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NFC,什么是NFC?想必大家都聽過,就是近場通信,接下來我想給大家展示一個簡單的demo, 這個demo是我在公司工作中開發的功能.希望這篇文章對大家有所幫助

目前在市場在見得比較多的電子標簽有 1443 和15693 兩種類型的卡片(當然還有其它類型的),這兩種卡片是什么東東呢?自己百度一下,網上一大把資料有介紹的.

在我實際開發過程中就是主要接觸這兩種類型的卡片.我需要實現的功能是,利用帶有NFC功能的手機,去讀取電子標簽中的數據(卡片id值這里叫UID),網上可以下載很多可以讀取電子標簽的app軟件,但是,在我的demo里面, 是要屏蔽第三方的NFC掃描軟件, 我只想用自己開發的軟件去讀取這些電子標簽(即不使用前臺調度,彈出個對話框,讓我們選擇使用哪個NFC軟件去讀取)

不多說, 直接上源碼比較實在

package?com.iotdc.android.app.nfc.activity;import?java.io.Serializable;import?android.annotation.SuppressLint; import?android.app.Activity; import?android.app.PendingIntent; import?android.content.Context; import?android.content.Intent; import?android.content.IntentFilter; import?android.content.IntentFilter.MalformedMimeTypeException; import?android.graphics.Paint; import?android.nfc.NfcAdapter; import?android.nfc.NfcManager; import?android.nfc.tech.IsoDep; import?android.nfc.tech.MifareClassic; import?android.nfc.tech.MifareUltralight; import?android.nfc.tech.Ndef; import?android.nfc.tech.NdefFormatable; import?android.nfc.tech.NfcA; import?android.nfc.tech.NfcB; import?android.nfc.tech.NfcF; import?android.nfc.tech.NfcV; import?android.os.Bundle; import?android.view.KeyEvent; import?android.view.View; import?android.view.View.OnClickListener; import?android.widget.ImageView; import?android.widget.TextView;import?com.iotdc.android.app.scanner.R; import?com.iotdc.android.app.scanresult.activity.TwoDimensionCodeActivity; import?com.iotdc.android.app.utils.NFCUtil; import?com.iotdc.android.app.utils.NFCUtil.NFCData;@SuppressLint("NewApi") public?class?NFCActivity?extends?Activity?{//?private?Intent?intent;private?TextView?tvNfc;private?TextView?tvOpenNfC;private?NfcManager?manager;private?NfcAdapter?adapter;private?PendingIntent?mNfcPendingIntent;private?IntentFilter[]?mWriteTagFilters;private?String[][]?techListsArray;@Overrideprotected?void?onCreate(Bundle?savedInstanceState)?{super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc);initTitile();init();initNFC();}private?void?init()?{tvNfc?=?(TextView)?findViewById(R.id.tv_nfc);tvOpenNfC?=?(TextView)?findViewById(R.id.tv_open_nfc);tvOpenNfC.getPaint().setFlags(Paint.UNDERLINE_TEXT_FLAG);tvOpenNfC.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?v)?{Intent?intent?=?new?Intent(NFCActivity.this,NFCGuidActivity.class);startActivity(intent);overridePendingTransition(R.anim.c_left_1_righttoleft,R.anim.c_left_2_lefttoright);}});}@SuppressLint("NewApi")public?void?initNFC()?{manager?=?(NfcManager)?this.getSystemService(Context.NFC_SERVICE);adapter?=?manager.getDefaultAdapter();if?(adapter?!=?null)?{if?(adapter.isEnabled())?