Android(安卓)实现拍照功能

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 = new SurfacePreView(this, mCamera);
4）实现拍照 mCamera.autoFocus
5）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="http://schemas.android.com/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" >    </FrameLayout>    <Button  android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="takephoto" android:text="拍照" /></LinearLayout>

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