dami2

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public class MainActivity extends Activity {

    private Button mButton;
    private NfcAdapter mNFCAdapter = null;
    private PendingIntent mPendingIntent = null;
    private String mPackageName;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton = (Button)findViewById(R.id.mybutton);
        mButton.setOnClickListener(new OnClickListener() {
           
            @Override
            public void onClick(View v) {
               
            }
        });
        checkNFCFunction();
        initNFC();
    }
   
    //因为当前是singleTop模式，所以当重新靠近NFC标签设备的时候，不会走onCreate函数，会响应onNewIntent函数
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if(null != mNFCAdapter) {
            mNFCAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);
        }
    }

   
   
    @Override
    protected void onPause() {
        super.onPause();
        if(null != mNFCAdapter) {
            mNFCAdapter.disableForegroundDispatch(this);
        }
    }

    private void initNFC() {
        //mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
        mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()), 0);
        IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
        IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
        IntentFilter techDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
        mFilters = new IntentFilter[] {ndefDetected};
        mTechLists = new String[][]{
            new String[]{Ndef.class.getName()},
            new String[]{NdefFormatable.class.getName()}
        };
       
    }
    private void checkNFCFunction() {
        mNFCAdapter = NfcAdapter.getDefaultAdapter(this);
        if(mNFCAdapter == null) {
            Toast.makeText(this, "该设备不支持NFC功能", 3000).show();
        }
        else {
            if(!mNFCAdapter.isEnabled()) {
                AlertDialog dialog;
                AlertDialog.Builder customBuilder = new AlertDialog.Builder(this);
                customBuilder.setTitle("提示")
                .setMessage("该设备的nfc功能为打开，是否跳转到设置界面打开NFC功能")
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                   
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        finish();
                    }
                })
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                   
                    @Override
                    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);
                dialog.setCanceledOnTouchOutside(false);
                dialog.show();
            }
        }
    }
   
}

dami2

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原文地址：http://www.cnblogs.com/zhangkefan/p/5043323.html