今天就跟大家聊聊有关android中NFC读写功能的实现方法是怎样的，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
首先检查一下设备是否支持NFC功能
private void checkNFCFunction() {
// TODO Auto-generated method stub
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
// check the NFC adapter first
if (mNfcAdapter == null) {
// mTextView.setText("NFC apdater is not available");
Dialog dialog = null;
AlertDialog.Builder customBuilder = new AlertDialog.Builder(
this);
customBuilder
.setTitle("很遗憾")
.setMessage("没发现NFC设备，请确认您的设备支持NFC功能!")
.setIcon(R.drawable.ic_banner)
.setPositiveButton("是",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
finish();
}
});
dialog = customBuilder.create();
dialog.setCancelable(false);// back
dialog.setCanceledOnTouchOutside(false);
SetDialogWidth(dialog).show();
return;
} else {
if (!mNfcAdapter.isEnabled()) {
Dialog dialog = null;
AlertDialog.Builder customBuilder = new AlertDialog.Builder(
this);
customBuilder
.setTitle("提示")
.setMessage("请确认NFC功能是否开启!")
.setIcon(R.drawable.ic_banner)
.setPositiveButton("现在去开启......",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
Intent setnfc = new Intent(
Settings.ACTION_NFC_SETTINGS);
startActivity(setnfc);
}
});
dialog = customBuilder.create();
dialog.setCancelable(false);// back
dialog.setCanceledOnTouchOutside(false);
SetDialogWidth(dialog).show();
return;
}
}
}读取NFC信息
package com.xxzhy.shujucaiji.fengxiang;
import android.app.Dialog;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.Ndef;
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.provider.Settings;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.xxzhy.shujucaiji.R;
import com.xxzhy.shujucaiji.utils.ByteArrayChange;
import com.xxzhy.shujucaiji.utils.ToStringHex;
import com.xxzhy.shujucaiji.utils.ToastUtil;
import com.xxzhy.shujucaiji.utils.WebServiceClient;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import butterknife.BindView;
import butterknife.ButterKnife;
/**
* Created by apple on 2017/10/30.
*/
public class FengxiangThreeActivity extends AppCompatActivity {
@BindView(R.id.tv_bianma)
TextView tvBianma;
@BindView(R.id.ll_input)
LinearLayout llInput;
@BindView(R.id.noteText)
TextView noteText;
@BindView(R.id.writeBtn)
Button writeBtn;
String[][] mTechLists;
private Boolean ifWrite;
private NfcAdapter mNfcAdapter;
private PendingIntent mPendingIntent;
private IntentFilter[] mFilters;
byte[] code = MifareClassic.KEY_DEFAULT;//读写标签中每个块的密码
private byte[] b0;
int block[] = {4, 5, 6, 8, 9, 10, 12, 13, 14, 16, 17, 18, 20, 21, 22, 24,
25, 26, 28, 29, 30, 32, 33, 34, 36, 37, 38, 40, 41, 42, 44, 45, 46,
48, 49, 50, 52, 53, 54, 56, 57, 58, 60, 61, 62};
private String samCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fengxiang_three);
ButterKnife.bind(this);
writeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifWrite = true;
}
});
samCode = getIntent().getStringExtra("samCode");
tvBianma.setText(samCode);
checkNFCFunction(); // NFC Check
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_TECH_DISCOVERED);
try {
ndef.addDataType("*/*");
} catch (IntentFilter.MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
mFilters = new IntentFilter[]{ndef,};
// 根据标签类型设置
mTechLists = new String[][]{new String[]{NfcA.class.getName()}};
}
private void checkNFCFunction() {
// TODO Auto-generated method stub
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
// check the NFC adapter first
if (mNfcAdapter == null) {
// mTextView.setText("NFC apdater is not available");
Dialog dialog = null;
AlertDialog.Builder customBuilder = new AlertDialog.Builder(
this);
customBuilder
.setTitle("很遗憾")
.setMessage("没发现NFC设备，请确认您的设备支持NFC功能!")
