Android 摄像头调用（不含拍照）

private void setCameraDisplayOrientation(Activity activity,int cameraId,Camera camera){

Camera.CameraInfo info = new Camera.CameraInfo();

Camera.getCameraInfo(cameraId,info);

//获得旋转角度

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();

int degrees = 0;

switch (rotation) {

case Surface.ROTATION_0: //没有旋转

degrees = 0;

break;

case Surface.ROTATION_90: //旋转90°

degrees = 90;

break;

case Surface.ROTATION_180: //180

degrees = 180;

break;

case Surface.ROTATION_270:

degrees = 270;

break;

}

int result = 0;

if(info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){

//前置摄像头旋转算法

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360;

}else{

result = (info.orientation - degrees + 360) % 360;

}

ROTATE = result + 180;

camera.setDisplayOrientation(result); //设置拍摄角度

}

然后设置焦距和打开的竖屏横屏

private void setCamera(){

if(checkCameraHadware()){

camera = openFrontFacingCameraGingerbread();

//设置摄像头方向调整摄像头旋转90度，成竖屏

setCameraDisplayOrientation(this,mCurrentCamIndex,camera);

Camera.Parameters parameters = camera.getParameters();

parameters.setPictureFormat(ImageFormat.JPEG);

List list= parameters.getSupportedFocusModes(); //获取支持的对焦格式

for(String str : list){

Log.e(TAG,“支持的对焦模式：”+ str );

}

//手机支持的图片尺寸合集

List<Camera.Size> pictureList = parameters.getSupportedPictureSizes();

//手机支持的预览尺寸集合

List<Camera.Size> previewList = parameters.getSupportedPreviewSizes();

//设置为当前使用手机的最大尺寸

parameters.setPictureSize(pictureList.get(0).width,pictureList.get(0).height);

minFocus = parameters.getZoom(); //获得最小焦距

maxFocus = parameters.getMaxZoom();

everyFocus = 1; //每次增加及减少值

nowFocus = minFocus; //当前焦距为最小值

seekBar.setMax(maxFocus); //设置最大焦距

Log.e(TAG,“当前镜头距离：” + minFocus + “\t\t获取最大距离：” + maxFocus); //日志打印

camera.setParameters(parameters);

}

}

最后在surfaceview上打开摄像头

使用了 camera.setPreviewDisplay(holder)来打开

camera.setPreviewCallback(null)、 camera.stopPreview()来关闭

@Override

public void surfaceCreated(SurfaceHolder holder) {

Log.e(“surfaceCreated”,“绘制开始”);

try{

setCamera();

camera.setPreviewDisplay(holder);

} catch (IOException e) {

camera.release();

camera = null;

e.printStackTrace();

}

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

Log.e(“surfaceChanged”,“绘制改变”);

try{

camera.stopPreview();

camera.setPreviewDisplay(holder);

camera.startPreview();

} catch (IOException e) {

e.printStackTrace();

}

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

Log.e(“surfaceDestroyed”,“绘制结束”);

camera.setPreviewCallback(null);

camera.stopPreview();

camera.release();

camera = null;

}

还有其中对seekbar和buttom的调焦操作

//设置相机参数

private void setZoomValues(int want){

Camera.Parameters parameters = camera.getParameters(); //获得相机参数

seekBar.setProgress(want); //设置进度

parameters.setZo
om(want); //设置焦距参数

camera.setParameters(parameters); //设置相机参数，焦距

}

//获取相机参数和当前焦距

private int getZoomValues(){

Camera.Parameters parameters = camera.getParameters();

int values = parameters.getZoom();

return values;

}

//调节焦距

//添加

private void addZoomValues(){

if(nowFocus > maxFocus){

Log.e(TAG,“大于maxFocus是不可能的”);

}else if(nowFocus == maxFocus){

}else {

setZoomValues(getZoomValues() + everyFocus);

}

}

//缩小

private void minusZoomValues(){

if(nowFocus < minFocus){

Log.e(TAG,“小于minFocus是不可能的”);

}else if(nowFocus == minFocus){

}else {

setZoomValues(getZoomValues() - everyFocus);

}

}

public void onProgressChanged(SeekBar seekBar,int progress,boolean fromUser){

Camera.Parameters parameters = camera.getParameters();

nowFocus = progress;

parameters.setZoom(progress);

camera.setParameters(parameters);

}

public boolean onTouch(View v, MotionEvent event){

switch (v.getId()){

case R.id.add:

addZoomValues(); //放大焦距

break;

case R.id.minus:

minusZoomValues(); //缩小焦距

break;