实现的效果是当加速器的变化在设定范围外时，相机会自动对焦。public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {private SurfaceView surfaceview;private SurfaceHolder surfaceholder;private Camera camera = null;private ImageView imageView;private Button startPre;private Button stopPre;private Button getPicture;private SensorManager sensorManager;private MyListener myListener;private Sensor mySensor;private float mLastX;private float mLastY;private float mLastZ;private boolean initBool = false;private boolean myAutoFocus = true;private Camera.AutoFocusCallback autoFocusCallback;private Camera.Parameters parameters;private WindowManager wm;private int screenWidth;private int screenHeight;/* 通过Camera方式来实现拍照通过Camera方式 会比通过Intent方式获得更为丰富的功能。通常创建一个定制化的Camera需要如下步骤：(1) 通过Camera.open()来获取Camera实例。(2) 创建Preview类，需要继承SurfaceView类并实现SurfaceHolder.Callback接口。(3) 为相机设置Preview(4) 构建一个Preview的Layout来 预览相机；(5) 为拍照建立Listener以获取拍照后的回调;(6) 拍照并保存文件;(7) 释放Camera。*/@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initSensor();initView();initEvent();}//初始化加速传感器private void initSensor() {sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);mySensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);myListener = new MyListener();List<Sensor> list = sensorManager.getSensorList(Sensor.TYPE_ALL);//全部传感器for(Sensor sensor:list){Log.i("----->",""+sensor.getName());}}private void initView() {surfaceview = (SurfaceView) findViewById(R.id.surfaceview);startPre = (Button) this.findViewById(R.id.beginPrievw);stopPre = (Button) this.findViewById(R.id.stopPrievw);getPicture = (Button) this.findViewById(R.id.getPicture);imageView = (ImageView) this.findViewById(R.id.imageView);}private void initEvent() {surfaceholder = surfaceview.getHolder();surfaceholder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);surfaceholder.addCallback(this);stopPre.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {camera.stopPreview();}});getPicture.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {camera.takePicture(null, null, pictureCallback);}});//初始化自动对焦回掉autoFocusCallback = new Camera.AutoFocusCallback() {@Overridepublic void onAutoFocus(boolean b, Camera camera) {myAutoFocus = true;if (b) {camera.cancelAutoFocus();Log.i("=========>", "对焦成功！");} else {Log.i("=========>", "对焦失败！");}}};//获取屏幕的宽和高wm = (WindowManager)this.getSystemService(Context.WINDOW_SERVICE);screenWidth = wm.getDefaultDisplay().getWidth();screenHeight = wm.getDefaultDisplay().getHeight();}@Overridepublic void surfaceCreated(SurfaceHolder surfaceHolder) {Log.i("------->", "surfaceCreated");System.out.println("surfacecreated");//获取camera对象if (camera == null) {camera = Camera.open();Log.i("------->", "Camera open");}try {//设置预览监听camera.setPreviewDisplay(surfaceHolder);parameters = camera.getParameters();List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes();// parameters.setPictureFormat(PixelFormat.JPEG);// parameters.setJpegQuality(CameraProfile.QUALITY_HIGH);Log.i("pictureFromat",""+parameters.getPictureFormat());parameters.setPictureSize(3840, 2160);//获得相机的对焦模式有哪些// List<String> focusModes = parameters.getSupportedFocusModes();// for (String mode:focusModes){// // Log.i("==-------->",""+mode);// }parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);// List<String> focusModes = parameters.getSupportedFocusModes();////得到摄像头支持的分辨率//if (sizeList.size() > 1){//Iterator<Camera.Size> itor = sizeList.iterator();//while(itor.hasNext()){//Camera.Size cur = itor.next();//Log.i("------->","width:"+cur.width+" "+cur.height);//}// }//设置预览的方向if (this.getResources().getConfiguration().orientation!