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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.nfc;
import java.util.ArrayList;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManagerNative;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.ClipData;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.nfc.BeamShareData;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.RemoteException;
import android.util.Log;
import android.util.EventLog;
import android.webkit.URLUtil;
import android.Manifest.permission;
import com.android.internal.R;
/**
* This class is registered by NfcService to handle
* ACTION_SHARE intents. It tries to parse data contained
* in ACTION_SHARE intents in either a content/file Uri,
* which can be sent using NFC handover, or alternatively
* it tries to parse texts and URLs to store them in a simple
* Text or Uri NdefRecord. The data is then passed on into
* NfcService to transmit on NFC tap.
*
*/
public class BeamShareActivity extends Activity {
static final String TAG ="BeamShareActivity";
static final boolean DBG = false;
ArrayList<Uri> mUris;
NdefMessage mNdefMessage;
NfcAdapter mNfcAdapter;
Intent mLaunchIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUris = new ArrayList<Uri>();
mNdefMessage = null;
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mLaunchIntent = getIntent();
if (mNfcAdapter == null) {
Log.e(TAG, "NFC adapter not present.");
finish();
} else {
if (!mNfcAdapter.isEnabled()) {
showNfcDialogAndExit(com.android.nfc.R.string.beam_requires_nfc_enabled);
} else {
parseShareIntentAndFinish(mLaunchIntent);
}
}
}
private void showNfcDialogAndExit(int msgId) {
IntentFilter filter = new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
registerReceiverAsUser(mReceiver, UserHandle.ALL, filter, null, null);
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this,
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
dialogBuilder.setMessage(msgId);
dialogBuilder.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialogInterface) {
finish();
}
});
dialogBuilder.setPositiveButton(R.string.yes,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
if (!mNfcAdapter.isEnabled()) {
mNfcAdapter.enable();
// Wait for enable broadcast
} else {
parseShareIntentAndFinish(mLaunchIntent);
}
}
});
dialogBuilder.setNegativeButton(R.string.no,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
dialogBuilder.show();
}
void tryUri(Uri uri) {
if (uri.getScheme().equalsIgnoreCase("content") ||
uri.getScheme().equalsIgnoreCase("file")) {
// Typically larger data, this can be shared using NFC handover
mUris.add(uri);
} else {
// Just put this Uri in an NDEF message
mNdefMessage = new NdefMessage(NdefRecord.createUri(uri));
}
}
void tryText(String text) {
if (URLUtil.isValidUrl(text)) {
Uri parsedUri = Uri.parse(text);
tryUri(parsedUri);
} else {
mNdefMessage = new NdefMessage(NdefRecord.createTextRecord(null, text));
}
}
public void parseShareIntentAndFinish(Intent intent) {
if (intent == null || (!intent.getAction().equalsIgnoreCase(Intent.ACTION_SEND) &&
!intent.getAction().equalsIgnoreCase(Intent.ACTION_SEND_MULTIPLE))) return;
// First, see if the intent contains clip-data, and if so get data from there
ClipData clipData = intent.getClipData();
if (clipData != null && clipData.getItemCount() > 0) {
for (int i = 0; i < clipData.getItemCount(); i++) {
ClipData.Item item = clipData.getItemAt(i);
// First try to get an Uri
Uri uri = item.getUri();
String plainText = item.coerceToText(this).toString();
if (uri != null) {
if (DBG) Log.d(TAG, "Found uri in ClipData.");
tryUri(uri);
} else if (plainText != null) {
if (DBG) Log.d(TAG, "Found text in ClipData.");
tryText(plainText);
} else {
if (DBG) Log.d(TAG, "Did not find any shareable data in ClipData.");
}
}
} else {
if (intent.getAction().equalsIgnoreCase(Intent.ACTION_SEND)) {
final Uri uri = intent.getParcelableExtra(Intent.EXTRA_STREAM);
final CharSequence text = intent.getCharSequenceExtra(Intent.EXTRA_TEXT);
if (uri != null) {
if (DBG) Log.d(TAG, "Found uri in ACTION_SEND intent.");
tryUri(uri);
} else if (text != null) {
if (DBG) Log.d(TAG, "Found EXTRA_TEXT in ACTION_SEND intent.");
tryText(text.toString());
} else {
if (DBG) Log.d(TAG, "Did not find any shareable data in ACTION_SEND intent.");
}
} else {
final ArrayList<Uri> uris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
final ArrayList<CharSequence> texts = intent.getCharSequenceArrayListExtra(
Intent.EXTRA_TEXT);
if (uris != null && uris.size() > 0) {
for (Uri uri : uris) {
if (DBG) Log.d(TAG, "Found uri in ACTION_SEND_MULTIPLE intent.");
tryUri(uri);
}
} else if (texts != null && texts.size() > 0) {
// Try EXTRA_TEXT, but just for the first record
if (DBG) Log.d(TAG, "Found text in ACTION_SEND_MULTIPLE intent.");
tryText(texts.get(0).toString());
} else {
if (DBG) Log.d(TAG, "Did not find any shareable data in " +
"ACTION_SEND_MULTIPLE intent.");
}
}
}
BeamShareData shareData = null;
UserHandle myUserHandle = new UserHandle(UserHandle.myUserId());
if (mUris.size() > 0) {
// Uris have our first preference for sharing
Uri[] uriArray = new Uri[mUris.size()];
int numValidUris = 0;
for (Uri uri : mUris) {
try {
int uid = ActivityManagerNative.getDefault().getLaunchedFromUid(getActivityToken());
if (uri.getScheme().equalsIgnoreCase("file") &&
getApplicationContext().checkPermission(permission.READ_EXTERNAL_STORAGE, -1, uid) !=
PackageManager.PERMISSION_GRANTED) {
Log.e(TAG, "File based Uri doesn't have External Storage Permission.");
EventLog.writeEvent(0x534e4554, "37287958", uid, uri.getPath());
break;
}
grantUriPermission("com.android.nfc", uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
uriArray[numValidUris++] = uri;
if (DBG) Log.d(TAG, "Found uri: " + uri);
} catch (SecurityException e) {
Log.e(TAG, "Security exception granting uri permission to NFC process.");
break;
} catch (RemoteException e) {
Log.e(TAG, "Remote exception accessing uid of the calling process.");
break;
}
}
if (numValidUris != 0 && numValidUris == mUris.size()) {
shareData = new BeamShareData(null, uriArray, myUserHandle, 0);
} else {
// No uris left
shareData = new BeamShareData(null, null, myUserHandle, 0);
}
} else if (mNdefMessage != null) {
shareData = new BeamShareData(mNdefMessage, null, myUserHandle, 0);
if (DBG) Log.d(TAG, "Created NDEF message:" + mNdefMessage.toString());
} else {
if (DBG) Log.d(TAG, "Could not find any data to parse.");
// Activity may have set something to share over NFC, so pass on anyway
shareData = new BeamShareData(null, null, myUserHandle, 0);
}
mNfcAdapter.invokeBeam(shareData);
finish();
}
final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGED.equals(intent.getAction())) {
int state = intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE,
NfcAdapter.STATE_OFF);
if (state == NfcAdapter.STATE_ON) {
parseShareIntentAndFinish(mLaunchIntent);
}
}
}
};
}
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