如何使android应用程序收听特定的NFC芯片?
我正在创建一个应用程序,如果碰到了NFC芯片,它将执行某些操作,我知道以下有关Android中NFC的信息如果我输入错了,请纠正我
I'm creating application that do some action if hit NFC chip , I know the following information about NFC in Android please correct me if I am wrong
- 您不能将NFC的操作注册到清单文件中的接收方,只能注册活动.
- 每个NFC芯片都有其自己的唯一ID.
我想做的是
当应用程序处于后台或关闭状态时,如果我打了ID为(例如1234)的NFC芯片,我的应用程序便会吃午餐并执行一些操作.
what I want to do is
while the Application is in the background or it's closed , if I hit NFC chip with id (ex 1234) my app lunched and do some action.
有可能吗? 如果可以,如何实现?
is that possible ? if yes, how it can be achieved?
编辑
这是我的代码,当您检查任何NFC芯片并执行此操作时,它确实会打开android.nfc.action.TECH_DISCOVERED
但当它打开时,动作为android.intent.action.MAIN
MainActivity.java
edit
here is my code , it does open when you check any NFC chip and get this action android.nfc.action.TECH_DISCOVERED
but when it open the action is android.intent.action.MAIN
MainActivity.java
public class MainActivity extends AppCompatActivity {
public static final String ACTION_CHECK_IN= "checked";
public static final String ACTION_CHECK_OUT= "unchecked";
private NfcAdapter mNfcAdapter;
boolean isCheckedIn = false;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
isCheckedIn = Pref.getBoolean("check", false);
}
@Override
protected void onResume() {
super.onResume();
Log.d(TAG, "onResume() called with: " + "");
String action = getIntent().getAction();
if (action != null) {
Log.d("MainActivity", "onCreate(" + action + ")");
if (action.equals(NfcAdapter.ACTION_NDEF_DISCOVERED) || action.equals(NfcAdapter.ACTION_TAG_DISCOVERED) || action.equals(NfcAdapter.ACTION_TECH_DISCOVERED)) {
if (!isCheckedIn) {
isCheckedIn = true;
Pref.putBoolean("check", true);
Log.d("checking","IN");
} else {
isCheckedIn = false;
Pref.putBoolean("check", false);
Log.d("checking","Out");
}
}
}
if (!mNfcAdapter.isEnabled()) {
Toast.makeText(MainActivity.this, "Please open it ", Toast.LENGTH_SHORT).show();
}
/**
* It's important, that the activity is in the foreground.
* Otherwise an IllegalStateException is thrown.
*/
setupForegroundDispatch(this, mNfcAdapter);
}
@Override
protected void onPause() {
/**
* Call this before onPause, otherwise an IllegalArgumentException is thrown.
*/
stopForegroundDispatch(this, mNfcAdapter);
super.onPause();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
public static void setupForegroundDispatch(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[2];
String[][] techList = new String[][]{};
// same filter as manifest - action, category
filters[0] = new IntentFilter();
filters[0].addAction(NfcAdapter.ACTION_TAG_DISCOVERED);
filters[1] = new IntentFilter();
filters[1].addAction(NfcAdapter.ACTION_TECH_DISCOVERED);
adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
}
public static void stopForegroundDispatch(Activity activity, NfcAdapter adapter) {
adapter.disableForegroundDispatch(activity);
}
}
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.srjo.pocnfcadapter">
<uses-permission android:name="android.permission.NFC" />
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<application
android:name=".MyApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/filter_nfc" />
</activity>
</application>
</manifest>
首先在清单中注册您的应用
First register your app in the manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.survivingwithandroid.nfc" >
....
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain"/>
</intent-filter>
<manifest>
然后,您应该使用前台调度(前台应用程序).最后,您使用NFCAdapter读取内容(onNewIntent). 我撰写了详细的关于NFC的帖子喜欢看看.
Then you should use foreground dispatch (foreground app). Finally you use NFCAdapter to read the content (onNewIntent). I wrote a detailed posts about NFC if you like give a look.