我的应用程序基本上只是采用任何标签的标签ID
我希望应用程序在不询问用户使用什么应用程序的情况下运行
直接来自同一个应用
我在互联网上找到了关于如何开发NFC编写器和阅读器的教程
但每次点击系统都会要求用户选择一个应用程序（即使我关闭了应用程序）
因为我要为不同的实现创建不同的活动，所以通过使用相同的方法，Android系统会要求用户选择许多应用程序（它们都是我的应用程序活动）
这是我的代码： -
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.nfc.test"
android:versionCode="1"
android:versionName="1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.NFC" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TapToRegisterTag" android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
</activity>
<!-- Other Activities -->
</application>
</manifest>
TapToRegisterTag.java
package com.nfc.test;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class TapToRegisterTag extends Activity{
// Prepare NFC Tag variables
Tag myTag;
String tagID;
NfcAdapter mNfcAdapter;
public static final String MIME_TEXT_PLAIN = "text/plain";
public static final String TAG = "NfcDemo";
ImageView logo;
TextView txt;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.register_tag_layout);
logo = (ImageView)findViewById(R.id.imageView2);
txt = (TextView)findViewById(R.id.textView);
// prepare NFC
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (mNfcAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mNfcAdapter.isEnabled()) {
Toast.makeText(this, "NFC is disabled.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "NFC is Enabled.", Toast.LENGTH_LONG).show();
}
handleIntent(getIntent());
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
/**
* It's important, that the activity is in the foreground (resumed). Otherwise
* an IllegalStateException is thrown.
*/
setupForegroundDispatch(this, mNfcAdapter);
try{
this.myTag = (Tag) getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
this.tagID = OnetapActivity.bytesToHex(myTag.getId());
Toast.makeText(this, "Tag ID: \n" + tagID, Toast.LENGTH_LONG).show();
}catch (Exception ex){
Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();
}
}
@Override
protected void onPause() {
stopForegroundDispatch(this, mNfcAdapter);
super.onPause();
}
@Override
protected void onNewIntent(Intent intent) {
handleIntent(intent);
}
private void handleIntent(Intent intent) {
// TODO: handle Intent
String action = intent.getAction();
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
String type = intent.getType();
if (MIME_TEXT_PLAIN.equals(type)) {
//new NdefReaderTask().execute(tag);
try{
this.myTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
this.tagID = OnetapActivity.bytesToHex(this.myTag.getId());
Toast.makeText(this, "Tag ID: \n" + tagID, Toast.LENGTH_LONG).show();
}catch (Exception ex){
Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();
}
} else {
Log.d(TAG, "Wrong mime type: " + type);
}
} else if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
// In case we would still use the Tech Discovered Intent
this.myTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
String[] techList = this.myTag.getTechList();
String searchedTech = Ndef.class.getName();
for (String tech : techList) {
if (searchedTech.equals(tech)) {
//new NdefReaderTask().execute(tag);
try{
myTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
//this.myTag = (Tag) getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
this.tagID = OnetapActivity.bytesToHex(myTag.getId());
Toast.makeText(this, "Tag ID: \n" + tagID, Toast.LENGTH_LONG).show();
}catch (Exception ex){
Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();
}
break;
}
}
}
}
public static void setupForegroundDispatch(final Activity activity, NfcAdapter adapter) {
final Intent intent = new Intent(activity.getApplicationContext(), activity.getClass());
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
final PendingIntent pendingIntent = PendingIntent.getActivity(activity.getApplicationContext(), 0, intent, 0);
IntentFilter[] filters = new IntentFilter[1];
String[][] techList = new String[][]{};
// Notice that this is the same filter as in our manifest.
