Adding "Install Other Apps" in App Info page

Added a preference link to manage external sources in the app info
screen just like other special access permissions.

Test: Manually checked that the link appears on apps once their app op
is set to allow or deny.
Also, added some basic robolectric unit tests:
make -j32 RunSettingsRoboTests

Bug: 35481942
Change-Id: If687778b7a64fb7d278508b78d06272253a98e3e

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

@@ -123,9 +123,8 @@ public class AppStateInstallAppsBridge extends AppStateBaseBridge {
             }
         }
 
-        public int getSummary() {
+        public boolean isPotentialAppSource() {
-            return canInstallApps() ? R.string.external_source_trusted
+            return appOpMode != AppOpsManager.MODE_DEFAULT || permissionRequested;
-                    : R.string.external_source_untrusted;
         }
 
         @Override
@@ -150,7 +149,7 @@ public class AppStateInstallAppsBridge extends AppStateBaseBridge {
                 return false;
             }
             InstallAppsState state = (InstallAppsState) info.extraInfo;
-            return (state.appOpMode != AppOpsManager.MODE_DEFAULT) || state.permissionRequested;
+            return state.isPotentialAppSource();
         }
     };
 }

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

@@ -27,6 +27,7 @@ import android.support.v7.preference.Preference.OnPreferenceChangeListener;
 
 import com.android.settings.R;
 import com.android.settings.applications.AppStateInstallAppsBridge.InstallAppsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
 
 public class ExternalSourcesDetails extends AppInfoWithHeader
         implements OnPreferenceChangeListener {
@@ -74,6 +75,18 @@ public class ExternalSourcesDetails extends AppInfoWithHeader
         return false;
     }
 
+    static CharSequence getPreferenceSummary(Context context, AppEntry entry) {
+        final InstallAppsState appsState;
+        if (entry.extraInfo instanceof InstallAppsState) {
+            appsState = (InstallAppsState) entry.extraInfo;
+        } else {
+            appsState = new AppStateInstallAppsBridge(context, null, null)
+                    .createInstallAppsStateFor(entry.info.packageName, entry.info.uid);
+        }
+        return context.getString(appsState.canInstallApps() ? R.string.external_source_trusted
+                : R.string.external_source_untrusted);
+    }
+
     private void setCanInstallApps(boolean newState) {
         mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
                 mPackageInfo.applicationInfo.uid, mPackageName,

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

@@ -969,7 +969,9 @@ public class InstalledAppDetails extends AppInfoBase
                 PictureInPictureSettings.checkPackageHasPictureInPictureActivities(
                         packageInfoWithActivities.packageName,
                         packageInfoWithActivities.activities);
-        if (hasDrawOverOtherApps || hasWriteSettings || hasPictureInPictureActivities) {
+        boolean isPotentialAppSource = isPotentialAppSource();
+        if (hasDrawOverOtherApps || hasWriteSettings || hasPictureInPictureActivities ||
+                isPotentialAppSource) {
             PreferenceCategory category = new PreferenceCategory(getPrefContext());
             category.setTitle(R.string.advanced_apps);
             screen.addPreference(category);
@@ -1019,11 +1021,32 @@ public class InstalledAppDetails extends AppInfoBase
                 });
                 category.addPreference(pref);
             }
+            if (isPotentialAppSource) {
+                Preference pref = new Preference(getPrefContext());
+                pref.setTitle(R.string.install_other_apps);
+                pref.setKey("install_other_apps");
+                pref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+                    @Override
+                    public boolean onPreferenceClick(Preference preference) {
+                        startAppInfoFragment(ExternalSourcesDetails.class,
+                                getString(R.string.install_other_apps));
+                        return true;
+                    }
+                });
+                category.addPreference(pref);
+            }
         }
 
