NFC Android 开发问题
我在网上看了很多Android系统NFC开发的实例，但是，在我实际使用中始终无法是用畅通，所以在此求助！！我的实例是
AndroidManifest.xml：
[html] <span style="font-size:16px;"><?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.reno"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.NFC" />
<uses-sdk android:minSdkVersion="14" />
<uses-feature android:name="android.hardware.nfc" android:required="true" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name="org.reno.Beam"
android:label="@string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
</activity>
</application>
</manifest>
</span>
<span style="font-size:16px;"><?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.reno"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.NFC" />
<uses-sdk android:minSdkVersion="14" />
<uses-feature android:name="android.hardware.nfc" android:required="true" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name="org.reno.Beam"
android:label="@string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
</activity>
</application>
</manifest>
</span>
res/xml/nfc_tech_filter.xml：
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
<tech-list>
<tech>android.nfc.tech.MifareClassic</tech>
</tech-list>
</resources>
res/layout/main.xml
[html] <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ScrollView
android:id="@+id/scrollView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:drawable/edit_text" >
<TextView
android:id="@+id/promt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
android:singleLine="false"
android:text="@string/info" />
</ScrollView>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ScrollView
android:id="@+id/scrollView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:drawable/edit_text" >
<TextView
android:id="@+id/promt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
android:singleLine="false"
android:text="@string/info" />
</ScrollView>
</LinearLayout>
<resources>
<string name="app_name">NFC测试</string>
<string name="info">扫描中。。。</string>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">NFC测试</string>
<string name="info">扫描中。。。</string>
</resources>
src/org/reno/Beam.java
[java] package org.reno;
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;
@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);
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();
}
}
}
但是在我实际使用中发现在onResume（）中 if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) 后无法跳入processIntent函数中，我不明白为什么NfcAdapter.ACTION_TECH_DISCOVERED不等于getIntent().getAction()，所以各种求助！！ --------------------编程问答-------------------- 怎么没发现你的onNewIntent在哪去了呢？
你可以参考这样：
@Override--------------------编程问答-------------------- 不知道楼主知道什么原因没有？能否指教一下 --------------------编程问答-------------------- NfcAdapter.ACTION_TECH_DISCOVERED=android.nfc.action.TECH_DISCOVERED，而getIntent().getAction()=android.intent.action.MAIN，只有当你进入onNewIntent才会相等
public void onResume() {
super.onResume();
// Check to see that the Activity started due to an Android Beam
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
processIntent(getIntent());
}
}
@Override
public void onNewIntent(Intent intent) {
// onResume gets called after this to handle the intent
setIntent(intent);
}
补充：移动开发 , Android
