Merge "Introduce BackgroundProcessLimitPreferenceCtrl"

/*

 * 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.development;

import android.app.ActivityManager;

import android.app.IActivityManager;

import android.content.Context;

import android.os.RemoteException;

import android.support.annotation.VisibleForTesting;

import android.support.v7.preference.ListPreference;

import android.support.v7.preference.Preference;

import android.support.v7.preference.PreferenceScreen;

import com.android.settings.R;

import com.android.settings.core.PreferenceControllerMixin;

import com.android.settingslib.development.DeveloperOptionsPreferenceController;

public class BackgroundProcessLimitPreferenceController extends

        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,

        PreferenceControllerMixin {

    private static final String APP_PROCESS_LIMIT_KEY = "app_process_limit";

    private final String[] mListValues;

    private final String[] mListSummaries;

    private ListPreference mPreference;

    public BackgroundProcessLimitPreferenceController(Context context) {

        super(context);

        mListValues = context.getResources().getStringArray(R.array.app_process_limit_values);

        mListSummaries = context.getResources().getStringArray(R.array.app_process_limit_entries);

    }

    @Override

    public String getPreferenceKey() {

        return APP_PROCESS_LIMIT_KEY;

    }

    @Override

    public void displayPreference(PreferenceScreen screen) {

        super.displayPreference(screen);

        mPreference = (ListPreference) screen.findPreference(getPreferenceKey());

    }

    @Override

    public boolean onPreferenceChange(Preference preference, Object newValue) {

        writeAppProcessLimitOptions(newValue);

        updateAppProcessLimitOptions();

        return true;

    }

    @Override

    public void updateState(Preference preference) {

        updateAppProcessLimitOptions();

    }

    @Override

    protected void onDeveloperOptionsSwitchEnabled() {

        mPreference.setEnabled(true);

    }

    @Override

    protected void onDeveloperOptionsSwitchDisabled() {

        writeAppProcessLimitOptions(null);

        mPreference.setEnabled(false);

    }

    private void updateAppProcessLimitOptions() {

        try {

            final int limit = getActivityManagerService().getProcessLimit();

            int index = 0; // default

            for (int i = 0; i < mListValues.length; i++) {

                int val = Integer.parseInt(mListValues[i]);

                if (val >= limit) {

                    index = i;

                    break;

                }

            }

            mPreference.setValue(mListValues[index]);

            mPreference.setSummary(mListSummaries[index]);

        } catch (RemoteException e) {

            // intentional no-op

        }

    }

    private void writeAppProcessLimitOptions(Object newValue) {

        try {

            final int limit = newValue != null ? Integer.parseInt(newValue.toString()) : -1;

            getActivityManagerService().setProcessLimit(limit);

            updateAppProcessLimitOptions();

        } catch (RemoteException e) {

            // intentional no-op

        }

    }

    @VisibleForTesting

    IActivityManager getActivityManagerService() {

        return ActivityManager.getService();

    }

}

        controllers.add(new StrictModePreferenceController(context));

        controllers.add(new ProfileGpuRenderingPreferenceController(context));

        controllers.add(new KeepActivitiesPreferenceController(context));

        // background process limit

        controllers.add(new BackgroundProcessLimitPreferenceController(context));

        // background check

        controllers.add(new AppsNotRespondingPreferenceController(context));

        controllers.add(new NotificationChannelWarningsPreferenceController(context));

/*

 * 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.development;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.verify;

import static org.mockito.Mockito.when;

import android.app.IActivityManager;

import android.content.Context;

import android.os.RemoteException;

import android.support.v7.preference.ListPreference;

import android.support.v7.preference.PreferenceScreen;

import com.android.settings.R;

import com.android.settings.TestConfig;

import com.android.settings.testutils.SettingsRobolectricTestRunner;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

import org.robolectric.RuntimeEnvironment;

import org.robolectric.annotation.Config;

@RunWith(SettingsRobolectricTestRunner.class)

@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)

public class BackgroundProcessLimitPreferenceControllerTest {

    @Mock

    private IActivityManager mActivityManager;

    @Mock

    private ListPreference mPreference;

    @Mock

    private PreferenceScreen mScreen;

    /**

     * 0: Standard limit

     * 1: No Background processes

     * 2: At most 1 process

     * 3: At most 2 processes

     * 4: At most 3 processes

     * 5: At most 4 processes

     */

    private String[] mListValues;

    private String[] mListSummaries;

    private Context mContext;

    private BackgroundProcessLimitPreferenceController mController;

    @Before

    public void setup() {

        MockitoAnnotations.initMocks(this);

        mContext = RuntimeEnvironment.application;

        mListValues = mContext.getResources().getStringArray(R.array.app_process_limit_values);

        mListSummaries = mContext.getResources().getStringArray(R.array.app_process_limit_entries);

        mController = spy(new BackgroundProcessLimitPreferenceController(mContext));

        doReturn(mActivityManager).when(mController).getActivityManagerService();

        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(mPreference);

        mController.displayPreference(mScreen);

    }

    @Test

    public void onPreferenceChange_noBackgroundProcessSet_shouldSetToNoBackgroundProcess()

            throws RemoteException {

        mController.onPreferenceChange(mPreference, mListValues[1]);

        verify(mActivityManager).setProcessLimit(Integer.valueOf(mListValues[1]));

    }

    @Test

    public void onPreferenceChange_1ProcessSet_shouldSetTo1BackgroundProcess()

            throws RemoteException {

        mController.onPreferenceChange(mPreference, mListValues[2]);

        verify(mActivityManager).setProcessLimit(Integer.valueOf(mListValues[2]));

    }

    @Test

    public void updateState_noBackgroundProcessSet_shouldSetPreferenceToNoBackgroundProcess()

            throws RemoteException {

        when(mActivityManager.getProcessLimit()).thenReturn(Integer.valueOf(mListValues[1]));

        mController.updateState(mPreference);

        verify(mPreference).setValue(mListValues[1]);

        verify(mPreference).setSummary(mListSummaries[1]);

    }

    @Test

    public void updateState_1ProcessSet_shouldSetPreference1BackgroundProcess()

            throws RemoteException {

        when(mActivityManager.getProcessLimit()).thenReturn(Integer.valueOf(mListValues[2]));

        mController.updateState(mPreference);

        verify(mPreference).setValue(mListValues[2]);

        verify(mPreference).setSummary(mListSummaries[2]);

    }

    @Test

    public void updateState_veryHighLimit_shouldDefaultToStandardLimit() throws RemoteException {

        when(mActivityManager.getProcessLimit()).thenReturn(Integer.MAX_VALUE);

        mController.updateState(mPreference);

        verify(mPreference).setValue(mListValues[0]);

        verify(mPreference).setSummary(mListSummaries[0]);

    }

    @Test

    public void onDeveloperOptionsSwitchEnabled_shouldEnablePreference() {

        mController.onDeveloperOptionsSwitchEnabled();

        verify(mPreference).setEnabled(true);

    }

    @Test

    public void onDeveloperOptionsSwitchDisabled_shouldDisableAndResetPreference()

            throws RemoteException {

        mController.onDeveloperOptionsSwitchDisabled();

        verify(mPreference).setEnabled(false);

        verify(mActivityManager).setProcessLimit(-1);

    }

}