Update AP preference to not be master switch pref

People keep getting confused by the master switch preference for
wireless tethering. The wireless tethering page already has a switch
so this just removes it from the preference and has it take you to
the page when tapped on instead.

Bug: 69423941
Test: robotests
Change-Id: I66d6d3271e83b49ae77f203e7892438d27f96025

res/xml/tether_prefs.xml

@@ -19,7 +19,7 @@
     xmlns:settings="http://schemas.android.com/apk/res-auto"
     android:title="@string/tether_settings_title_all">
 
-    <com.android.settings.widget.MasterSwitchPreference
+    <Preference
         android:key="wifi_tether"
         android:title="@string/wifi_hotspot_checkbox_text"
         android:summary="@string/summary_two_lines_placeholder"

src/com/android/settings/wifi/tether/WifiTetherPreferenceController.java

@@ -25,14 +25,13 @@ import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiManager;
 import android.provider.Settings;
 import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 import android.text.BidiFormatter;
 
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.PreferenceControllerMixin;
-import com.android.settings.widget.MasterSwitchController;
-import com.android.settings.widget.MasterSwitchPreference;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
@@ -50,10 +49,9 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
     private final String[] mWifiRegexs;
     private final WifiManager mWifiManager;
     private final Lifecycle mLifecycle;
-    private WifiTetherSwitchBarController mSwitchController;
     private int mSoftApState;
     @VisibleForTesting
-    MasterSwitchPreference mPreference;
+    Preference mPreference;
     @VisibleForTesting
     WifiTetherSoftApManager mWifiTetherSoftApManager;
 
@@ -88,14 +86,11 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
-        mPreference = (MasterSwitchPreference) screen.findPreference(WIFI_TETHER_SETTINGS);
+        mPreference = screen.findPreference(WIFI_TETHER_SETTINGS);
         if (mPreference == null) {
             // unavailable
             return;
         }
-        mSwitchController = new WifiTetherSwitchBarController(
-                mContext, new MasterSwitchController(mPreference));
-        mLifecycle.addObserver(mSwitchController);
     }
 
     @Override

tests/robotests/src/com/android/settings/wifi/tether/WifiTetherPreferenceControllerTest.java

@@ -122,48 +122,6 @@ public class WifiTetherPreferenceControllerTest {
         assertThat(mController.isAvailable()).isTrue();
     }
 
-    @Test
-    public void startAndStop_shouldRegisterUnregisterReceiver() {
-        final BroadcastReceiver receiver = ReflectionHelpers.getField(mController, "mReceiver");
-
-        mLifecycle.handleLifecycleEvent(ON_START);
-        mLifecycle.handleLifecycleEvent(ON_STOP);
-
-        assertThat(ShadowWifiTetherSwitchBarController.onStartCalled).isTrue();
-        assertThat(ShadowWifiTetherSwitchBarController.onStopCalled).isTrue();
-        verify(mContext).registerReceiver(eq(receiver), any(IntentFilter.class));
-        verify(mContext).unregisterReceiver(receiver);
-    }
-
-    @Test
-    public void start_wifiApOff_shouldSetInitialStateToOff() {
-        when(mWifiManager.getWifiApState()).thenReturn(WifiManager.WIFI_AP_STATE_DISABLED);
-        final BroadcastReceiver receiver = ReflectionHelpers.getField(mController, "mReceiver");
-        final MasterSwitchPreference pref = mock(MasterSwitchPreference.class);
-        when(mScreen.findPreference(anyString())).thenReturn(pref);
-
-        mController.displayPreference(mScreen);
-        mLifecycle.handleLifecycleEvent(ON_START);
-
-        verify(mContext).registerReceiver(eq(receiver), any(IntentFilter.class));
-        verify(pref).setChecked(false);
-    }
-
-    @Test
-    public void start_wifiApOn_shouldSetInitialStateToOn() {
-        when(mWifiManager.getWifiApState()).thenReturn(WifiManager.WIFI_AP_STATE_ENABLED);
-        final BroadcastReceiver receiver = ReflectionHelpers.getField(mController, "mReceiver");
-        final MasterSwitchPreference pref = mock(MasterSwitchPreference.class);
-        when(mScreen.findPreference(anyString())).thenReturn(pref);
-
-        mController.displayPreference(mScreen);
-        mLifecycle.handleLifecycleEvent(ON_START);
-
-        assertThat(ShadowWifiTetherSwitchBarController.onStartCalled).isTrue();
-        verify(mContext).registerReceiver(eq(receiver), any(IntentFilter.class));
-        verify(pref).setChecked(true);
-    }
-
     @Test
     public void testReceiver_goingToAirplaneMode_shouldClearPreferenceSummary() {
         final ContentResolver cr = mock(ContentResolver.class);