NFC技术：让Android自动运行程序

 1 //实现向NFC标签写入包，然后将NFC靠近手机背面摄像头位置，自动运行写入的程序
 2 public class RunAppActivity extends Activity {
 3     private Button button;
 4     private String mpackage;
 5     private NfcAdapter nfcAdapter;
 6     private PendingIntent mPendingIntent;
 7 
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         // TODO Auto-generated method stub
11         super.onCreate(savedInstanceState);
12 
13         setContentView(R.layout.fragment_main);
14         button = (Button) findViewById(R.id.button1);
15         nfcAdapter = NfcAdapter.getDefaultAdapter(this);
16         mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
17                 getClass()), 0);
18 
19     }
20 
21     @Override
22     protected void onNewIntent(Intent intent) {
23         // TODO Auto-generated method stub
24         // 当清单文件中设置为"singleTop"时，oncreate（）只调用一次，而onNewIntent（）每次调用
25         super.onNewIntent(intent);
26         if (mpackage == null)
27             return;
28         // 第一步获得Tag
29         Tag detectetTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
30         // 第二步写入标签
31         writeNFCTag(detectetTag);
32     }
33 
34     private void writeNFCTag(Tag tag) {
35         // TODO Auto-generated method stub
36         if (tag == null) {
37             return;
38         }
39 
40         NdefMessage ndefMessage = new NdefMessage(
41                 new NdefRecord[] { NdefRecord.createApplicationRecord(mpackage) });
42 
43         int size = ndefMessage.toByteArray().length;
44         try {
45             Ndef ndef = Ndef.get(tag);
46             if (ndef != null) {
47                 ndef.connect();
48                 // 是否支持可写
49                 if (!ndef.isWritable()) {
50                     return;
51                 }
52                 // 判断是否可以容纳要写入的数据
53                 if (ndef.getMaxSize() < size) {
54                     return;
55                 }
56                 ndef.writeNdefMessage(ndefMessage);
57                 Toast.makeText(this, "NFC成功写入", 0).show();
58             }
59         } catch (Exception e) {
60             // TODO: handle exception
61         }
62     }
63 
64     @Override
65     protected void onResume() {
66         // TODO Auto-generated method stub
67         super.onResume();
68         // 获得焦点， 设置这个窗口优先级高于所有可以处理NFC的窗口
69         if (nfcAdapter != null) {
70             nfcAdapter.enableForegroundDispatch(this, mPendingIntent, null,
71                     null);
72         }
73     }
74 
75     @Override
76     protected void onPause() {
77         // TODO Auto-generated method stub
78         super.onPause();
79         // 程序退出，窗口恢复默认
80         if (nfcAdapter != null) {
81             nfcAdapter.disableForegroundDispatch(this);
82         }
83     }
84 
85     public void onclick(View view) {
86         Intent intent = new Intent(this, InstallAppListActivity.class);
87         startActivityForResult(intent, 0);
88     }
89 }

 1 //显示所有安装的包
 2 public class InstallAppListActivity extends ListActivity implements
 3         OnItemClickListener {
 4     private List<String> mpackages = new ArrayList<String>();
 5 
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         // TODO Auto-generated method stub
 9         super.onCreate(savedInstanceState);
10         PackageManager manager = getPackageManager();
11         List<PackageInfo> packageInfos = manager
12                 .getInstalledPackages(PackageManager.GET_ACTIVITIES);
13 
14         for (PackageInfo packageInfo : packageInfos) {
15             mpackages.add(packageInfo.applicationInfo.loadLabel(manager) + "
"
16                     + packageInfo.packageName);
17 
18         }
19         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
20                 android.R.layout.simple_list_item_1, android.R.id.text1,
21                 mpackages);
22         setListAdapter(adapter);
23         getListView().setOnItemClickListener(this);
24     }
25 
26     @Override
27     public void onItemClick(AdapterView<?> parent, View view, int position,
28             long id) {
29         Intent intent = new Intent();
30         intent.putExtra("Packagename", mpackages.get(position));
31         setResult(1, intent);
32         finish();
33     }
34 
35 }