Camera.java
@Override
public void autoFocus() {
//記錄當前聚焦開始時間
mFocusStartTime = System.currentTimeMillis();
//設置Camera的回調聚焦
mCameraDevice.autoFocus(mAutoFocusCallback);
//設置Camera的狀態為Focusing
setCameraState(FOCUSING);
}
private void setCameraState(int state) {
mCameraState = state;
switch (state) {
case SNAPSHOT_IN_PROGRESS:
case FOCUSING:
enableCameraControls(false);
break;
case IDLE:
case PREVIEW_STOPPED:
enableCameraControls(true);
break;
}
}
- enableCameraControls，設置enable，是否可以點擊
/**
* 設置幾個button或者view不可點擊
* @param enable
*/
private void enableCameraControls(boolean enable) {
if (mIndicatorControlContainer != null) {
mIndicatorControlContainer.setEnabled(enable);
}
if (mModePicker != null) mModePicker.setEnabled(enable);
if (mZoomControl != null) mZoomControl.setEnabled(enable);
if (mThumbnailView != null) mThumbnailView.setEnabled(enable);
}
- mIndicatorControlContainer的enable的設置
Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View v = getChildAt(i);
// Zoom buttons and shutter button are controlled by the activity.
if (v instanceof AbstractIndicatorButton) {
v.setEnabled(enabled);
// Show or hide the indicator buttons during recording.
if (mCurrentMode == MODE_VIDEO) {
v.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
}
}
}
if (mCameraPicker != null) {
mCameraPicker.setEnabled(enabled);
if (mCurrentMode == MODE_VIDEO) {
mCameraPicker.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
}
}
}
private final class AutoFocusCallback
implements android.hardware.Camera.AutoFocusCallback {
public void onAutoFocus(
boolean focused, android.hardware.Camera camera) {
//如果是暫停狀態，不聚焦
if (mPausing) return;
//算出當前到聚焦開始的時間差
mAutoFocusTime = System.currentTimeMillis() - mFocusStartTime;
Log.v(TAG, "mAutoFocusTime = " + mAutoFocusTime + "ms");
//設置Camera狀態為
setCameraState(IDLE);
//調用FocusManager中的AutoFocus
mFocusManager.onAutoFocus(focused);
}
}
FocusManager.java
/**
* 聚焦
* @param focused
*/
public void onAutoFocus(boolean focused) {
Log.i(TAG, "focus used : " + (System.currentTimeMillis() - focusStart));
//正在進行聚焦，拍照動作必須再聚焦完之后
if (mState == STATE_FOCUSING_SNAP_ON_FINISH) {
// 無論聚焦成功還是失敗，都會拍照。如果要進行拍照發聲，就無需AF發聲了
if (focused) {
//聚焦成功
mState = STATE_SUCCESS;
} else {
//聚焦失敗
mState = STATE_FAIL;
}
//更新聚焦框UI&&設置人臉識別UI已經各種狀態的設置
updateFocusUI();
//拍照，mState的狀態變為STATE_IDLE
capture();
} else if (mState == STATE_FOCUSING) {//如果是聚焦中的狀態
//此狀態的發生分為兩種，half-pressing按壓聚焦或者觸摸聚焦被觸發，這個時候不要發生拍照動作
if (focused) {
//聚焦成功
mState = STATE_SUCCESS;
//在連續聚焦狀態不要發聲，聚焦回調會在拍照前完成，所有狀態一直為STATE_FOCUSING
if (!Parameters.FOCUS_MODE_CONTINUOUS_PICTURE.
equals(mFocusMode)) {
mListener.playSound(CameraSound.FOCUS_COMPLETE);
}
} else {
//聚焦失敗
mState = STATE_FAIL;
}
//更新聚焦&&人臉UI
updateFocusUI();
// If this is triggered by touch focus, cancel focus after a
// while.
//如果是觸摸聚焦，需要延遲一下取消掉聚焦
if (mFocusArea != null) {
mHandler.sendEmptyMessageDelayed(RESET_TOUCH_FOCUS, RESET_TOUCH_FOCUS_DELAY);
}
} else if (mState == STATE_IDLE) {//空閑
// User has released the focus key before focus completes.
// Do nothing.
}
}
private class MainHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case RESET_TOUCH_FOCUS: {
//取消掉聚焦
cancelAutoFocus();
//開始人臉識別
mListener.startFaceDetection();
break;
}
}
}
}
/**
* 再重置tap area之前調用mListener.cancelAutofocus，否則，聚焦模式將一直是自動&tap聚焦，並且驅動也不會重置
*/
private void cancelAutoFocus() {
//放置聚焦框到屏幕中間
resetTouchFocus();
mListener.cancelAutoFocus();
if (mFaceView != null) mFaceView.resume();
mState = STATE_IDLE;
updateFocusUI();
mHandler.removeMessages(RESET_TOUCH_FOCUS);
}
/**
* 觸摸，，這里會發生觸摸聚焦
* @param e
* @return
*/
public boolean onTouch(MotionEvent e) {
//沒有初始化或者拍照前的聚焦的狀態，直接返回
if (!mInitialized || mState == STATE_FOCUSING_SNAP_ON_FINISH) return false;
//讓用戶可以取消掉之前未消失的觸摸聚焦
if ((mFocusArea != null) && (mState == STATE_FOCUSING ||
mState == STATE_SUCCESS || mState == STATE_FAIL)) {
cancelAutoFocus();
}
// Initialize variables.
