| /* |
| * Copyright (C) 2010 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.gallery3d.app; |
| |
| import com.android.gallery3d.common.Utils; |
| |
| import android.app.Activity; |
| import android.content.Intent; |
| import android.os.Bundle; |
| import android.os.Parcelable; |
| import android.view.Menu; |
| import android.view.MenuItem; |
| |
| import java.util.Stack; |
| |
| public class StateManager { |
| @SuppressWarnings("unused") |
| private static final String TAG = "StateManager"; |
| private boolean mIsResumed = false; |
| |
| private static final String KEY_MAIN = "activity-state"; |
| private static final String KEY_DATA = "data"; |
| private static final String KEY_STATE = "bundle"; |
| private static final String KEY_CLASS = "class"; |
| |
| private GalleryActivity mContext; |
| private Stack<StateEntry> mStack = new Stack<StateEntry>(); |
| private ActivityState.ResultEntry mResult; |
| |
| public StateManager(GalleryActivity context) { |
| mContext = context; |
| } |
| |
| public void startState(Class<? extends ActivityState> klass, |
| Bundle data) { |
| Log.v(TAG, "startState " + klass); |
| ActivityState state = null; |
| try { |
| state = klass.newInstance(); |
| } catch (Exception e) { |
| throw new AssertionError(e); |
| } |
| if (!mStack.isEmpty()) { |
| ActivityState top = getTopState(); |
| if (mIsResumed) top.onPause(); |
| } |
| state.initialize(mContext, data); |
| |
| mStack.push(new StateEntry(data, state)); |
| state.onCreate(data, null); |
| if (mIsResumed) state.resume(); |
| } |
| |
| public void startStateForResult(Class<? extends ActivityState> klass, |
| int requestCode, Bundle data) { |
| Log.v(TAG, "startStateForResult " + klass + ", " + requestCode); |
| ActivityState state = null; |
| try { |
| state = klass.newInstance(); |
| } catch (Exception e) { |
| throw new AssertionError(e); |
| } |
| state.initialize(mContext, data); |
| state.mResult = new ActivityState.ResultEntry(); |
| state.mResult.requestCode = requestCode; |
| |
| if (!mStack.isEmpty()) { |
| ActivityState as = getTopState(); |
| as.mReceivedResults = state.mResult; |
| if (mIsResumed) as.onPause(); |
| } else { |
| mResult = state.mResult; |
| } |
| |
| mStack.push(new StateEntry(data, state)); |
| state.onCreate(data, null); |
| if (mIsResumed) state.resume(); |
| } |
| |
| public boolean createOptionsMenu(Menu menu) { |
| if (!mStack.isEmpty()) { |
| ((Activity) mContext).setProgressBarIndeterminateVisibility(false); |
| return getTopState().onCreateActionBar(menu); |
| } else { |
| return false; |
| } |
| } |
| |
| public void resume() { |
| if (mIsResumed) return; |
| mIsResumed = true; |
| if (!mStack.isEmpty()) getTopState().resume(); |
| } |
| |
| public void pause() { |
| if (!mIsResumed) return; |
| mIsResumed = false; |
| if (!mStack.isEmpty()) getTopState().onPause(); |
| } |
| |
| public void notifyActivityResult(int requestCode, int resultCode, Intent data) { |
| getTopState().onStateResult(requestCode, resultCode, data); |
| } |
| |
| public int getStateCount() { |
| return mStack.size(); |
| } |
| |
| public boolean itemSelected(MenuItem item) { |
| if (!mStack.isEmpty()) { |
| if (mStack.size() > 1 && item.getItemId() == android.R.id.home) { |
| getTopState().onBackPressed(); |
| return true; |
| } else { |
| return getTopState().onItemSelected(item); |
| } |
| } |
| return false; |
| } |
| |
| public void onBackPressed() { |
| if (!mStack.isEmpty()) { |
| getTopState().onBackPressed(); |
| } |
| } |
| |
| void finishState(ActivityState state) { |
| Log.v(TAG, "finishState " + state.getClass()); |
| if (state != mStack.peek().activityState) { |
| throw new IllegalArgumentException("The stateview to be finished" |
| + " is not at the top of the stack: " + state + ", " |
| + mStack.peek().activityState); |
| } |
| |
| // Remove the top state. |
