I'm trying to launch a specific activity when my phone scans an NFC Tag. This is what my manifest looks like:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lgandroid.ddcnfc"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.NFC"/>
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.lgandroid.ddcnfc.BluePrintActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED"/>
<data android:mimeType="application/com.lgandroid.ddcnfc"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
<activity
android:name="com.lgandroid.ddcnfc.LoginActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.lgandroid.ddcnfc.MainActivity"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lgandroid.ddcnfc.PointDiagnosisActivity"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lgandroid.ddcnfc.PointControlActivity"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lgandroid.ddcnfc.SystemDiagnosisActivity"
android:label="@string/app_name" >
</activity>
<activity android:name="com.lgandroid.ddcnfc.SettingsActivity" android:label="@string/app_name"></activity>
</application>
Whenever I scan my tag, my main activity launches but I'd like my BluePrintActivity to launch. I'm not sure why this is the case. Here is my code for writing to tag:
private boolean writeTag(Tag tag) {
NdefRecord appRecord = NdefRecord.createApplicationRecord("com.lgandroid.ddcnfc");
NdefMessage message = new NdefMessage(new NdefRecord[] { appRecord });
try {
// see if tag is already NDEF formatted
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
nfcTextView.setText("Read-only tag.");
return false;
}
// work out how much space we need for the data
int size = message.toByteArray().length;
if (ndef.getMaxSize() < size) {
nfcTextView.setText("Tag doesn't have enough free space.");
return false;
}
ndef.writeNdefMessage(message);
nfcTextView.setText("Tag written successfully.");
return true;
} else {
// attempt to format tag
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
nfcTextView.setText("Tag written successfully!\nClose this app and scan tag.");
return true;
} catch (IOException e) {
nfcTextView.setText("Unable to format tag to NDEF.");
return false;
}
} else {
nfcTextView.setText("Tag doesn't appear to support NDEF format.");
return false;
}
}
} catch (Exception e) {
nfcTextView.setText("Failed to write tag");
}
return false;
}
Edit: The answer I accepted above hinted me towards the right direction but since I was writing to a tag, the code in the accepted answer is not exactly the correct solution. If you are writing to a tag, this is what you need to do:
NdefRecord appRecord = new NdefRecord(
NdefRecord.TNF_MIME_MEDIA ,
"application/com.lgandroid.ddcnfc".getBytes(Charset.forName("US-ASCII")),
new byte[0], new byte[0]);
NdefMessage message = new NdefMessage(new NdefRecord[] { appRecord });
If you want to store a payload, just replace the last parameter "new byte[0]" to an appropriate data.
The reason your app starts is because you write an Android Application Record to the tag. This causes the application that has a matching package name to start up instead of the filtered activity.
Because you are filtering for a mime type you want to create a Mime Record with type 'application/com.lgandroid.ddcnfc' so instead of
NdefRecord appRecord = NdefRecord.createApplicationRecord("com.lgandroid.ddcnfc");
You should use:
NdefRecord appRecord = NdefRecord.createMimeRecord("application/com.lgandroid.ddcnfc", byteArray);
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