Add UsbDefaultFragment and tests

Replace old USB screen in developer options with
UsbDefaultFragment.

Test: pass
Bug: 62876645
Change-Id: I8428a2814b7e1abd7d0fa9fa9980dbc02cfa0034

src/com/android/settings/connecteddevice/usb/UsbDefaultFragment.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2018 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.connecteddevice.usb;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.hardware.usb.UsbManager;
+import android.os.Bundle;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.R;
+import com.android.settings.Utils;
+import com.android.settings.widget.RadioButtonPickerFragment;
+import com.android.settingslib.widget.FooterPreference;
+import com.android.settingslib.widget.FooterPreferenceMixin;
+
+import com.google.android.collect.Lists;
+
+import java.util.List;
+
+/**
+ * Provides options for selecting the default USB mode.
+ */
+public class UsbDefaultFragment extends RadioButtonPickerFragment {
+    @VisibleForTesting
+    UsbBackend mUsbBackend;
+
+    private static final String[] FUNCTIONS_LIST = {
+            UsbManager.USB_FUNCTION_NONE,
+            UsbManager.USB_FUNCTION_MTP,
+            UsbManager.USB_FUNCTION_RNDIS,
+            UsbManager.USB_FUNCTION_MIDI,
+            UsbManager.USB_FUNCTION_PTP
+    };
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mUsbBackend = new UsbBackend(context);
+    }
+
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
+        FooterPreferenceMixin footer = new FooterPreferenceMixin(this, this.getLifecycle());
+        FooterPreference pref = footer.createFooterPreference();
+        pref.setTitle(R.string.usb_default_info);
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.USB_DEFAULT;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.usb_default_fragment;
+    }
+
+    @Override
+    protected List<? extends CandidateInfo> getCandidates() {
+        List<CandidateInfo> ret = Lists.newArrayList();
+        for (final String option : FUNCTIONS_LIST) {
+            int newMode = 0;
+            final String title;
+            final Context context = getContext();
+            if (option.equals(UsbManager.USB_FUNCTION_MTP)) {
+                newMode = UsbBackend.MODE_DATA_MTP;
+                title = context.getString(R.string.usb_use_file_transfers);
+            } else if (option.equals(UsbManager.USB_FUNCTION_PTP)) {
+                newMode = UsbBackend.MODE_DATA_PTP;
+                title = context.getString(R.string.usb_use_photo_transfers);
+            } else if (option.equals(UsbManager.USB_FUNCTION_MIDI)) {
+                newMode = UsbBackend.MODE_DATA_MIDI;
+                title = context.getString(R.string.usb_use_MIDI);
+            } else if (option.equals(UsbManager.USB_FUNCTION_RNDIS)) {
+                newMode = UsbBackend.MODE_DATA_TETHER;
+                title = context.getString(R.string.usb_use_tethering);
+            } else if (option.equals(UsbManager.USB_FUNCTION_NONE)) {
+                newMode = UsbBackend.MODE_DATA_NONE;
+                title = context.getString(R.string.usb_use_charging_only);
+            } else {
+                title = "";
+            }
+
+            // Only show supported and allowed options
+            if (mUsbBackend.isModeSupported(newMode)
+                    && !mUsbBackend.isModeDisallowedBySystem(newMode)
+                    && !mUsbBackend.isModeDisallowed(newMode)) {
+                ret.add(new CandidateInfo(true /* enabled */) {
+                    @Override
+                    public CharSequence loadLabel() {
+                        return title;
+                    }
+
+                    @Override
+                    public Drawable loadIcon() {
+                        return null;
+                    }
+
+                    @Override
+                    public String getKey() {
+                        return option;
+                    }
+                });
+            }
+        }
+        return ret;
+    }
+
+    @Override
+    protected String getDefaultKey() {
+        switch (mUsbBackend.getDefaultUsbMode()) {
+            case UsbBackend.MODE_DATA_MTP:
+                return UsbManager.USB_FUNCTION_MTP;
+            case UsbBackend.MODE_DATA_PTP:
+                return UsbManager.USB_FUNCTION_PTP;
+            case UsbBackend.MODE_DATA_TETHER:
+                return UsbManager.USB_FUNCTION_RNDIS;
+            case UsbBackend.MODE_DATA_MIDI:
+                return UsbManager.USB_FUNCTION_MIDI;
+            default:
+                return UsbManager.USB_FUNCTION_NONE;
+        }
+    }
+
+    @Override
+    protected boolean setDefaultKey(String key) {
+        int thisMode = UsbBackend.MODE_DATA_NONE;
+        if (key.equals(UsbManager.USB_FUNCTION_MTP)) {
+            thisMode = UsbBackend.MODE_DATA_MTP;
+        } else if (key.equals(UsbManager.USB_FUNCTION_PTP)) {
+            thisMode = UsbBackend.MODE_DATA_PTP;
+        } else if (key.equals(UsbManager.USB_FUNCTION_RNDIS)) {
+            thisMode = UsbBackend.MODE_DATA_TETHER;
+        } else if (key.equals(UsbManager.USB_FUNCTION_MIDI)) {
+            thisMode = UsbBackend.MODE_DATA_MIDI;
+        }
+        if (!Utils.isMonkeyRunning()) {
+            mUsbBackend.setDefaultUsbMode(thisMode);
+        }
+        return true;
+    }
+}