为什么我的手机只有自带的程序能够读取到nfc标签但是我自己写的应用却读不到呢？我确定应用应该是没错的
本帖最后由 DingXueBin001 于 2013-08-24 17:19:43 编辑 最近一直遇到这样的问题，为什么我的手机只有自带的程序能够读取到nfc标签但是我自己写的应用却读不到呢？我确定应用应该是没错的
谁能帮我解答解答呢？
这是我的代码：
package zwu.xxh.nfc_demo;
import android.app.Activity;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.os.Bundle;
import android.widget.TextView;
public class Beam extends Activity {
NfcAdapter nfcAdapter;
TextView promt;
byte a[]={(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff,(byte)0xff};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
promt = (TextView) findViewById(R.id.promt);
// 获取默认的NFC控制器
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (nfcAdapter == null) {
promt.setText("设备不支持NFC！");
finish();
return;
}
if (!nfcAdapter.isEnabled()) {
promt.setText("请在系统设置中先启用NFC功能！");
finish();
return;
}
}
@Override
protected void onResume() {
super.onResume();
//得到是否检测到ACTION_TECH_DISCOVERED触发
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
//处理该intent
processIntent(getIntent());
}
}
//字符序列转换为16进制字符串
private String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("0x");
if (src == null || src.length <= 0) {
return null;
}
char[] buffer = new char[2];
for (int i = 0; i < src.length; i++) {
buffer[0] = Character.forDigit((src[i] >>> 4) & 0x0F, 16);
buffer[1] = Character.forDigit(src[i] & 0x0F, 16);
//System.out.println(buffer);
stringBuilder.append(buffer);
}
return stringBuilder.toString();
}
/**
* Parses the NDEF Message from the intent and prints to the TextView
*/
private void processIntent(Intent intent) {
//取出封装在intent中的TAG
Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
for (String tech : tagFromIntent.getTechList()) {
// System.out.println(tech);
}
boolean auth = false;
//读取TAG
MifareClassic mfc = MifareClassic.get(tagFromIntent);
try {
String metaInfo = "";
//Enable I/O operations to the tag from this TagTechnology object.
mfc.connect();
int type = mfc.getType();//获取TAG的类型
int sectorCount = mfc.getSectorCount();//获取TAG中包含的扇区数
String typeS = "";
switch (type) {
case MifareClassic.TYPE_CLASSIC:
typeS = "TYPE_CLASSIC";
break;
case MifareClassic.TYPE_PLUS:
typeS = "TYPE_PLUS";
break;
case MifareClassic.TYPE_PRO:
typeS = "TYPE_PRO";
break;
case MifareClassic.TYPE_UNKNOWN:
typeS = "TYPE_UNKNOWN";
break;
}
metaInfo += "卡片类型：" + typeS + "\n共" + sectorCount + "个扇区\n共"
+ mfc.getBlockCount() + "个块\n存储空间: " + mfc.getSize() + "B\n";
for (int j = 0; j < sectorCount; j++) {
//Authenticate a sector with key A.
// auth = mfc.authenticateSectorWithKeyA(j, MifareClassic.KEY_DEFAULT);
auth = mfc.authenticateSectorWithKeyA(j, a);
// System.out.println("xxh+"+bytesToHexString(MifareClassic.KEY_DEFAULT));
int bCount;
int bIndex;
if (auth) {
metaInfo += "Sector " + j + ":验证成功\n";
// 读取扇区中的块
bCount = mfc.getBlockCountInSector(j);
bIndex = mfc.sectorToBlock(j);
for (int i = 0; i < bCount; i++) {
byte[] data = mfc.readBlock(bIndex);
metaInfo += "Block " + bIndex + " : "
+ bytesToHexString(data) + "\n";
bIndex++;
}
} else {
metaInfo += "Sector " + j + ":验证失败\n";
}
}
promt.setText(metaInfo);
} catch (Exception e) {
e.printStackTrace();
}
}
}
但是每次读取时，只是手机自带的读取到而应用却没有读取到！！把手机自带的给停用之后还是读不到！！ NFC Android 移动开发
[解决办法]
参考官方API android-sdk-windows/docs/guide/topics/connectivity/nfc/nfc.html
activity里面要配置过滤器
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED"/>
</intent-filter>
[解决办法]
手机自带的能得到 你的不行 那估计是权限问题了 搞成系统app试试
[解决办法]