= Configuration.ORIENTATION_LANDSCAPE) {parameters.set("orientation", "portrait");camera.setDisplayOrientation(90);parameters.setRotation(90);} else {parameters.set("orientation", "landscape");camera.setDisplayOrientation(0);parameters.setRotation(0);}camera.setParameters(parameters);camera.startPreview();//camera.cancelAutoFocus();} catch (IOException e) {e.printStackTrace();camera.release();Log.e("---->","摄像头创建失败");}}@Overridepublic void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {Log.i("------->", "surfaceChanged");myAutoFocus();}//对焦private void myAutoFocus() {try {camera.autoFocus(autoFocusCallback);} catch (Exception e) {Log.d("---->", "" + e.getMessage());}}@Overridepublic void surfaceDestroyed(SurfaceHolder surfaceHolder) {Log.i("------->", "surfaceDestroyed");System.out.println("surfaceDestroyed");if (camera != null) {camera.stopPreview();camera.release();camera = null;}}/* camera.takePicture(shutterCallback,rawcallback,pictureCallback);*/private Camera.ShutterCallback shutterCallback = new Camera.ShutterCallback() {@Overridepublic void onShutter() {//按下快门瞬间的处理事件处}};private Camera.PictureCallback rawcallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] bytes, Camera camera) {//处理raw代码}};private Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] bytes, Camera camera) {File pictureFile = getOutputMediafile();if (pictureFile == null) {Log.e("--------->", "获取文件路径失败！");return;}try {FileOutputStream fos = new FileOutputStream(pictureFile);fos.write(bytes);fos.close();Log.i("--------->", "照片保存文件成功！");} catch (FileNotFoundException e) {Log.d("-------->", "row");} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}Bitmap bitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length);imageView.setImageBitmap(bitmap);camera.startPreview();}};//加速传感器监听public class MyListener implements SensorEventListener{@Overridepublic void onSensorChanged(SensorEvent sensorEvent) {//values[0]:X轴，values[1]：Y轴，values[2]：Z轴float[] values = sensorEvent.values;float x = values[0];float y = values[1];float z = values[2];if (!initBool){mLastX = x;mLastY = y;mLastZ = z;initBool = !initBool;}float deltaX = Math.abs(mLastX - x);float deltaY = Math.abs(mLastY - y);float deltaZ = Math.abs(mLastZ - z);if (deltaX > .5 && myAutoFocus){myAutoFocus = false;myAutoFocus();}if (deltaY > .5 && myAutoFocus){myAutoFocus = false;Log.i("---====---->","");myAutoFocus();}if (deltaZ > .5 && myAutoFocus){myAutoFocus = false;Log.i("---====---->","");myAutoFocus();}mLastX = x;mLastY = y;mLastZ = z;}@Overridepublic void onAccuracyChanged(Sensor sensor, int i) {//传感器精度变化时使用}}private File getOutputMediafile() {File picDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());String path = picDir.getPath() + File.separator + "IMAGE_" + timeStamp + ".jpg";Log.i("------------>", "文件保存路径是：" + path);return new File("/sdcard/Pictures/Test" + "IMAGE_" + timeStamp + ".jpg");}@Overrideprotected void onPause() {super.onPause();camera.stopPreview();//注销传感器监听事件，若不，后台仍继续运行sensorManager.unregisterListener(myListener);}@Overrideprotected void onResume() {super.onResume();camera.startPreview();//注册传感器监听事件boolean result = sensorManager.registerListener(myListener,mySensor,SensorManager.SENSOR_DELAY_NORMAL);Log.i("----->",""+result);}}布局文件<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.myapplication.MainActivity"><SurfaceViewandroid:id="@+id/surfaceview"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_alignParentTop="true"/><ImageViewandroid:id="@+id/imageView"android:layout_width="100dp"android:layout_height="100dp"android:layout_alignParentRight="true"android:layout_alignParentTop="true"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_above="@+id/stopPrievw"android:layout_marginBottom="10dp"android:text="拍摄照片"android:id="@+id/getPicture"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="停止预览"android:layout_alignParentBottom="true"android:id="@+id/stopPrievw"/></RelativeLayout>
