android7.1的SnapdragonCamera之CameraActivity逻辑流程分析整体

不积跬步无以至千里
“一花一世界，一树一乾坤，一草一天堂，一木一浮生”,这句话告诉我们通过一小部分可以知道整个整体，同样的Camera也一样，本文主要分析这个CameraActivity。
其实我发现AndroidMainfest.xml中，启动Activity就是CameraActivity的别名的CameraLauncher，如下图：

下面看一下这个CameraActivity的整个生命周期（代码的逻辑，我通过加注释给大家解释一下）。

onCreate方法

    public void onCreate(Bundle state) {super.onCreate(state);//检查权限,如果权限没检查过，或者没有批准的权限直接关闭。另说一嘴，大家都知道吗？android7.1又对权限做了新的处理。if (checkPermissions() || !mHasCriticalPermissions) {Log.v(TAG, "onCreate: Missing critical permissions.");//关闭本Activity，即跳出整个程序finish();return;}// Check if this is in the secure camera mode.检查是否为安全相机模式Intent intent = getIntent();String action = intent.getAction();if (INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE.equals(action)|| ACTION_IMAGE_CAPTURE_SECURE.equals(action)|| intent.getComponent().getClassName().equals(GESTURE_CAMERA_NAME)) {mSecureCamera = true;} else {mSecureCamera = intent.getBooleanExtra(SECURE_CAMERA_EXTRA, false);}//根据相机是不是安全相机模式做处理if (mSecureCamera) {// Change the window flags so that secure camera can show when locked 当被锁住时，为安全模式时，改变窗口。Window win = getWindow();WindowManager.LayoutParams params = win.getAttributes();params.flags |= WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;if (intent.getComponent().getClassName().equals(GESTURE_CAMERA_NAME)) {params.flags |= WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON;//获取唤醒锁PowerManager pm = ((PowerManager) getSystemService(POWER_SERVICE));mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);mWakeLock.acquire();Log.d(TAG, "acquire wake lock");}win.setAttributes(params);}GcamHelper.init(getContentResolver());//设置actionBargetWindow().requestFeature(Window.FEATURE_ACTION_BAR);setContentView(R.layout.camera_filmstrip);//为ActionBa设置菜单可见监听mActionBar = getActionBar();mActionBar.addOnMenuVisibilityListener(this);//当大于4.3版本，设置窗口的旋转动画if (ApiHelper.HAS_ROTATION_ANIMATION) {setRotationAnimation();}//声明一个主线程的Handler,主要用于ActionBar的隐藏和显示mMainHandler = new MainHandler(getMainLooper());//关联控件mAboveFilmstripControlLayout =(FrameLayout) findViewById(R.id.camera_above_filmstrip_layout);mAboveFilmstripControlLayout。setFitsSystemWindows(true);
mAboveFilmstripControlLayout。setFitsSystemWindows(true);
this.setSystemBarsVisibility(false);mPanoramaManager = AppManagerFactory.getInstance(this)。getPanoramaStitchingManager();mPlaceholderManager = AppManagerFactory.getInstance(this)。getGcamProcessingManager();//添加图片加载监听mPanoramaManager。addTaskListener(mStitchingListener);mPlaceholderManager。addTaskListener(mPlaceholderListener);LayoutInflater inflater = getLayoutInflater();View rootLayout = inflater。inflate(R。layout。camera, null, false);mCameraRootFrame = (FrameLayout)rootLayout。findViewById(R。id。camera_root_frame);mCameraPhotoModuleRootView = rootLayout。findViewById(R。id。camera_photo_root);mCameraVideoModuleRootView = rootLayout。findViewById(R。id。camera_video_root);mCameraPanoModuleRootView = rootLayout。findViewById(R。id。camera_pano_root);mPanoStitchingPanel = findViewById(R。id。pano_stitching_progress_panel);mBottomProgress = (ProgressBar) findViewById(R。id。pano_stitching_progress_bar);mCameraPreviewData = new CameraPreviewData(rootLayout,FilmStripView。ImageData。SIZE_FULL,FilmStripView。ImageData。SIZE_FULL);// Put a CameraPreviewData at the first positionmWrappedDataAdapter = new FixedFirstDataAdapter(new CameraDataAdapter(new ColorDrawable(getResources()。getColor(R。color.photo_placeholder))),mCameraPreviewData);mFilmStripView = (FilmStripView) findViewById(R。id.filmstrip_view);mFilmStripView。setViewGap(getResources()。getDimensionPixelSize(R。