我正在尝试阅读NFC标签ID。我知道我无法读取数据,因为它是一个安全的标签(MBTA票价卡)。我想阅读标签唯一ID和吐司那个值。我已成功获得NFC意图工作,因此当扫描标签时,我的应用程序会尝试处理它。但是应用程序不会显示标签为id的祝酒词。
package com.example.nfctest;
import android.nfc.NdefMessage;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.NfcF;
import android.os.Bundle;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;
public class MainActivity extends Activity {
private NfcAdapter mAdapter;
private PendingIntent mPendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
private int mCount = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdapter = NfcAdapter.getDefaultAdapter(this);
// Create a generic PendingIntent that will be deliver to this activity. The NFC stack
// will fill in the intent with the details of the discovered tag before delivering to
// this activity.
mPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
// Setup an intent filter for all MIME based dispatches
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
ndef.addDataType("*/*");
} catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
mFilters = new IntentFilter[] {
};
// Setup a tech list for all NfcF tags
mTechLists = new String[][] { new String[] { NfcF.class.getName() } };
}
public void onResume() {
super.onResume();
mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists);
}
@Override
public void onNewIntent(Intent intent) {
Log.i("Foreground dispatch", "Discovered tag with intent: " + intent);
CharSequence text = ("Discovered tag " + ++mCount + " with intent: " + intent);
int duration = Toast.LENGTH_SHORT;
Tag myTag = (Tag) intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Toast toast = Toast.makeText(MainActivity.this,myTag.getId().toString() , duration);
toast.show();
}
@Override
public void onPause() {
super.onPause();
//mAdapter.disableForegroundDispatch(this);
throw new RuntimeException("onPause not implemented to fix build");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
它不再崩溃,只是没有用ID进行祝酒。
答案 0 :(得分:0)
我强烈推荐this sample application中的这个this link。不要像过去那样通过尝试一切来轻松操作来给自己带来痛苦。
你可能在onResume和onNewIntent的操作布局中做错了。但是,在我链接的示例中,它在onResume和onNewIntent中都有对新标记和ndef的控制。如果你真的想继续自己的项目,试试这个。