【移动应用开发技术】Android中怎么实现拍照功能

【移动应用开发技术】Android中怎么实现拍照功能

这期内容当中在下将会给大家带来有关Android中怎么实现拍照功能，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。解析：1）判断是否有摄像头checkCameraHardware(this)2）获得相机camera=Camera.open(0);3）把相机添加到mPreView=newSurfacePreView(this,mCamera);4）实现拍照mCamera.autoFocus5）在拍照后使用mCamera.takePicture(null,null,mPicture);方法把图片保存到sdcard代码实现:/**

*

使用照相机拍照

*

@author

chen.lin

*

*/

public

class

CameraActivity

extends

Activity

{

private

Camera

mCamera;//相机

private

SurfacePreView

mPreView;//视图

private

FrameLayout

mFrameLayout;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_camera_takephoto);

mFrameLayout

=

(FrameLayout)

findViewById(R.id.framelayout);

if

(checkCameraHardware(this))

{

mCamera

=

getCamera();

mPreView

=

new

SurfacePreView(this,

mCamera);

mFrameLayout.addView(mPreView);

}

}

/**

*

拍照对焦

*

@param

view

*/

public

void

takephoto(View

view){

mCamera.autoFocus(new

AutoFocusCallback()

{

@Override

public

void

onAutoFocus(boolean

success,

Camera

camera)

{

mCamera.takePicture(null,

null,

mPicture);

}

});

}

/**

*

拍照后的图片保存

*/

private

PictureCallback

mPicture

=

new

PictureCallback()

{

@Override

public

void

onPictureTaken(byte[]

data,

Camera

camera)

{

try

{

File

file

=

new

File("/sdcard/file/aa.jpg");

if

(!file.exists())

{

file.mkdirs();

}

FileOutputStream

fos

=

new

FileOutputStream(file);

fos.write(data);

fos.close();

}

catch

(FileNotFoundException

e)

{

e.printStackTrace();

}

catch

(IOException

e)

{

e.printStackTrace();

}

}

};

/**

*

判断照相机是否存在

*

@param

context

*

@return

*/

private

boolean

checkCameraHardware(Context

context){

if

(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA))

{

return

true;

}

return

false;

}

/**

*

初始化照相机

*

@return

*/

public

static

Camera

getCamera(){

Camera

camera

=

null;

try

{

camera

=

Camera.open(0);

}

catch

(Exception

e)

{

e.printStackTrace();

}

return

camera;

}

/**

*

实现拍照视图

*/

@SuppressWarnings("deprecation")

private

class

SurfacePreView

extends

SurfaceView

implements

SurfaceHolder.Callback{

private

Camera

mCamera;

private

SurfaceHolder

mHolder;

public

SurfacePreView(Context

context,

Camera

camera)

{

super(context);

mCamera

=

camera;

mHolder

=

getHolder();

mHolder.addCallback(this);

mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

@Override

public

void

surfaceCreated(SurfaceHolder

holder)

{

try

{

mCamera.setPreviewDisplay(mHolder);

mCamera.startPreview();

}

catch

(IOException

e)

{

e.printStackTrace();

}

}

@Override

public

void

surfaceChanged(SurfaceHolder

holder,

int

format,

int

width,

int

height)

{

if

(holder.getSurface()

==

null)

{

return;

}

try

{

mCamera.stopPreview();

mCamera.setPreviewDisplay(mHolder);

mCamera.startPreview();

}

catch

(IOException

e)

{

e.printStackTrace();

}

}

@Override

public

void

surfaceDestroyed(SurfaceHolder

holder)

{

//

mCamera

=

null;

}

}

}布局：<?xml

version="1.0"

encoding="utf-8"?>

<LinearLayout

xmlns:android="/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

>

<FrameLayout

android:id="@+id/framelayout"

android:layout_width="wrap_content"

android:layout_height="0dp"

android:layout_weight="1"

>

</FrameLayou