dimen.camera_film_strip_gap));mPanoramaViewHelper = new PanoramaViewHelper(this);mPanoramaViewHelper。onCreate();mFilmStripView。setPanoramaViewHelper(mPanoramaViewHelper);// Set up the camera preview first so the preview shows up ASAPmFilmStripView。setListener(mFilmStripListener);//获取当前的拍照模式：视频、照相int moduleIndex = -1;if (MediaStore。INTENT_ACTION_VIDEO_CAMERA。equals(getIntent()。getAction())|| MediaStore。ACTION_VIDEO_CAPTURE。equals(getIntent()。getAction())) {moduleIndex = ModuleSwitcher。VIDEO_MODULE_INDEX;} else if (MediaStore。INTENT_ACTION_STILL_IMAGE_CAMERA.equals(getIntent()。getAction())|| MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE。equals(getIntent()。getAction())) {moduleIndex = ModuleSwitcher。PHOTO_MODULE_INDEX;SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);if (prefs.getInt(CameraSettings.KEY_STARTUP_MODULE_INDEX, -1)== ModuleSwitcher.GCAM_MODULE_INDEX && GcamHelper.hasGcamCapture()) {moduleIndex = ModuleSwitcher.GCAM_MODULE_INDEX;}} else if (MediaStore.ACTION_IMAGE_CAPTURE.equals(getIntent().getAction())|| MediaStore.ACTION_IMAGE_CAPTURE_SECURE.equals(getIntent().getAction())) {moduleIndex = ModuleSwitcher.PHOTO_MODULE_INDEX;} else {// If the activity has not been started using an explicit intent,// read the module index from the last time the user changed modesSharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);moduleIndex = prefs.getInt(CameraSettings.KEY_STARTUP_MODULE_INDEX, -1);if ((moduleIndex == ModuleSwitcher.GCAM_MODULE_INDEX &&!GcamHelper.hasGcamCapture()) || moduleIndex < 0) {moduleIndex = ModuleSwitcher.PHOTO_MODULE_INDEX;}}//设置重力感应监听mOrientationListener = new MyOrientationEventListener(this);//根据上面获取、判断的模式，去设置界面的显示等等。setModuleFromIndex(moduleIndex);//根据是不是安全相机来处理
if (!mSecureCamera) {mDataAdapter = mWrappedDataAdapter;mFilmStripView。setDataAdapter(mDataAdapter);if (!isCaptureIntent()) {mDataAdapter。requestLoad(getContentResolver());mDataRequested = true;}} else {// Put a lock placeholder as the last image by setting its date to// 0.//点击照片跳转意图ImageView v = (ImageView) getLayoutInflater().inflate(R.layout.secure_album_placeholder, null);v.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {try {UsageStatistics.onEvent(UsageStatistics.COMPONENT_CAMERA,UsageStatistics.ACTION_GALLERY, null);//跳转到相册        startActivity(IntentHelper.getGalleryIntent(CameraActivity.this));} catch (ActivityNotFoundException e) {Log.w(TAG, "Failed to launch gallery activity, closing");}finish();}});mDataAdapter = new FixedLastDataAdapter(mWrappedDataAdapter,new SimpleViewData(v,v.getDrawable().getIntrinsicWidth(),v.getDrawable().getIntrinsicHeight(),0, 0));// Flush out all the original data.mDataAdapter.flush();mFilmStripView.setDataAdapter(mDataAdapter);}//设置nfcsetupNfcBeamPush();//设置观察者，来分别观察图片的变化和视频资源的变化mLocalImagesObserver = new LocalMediaObserver();mLocalVideosObserver = new LocalMediaObserver();getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true,mLocalImagesObserver);getContentResolver().registerContentObserver(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, true,mLocalVideosObserver);SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);mDeveloperMenuEnabled = prefs.getBoolean(CameraSettings.KEY_DEVELOPER_MENU, false);//设置窗口大小Display display = getWindowManager().getDefaultDisplay();Point size = new Point();display.getSize(size);int width = size.x;int height = size.y;int lower = Math.min(width, height);int offset = lower * 10 / 100;SETTING_LIST_WIDTH_1 = lower / 2 + offset;SETTING_LIST_WIDTH_2 = lower / 2 - offset;//注册关于sd的挂载的广播registerSDcardMountedReceiver();}

