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DeviceOwner / src / com.example.android.deviceowner /

DeviceOwnerFragment.java

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/*
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 * Copyright (C) 2015 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.deviceowner;
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import android.app.Activity;
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import android.app.Fragment;
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import android.app.admin.DevicePolicyManager;
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import android.content.ComponentName;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.SharedPreferences;
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import android.content.pm.ResolveInfo;
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import android.os.Bundle;
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import android.provider.Settings;
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import android.support.annotation.Nullable;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Button;
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import android.widget.CompoundButton;
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import android.widget.SimpleAdapter;
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import android.widget.Spinner;
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import android.widget.Switch;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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/**
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 * Demonstrates the usage of the most common device management APIs for the device owner case.
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 * In addition to various features available for profile owners, device owners can perform extra
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 * actions, such as configuring global settings and enforcing a preferred Activity for a specific
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 * IntentFilter.
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 */
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public class DeviceOwnerFragment extends Fragment {
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    // Keys for SharedPreferences
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    private static final String PREFS_DEVICE_OWNER = "DeviceOwnerFragment";
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    private static final String PREF_LAUNCHER = "launcher";
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    private DevicePolicyManager mDevicePolicyManager;
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    // View references
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    private Switch mSwitchAutoTime;
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    private Switch mSwitchAutoTimeZone;
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    private Spinner mAvailableLaunchers;
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    private Button mButtonLauncher;
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    // Adapter for the spinner to show list of available launchers
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    private LauncherAdapter mAdapter;
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    /**
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     * Handles events on the Switches.
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     */
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    private Switch.OnCheckedChangeListener mOnCheckedChangeListener
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            = new Switch.OnCheckedChangeListener() {
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        @Override
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        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
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            switch (buttonView.getId()) {
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                case R.id.switch_auto_time:
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                    setBooleanGlobalSetting(Settings.Global.AUTO_TIME, isChecked);
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                    retrieveCurrentSettings(getActivity());
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                    break;
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                case R.id.switch_auto_time_zone:
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                    setBooleanGlobalSetting(Settings.Global.AUTO_TIME_ZONE, isChecked);
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                    retrieveCurrentSettings(getActivity());
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                    break;
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            }
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        }
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    };
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    /**
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     * Handles click events on the Button.
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     */
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    private View.OnClickListener mOnClickListener
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            = new View.OnClickListener() {
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        @Override
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        public void onClick(View v) {
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            switch (v.getId()) {
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                case R.id.set_preferred_launcher:
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                    if (loadPersistentPreferredLauncher(getActivity()) == null) {
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                        setPreferredLauncher();
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                    } else {
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                        clearPreferredLauncher();
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                    }
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                    retrieveCurrentSettings(getActivity());
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                    break;
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            }
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        }
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    };
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    /**
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     * @return A newly instantiated {@link DeviceOwnerFragment}.
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     */
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    public static DeviceOwnerFragment newInstance() {
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        return new DeviceOwnerFragment();
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    }
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    @Nullable
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    @Override
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    public View onCreateView(LayoutInflater inflater, ViewGroup container,
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                             Bundle savedInstanceState) {
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        return inflater.inflate(R.layout.fragment_device_owner, container, false);
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    }
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    @Override
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    public void onViewCreated(View view, Bundle savedInstanceState) {
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        // Retain references
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        mSwitchAutoTime = (Switch) view.findViewById(R.id.switch_auto_time);
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        mSwitchAutoTimeZone = (Switch) view.findViewById(R.id.switch_auto_time_zone);
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        mAvailableLaunchers = (Spinner) view.findViewById(R.id.available_launchers);
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        mButtonLauncher = (Button) view.findViewById(R.id.set_preferred_launcher);
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        // Bind event handlers
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        mSwitchAutoTime.setOnCheckedChangeListener(mOnCheckedChangeListener);
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        mSwitchAutoTimeZone.setOnCheckedChangeListener(mOnCheckedChangeListener);
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        mButtonLauncher.setOnClickListener(mOnClickListener);
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    }
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    @Override
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    public void onAttach(Activity activity) {
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        super.onAttach(activity);
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        mDevicePolicyManager =
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                (DevicePolicyManager) activity.getSystemService(Activity.DEVICE_POLICY_SERVICE);
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    }
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    @Override
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    public void onDetach() {
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        mDevicePolicyManager = null;
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        super.onDetach();
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    }
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    @Override
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    public void onResume() {
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        super.onResume();
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        Activity activity = getActivity();
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        if (activity != null) {
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            retrieveCurrentSettings(activity);
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        }
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    }
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    /**
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     * Retrieves the current global settings and changes the UI accordingly.