         addAppInstallerInfoPref(screen);
     }
 
+    private boolean isPotentialAppSource() {
+        AppStateInstallAppsBridge.InstallAppsState appState =
+                new AppStateInstallAppsBridge(getContext(), null, null)
+                        .createInstallAppsStateFor(mPackageName, mPackageInfo.applicationInfo.uid);
+        return appState.isPotentialAppSource();
+    }
+
     private void addAppInstallerInfoPref(PreferenceScreen screen) {
         String installerPackageName = null;
         try {
@@ -1109,6 +1132,10 @@ public class InstalledAppDetails extends AppInfoBase
         if (pref != null) {
             pref.setSummary(WriteSettingsDetails.getSummary(getContext(), mAppEntry));
         }
+        pref = findPreference("install_other_apps");
+        if (pref != null) {
+            pref.setSummary(ExternalSourcesDetails.getPreferenceSummary(getContext(), mAppEntry));
+        }
     }
 
     public static void setupAppSnippet(View appSnippet, CharSequence label, Drawable icon,

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

@@ -1373,8 +1373,8 @@ public class ManageApplications extends InstrumentedPreferenceFragment
                     break;
 
                 case LIST_TYPE_MANAGE_SOURCES:
-                    holder.summary
+                    holder.summary.setText(ExternalSourcesDetails.getPreferenceSummary(mContext,
-                            .setText(((InstallAppsState) holder.entry.extraInfo).getSummary());
+                            holder.entry));
                     break;
 
                 default:

tests/robotests/src/com/android/settings/applications/AppStateInstallAppsBridgeTest.java

@@ -0,0 +1,62 @@
+/*
+ * 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 static com.google.common.truth.Truth.assertThat;
+
+import android.app.AppOpsManager;
+
+import com.android.settings.R;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class AppStateInstallAppsBridgeTest {
+
+    @Test
+    public void testInstallAppsStateCanInstallApps() {
+        AppStateInstallAppsBridge.InstallAppsState appState = new AppStateInstallAppsBridge
+                .InstallAppsState();
+        assertThat(appState.canInstallApps()).isFalse();
+
+        appState.permissionGranted = true;
+        appState.permissionRequested = true;
+        assertThat(appState.canInstallApps()).isTrue();
+
+        appState.appOpMode = AppOpsManager.MODE_ERRORED;
+        assertThat(appState.canInstallApps()).isFalse();
+    }
+
+    @Test
+    public void testInstallAppsStateIsPotentialAppSource() {
+        AppStateInstallAppsBridge.InstallAppsState appState = new AppStateInstallAppsBridge
+                .InstallAppsState();
+        assertThat(appState.isPotentialAppSource()).isFalse();
+
+        appState.appOpMode = AppOpsManager.MODE_ERRORED;
+        assertThat(appState.isPotentialAppSource()).isTrue();
+
+        appState.permissionRequested = true;
+        appState.appOpMode = AppOpsManager.MODE_DEFAULT;
+        assertThat(appState.isPotentialAppSource()).isTrue();
+    }
+}

tests/robotests/src/com/android/settings/applications/ExternalSourcesDetailsTest.java

@@ -0,0 +1,65 @@
+/*
+ * 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 static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settingslib.applications.ApplicationsState;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class ExternalSourcesDetailsTest {
+
+    @Mock
+    private Context mContext;
+    @Mock
+    private AppStateInstallAppsBridge.InstallAppsState mInstallAppsStateAllowed;
+    @Mock
+    private AppStateInstallAppsBridge.InstallAppsState mInstallAppsStateBlocked;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        when(mInstallAppsStateAllowed.canInstallApps()).thenReturn(true);
+        when(mInstallAppsStateBlocked.canInstallApps()).thenReturn(false);
+    }
+
+    @Test
+    public void testGetPreferenceSummary() {
+        ApplicationsState.AppEntry appEntry = mock(ApplicationsState.AppEntry.class);
+        appEntry.extraInfo = mInstallAppsStateBlocked;
+        ExternalSourcesDetails.getPreferenceSummary(mContext, appEntry);
+        verify(mContext).getString(R.string.external_source_untrusted);
+        appEntry.extraInfo = mInstallAppsStateAllowed;
+        ExternalSourcesDetails.getPreferenceSummary(mContext, appEntry);
+        verify(mContext).getString(R.string.external_source_trusted);
+    }
+}