onStart方法：

@Overridepublic void onStart() {super.onStart();//开启添加图片、视频的servicebindMediaSaveService();mPanoramaViewHelper.onStart();}

onResume方法：

@Overridepublic void onResume() {//权限检测if (checkPermissions() || !mHasCriticalPermissions) {super。onResume();Log.v(TAG, "onResume: Missing critical permissions.");finish();return;}UsageStatistics.onEvent(UsageStatistics.COMPONENT_CAMERA,UsageStatistics.ACTION_FOREGROUNDED, this.getClass().getSimpleName());mOrientationListener.enable();mCurrentModule.onResumeBeforeSuper();super.onResume();mCurrentModule.onResumeAfterSuper();//设置预览画面能否滑动setSwipingEnabled(true);if (mResetToPreviewOnResume) {// Go to the preview on resume.mFilmStripView.getController().goToFirstItem();}// Default is showing the preview, unless disabled by explicitly// starting an activity we want to return from to the filmstrip rather// than the preview.mResetToPreviewOnResume = true;//查看图片和视频资源有无变化，有则重新加载if (mLocalVideosObserver.isMediaDataChangedDuringPause()|| mLocalImagesObserver.isMediaDataChangedDuringPause()) {if (!mSecureCamera) {// If it's secure camera, requestLoad() should not be called// as it will load all the data.mDataAdapter.requestLoad(getContentResolver());mThumbnailDrawable = null;}}//重置观察者标志位mLocalImagesObserver.setActivityPaused(false);mLocalVideosObserver.setActivityPaused(false);//This is a temporal solution to share LED resource//as Android doesn’t have any default intent to share the state.// if the led flash light is open, turn it offLog.d(TAG, "send the turn off Flashlight broadcast");//关闭闪光灯Intent intent = new Intent("org.codeaurora.snapcam.action.CLOSE_FLASHLIGHT");intent.putExtra("camera_led", true);sendBroadcast(intent);}

onPause方法：

    @Overridepublic void onPause() {// Delete photos that are pending deletion//删除照片时正好界面pause了的处理performDeletion();//关闭重力传感器监听mOrientationListener.disable();mCurrentModule.onPauseBeforeSuper();super.onPause();mCurrentModule.onPauseAfterSuper();//设置观察者的标志位mLocalImagesObserver.setActivityPaused(true);mLocalVideosObserver.setActivityPaused(true);}

onStop方法：

    @Overrideprotected void onStop() {super.onStop();mPanoramaViewHelper.onStop();//断开存储视频、图片的serviceunbindMediaSaveService();}

onDestory方法：

@Overridepublic void onDestroy() {//释放唤醒锁if (mWakeLock != null && mWakeLock.isHeld()) {mWakeLock.release();Log.d(TAG, "wake lock release");}//注销观察者和sd卡的挂载广播if (mLocalImagesObserver != null) {getContentResolver().unregisterContentObserver(mLocalImagesObserver);getContentResolver().unregisterContentObserver(mLocalVideosObserver);unregisterReceiver(mSDcardMountedReceiver);}super.onDestroy();}

先分析到这，接下在再补充。。。

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