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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.tv.settings;
     18 
     19 import com.android.tv.settings.dialog.old.Action;
     20 import com.android.tv.settings.dialog.old.ActionAdapter;
     21 import com.android.tv.settings.dialog.old.ActionFragment;
     22 import com.android.tv.settings.dialog.old.ContentFragment;
     23 import com.android.tv.settings.dialog.old.DialogActivity;
     24 
     25 import android.app.Fragment;
     26 import android.content.res.Resources;
     27 import android.net.Uri;
     28 import android.os.Bundle;
     29 import android.view.KeyEvent;
     30 
     31 import java.util.ArrayList;
     32 import java.util.Stack;
     33 
     34 public abstract class BaseSettingsActivity extends DialogActivity {
     35 
     36     protected Object mState;
     37     protected Stack<Object> mStateStack = new Stack<Object>();
     38     protected Resources mResources;
     39     protected Fragment mContentFragment;
     40     protected Fragment mActionFragment;
     41     protected ArrayList<Action> mActions;
     42 
     43     /**
     44      * This method initializes the parameter and sets the initial state. <br/>
     45      * Activities extending {@link BaseSettingsActivity} should initialize their
     46      * own local variables, if any, before calling {@link #onCreate}
     47      */
     48     @Override
     49     protected void onCreate(Bundle savedInstanceState) {
     50         mResources = getResources();
     51         mActions = new ArrayList<Action>();
     52         super.onCreate(savedInstanceState);
     53 
     54         setState(getInitialState(), true);
     55     }
     56 
     57     protected abstract Object getInitialState();
     58 
     59     protected void setState(Object state, boolean updateStateStack) {
     60         if (updateStateStack && mState != null) {
     61             mStateStack.push(mState);
     62         }
     63         mState = state;
     64 
     65         updateView();
     66     }
     67 
     68     protected void setView(int titleResId, int breadcrumbResId, int descResId, int iconResId) {
     69         String title = titleResId != 0 ? mResources.getString(titleResId) : null;
     70         String breadcrumb = breadcrumbResId != 0 ? mResources.getString(breadcrumbResId) : null;
     71         String description = descResId != 0 ? mResources.getString(descResId) : null;
     72         setView(title, breadcrumb, description, iconResId);
     73     }
     74 
     75     protected void setView(String title, String breadcrumb, String description, int iconResId) {
     76         mContentFragment = ContentFragment.newInstance(title, breadcrumb, description, iconResId,
     77                 getResources().getColor(R.color.icon_background));
     78         mActionFragment = ActionFragment.newInstance(mActions);
     79         setContentAndActionFragments(mContentFragment, mActionFragment);
     80     }
     81 
     82     /**
     83      * Set the view.
     84      *
     85      * @param uri Uri of icon resource.
     86      */
     87     protected void setView(String title, String breadcrumb, String description, Uri uri) {
     88         mContentFragment = ContentFragment.newInstance(title, breadcrumb, null, uri,
     89                 getResources().getColor(R.color.icon_background));
     90         mActionFragment = ActionFragment.newInstance(mActions);
     91         setContentAndActionFragments(mContentFragment, mActionFragment);
     92     }
     93 
     94     protected void setView(int titleResId, String breadcrumb, int descResId, Uri uri) {
     95         String title = titleResId != 0 ? mResources.getString(titleResId) : null;
     96         String description = descResId != 0 ? mResources.getString(descResId) : null;
     97         setView(title, breadcrumb, description, uri);
     98     }
     99 
    100     /**
    101      * This method is called by {@link #setState}, and updates the layout based
    102      * on the current state
    103      */
    104     protected abstract void updateView();
    105 
    106     /**
    107      * This method is called to update the contents of mActions to reflect the
    108      * list of actions for the current state.
    109      */
    110     protected abstract void refreshActionList();
    111 
    112     /**
    113      * This method is used to set boolean properties
    114      *
    115      * @param enable whether or not to enable the property
    116      */
    117     protected abstract void setProperty(boolean enable);
    118 
    119     @Override
    120     public boolean onKeyDown(int keyCode, KeyEvent event) {
    121         if (keyCode == KeyEvent.KEYCODE_BACK) {
    122             goBack();
    123             return true;
    124         }
    125         return super.onKeyDown(keyCode, event);
    126     }
    127 
    128     protected void goBack(){
    129         if (mState.equals(getInitialState())) {
    130             finish();
    131         } else if (getPrevState() != null) {
    132             mState = mStateStack.pop();
    133             // Using the synchronous version of popBackStack so that we can get
    134             // the updated
    135             // instance of the action Fragment on the following line.
    136             getFragmentManager().popBackStackImmediate();
    137             mActionFragment = getActionFragment();
    138             // Update Current State Actions
    139             if ((mActionFragment != null) && (mActionFragment instanceof ActionFragment)) {
    140                 ActionFragment actFrag = (ActionFragment) mActionFragment;
    141                 refreshActionList();
    142                 ((ActionAdapter) actFrag.getAdapter()).setActions(mActions);
    143             }
    144         }
    145     }
    146 
    147     protected Object getPrevState() {
    148         return mStateStack.isEmpty() ? null : mStateStack.peek();
    149     }
    150 }
    151