流程圖

applySettings.png

APP 層應(yīng)用參數(shù)設(shè)置

mCameraDevice.applySettings(mCameraSettings);

frameworks 層獲取參數(shù)設(shè)置發(fā)送獲取圖像的請求

    private void applyToRequest(AndroidCamera2Settings settings) {
        // TODO: If invoked when in PREVIEW_READY state, a new preview size will not take effect
        // 獲取所有的參數(shù)設(shè)置，然后放到一個 Map 集合
        // 創(chuàng)建捕獲請求時會調(diào)用 CaptureRequest.Builder.set() 設(shè)置捕獲請求的參數(shù)設(shè)置
        mPersistentSettings.union(settings.getRequestSettings());
        ...
        // If we're already previewing, reflect most settings immediately
        try {
            // 向相機設(shè)備發(fā)送獲取圖像的請求
            mSession.setRepeatingRequest(
                    mPersistentSettings.createRequest(mCamera,
                            CameraDevice.TEMPLATE_PREVIEW, mPreviewSurface)/*創(chuàng)建一次捕獲請求*/,
                    /*listener*/mCameraResultStateCallback, /*handler*/this);
        } catch (CameraAccessException ex) {
            Log.e(TAG, "Failed to apply updated request settings", ex);
        }
        ...
    }