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     *
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     * @param activity The activity
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     */
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    private void retrieveCurrentSettings(Activity activity) {
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        // Global settings
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        setCheckedSafely(mSwitchAutoTime,
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                getBooleanGlobalSetting(activity.getContentResolver(), Settings.Global.AUTO_TIME));
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        setCheckedSafely(mSwitchAutoTimeZone,
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                getBooleanGlobalSetting(activity.getContentResolver(),
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                        Settings.Global.AUTO_TIME_ZONE));
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        // Launcher
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        Intent intent = new Intent(Intent.ACTION_MAIN);
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        intent.addCategory(Intent.CATEGORY_HOME);
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        List<ResolveInfo> list = activity.getPackageManager()
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                .queryIntentActivities(intent, /* default flags */ 0);
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        mAdapter = new LauncherAdapter(activity, list);
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        mAvailableLaunchers.setAdapter(mAdapter);
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        String packageName = loadPersistentPreferredLauncher(activity);
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        if (packageName == null) { // No preferred launcher is set
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            mAvailableLaunchers.setEnabled(true);
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            mButtonLauncher.setText(R.string.set_as_preferred);
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        } else {
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            int position = -1;
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            for (int i = 0; i < list.size(); ++i) {
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                if (list.get(i).activityInfo.packageName.equals(packageName)) {
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                    position = i;
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                    break;
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                }
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            }
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            if (position != -1) {
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                mAvailableLaunchers.setSelection(position);
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                mAvailableLaunchers.setEnabled(false);
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                mButtonLauncher.setText(R.string.clear_preferred);
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            }
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        }
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    }
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    /**
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     * Retrieves the current boolean value of the specified global setting.
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     *
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     * @param resolver The ContentResolver
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     * @param setting  The setting to be retrieved
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     * @return The current boolean value
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     */
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    private static boolean getBooleanGlobalSetting(ContentResolver resolver, String setting) {
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        return 0 != Settings.Global.getInt(resolver, setting, 0);
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    }
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    /**
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     * Sets the boolean value of the specified global setting.
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     *
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     * @param setting The setting to be set
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     * @param value   The value to be set
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     */
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    private void setBooleanGlobalSetting(String setting, boolean value) {
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        mDevicePolicyManager.setGlobalSetting(
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                // The ComponentName of the device owner
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                DeviceOwnerReceiver.getComponentName(getActivity()),
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                // The settings to be set
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                setting,
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                // The value we write here is a string representation for SQLite
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                value ? "1" : "0");
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    }
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    /**
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     * A utility method to set the checked state of the button without invoking its listener.
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     *
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     * @param button  The button
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     * @param checked The value to be set
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     */
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    private void setCheckedSafely(CompoundButton button, boolean checked) {
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        button.setOnCheckedChangeListener(null);
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        button.setChecked(checked);
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        button.setOnCheckedChangeListener(mOnCheckedChangeListener);
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    }
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    /**
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     * Loads the package name from SharedPreferences.
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     *
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     * @param activity The activity
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     * @return The package name of the launcher currently set as preferred, or null if there is no
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     * preferred launcher.
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     */
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    private static String loadPersistentPreferredLauncher(Activity activity) {
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        return activity.getSharedPreferences(PREFS_DEVICE_OWNER, Context.MODE_PRIVATE)
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                .getString(PREF_LAUNCHER, null);
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    }
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    /**
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     * Saves the package name into SharedPreferences.
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     *
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     * @param activity    The activity
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     * @param packageName The package name to be saved. Pass null to remove the preferred launcher.
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     */
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    private static void savePersistentPreferredLauncher(Activity activity, String packageName) {
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        SharedPreferences.Editor editor = activity.getSharedPreferences(PREFS_DEVICE_OWNER,
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                Context.MODE_PRIVATE).edit();
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        if (packageName == null) {
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            editor.remove(PREF_LAUNCHER);
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        } else {
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            editor.putString(PREF_LAUNCHER, packageName);
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        }
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        editor.apply();
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    }
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    /**
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     * Sets the selected launcher as preferred.
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     */
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    private void setPreferredLauncher() {
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        Activity activity = getActivity();
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        if (activity == null) {
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            return;
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        }
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        IntentFilter filter = new IntentFilter(Intent.ACTION_MAIN);
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        filter.addCategory(Intent.CATEGORY_HOME);
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        filter.addCategory(Intent.CATEGORY_DEFAULT);
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        ComponentName componentName = mAdapter.getComponentName(
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                mAvailableLaunchers.getSelectedItemPosition());
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        mDevicePolicyManager.addPersistentPreferredActivity(
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                DeviceOwnerReceiver.getComponentName(activity), filter, componentName);
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        savePersistentPreferredLauncher(activity, componentName.getPackageName());
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    }
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    /**
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     * Clears the launcher currently set as preferred.
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     */
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    private void clearPreferredLauncher() {
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        Activity activity = getActivity();
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        if (activity == null) {
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            return;
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        }
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        mDevicePolicyManager.clearPackagePersistentPreferredActivities(
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                DeviceOwnerReceiver.getComponentName(activity),
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                loadPersistentPreferredLauncher(activity));
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        savePersistentPreferredLauncher(activity, null);
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    }
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    /**
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     * Shows list of {@link ResolveInfo} in a {@link Spinner}.
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     */
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    private static class LauncherAdapter extends SimpleAdapter {
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        private static final String KEY_PACKAGE_NAME = "package_name";
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        private static final String KEY_ACTIVITY_NAME = "activity_name";
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        public LauncherAdapter(Context context, List<ResolveInfo> list) {
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            super(context, createData(list), android.R.layout.simple_list_item_1,
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                    new String[]{KEY_PACKAGE_NAME},
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                    new int[]{android.R.id.text1});
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        }
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        private static List<HashMap<String, String>> createData(List<ResolveInfo> list) {
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            List<HashMap<String, String>> data = new ArrayList<>();
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            for (ResolveInfo info : list) {
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                HashMap<String, String> map = new HashMap<>();
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                map.put(KEY_PACKAGE_NAME, info.activityInfo.packageName);
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                map.put(KEY_ACTIVITY_NAME, info.activityInfo.name);
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                data.add(map);
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            }
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            return data;
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        }
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