{tvNfc.setVisibility(View.GONE);}?else?{tvNfc.setVisibility(View.VISIBLE);}}?else?{tvNfc.setVisibility(View.VISIBLE);}}@Overrideprotected?void?onResume()?{super.onResume();System.out.println("onResume");if?(adapter?!=?null)?{mNfcPendingIntent?=?PendingIntent.getActivity(this,?0,new?Intent(this,?getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),?0);IntentFilter?ndefDetected?=?new?IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);IntentFilter?ndefDetected2?=?new?IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);IntentFilter?ndefDetected3?=?new?IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);try?{ndefDetected.addDataType("*/*");?//}?catch?(MalformedMimeTypeException?e)?{throw?new?RuntimeException("fail",?e);}techListsArray?=?new?String[][]?{?new?String[]?{NfcA.class.getName(),?NfcV.class.getName(),Ndef.class.getName(),?NdefFormatable.class.getName(),MifareClassic.class.getName(),MifareUltralight.class.getName(),?IsoDep.class.getName(),NfcB.class.getName(),?NfcF.class.getName()?}?};mWriteTagFilters?=?new?IntentFilter[]?{?ndefDetected,ndefDetected2,?ndefDetected3?};adapter.enableForegroundDispatch(this,?mNfcPendingIntent,mWriteTagFilters,?techListsArray);Intent?intent?=?this.getIntent();resolveIntent(intent);?//?這兩行代碼一定要寫}}@Overrideprotected?void?onNewIntent(Intent?intent)?{super.onNewIntent(intent);System.out.println("onNewIntent");resolveIntent(intent);}private?void?resolveIntent(Intent?intent)?{if?(adapter?!=?null)?{NFCData?nd?=?NFCUtil.getNFCIntentData(intent);if?(nd?!=?null)?{String?uid?=?nd.getUid();if?(uid?!=?null?&&?!"".equals(uid))?{intent?=?new?Intent(NFCActivity.this,ResultActivity.class);intent.putExtra("nfcData",?(Serializable)?nd);startActivity(intent);overridePendingTransition(R.anim.c_left_1_righttoleft,R.anim.c_left_2_lefttoright);}}}}@Overrideprotected?void?onPause()?{super.onPause();if?(adapter?!=?null)?{adapter.disableForegroundDispatch(this);}}public?void?initTitile()?{TextView?tv_title?=?(TextView)?findViewById(R.id.tv_title);tv_title.setText(R.string.scan_nfc_title);ImageView?iv_left?=?(ImageView)?findViewById(R.id.iv_left);iv_left.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?v)?{finish();overridePendingTransition(R.anim.c_right_1_lefttoright,R.anim.c_right_2_righttoleft);}});ImageView?iv_right?=?(ImageView)?findViewById(R.id.iv_right);iv_right.setVisibility(View.INVISIBLE);}@Overridepublic?boolean?onKeyDown(int?keyCode,?KeyEvent?event)?{if?(keyCode?==?KeyEvent.KEYCODE_BACK)?{this.finish();overridePendingTransition(R.anim.c_right_1_lefttoright,R.anim.c_right_2_righttoleft);}return?super.onKeyDown(keyCode,?event);} }