filters[0] = new IntentFilter();
filters[0].addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
filters[0].addCategory(Intent.CATEGORY_DEFAULT);
try {
filters[0].addDataType(MIME_TEXT_PLAIN);
} catch (MalformedMimeTypeException e) {
throw new RuntimeException("Check your mime type.");
}
adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
}
public static void stopForegroundDispatch(final Activity activity, NfcAdapter adapter) {
adapter.disableForegroundDispatch(activity);
}
}
@ XML / nfc_tech_filter.xml
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
<tech-list>
<tech>android.nfc.tech.Ndef</tech>
<!-- class name -->
</tech-list>
</resources>
<!--
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
<tech-list>
<tech>android.nfc.tech.IsoDep</tech>
<tech>android.nfc.tech.NfcA</tech>
<tech>android.nfc.tech.NfcB</tech>
<tech>android.nfc.tech.NfcF</tech>
<tech>android.nfc.tech.NfcV</tech>
<tech>android.nfc.tech.Ndef</tech>
<tech>android.nfc.tech.NdefFormatable</tech>
<tech>android.nfc.tech.MifareClassic</tech>
<tech>android.nfc.tech.MifareUltralight</tech>
</tech-list>
</resources>
-->
答案 0 :(得分：0)
到目前为止，我唯一知道的是AAR（Android应用程序记录）的实现。这些是标签中的NDEF消息，它只启动AAR中给出的应用程序。这非常有效。但是，您必须实现NDEF缩进。你可以试试Android市场上的一些AAR作家。
答案 1 :(得分：0)
其实我找到了一个解决方案，感谢我的朋友
这是他的回答：
也许您应该将'过滤器'和'techlist'更改为null
您的代码：
adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
更改为
adapter.enableForegroundDispatch(activity, pendingIntent, null, null);
参考：
如果为此方法提供了任何IntentFilters，它们将用于匹配ACTION_NDEF_DISCOVERED和ACTION_TAG_DISCOVERED的调度Intent。由于ACTION_TECH_DISCOVERED依赖于该调度的IntentFilter匹配之外的元数据，因此通过单独传入技术列表来处理Intent。技术列表中的每个第一级条目代表必须全部匹配的一系列技术。如果任何第一级别集匹配，则通过给定的PendingIntent路由调度。换句话说，第二级是AND在一起，第一级条目是OR在一起。
如果为属于通配符的过滤器和techLists参数传递null，并且将导致前台活动通过ACTION_TAG_DISCOVERED意图接收所有标记。
来源：
答案 2 :(得分：0)
我反编译一个google play apk并制作此代码：
public static void resume(Context con, Activity _activity) {
NfcAdapter _nfcAdapter = NfcAdapter.getDefaultAdapter(con);
if (!_isReceiveIntentEnabled) {
if (_nfcAdapter != null) {
_nfcAdapter.setNdefPushMessage(null, _activity, new Activity[0]);
NfcAdapter localNfcAdapter = _nfcAdapter;
Activity localActivity = _activity;
int flag = PendingIntent.FLAG_NO_CREATE; // 536870912;
Intent intent = new Intent(_activity, _activity.getClass()).addFlags(flag);
PendingIntent localPendingIntent = PendingIntent.getActivity(_activity, 0, intent, 0);
IntentFilter[] arrayOfIntentFilter = new IntentFilter[] { new IntentFilter("android.nfc.action.TECH_DISCOVERED") };
String[][] techArr = new String[][] { new String[] { IsoDep.class.getName() } };
localNfcAdapter.enableForegroundDispatch(localActivity, localPendingIntent, arrayOfIntentFilter, techArr);
}
_isReceiveIntentEnabled = true;
}
}
public static void pause(Context con, Activity _activity) {
NfcAdapter _nfcAdapter = NfcAdapter.getDefaultAdapter(con);
if (_isReceiveIntentEnabled) {
if (_nfcAdapter != null) {
_nfcAdapter.disableForegroundDispatch(_activity);
}
_isReceiveIntentEnabled = false;
}
}
不要忘记添加权限：
<uses-permission android:name="android.permission.NFC" />