First pass at advanced NFC tag dispatching APIs and other cleanup.

Change-Id: I022fcd481274a2f68d93218026e77551cfae8cae

Author: jham

core/java/android/nfc/INfcTag.aidl

@@ -34,9 +34,9 @@ interface INfcTag
 
     int getLastError(int nativeHandle);
 
-    NdefMessage read(int nativeHandle);
-    int write(int nativeHandle, in NdefMessage msg);
-    int makeReadOnly(int nativeHandle);
-    int getModeHint(int nativeHandle);
+    NdefMessage ndefRead(int nativeHandle);
+    int ndefWrite(int nativeHandle, in NdefMessage msg);
+    int ndefMakeReadOnly(int nativeHandle);
+    boolean ndefIsWritable(int nativeHandle);
     int formatNdef(int nativeHandle, in byte[] key);
 }

core/java/android/nfc/NfcAdapter.java

@@ -36,6 +36,32 @@
 public final class NfcAdapter {
     private static final String TAG = "NFC";
 
+    /**
+     * Intent to start an activity when a tag with NDEF payload is discovered.
+     * If the tag has and NDEF payload this intent is started before
+     * {@link #ACTION_TECHNOLOGY_DISCOVERED}.
+     *
+     * If any activities respond to this intent neither
+     * {@link #ACTION_TECHNOLOGY_DISCOVERED} or {@link #ACTION_TAG_DISCOVERED} will be started.
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String ACTION_NDEF_DISCOVERED = "android.nfc.action.NDEF_DISCOVERED";
+
+    /**
+     * Intent to started when a tag is discovered. The data URI is formated as
+     * {@code vnd.android.nfc://tag/} with the path having a directory entry for each technology
+     * in the {@link Tag#getTechnologyList()} is ascending order.
+     *
+     * This intent is started after {@link #ACTION_NDEF_DISCOVERED} and before
+     * {@link #ACTION_TAG_DISCOVERED}
+     *
+     * If any activities respond to this intent {@link #ACTION_TAG_DISCOVERED} will not be started.
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String ACTION_TECHNOLOGY_DISCOVERED = "android.nfc.action.TECH_DISCOVERED";
+
     /**
      * Intent to start an activity when a tag is discovered.
      */

core/java/android/nfc/technology/Ndef.java

@@ -79,7 +79,7 @@ public Ndef(NfcAdapter adapter, Tag tag, int tech, Bundle extras) throws RemoteE
     public NdefMessage getNdefMessage() throws IOException, FormatException {
         try {
             int serviceHandle = mTag.getServiceHandle();
-            NdefMessage msg = mTagService.read(serviceHandle);
+            NdefMessage msg = mTagService.ndefRead(serviceHandle);
             if (msg == null) {
                 int errorCode = mTagService.getLastError(serviceHandle);
                 switch (errorCode) {
@@ -119,7 +119,6 @@ public int getMaxSize() {
      * Provides a hint on whether writes are likely to succeed.
      * <p>Requires {@link android.Manifest.permission#NFC} permission.
      * @return true if write is likely to succeed
-     * @throws IOException if the target is lost or connection closed
      */
     public boolean isWritable() {
         return (mCardState == NDEF_MODE_READ_WRITE);
@@ -132,7 +131,7 @@ public boolean isWritable() {
      */
     public void writeNdefMessage(NdefMessage msg) throws IOException, FormatException {
         try {
-            int errorCode = mTagService.write(mTag.getServiceHandle(), msg);
+            int errorCode = mTagService.ndefWrite(mTag.getServiceHandle(), msg);
             switch (errorCode) {
                 case ErrorCodes.SUCCESS:
                     break;
@@ -169,7 +168,7 @@ public void writeExtraNdefMessage(int i, NdefMessage msg) throws IOException, Fo
      */
     public boolean makeReadonly() throws IOException {
         try {
-            int errorCode = mTagService.makeReadOnly(mTag.getServiceHandle());
+            int errorCode = mTagService.ndefMakeReadOnly(mTag.getServiceHandle());
             switch (errorCode) {
                 case ErrorCodes.SUCCESS:
                     return true;

core/java/android/nfc/technology/NdefFormatable.java

@@ -73,7 +73,7 @@ public void format(NdefMessage firstMessage) throws IOException, FormatException
                     // Should not happen
                     throw new IOException();
             }
-            errorCode = mTagService.write(serviceHandle, firstMessage);
+            errorCode = mTagService.ndefWrite(serviceHandle, firstMessage);
             switch (errorCode) {
                 case ErrorCodes.SUCCESS:
                     break;

core/java/android/nfc/technology/TagTechnology.java

@@ -39,42 +39,32 @@ public interface TagTechnology {
     /**
      * This object is an instance of {@link NfcF}
      */
-    public static final int NFC_F = 11;
+    public static final int NFC_F = 4;
 
     /**
      * This object is an instance of {@link NfcV}
      */
-    public static final int NFC_V = 21;
+    public static final int NFC_V = 5;
 
     /**
      * This object is an instance of {@link Ndef}
      */
-    public static final int NDEF = 101;
+    public static final int NDEF = 6;
 
     /**
      * This object is an instance of {@link NdefFormatable}
      */
-    public static final int NDEF_FORMATABLE = 110;
+    public static final int NDEF_FORMATABLE = 7;
 
     /**
      * This object is an instance of {@link MifareClassic}
      */
-    public static final int MIFARE_CLASSIC = 200;
-
-    /**
-     * A Mifare Classic tag with NDEF data
-     */
-    public static final int MIFARE_CLASSIC_NDEF = 201;
+    public static final int MIFARE_CLASSIC = 8;
 
     /**
      * This object is an instance of {@link MifareUltralight}
      */
-    public static final int MIFARE_ULTRALIGHT = 202;
-
-    /**
-     * A Mifare DESFire tag
-     */
-    public static final int MIFARE_DESFIRE = 203;
+    public static final int MIFARE_ULTRALIGHT = 9;
 
     /**
      * Returns the technology type for this tag connection.