new ColorDrawable(getResources().getColor(android.R.color.transparent)));
SpannableString s = new SpannableString("Scan Patient Tag - 2D Code");
s.setSpan(new TypefaceSpan( this,"Helvetica-Bold.otf"), 0, s.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
setTitle(s);
setContentView(R.layout.activity_scan_tag);
textViewBarcode = (TextView) findViewById(R.id.txtOutput);
btnToggle=(info.hoang8f.widget.FButton)findViewById(R.id.btnToggleScanner);
btnToggle.setTypeface(gF.getHelvetica(ctx, true));
btnScan=(Button)findViewById(R.id.btnScanB);
btnScan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
System.out.println("Scan button clicked");
int triggerDelay = 250; // delay in milliseconds
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
Intent i = new Intent();
i.setAction(SCANNER_INPUT_PLUGIN);
i.putExtra(EXTRA_PARAM, "ENABLE_PLUGIN");
ScanTagActivity.this.sendBroadcast(i);
i.setAction(ACTION_SOFTSCANTRIGGER);
i.putExtra(EXTRA_PARAM, DWAPI_TOGGLE_SCANNING);
sendBroadcast(i);
}
}, triggerDelay);
}
});
//Intent i = getIntent();
//handleDecodeData(i);
}
@Override
public void onNewIntent(Intent i) {
// set the action to perform
handleDecodeData(i);
}
@Override
protected void onResume() {
System.out.println("On resume");
super.onResume();
Intent iResume = new Intent();
// set the action to perform
iResume.setAction(SCANNER_INPUT_PLUGIN);
iResume.putExtra(EXTRA_PARAM, "DISABLE_PLUGIN");
sendBroadcast(iResume);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
// This method is responsible for getting the data from the intent
// formatting it and adding it to the end of the edit box
private void handleDecodeData(Intent i) {
// check the intent action is for us
if ( i.getAction().contentEquals(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
Integer 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.equalsIgnoreCase("scanner")) {
System.out.println("Intent triggered with data "+data);
// 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";
// now let's update the text in the edit box
textViewBarcode.setText(data);
System.out.println(out);
}
}
// check if the data has come from the MSR
if (source.equalsIgnoreCase("msr")) {
// construct the beginning of our output string
out = "Source: MSR, Length: " + data_len.toString() + ", Data: ...\r\n";
}
}
}
}