b/2142065 Added Bluetooth API to allow developer to request the user's permission to enable discovery mode.

Change-Id: I6da1598661ad05b4cfd2b7cc81e05d3053df5777

src/com/android/settings/bluetooth/RequestPermissionHelperActivity.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2009 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.bluetooth;
+
+import android.bluetooth.BluetoothAdapter;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.TextView;
+
+import com.android.internal.app.AlertActivity;
+import com.android.internal.app.AlertController;
+import com.android.settings.R;
+
+/**
+ * RequestPermissionHelperActivity asks the user whether to enable discovery.
+ * This is usually started by RequestPermissionActivity.
+ */
+public class RequestPermissionHelperActivity extends AlertActivity implements
+        DialogInterface.OnClickListener {
+    private static final String TAG = "RequestPermissionHelperActivity";
+
+    public static final String ACTION_INTERNAL_REQUEST_BT_ON =
+        "com.android.settings.bluetooth.ACTION_INTERNAL_REQUEST_BT_ON";
+
+    public static final String ACTION_INTERNAL_REQUEST_BT_ON_AND_DISCOVERABLE =
+        "com.android.settings.bluetooth.ACTION_INTERNAL_REQUEST_BT_ON_AND_DISCOVERABLE";
+
+    private LocalBluetoothManager mLocalManager;
+
+    private int mTimeout;
+
+    // True if requesting BT to be turned on
+    // False if requesting BT to be turned on + discoverable mode
+    private boolean mEnableOnly;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (parseIntent()) {
+            finish();
+            return;
+        }
+
+        createDialog();
+    }
+
+    void createDialog() {
+        final AlertController.AlertParams p = mAlertParams;
+        p.mIconId = android.R.drawable.ic_dialog_info;
+        p.mTitle = getString(R.string.bluetooth_permission_request);
+
+        View view = getLayoutInflater().inflate(R.layout.bluetooth_discoverable, null);
+        p.mView = view;
+        TextView tv = (TextView) view.findViewById(R.id.message);
+
+        if (mEnableOnly) {
+            tv.setText(getString(R.string.bluetooth_ask_enablement));
+        } else {
+            tv.setText(getString(R.string.bluetooth_ask_enablement_and_discovery, mTimeout));
+        }
+
+        p.mPositiveButtonText = getString(R.string.yes);
+        p.mPositiveButtonListener = this;
+        p.mNegativeButtonText = getString(R.string.no);
+        p.mNegativeButtonListener = this;
+
+        setupAlert();
+    }
+
+    public void onClick(DialogInterface dialog, int which) {
+        int returnCode;
+        switch (which) {
+            case DialogInterface.BUTTON_POSITIVE:
+                int btState = 0;
+
+                try {
+                    // TODO There's a better way.
+                    int retryCount = 30;
+                    do {
+                        btState = mLocalManager.getBluetoothState();
+                        Thread.sleep(100);
+                    } while (btState == BluetoothAdapter.STATE_TURNING_OFF && --retryCount > 0);
+                } catch (InterruptedException e) {
+                    // don't care
+                }
+
+                if (btState == BluetoothAdapter.STATE_TURNING_ON
+                        || btState == BluetoothAdapter.STATE_ON
+                        || mLocalManager.getBluetoothAdapter().enable()) {
+                    returnCode = RequestPermissionActivity.RESULT_BT_STARTING_OR_STARTED;
+                } else {
+                    returnCode = RequestPermissionActivity.RESULT_ERROR;
+                }
+                break;
+
+            case DialogInterface.BUTTON_NEGATIVE:
+                returnCode = RequestPermissionActivity.RESULT_USER_DENIED;
+                break;
+            default:
+                return;
+        }
+        setResult(returnCode);
+    }
+
+    private boolean parseIntent() {
+        Intent intent = getIntent();
+        if (intent != null && intent.getAction().equals(ACTION_INTERNAL_REQUEST_BT_ON)) {
+            mEnableOnly = true;
+        } else if (intent != null
+                && intent.getAction().equals(ACTION_INTERNAL_REQUEST_BT_ON_AND_DISCOVERABLE)) {
+            mEnableOnly = false;
+            // Value used for display purposes. Not range checking.
+            mTimeout = intent.getIntExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,
+                    BluetoothDiscoverableEnabler.DEFAULT_DISCOVERABLE_TIMEOUT);
+        } else {
+            setResult(RequestPermissionActivity.RESULT_ERROR);
+            return true;
+        }
+
+        mLocalManager = LocalBluetoothManager.getInstance(this);
+        if (mLocalManager == null) {
+            Log.e(TAG, "Error: there's a problem starting bluetooth");
+            setResult(RequestPermissionActivity.RESULT_ERROR);
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    public void onBackPressed() {
+        setResult(RequestPermissionActivity.RESULT_USER_DENIED);
+        super.onBackPressed();
+    }
+}