First pass at USB-only tether settings.

bug:2281900

src/com/android/settings/TetherSettings.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2008 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.os.Bundle;
+import android.os.SystemProperties;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceScreen;
+import android.preference.CheckBoxPreference;
+import android.provider.Settings;
+import android.util.Log;
+
+/*
+ * Displays preferences for Tethering.
+ */
+public class TetherSettings extends PreferenceActivity {
+
+    private static final String ENABLE_TETHER_NOTICE = "enable_tether_notice";
+    private static final String USB_TETHER_SETTINGS = "usb_tether_settings";
+
+    private CheckBoxPreference mEnableTetherNotice;
+    private PreferenceScreen mUsbTether;
+
+    private BroadcastReceiver mTetherChangeReceiver;
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        addPreferencesFromResource(R.xml.tether_prefs);
+
+        mEnableTetherNotice = (CheckBoxPreference) findPreference(ENABLE_TETHER_NOTICE);
+        mUsbTether = (PreferenceScreen) findPreference(USB_TETHER_SETTINGS);
+    }
+
+    private class TetherChangeReceiver extends BroadcastReceiver {
+        public void onReceive(Context content, Intent intent) {
+            updateState(intent.getIntExtra(ConnectivityManager.EXTRA_AVAILABLE_TETHER_COUNT,0)>0,
+                    intent.getIntExtra(ConnectivityManager.EXTRA_ACTIVE_TETHER_COUNT,0)>0);
+        }
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mEnableTetherNotice.setChecked(Settings.Secure.getInt(getContentResolver(),
+                Settings.Secure.TETHER_NOTIFY, 0) != 0);
+
+        IntentFilter filter = new IntentFilter(ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
+        mTetherChangeReceiver = new TetherChangeReceiver();
+        registerReceiver(mTetherChangeReceiver, filter);
+
+        ConnectivityManager cm =
+                (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
+        updateState(cm.getTetherableIfaces().length>0, cm.getTetheredIfaces().length>0);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        unregisterReceiver(mTetherChangeReceiver);
+        mTetherChangeReceiver = null;
+    }
+
+    private void updateState(boolean isAvailable, boolean isTethered) {
+        if (isTethered) {
+            mUsbTether.setSummary(R.string.usb_tethering_active_subtext);
+            mUsbTether.setEnabled(true);
+        } else if (isAvailable) {
+            mUsbTether.setSummary(R.string.usb_tethering_available_subtext);
+            mUsbTether.setEnabled(true);
+        } else {
+            mUsbTether.setSummary(R.string.usb_tethering_unavailable_subtext);
+            mUsbTether.setEnabled(false);
+        }
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
+
+        if (preference == mEnableTetherNotice) {
+            boolean newState = mEnableTetherNotice.isChecked();
+            Settings.Secure.putInt(getContentResolver(),
+                    Settings.Secure.TETHER_NOTIFY, newState ? 1 : 0);
+            return true;
+        }
+        return false;
+    }
+
+}