.setIcon(R.drawable.ic_banner)
.setPositiveButton("是",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
finish();
}
});
dialog = customBuilder.create();
dialog.setCancelable(false);// back
dialog.setCanceledOnTouchOutside(false);
SetDialogWidth(dialog).show();
return;
} else {
if (!mNfcAdapter.isEnabled()) {
Dialog dialog = null;
AlertDialog.Builder customBuilder = new AlertDialog.Builder(
this);
customBuilder
.setTitle("提示")
.setMessage("请确认NFC功能是否开启!")
.setIcon(R.drawable.ic_banner)
.setPositiveButton("现在去开启......",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
Intent setnfc = new Intent(
Settings.ACTION_NFC_SETTINGS);
startActivity(setnfc);
}
});
dialog = customBuilder.create();
dialog.setCancelable(false);// back
dialog.setCanceledOnTouchOutside(false);
SetDialogWidth(dialog).show();
return;
}
}
}
private Dialog SetDialogWidth(Dialog dialog) {
// TODO 自动生成的方法存根
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenWidth = dm.widthPixels;
int screenHeight = dm.heightPixels;
WindowManager.LayoutParams params = dialog.getWindow().getAttributes();
if (screenWidth > screenHeight) {
params.width = (int) (((float) screenHeight) * 0.875);
} else {
params.width = (int) (((float) screenWidth) * 0.875);
}
dialog.getWindow().setAttributes(params);
return dialog;
}
@Override
protected void onNewIntent(Intent intent) {
// TODO 自动生成的方法存根
super.onNewIntent(intent);
// tv1.setText("发现新的 Tag: " + ++mCount + "\n");// mCount 计数
String intentActionStr = intent.getAction();// 获取到本次启动的action
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intentActionStr)// NDEF类型
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(intentActionStr)// 其他类型
|| NfcAdapter.ACTION_TAG_DISCOVERED.equals(intentActionStr)) {// 未知类型
// 在intent中读取Tag id
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] bytesId = tag.getId();// 获取id数组
// info += ByteArrayChange.ByteArrayToHexString(bytesId) + "\n";
// tv2.setText("标签UID: " + "\n" + info);
// 读取存储信息
// if (mRead.isChecked()) {
// // mChange=false;
// tv3.setText("读取成功! " + readTag(tag));
// // readNfcVTag(tag);
// etSector.setText("");
// etBlock.setText("");
// etData.setText("");
// }
// 写数据
if (ifWrite) {
if (samCode.length() < 16){
for (int i = samCode.length(); i < 16; i++) {
samCode+=" ";
}
}
writeTag(tag, samCode);
}
// 转换为ASCll
// if (mChange.isChecked()) {
// tv3.setText(change(tag));
// Toast.makeText(getBaseContext(), "转换成功", Toast.LENGTH_SHORT).show();
// etSector.setText("");
// etBlock.setText("");
// etData.setText("");
// }
}
}
// 写数据
public void writeTag(Tag tag, String str) {
MifareClassic mfc = MifareClassic.get(tag);
try {
if (mfc != null) {
mfc.connect();
} else {
Toast.makeText(this, "写入失败", Toast.LENGTH_SHORT).show();
return;
}
boolean b = mfc.authenticateSectorWithKeyA(5, code);
if (b) {
mfc.writeBlock(4 * 5, str.getBytes());
mfc.close();
ToastUtil.showToast("写入成功");
finish();
}
} catch (IOException e) {
e.printStackTrace();
ToastUtil.showToast("写入失败");
}
}
@Override
protected void onResume() {
super.onResume();
enableForegroundDispatch();
}
private void enableForegroundDispatch() {
if (mNfcAdapter != null) {
mNfcAdapter.enableForegroundDispatch(this, mPendingIntent,
mFilters, mTechLists);
}
}
@Override
public void onPause() {
super.onPause();
disableForegroundDispatch();
}
private void disableForegroundDispatch() {
// TODO 自动生成的方法存根
if (mNfcAdapter != null) {
mNfcAdapter.disableForegroundDispatch(this);
}
}
}看完上述内容，你们对android中NFC读写功能的实现方法是怎样的有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注亿速云行业资讯频道，感谢大家的支持。
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