1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.example.android.nfc; 17 18 import android.app.Activity; 19 import android.content.Intent; 20 import android.nfc.NdefMessage; 21 import android.nfc.NdefRecord; 22 import android.nfc.NfcAdapter; 23 import android.os.Bundle; 24 import android.os.Parcelable; 25 import android.util.Log; 26 import android.view.LayoutInflater; 27 import android.view.WindowManager; 28 import android.widget.LinearLayout; 29 import android.widget.TextView; 30 31 import com.example.android.nfc.record.ParsedNdefRecord; 32 33 import java.util.List; 34 35 /** 36 * An {@link Activity} which handles a broadcast of a new tag that the device 37 * just discovered. 38 */ 39 public class TagViewer extends Activity { 40 41 static final String TAG = "ViewTag"; 42 43 /** 44 * This activity will finish itself in this amount of time if the user 45 * doesn't do anything. 46 */ 47 static final int ACTIVITY_TIMEOUT_MS = 1 * 1000; 48 49 TextView mTitle; 50 51 LinearLayout mTagContent; 52 53 @Override 54 protected void onCreate(Bundle savedInstanceState) { 55 super.onCreate(savedInstanceState); 56 setContentView(R.layout.tag_viewer); 57 mTagContent = (LinearLayout) findViewById(R.id.list); 58 mTitle = (TextView) findViewById(R.id.title); 59 resolveIntent(getIntent()); 60 } 61 62 void resolveIntent(Intent intent) { 63 // Parse the intent 64 String action = intent.getAction(); 65 if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) { 66 // When a tag is discovered we send it to the service to be save. We 67 // include a PendingIntent for the service to call back onto. This 68 // will cause this activity to be restarted with onNewIntent(). At 69 // that time we read it from the database and view it. 70 Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); 71 NdefMessage[] msgs; 72 if (rawMsgs != null) { 73 msgs = new NdefMessage[rawMsgs.length]; 74 for (int i = 0; i < rawMsgs.length; i++) { 75 msgs[i] = (NdefMessage) rawMsgs[i]; 76 } 77 } else { 78 // Unknown tag type 79 byte[] empty = new byte[] {}; 80 NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, empty, empty); 81 NdefMessage msg = new NdefMessage(new NdefRecord[] {record}); 82 msgs = new NdefMessage[] {msg}; 83 } 84 // Setup the views 85 setTitle(R.string.title_scanned_tag); 86 buildTagViews(msgs); 87 } else { 88 Log.e(TAG, "Unknown intent " + intent); 89 finish(); 90 return; 91 } 92 } 93 94 void buildTagViews(NdefMessage[] msgs) { 95 if (msgs == null || msgs.length == 0) { 96 return; 97 } 98 LayoutInflater inflater = LayoutInflater.from(this); 99 LinearLayout content = mTagContent; 100 // Clear out any old views in the content area, for example if you scan 101 // two tags in a row. 102 content.removeAllViews(); 103 // Parse the first message in the list 104 // Build views for all of the sub records 105 List<ParsedNdefRecord> records = NdefMessageParser.parse(msgs[0]); 106 final int size = records.size(); 107 for (int i = 0; i < size; i++) { 108 ParsedNdefRecord record = records.get(i); 109 content.addView(record.getView(this, inflater, content, i)); 110 inflater.inflate(R.layout.tag_divider, content, true); 111 } 112 } 113 114 @Override 115 public void onNewIntent(Intent intent) { 116 setIntent(intent); 117 resolveIntent(intent); 118 } 119 120 @Override 121 public void setTitle(CharSequence title) { 122 mTitle.setText(title); 123 } 124 } 125