int x = Math.round(e.getX());
int y = Math.round(e.getY());
int focusWidth = mFocusIndicatorRotateLayout.getWidth();
int focusHeight = mFocusIndicatorRotateLayout.getHeight();
int previewWidth = mPreviewFrame.getWidth();
int previewHeight = mPreviewFrame.getHeight();
if (mFocusArea == null) {
mFocusArea = new ArrayList<Area>();
mFocusArea.add(new Area(new Rect(), 1));
mMeteringArea = new ArrayList<Area>();
mMeteringArea.add(new Area(new Rect(), 1));
}
//將坐標轉換為驅動的格式。AE面積更大,因為曝光會敏感和容易，或者說曝光不足,如果面積太小了。
calculateTapArea(focusWidth, focusHeight, 1f, x, y, previewWidth, previewHeight,
mFocusArea.get(0).rect);
calculateTapArea(focusWidth, focusHeight, 1.5f, x, y, previewWidth, previewHeight,
mMeteringArea.get(0).rect);
// Use margin to set the focus indicator to the touched area.
RelativeLayout.LayoutParams p =
(RelativeLayout.LayoutParams) mFocusIndicatorRotateLayout.getLayoutParams();
int left = Util.clamp(x - focusWidth / 2, 0, previewWidth - focusWidth);
int top = Util.clamp(y - focusHeight / 2, 0, previewHeight - focusHeight);
p.setMargins(left, top, 0, 0);
// Disable "center" rule because we no longer want to put it in the center.
int[] rules = p.getRules();
rules[RelativeLayout.CENTER_IN_PARENT] = 0;
mFocusIndicatorRotateLayout.requestLayout();
//停止人臉識別，因為要進行識別聚焦和測量area
mListener.stopFaceDetection();
//設置聚焦區域&測量區域
mListener.setFocusParameters();
//如果支持觸摸聚焦&&手指抬起
if (mFocusAreaSupported && (e.getAction() == MotionEvent.ACTION_UP)) {
autoFocus();
} else { // Just show the indicator in all other cases.
updateFocusUI();
// Reset the metering area in 3 seconds.
mHandler.removeMessages(RESET_TOUCH_FOCUS);
mHandler.sendEmptyMessageDelayed(RESET_TOUCH_FOCUS, RESET_TOUCH_FOCUS_DELAY);
}
return true;
}
聚焦各個狀態能做什么事不能做什么事&切換
doSnap()：空閑狀態可以執行拍照
onAutoFocus(boolean focused)：用戶再聚焦完成前放掉了聚焦按鈕，所以不做任何事。
onPreviewStarted()，onPreviewStopped()：狀態都變為空閑
cancelAutoFocus()：取消聚焦，狀態變為空閑
updateFocusUI()：如果空閑&有聚焦區域，顯示聚焦框框
onShutterUp()：如果是focusmode為自動聚焦，狀態為正在聚焦，則取消掉聚焦
doSnap()：如果是正在聚焦狀態，將狀態改為聚焦完拍照狀態
onAutoFocus(boolean focused)：判斷focused，為true變為聚焦成功狀態，為false變為聚焦失敗狀態
onTouch(MotionEvent e)：如果正在聚焦&之前有手動聚焦了，則取消掉之前的聚焦
autoFocus()：狀態變為聚焦狀態
updateFocusUI()：顯示聚焦的框框
- STATE_FOCUSING_SNAP_ON_FINISH
onShutterUp()：狀態不是聚焦完拍照，可以設置FocusParameters
onAutoFocus(boolean focused)：判斷focused，為true變為聚焦成功狀態，為false變為聚焦失敗狀態，更新聚焦框UI
onTouch(MotionEvent e)：直接不繼續操作下去
updateFocusUI()：顯示聚焦的框框
onShutterDown()：如果是自動聚焦mode，並且不為聚焦成功狀態，執行聚焦
onShutterUp()： 如果是自動聚焦mode，並且為聚焦成功狀態，執行取消聚焦
doSnap()：拍照
onTouch(MotionEvent e)：讓用戶可以取消掉之前未消失的觸摸聚焦
updateFocusUI()：聚焦框框顯示成功
onShutterDown()：如果是自動聚焦mode，並且不為聚焦失敗狀態，執行聚焦
onShutterUp()： 如果是自動聚焦mode，並且為聚焦失敗狀態，執行取消聚焦
doSnap()：拍照
onTouch(MotionEvent e)：讓用戶可以取消掉之前未消失的觸摸聚焦
updateFocusUI()：聚焦框框顯示失敗
我是天王蓋地虎的分割線
