Settings for NFC Unlock

Change-Id: Ifaa2717da6c364daa7af073e42fc8f6a097c14bb

src/com/android/settings/PairNfcDevice.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2013 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.settings;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.PendingIntent;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.nfc.NfcAdapter;
+import android.nfc.NfcUnlock;
+import android.nfc.Tag;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.PowerManager;
+import android.provider.Settings;
+import android.view.Menu;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+public class PairNfcDevice extends Activity {
+    private static String TAG = PairNfcDevice.class.getName();
+
+    private TextView mStatusText;
+    private ImageView mStatusImage;
+
+    private PendingIntent mPendingIntent;
+    private NfcAdapter mAdapter;
+
+    private Handler mHandler = new Handler();
+    private PowerManager.WakeLock mWakeLock;
+
+    private NfcUnlock mNfcUnlock;
+
+    // If pairing fails, we immediately get a new intent that would not leave time for the user to
+    // read the error message.  So we'll just drop it and the user has to try again.
+    // TEST
+    private boolean mWaitingForDeviceDelayed;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_nfc_pairing);
+
+        mStatusText = (TextView) findViewById(R.id.status_text);
+        mStatusImage = (ImageView) findViewById(R.id.status_image);
+
+        mAdapter = NfcAdapter.getDefaultAdapter(this);
+        mPendingIntent = PendingIntent.getActivity(
+                this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
+
+        mNfcUnlock = NfcUnlock.getInstance(mAdapter);
+
+        setWaitingForDeviceMode();
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        return false;
+    }
+
+    public void onPause() {
+        super.onPause();
+        mAdapter.disableForegroundDispatch(this);
+        if (mWakeLock != null) {
+            mWakeLock.release();
+        }
+    }
+
+    public void onResume() {
+        super.onResume();
+
+        if (!mAdapter.isEnabled()) {
+            // We need the user to start NFC.
+            AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
+            dialogBuilder.setMessage(R.string.enable_nfc);
+            dialogBuilder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int id) {
+                    startActivity(new Intent(Settings.ACTION_NFC_SETTINGS));
+                }
+            });
+            dialogBuilder.show();
+        }
+
+        mAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);
+
+        if (mWakeLock == null) {
+            PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
+            mWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, TAG);
+        }
+        mWakeLock.acquire();
+    }
+
+    @Override
+    public void onNewIntent(Intent intent) {
+        Tag tag = (Tag) intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+        if (!mWaitingForDeviceDelayed) {
+            processTag(tag);
+        }
+    }
+
+    private void processTag(Tag tag) {
+        if (mNfcUnlock.registerTag(tag)) {
+            setPairingSucceededMode();
+        } else {
+            setPairingFailedMode();
+        }
+    }
+
+    private void setWaitingForDeviceModeDelayed(int delayInMs) {
+        mWaitingForDeviceDelayed = true;
+        mHandler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                mWaitingForDeviceDelayed = false;
+                setWaitingForDeviceMode();
+            }
+        }, delayInMs);
+    }
+
+    private void setWaitingForDeviceMode() {
+        mStatusImage.setImageResource(R.drawable.no_ring_detected);
+        mStatusText.setText(R.string.status_no_ring_detected);
+    }
+
+    private void setPairingFailedMode() {
+        setErrorMode(R.string.status_error_pairing_failed);
+    }
+
+    private void setPairingSucceededMode() {
+        mStatusImage.setImageResource(R.drawable.ring_paired);
+        mStatusText.setText(R.string.status_device_paired);
+
+        // Automatically quit.
+        mHandler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                finish();
+            }
+        }, 4000);
+    }
+
+    private void setErrorMode(int errorMsgResourceId) {
+        mStatusText.setText(errorMsgResourceId);
+        setWaitingForDeviceModeDelayed(2500);
+    }
+}