ActivityState.java revision 0b2486cff0c1b951c54325596256b986307f7f3a 
1/*
2 * Copyright (C) 2010 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
17package com.android.gallery3d.app;
18
19import android.app.ActionBar;
20import android.app.Activity;
21import android.content.BroadcastReceiver;
22import android.content.Context;
23import android.content.Intent;
24import android.content.IntentFilter;
25import android.content.res.Configuration;
26import android.os.BatteryManager;
27import android.os.Bundle;
28import android.view.Menu;
29import android.view.MenuItem;
30import android.view.View;
31import android.view.Window;
32import android.view.WindowManager;
33
34import com.android.gallery3d.ui.GLView;
35
36abstract public class ActivityState {
37    protected static final int FLAG_HIDE_ACTION_BAR = 1;
38    protected static final int FLAG_HIDE_STATUS_BAR = 2;
39    protected static final int FLAG_SCREEN_ON = 4;
40
41    private static final int SCREEN_ON_FLAGS = (
42              WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
43            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
44            | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
45        );
46
47    protected GalleryActivity mActivity;
48    protected Bundle mData;
49    protected int mFlags;
50
51    protected ResultEntry mReceivedResults;
52    protected ResultEntry mResult;
53
54    protected static class ResultEntry {
55        public int requestCode;
56        public int resultCode = Activity.RESULT_CANCELED;
57        public Intent resultData;
58    }
59
60    private boolean mDestroyed = false;
61    private boolean mPlugged = false;
62    boolean mIsFinishing = false;
63
64    protected ActivityState() {
65    }
66
67    protected void setContentPane(GLView content) {
68        mActivity.getGLRoot().setContentPane(content);
69    }
70
71    void initialize(GalleryActivity activity, Bundle data) {
72        mActivity = activity;
73        mData = data;
74    }
75
76    public Bundle getData() {
77        return mData;
78    }
79
80    protected void onBackPressed() {
81        mActivity.getStateManager().finishState(this);
82    }
83
84    protected void setStateResult(int resultCode, Intent data) {
85        if (mResult == null) return;
86        mResult.resultCode = resultCode;
87        mResult.resultData = data;
88    }
89
90    protected void onConfigurationChanged(Configuration config) {
91    }
92
93    protected void onSaveState(Bundle outState) {
94    }
95
96    protected void onStateResult(int requestCode, int resultCode, Intent data) {
97    }
98
99    protected void onCreate(Bundle data, Bundle storedState) {
100    }
101
102    BroadcastReceiver mPowerIntentReceiver = new BroadcastReceiver() {
103        @Override
104        public void onReceive(Context context, Intent intent) {
105            final String action = intent.getAction();
106            if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
107                boolean plugged = (0 != intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0));
108
109                if (plugged != mPlugged) {
110                    mPlugged = plugged;
111                    setScreenOnFlags();
112                }
113            }
114        }
115    };
116
117    void setScreenOnFlags() {
118        final Window win = ((Activity) mActivity).getWindow();
119        final WindowManager.LayoutParams params = win.getAttributes();
120        if (mPlugged && 0 != (mFlags & FLAG_SCREEN_ON)) {
121            params.flags |= SCREEN_ON_FLAGS;
122        } else {
123            params.flags &= ~SCREEN_ON_FLAGS;
124        }
125        win.setAttributes(params);
126    }
127
128    protected void onPause() {
129        if (0 != (mFlags & FLAG_SCREEN_ON)) {
130            ((Activity) mActivity).unregisterReceiver(mPowerIntentReceiver);
131        }
132    }
133
134    // should only be called by StateManager
135    void resume() {
136        Activity activity = (Activity) mActivity;
137        ActionBar actionBar = activity.getActionBar();
138        if (actionBar != null) {
139            if ((mFlags & FLAG_HIDE_ACTION_BAR) != 0) {
140                actionBar.hide();
141            } else {
142                actionBar.show();
143            }
144            int stateCount = mActivity.getStateManager().getStateCount();
145            mActivity.getGalleryActionBar().setDisplayOptions(stateCount > 1, true);
146            // Default behavior, this can be overridden in ActivityState's onResume.
147            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
148        }
149
150        activity.invalidateOptionsMenu();
151
152        setScreenOnFlags();
153
154        boolean lightsOut = ((mFlags & FLAG_HIDE_STATUS_BAR) != 0);
155        mActivity.getGLRoot().setLightsOutMode(lightsOut);
156
157        ResultEntry entry = mReceivedResults;
158        if (entry != null) {
159            mReceivedResults = null;
160            onStateResult(entry.requestCode, entry.resultCode, entry.resultData);
161        }
162
163        if (0 != (mFlags & FLAG_SCREEN_ON)) {
164            // we need to know whether the device is plugged in to do this correctly
165            final IntentFilter filter = new IntentFilter();
166            filter.addAction(Intent.ACTION_BATTERY_CHANGED);
167            activity.registerReceiver(mPowerIntentReceiver, filter);
168        }
169        onResume();
170
171        // the transition store should be cleared after resume;
172        mActivity.getTransitionStore().clear();
173    }
174
175    // a subclass of ActivityState should override the method to resume itself
176    protected void onResume() {
177    }
178
179    protected boolean onCreateActionBar(Menu menu) {
180        // TODO: we should return false if there is no menu to show
181        //       this is a workaround for a bug in system
182        return true;
183    }
184
185    protected boolean onItemSelected(MenuItem item) {
186        return false;
187    }
188
189    protected void onDestroy() {
190        mDestroyed = true;
191    }
192
193    boolean isDestroyed() {
194        return mDestroyed;
195    }
196
197    public boolean isFinishing() {
198        return mIsFinishing;
199    }
200}
201