Android -- Camera源码简析，启动流程

部检测

startFaceDetection();

// Show the tap to focus toast if this is the first start.

// 假如是第一次启动，提示用户“触摸对焦”

if (mFocusAreaSupported

mPreferences.getBoolean(CameraSettings.KEY_CAMERA_FIRST_USE_HINT_SHOWN, true)) {

// Delay the toast for one second to wait for orientation.

mHandler.sendEmptyMessageDelayed(SHOW_TAP_TO_FOCUS_TOAST, 1000);

}

mFirstTimeInitialized = true;

addIdleHandler();

}

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如果不是，则执行initializeSecondTime();

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/**

* // If the activity is paused and resumed, this method will be called in

* // onResume.

*/

private void initializeSecondTime() {

// Start orientation listener as soon as possible because it takes

// some time to get first orientation.

//方向翻转设置enable，其中包括翻转的时候的动画

mOrientationListener.enable();

// Start location update if needed.

boolean recordLocation = RecordLocationPreference.get(

mPreferences, getContentResolver());

mLocationManager.recordLocation(recordLocation);

//设置SD卡广播

installIntentFilter();

mImageSaver = new ImageSaver();

//初始化Zoom

initializeZoom();

//mMediaProviderClient=媒体Provider对象

keepMediaProviderInstance();

//检查硬盘

checkStorage();

//淡出retake和done的Button

hidePostCaptureAlert();

if (!mIsImageCaptureIntent) {

//如果不是第三方开启，则更新缩略图

updateThumbnailButton();

mModePicker.setCurrentMode(ModePicker.MODE_CAMERA);

}

}

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4、surfaceDestroyed

stopPreview();

mSurfaceHolder = null;