Android實現NFC讀取校園卡
更新時間:2021年09月18日 10:07:11 作者:張倬勝
這篇文章主要為大家詳細介紹了Android實現NFC讀取校園卡,文中示例代碼介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們可以參考一下
本文實例為大家分享了Android實現NFC讀取校園卡的具體代碼,供大家參考,具體內容如下
主程序:
package com.nfclab.stuCard; import java.io.IOException; import android.app.Activity; import android.app.PendingIntent; import android.content.Intent; import android.content.IntentFilter; import android.nfc.NdefMessage; import android.nfc.NdefRecord; import android.nfc.NfcAdapter; import android.nfc.Tag; import android.nfc.tech.Ndef; import android.nfc.tech.NdefFormatable; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class stuCardActivity extends Activity { private NfcAdapter mNfcAdapter; private PendingIntent mPendingIntent; private IntentFilter[] mFilters; private String[][] mTechLists; private String studentId=""; private String studentName=" "; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final EditText studentIdEditText = (EditText)this.findViewById(R.id.studentIdEditText); final EditText studentNameEditText = (EditText)this.findViewById(R.id.studentNameEditText); Button writeStudentButton = (Button)this.findViewById(R.id.writeStudentButton); writeStudentButton.setOnClickListener(new android.view.View.OnClickListener() { public void onClick(View view) { studentId = studentIdEditText.getText().toString(); studentName = studentNameEditText.getText().toString(); TextView messageText = (TextView)findViewById(R.id.messageText); messageText.setText("Touch NFC Tag to write \n"); messageText.append("Student id:" + studentId + "\nStudent Name: " + studentName ); } }); Button exitButton = (Button)findViewById(R.id.exitButton); exitButton.setOnClickListener(new android.view.View.OnClickListener() { public void onClick(View v) { finish(); } }); mNfcAdapter = NfcAdapter.getDefaultAdapter(this); mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0); IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED); //ndef.addDataScheme("http"); mFilters = new IntentFilter[] { ndef, }; mTechLists = new String[][] { new String[] { Ndef.class.getName() }, new String[] { NdefFormatable.class.getName() }}; } @Override public void onResume() { super.onResume(); if (mNfcAdapter != null) mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists); } @Override public void onNewIntent(Intent intent) { Log.i("Foreground dispatch", "Discovered tag with intent: " + intent); Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); String externalType = "nfclab.com:transport"; String payload = studentId+":"+studentName; NdefRecord extRecord1 = new NdefRecord(NdefRecord.TNF_EXTERNAL_TYPE, externalType.getBytes(), new byte[0], payload.getBytes()); NdefMessage newMessage = new NdefMessage(new NdefRecord[] { extRecord1}); writeNdefMessageToTag(newMessage, tag); } @Override public void onPause() { super.onPause(); mNfcAdapter.disableForegroundDispatch(this); } boolean writeNdefMessageToTag(NdefMessage message, Tag detectedTag) { int size = message.toByteArray().length; try { Ndef ndef = Ndef.get(detectedTag); if (ndef != null) { ndef.connect(); if (!ndef.isWritable()) { Toast.makeText(this, "Tag is read-only.", Toast.LENGTH_SHORT).show(); return false; } if (ndef.getMaxSize() < size) { Toast.makeText(this, "The data cannot written to tag, Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size + " bytes.", Toast.LENGTH_SHORT).show(); return false; } ndef.writeNdefMessage(message); ndef.close(); Toast.makeText(this, "Message is written tag.", Toast.LENGTH_SHORT).show(); return true; } else { NdefFormatable ndefFormat = NdefFormatable.get(detectedTag); if (ndefFormat != null) { try { ndefFormat.connect(); ndefFormat.format(message); ndefFormat.close(); Toast.makeText(this, "The data is written to the tag ", Toast.LENGTH_SHORT).show(); return true; } catch (IOException e) { Toast.makeText(this, "Failed to format tag", Toast.LENGTH_SHORT).show(); return false; } } else { Toast.makeText(this, "NDEF is not supported", Toast.LENGTH_SHORT).show(); return false; } } } catch (Exception e) { Toast.makeText(this, "Write opreation is failed", Toast.LENGTH_SHORT).show(); } return false; } }
布局文件:
<?xml version="1.0" encoding="utf-8"?> <GridLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="fill_parent" android:columnCount="2" android:orientation="horizontal" android:rowCount="5" > <TextView android:id="@+id/requestStudentId" android:layout_row="0" android:layout_column="0" android:text="@string/requestStudentIdText" android:textSize="16sp" /> <EditText android:id="@+id/studentIdEditText" android:layout_row="0" android:layout_column="1" android:inputType="text" android:text="@string/emptyText" > <requestFocus /> </EditText> <TextView android:id="@+id/requestName" android:layout_row="1" android:layout_column="0" android:text="@string/requestStudentNameText" android:textSize="16sp" ></TextView> <EditText android:id="@+id/studentNameEditText" android:layout_row="1" android:layout_column="1" android:inputType="text" android:text="@string/emptyText" > </EditText> <TextView android:id="@+id/messageText" android:layout_row="3" android:layout_column="0" android:layout_columnSpan="2" android:gravity="left" android:text="@string/emptyText" android:textSize="24sp" /> <Button android:id="@+id/writeStudentButton" android:layout_row="2" android:layout_column="0" android:gravity="left" android:text="@string/writeButtonText" /> <Button android:id="@+id/exitButton" android:layout_row="2" android:layout_column="1" android:gravity="left" android:text="@string/exitButtonText" /> </GridLayout>
配置文件:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.nfclab.transportationwriter" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" /> <uses-permission android:name="android.permission.NFC" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".stuCardActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持腳本之家。
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