android图片浏览源码

/* * Copyright (C) 2007 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.camera; import com.android.gallery.R; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; import android.provider.MediaStore; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.view.View.OnTouchListener; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.Toast; import android.widget.ZoomButtonsController; import com.android.camera.gallery.IImage; import com.android.camera.gallery.IImageList; import com.android.camera.gallery.VideoObject; import java.util.Random; // This activity can display a whole picture and navigate them in a specific // gallery. It has two modes: normal mode and slide show mode. In normal mode // the user view one image at a time, and can click "previous" and "next" // button to see the previous or next image. In slide show mode it shows one // image after another, with some transition effect. public class ViewImage extends NoSearchActivity implements View.OnClickListener { private static final String PREF_SLIDESHOW_REPEAT = "pref_gallery_slideshow_repeat_key"; private static final String PREF_SHUFFLE_SLIDESHOW = "pref_gallery_slideshow_shuffle_key"; private static final String STATE_URI = "uri"; private static final String STATE_SLIDESHOW = "slideshow"; private static final String EXTRA_SLIDESHOW = "slideshow"; private static final String TAG = "ViewImage"; private ImageGetter mGetter; private Uri mSavedUri; boolean mPaused = true; private boolean mShowControls = true; // Choices for what adjacents to load. private static final int[] sOrderAdjacents = new int[] {0, 1, -1}; private static final int[] sOrderSlideshow = new int[] {0}; final GetterHandler mHandler = new GetterHandler(); private final Random mRandom = new Random(System.currentTimeMillis()); private int [] mShuffleOrder = null; private boolean mUseShuffleOrder = false; private boolean mSlideShowLoop = false; static final int MODE_NORMAL = 1; static final int MODE_SLIDESHOW = 2; private int mMode = MODE_NORMAL; private boolean mFullScreenInNormalMode; private boolean mShowActionIcons; private View mActionIconPanel; private int mSlideShowInterval; private int mLastSlideShowImage; int mCurrentPosition = 0; // represents which style animation to use private int mAnimationIndex; private Animation [] mSlideShowInAnimation; private Animation [] mSlideShowOutAnimation; private SharedPreferences mPrefs; private View mNextImageView; private View mPrevImageView; private final Animation mHideNextImageViewAnimation = new AlphaAnimation(1F, 0F); private final Animation mHidePrevImageViewAnimation = new AlphaAnimation(1F, 0F); private final Animation mShowNextImageViewAnimation = new AlphaAnimation(0F, 1F); private final Animation mShowPrevImageViewAnimation = new AlphaAnimation(0F, 1F); public static final String KEY_IMAGE_LIST = "image_list"; private static final String STATE_SHOW_CONTROLS = "show_controls"; IImageList mAllImages; private ImageManager.ImageListParam mParam; private int mSlideShowImageCurrent = 0; private final ImageViewTouchBase [] mSlideShowImageViews = new ImageViewTouchBase[2]; GestureDetector mGestureDetector; private ZoomButtonsController mZoomButtonsController; // The image view displayed for normal mode. private ImageViewTouch mImageView; // This is the cache for thumbnail bitmaps. private BitmapCache mCache; private MenuHelper.MenuItemsResult mImageMenuRunnable; private final Runnable mDismissOnScreenControlRunner = new Runnable() { public void run() { hideOnScreenControls(); } }; private void updateNextPrevControls() { boolean showPrev = mCurrentPosition > 0; boolean showNext = mCurrentPosition < mAllImages.getCount() - 1; boolean prevIsVisible = mPrevImageView.getVisibility() == View.VISIBLE; boolean nextIsVisible = mNextImageView.getVisibility() == View.VISIBLE; if (showPrev && !prevIsVisible) { Animation a = mShowPrevImageViewAnimation; a.setDuration(500); mPrevImageView.startAnimation(a); mPrevImageView.setVisibility(View.VISIBLE); } else if (!showPrev && prevIsVisible) { Animation a = mHidePrevImageViewAnimation; a.setDuration(500); mPrevImageView.startAnimation(a); mPrevImageView.setVisibility(View.GONE); } if (showNext && !nextIsVisible) { Animation a = mShowNextImageViewAnimation; a.setDuration(500); mNextImageView.startAnimation(a); mNextImageView.setVisibility(View.VISIBLE); } else if (!showNext && nextIsVisible) { Animation a = mHideNextImageViewAnimation; a.setDuration(500); mNextImageView.startAnimation(a); mNextImageView.setVisibility(View.GONE); } } private void hideOnScreenControls() { if (mShowActionIcons && mActionIconPanel.getVisibility() == View.VISIBLE) { Animation animation = new AlphaAnimation(1, 0); animation.setDuration(500); mActionIconPanel.startAnimation(animation); mActionIconPanel.setVisibility(View.INVISIBLE); } if (mNextImageView.getVisibility() == View.VISIBLE) { Animation a = mHideNextImageViewAnimation; a.setDuration(500); mNextImageView.startAnimation(a); mNextImageView.setVisibility(View.INVISIBLE); } if (mPrevImageView.getVisibility() == View.VISIBLE) { Animation a = mHidePrevImageViewAnimation; a.setDuration(500); mPrevImageView.startAnimation(a); mPrevImageView.setVisibility(View.INVISIBLE); } mZoomButtonsController.setVisible(false); } private void showOnScreenControls() { if (mPaused) return; // If the view has not been attached to the window yet, the // zoomButtonControls will not able to show up. So delay it until the // view has attached to window. if (mActionIconPanel.getWindowToken() == null) { mHandler.postGetterCallback(new Runnable() { public void run() { showOnScreenControls(); } }); return; } updateNextPrevControl