Adding Manage External Sources Settings

Added a settings fragment to manage external sources. It lists all
applications that have either requested REQUEST_INSTALL_PACKAGES or have
their app op changed from default.

Test: Will include in follow-up CL. Tracked in b/33792674

Bug: 31002700
Change-Id: Ibd2a1922be214b62aec4eefa45f7b9691256b205

src/com/android/settings/applications/ExternalSourcesDetails.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2017 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.applications;
+
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+
+import android.app.AlertDialog;
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.Preference.OnPreferenceChangeListener;
+
+import com.android.settings.R;
+import com.android.settings.applications.AppStateInstallAppsBridge.InstallAppsState;
+
+public class ExternalSourcesDetails extends AppInfoWithHeader
+        implements OnPreferenceChangeListener {
+
+    private static final String KEY_EXTERNAL_SOURCES_SETTINGS_SWITCH =
+            "external_sources_settings_switch";
+    private static final String KEY_EXTERNAL_SOURCES_SETTINGS_DESC =
+            "external_sources_settings_description";
+
+    private AppStateInstallAppsBridge mAppBridge;
+    private AppOpsManager mAppOpsManager;
+    private SwitchPreference mSwitchPref;
+    private Preference mExternalSourcesSettingsDesc;
+    private InstallAppsState mInstallAppsState;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Context context = getActivity();
+        mAppBridge = new AppStateInstallAppsBridge(context, mState, null);
+        mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
+
+        addPreferencesFromResource(R.xml.external_sources_details);
+        mSwitchPref = (SwitchPreference) findPreference(KEY_EXTERNAL_SOURCES_SETTINGS_SWITCH);
+        mExternalSourcesSettingsDesc = findPreference(KEY_EXTERNAL_SOURCES_SETTINGS_DESC);
+
+        getPreferenceScreen().setTitle(R.string.install_other_apps);
+        mSwitchPref.setTitle(R.string.external_source_switch_title);
+        mExternalSourcesSettingsDesc.setSummary(R.string.install_all_warning);
+
+        mSwitchPref.setOnPreferenceChangeListener(this);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean checked = (Boolean) newValue;
+        if (preference == mSwitchPref) {
+            if (mInstallAppsState != null && checked != mInstallAppsState.canInstallApps()) {
+                setCanInstallApps(checked);
+                refreshUi();
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void setCanInstallApps(boolean newState) {
+        mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
+                mPackageInfo.applicationInfo.uid, mPackageName,
+                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
+    }
+
+    @Override
+    protected boolean refreshUi() {
+        mInstallAppsState = mAppBridge.createInstallAppsStateFor(mPackageName,
+                mPackageInfo.applicationInfo.uid);
+
+        final boolean canWrite = mInstallAppsState.canInstallApps();
+        mSwitchPref.setChecked(canWrite);
+        return true;
+    }
+
+    @Override
+    protected AlertDialog createDialog(int id, int errorCode) {
+        return null;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsEvent.MANAGE_EXTERNAL_SOURCES;
+    }
+}