| mStack.pop(); |
| if (mIsResumed) state.onPause(); |
| mContext.getGLRoot().setContentPane(null); |
| state.onDestroy(); |
| |
| if (mStack.isEmpty()) { |
| Log.v(TAG, "no more state, finish activity"); |
| Activity activity = (Activity) mContext.getAndroidContext(); |
| if (mResult != null) { |
| activity.setResult(mResult.resultCode, mResult.resultData); |
| } |
| activity.finish(); |
| |
| // The finish() request is rejected (only happens under Monkey), |
| // so we start the default page instead. |
| if (!activity.isFinishing()) { |
| Log.v(TAG, "finish() failed, start default page"); |
| ((Gallery) mContext).startDefaultPage(); |
| } |
| } else { |
| // Restore the immediately previous state |
| ActivityState top = mStack.peek().activityState; |
| if (mIsResumed) top.resume(); |
| } |
| } |
| |
| void switchState(ActivityState oldState, |
| Class<? extends ActivityState> klass, Bundle data) { |
| Log.v(TAG, "switchState " + oldState + ", " + klass); |
| if (oldState != mStack.peek().activityState) { |
| throw new IllegalArgumentException("The stateview to be finished" |
| + " is not at the top of the stack: " + oldState + ", " |
| + mStack.peek().activityState); |
| } |
| // Remove the top state. |
| mStack.pop(); |
| if (mIsResumed) oldState.onPause(); |
| oldState.onDestroy(); |
| |
| // Create new state. |
| ActivityState state = null; |
| try { |
| state = klass.newInstance(); |
| } catch (Exception e) { |
| throw new AssertionError(e); |
| } |
| state.initialize(mContext, data); |
| mStack.push(new StateEntry(data, state)); |
| state.onCreate(data, null); |
| if (mIsResumed) state.resume(); |
| } |
| |
| public void destroy() { |
| Log.v(TAG, "destroy"); |
| while (!mStack.isEmpty()) { |
| mStack.pop().activityState.onDestroy(); |
| } |
| mStack.clear(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public void restoreFromState(Bundle inState) { |
| Log.v(TAG, "restoreFromState"); |
| Parcelable list[] = inState.getParcelableArray(KEY_MAIN); |
| |
| for (Parcelable parcelable : list) { |
| Bundle bundle = (Bundle) parcelable; |
| Class<? extends ActivityState> klass = |
| (Class<? extends ActivityState>) bundle.getSerializable(KEY_CLASS); |
| |
| Bundle data = bundle.getBundle(KEY_DATA); |
| Bundle state = bundle.getBundle(KEY_STATE); |
| |
| ActivityState activityState; |
| try { |
| Log.v(TAG, "restoreFromState " + klass); |
| activityState = klass.newInstance(); |
| } catch (Exception e) { |
| throw new AssertionError(e); |
| } |
| activityState.initialize(mContext, data); |
| activityState.onCreate(data, state); |
| mStack.push(new StateEntry(data, activityState)); |
| } |
| } |
| |
| public void saveState(Bundle outState) { |
| Log.v(TAG, "saveState"); |
| Parcelable list[] = new Parcelable[mStack.size()]; |
| |
| int i = 0; |
| for (StateEntry entry : mStack) { |
| Bundle bundle = new Bundle(); |
| bundle.putSerializable(KEY_CLASS, entry.activityState.getClass()); |
| bundle.putBundle(KEY_DATA, entry.data); |
| Bundle state = new Bundle(); |
| entry.activityState.onSaveState(state); |
| bundle.putBundle(KEY_STATE, state); |
| Log.v(TAG, "saveState " + entry.activityState.getClass()); |
| list[i++] = bundle; |
| } |
| outState.putParcelableArray(KEY_MAIN, list); |
| } |
| |
| public boolean hasStateClass(Class<? extends ActivityState> klass) { |
| for (StateEntry entry : mStack) { |
| if (klass.isInstance(entry.activityState)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public ActivityState getTopState() { |
| Utils.assertTrue(!mStack.isEmpty()); |
| return mStack.peek().activityState; |
| } |
| |
| private static class StateEntry { |
| public Bundle data; |
| public ActivityState activityState; |
| |
| public StateEntry(Bundle data, ActivityState state) { |
| this.data = data; |
| this.activityState = state; |
| } |
| } |
| } |