下面是activity_nfc的布局文件

<?xml?version="1.0"?encoding="utf-8"?> <LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"?><include?layout="@layout/title"?/><LinearLayoutandroid:id="@+id/no_info_frag"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"?><ImageViewandroid:id="@+id/noRecord"android:layout_width="100dp"android:layout_height="100dp"android:layout_gravity="center"android:layout_marginTop="127dp"android:src="@drawable/nfc_bitmap"?/><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="10dp"android:layout_marginLeft="20dp"android:layout_marginRight="20dp"android:text="@string/NFCText"android:textColor="@color/golden"android:layout_gravity="center"android:gravity="center"android:textSize="15sp"?/><TextViewandroid:id="@+id/tv_nfc"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="10dp"android:layout_marginLeft="50dp"android:layout_marginRight="50dp"android:text="@string/noNFCText"android:textColor="@color/red"android:layout_gravity="center"android:gravity="center"android:textSize="15sp"?/><TextViewandroid:id="@+id/tv_open_nfc"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="30dp"android:text="@string/openNFCText"android:textColor="#004190"android:layout_gravity="center"android:textSize="18sp"?/></LinearLayout></LinearLayout>

使用一個ResultActivity來顯示NFC讀取到電子標簽的結果,用一個TextView 顯示就是了, 大家都懂的

package?com.iotdc.android.app.nfc.activity;import?android.app.Activity; import?android.content.Intent; import?android.os.Bundle; import?android.view.View; import?android.view.View.OnClickListener; import?android.widget.ImageView; import?android.widget.TextView;import?com.iotdc.android.app.config.SystemConfig; import?com.iotdc.android.app.scanner.R;public?class?NFCResultActivity?extends?Activity{@Overrideprotected?void?onCreate(Bundle?savedInstanceState)?{super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc_result);initTitleBar();TextView?tvRead?=?(TextView)?findViewById(R.id.tv_nfc_read);Intent?data?=?this.getIntent();String?uid?=?data.getStringExtra("nfcResult");String?msg?=?data.getStringExtra("msg");SystemConfig.error(msg,?this);tvRead.setText(uid);}private?void?initTitleBar(){TextView?tv_title?=?(TextView)?findViewById(R.id.tv_title);tv_title.setText(R.string.scan_nfc_title_result);ImageView?iv_left?=?(ImageView)?findViewById(R.id.iv_left);iv_left.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?v)?{finish();overridePendingTransition(R.anim.c_right_1_lefttoright,R.anim.c_right_2_righttoleft);}});ImageView?iv_right?=?(ImageView)?findViewById(R.id.iv_right);iv_right.setVisibility(View.INVISIBLE);} }

其中NFC讀取數據的方法我寫在了一個工具類中,叫NFCUtil

package?com.iotdc.android.app.utils;import?java.io.Serializable;import?android.annotation.SuppressLint; import?android.content.Intent; import?android.nfc.NfcAdapter; import?android.nfc.Tag;import?com.iotdc.android.app.nfc.TagBlockStream;public?class?NFCUtil?{@SuppressLint("NewApi")public?static?NFCData?getNFCIntentData(Intent?intent)?{NFCData?nd?=?new?NFCData();String?uid?=?"";String?data?=?"";String?action?=?intent.getAction();?//?判斷nfc的類型,一共有三種if?(NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)||?NfcAdapter.ACTION_TAG_DISCOVERED.equals(action))?{Tag?tagFromIntent?=?intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);TagBlockStream?bs?=?TagBlockStream.getInstance(tagFromIntent);byte[]?blockContent?=?null;//?HonestTag?hTag?=?null;uid?=?HexUtility.byteArrayToString(tagFromIntent.getId());if?(bs?!=?null)?{try?{bs.connect();blockContent?=?bs.readBlock(0);}?catch?(Exception?e)?{e.printStackTrace();}?finally?{try?{bs.close();}?catch?(Exception?e)?{e.printStackTrace();}}}}nd.setUid(uid);?//?03190B0000014BE0return?nd;}public?static?class?NFCData?implements?Serializable?{/***?標簽UID?值*/private?String?uid;public?String?getUid()?{return?uid;}public?void?setUid(String?uid)?{this.uid?=?uid;}} }

到上面的話,邏輯代碼就已經完成了, 注意, 沒有完, NFC 一定要手機支持,并且要在Manifest.xml文件中進行權限配置

<uses-permission?android:name="android.permission.NFC"?/>

還要在對activity 進行過濾

<activityandroid:name="com.iotdc.android.app.nfc.activity.NFCActivity"android:screenOrientation="portrait"?><!--?這?一句一定是要的--><intent-filter><action?android:name="android.nfc.action.NDEF_DISCOVERED"?/></intent-filter> </activity>

到這里, 所有的工作就都完成了, 對NFC 我也不是太了解,只是在工作中用到了, 目前在公司的話, 還沒有接觸過手機與手機之間的通信, 希望大神能夠指導,共同進步

轉載于:https://my.oschina.net/u/1018305/blog/385173

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