Android(安卓)摄像头自动对焦的几点注意

今天在做手机摄像头自动对焦时出了一些问题，这里做个笔记记录一下。

注意事项：1、初始化Camera的代码中要加入下面两行代码

mCamera.autoFocus(myAutoFocusCallback);mCamera.cancelAutoFocus();

示例：

private void initCamera(SurfaceHolder holder) {        Log.i(TAG, "initCamera..");        if (mPreviewRunning) {            mCamera.stopPreview();        }        Camera.Parameters parameters;        try {            parameters = mCamera.getParameters();        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();            return;        }        parameters.setPreviewSize(videoWidth, videoHight);        parameters.setPictureFormat(PixelFormat.JPEG);        parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP);        SetCameraFPS(parameters);        setCameraDisplayOrientation(this, curCameraIndex, mCamera);        mCamera.setParameters(parameters);        int bufferSize = (((videoWidth | 0xf) + 1) * videoHight * ImageFormat.getBitsPerPixel(parameters.getPreviewFormat())) / 8;        mCamera.addCallbackBuffer(new byte[bufferSize]);        mCamera.setPreviewCallbackWithBuffer(this);        try {            mCamera.setPreviewDisplay(holder);        } catch (Exception ex) {            // TODO Auto-generated catch block            if (null != mCamera) {                mCamera.release();                mCamera = null;            }            ex.printStackTrace();        }        mCamera.startPreview();        mCamera.autoFocus(myAutoFocusCallback);        mCamera.cancelAutoFocus();        mPreviewRunning = true;    }

myAutoFocusCallback相关代码：

   private Camera.AutoFocusCallback myAutoFocusCallback = null;...//自动聚焦变量回调        myAutoFocusCallback = new Camera.AutoFocusCallback() {            public void onAutoFocus(boolean success, Camera camera) {                if (success)//success表示对焦成功                {                    Log.i(TAG, "onAutoFocus succeed...");                    camera.cancelAutoFocus();//只有加上了这一句，才会自动对焦。                    initCamera(mSurfaceHolder);                    doAutoFocus();                } else {                    Log.i(TAG, "onAutoFocus failed...");                }            }        };

注意事项2：也是上面代码中的一个聚焦的方法doAutoFocus

//设置聚焦    private void doAutoFocus() {        parameters = mCamera.getParameters();        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);        mCamera.setParameters(parameters);        mCamera.autoFocus(new Camera.AutoFocusCallback() {            @Override            public void onAutoFocus(boolean success, Camera camera) {                if (success) {                    camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。                    if (!Build.MODEL.equals("KORIDY H30")) {                        parameters = camera.getParameters();                        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 连续自动对焦                        camera.setParameters(parameters);                    } else {                        parameters = camera.getParameters();                        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);                        camera.setParameters(parameters);                    }                }            }        });    }

这里面有个注释是 “连续自动对焦”，如果不选择这个模式只能实现一开始自动对焦一次然后在远近变化就不对焦了

最后完整代码贴一份，后面在找这个代码就方便了不用打开工程去找：

package com.star.surveillance.live;import android.Manifest;import android.annotation.SuppressLint;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.pm.PackageManager;import android.graphics.ImageFormat;import android.graphics.PixelFormat;import android.hardware.Camera;import android.media.AudioManager;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.support.annotation.RequiresApi;import android.support.v4.app.ActivityCompat;import android.util.Log;import android.view.Surface;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.WindowManager;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.RelativeLayout;import com.star.star_common.util.ActivityStyleUtil;import com.star.star_common.util.ToastUtil;import com.star.star_common.view.StarTextView;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import static com.star.star_common.constants.StarConstants.TAG;public class RecordActivity extends Activity implements SurfaceHolder.Callback, Camera.PreviewCallback {    private LinearLayout rightBtnsLL;    private FrameLayout playFL;    private StarTextView backTV;    private ImageView backIV;    private ImageView switchCameraIV;    private ImageView voiceIV;    private StarTextView topBackTV;    private RelativeLayout topTitleRL;    private RelativeLayout backRL;    private int previousVolume = 10;    private View main;    private MyVolumeReceiver mVolumeReceiver;    private Uri fileUri;    private Camera mCamera = null;    private Camera.AutoFocusCallback myAutoFocusCallback = null;    private SurfaceView mSurfaceView = null;    private SurfaceHolder mSurfaceHolder = null;    private static final int FRONT = 1;        //前置摄像头标记    private static final int BACK = 2;        //后置摄像头标记    private int currentCameraType = BACK;    //当前打开的摄像头标记    private int curCameraIndex = -1;    private boolean mPreviewRunning = false;    private final int videoWidth = 1280;    private final int videoHight = 720;    private int frameCount = 0;    private Camera.Parameters parameters;//相机参数    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        ActivityStyleUtil.setStatusTransparentStyle(this, false);        main = getLayoutInflater().inflate(R.layout.activity_record, null);        main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE);        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);    //屏幕常亮        setContentView(main);/*        Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);        try {            fileUri = Uri.fromFile(createMediaFile()); // create a file to save the video        } catch (Exception e) {            e.printStackTrace();        }        intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);  // set the image file name        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1); // set the video image quality to high        // start the Video Capture Intent        startActivityForResult(intent, 1);*/        int permission = ActivityCompat.checkSelfPermission(this,                android.Manifest.permission.READ_PHONE_STATE);        if (permission != PackageManager.PERMISSION_GRANTED) {            // We don't have permission so prompt the user            ActivityCompat.requestPermissions(this, new String[]{                    android.Manifest.permission.RECORD_AUDIO,                    android.Manifest.permission.READ_EXTERNAL_STORAGE,                    android.Manifest.permission.READ_PHONE_STATE,                    android.Manifest.permission.WRITE_EXTERNAL_STORAGE,                    android.Manifest.permission.CAMERA,                    android.Manifest.permission.CHANGE_WIFI_MULTICAST_STATE,                    android.Manifest.permission.INTERNET,                    android.Manifest.permission.ACCESS_NETWORK_STATE,                    android.Manifest.permission.ACCESS_WIFI_STATE,                    android.Manifest.permission.WAKE_LOCK,                    android.Manifest.permission.VIBRATE,                    android.Manifest.permission.SYSTEM_ALERT_WINDOW,            }, 1);        }        initView();        registerVolumeReceiver();    }    @Override    protected void onDestroy() {        super.onDestroy();        try {            if (mVolumeReceiver != null) {                unregisterReceiver(mVolumeReceiver);                mVolumeReceiver = null;            }        } catch (Exception e) {            e.printStackTrace();        }    }    private void initView() {        backIV = (ImageView) findViewById(R.id.surveillance_common_back_iv);        topTitleRL = (RelativeLayout) findViewById(R.id.surveillance_common_top_rl);        topTitleRL.setBackgroundResource(R.drawable.surveillance_record_back_bj);        topBackTV = (StarTextView) findViewById(R.id.surveillance_common_back_tv);        topBackTV.setText("手机录制");        playFL = (FrameLayout) findViewById(R.id.surveillance_record_fl);        backTV = (StarTextView) findViewById(R.id.surveillance_common_back_tv);        backRL = (RelativeLayout) findViewById(R.id.surveillance_common_back_rl);        backRL.setOnClickListener(mClickListener);        voiceIV = (ImageView) findViewById(R.id.surveillance_record_mute_iv);        voiceIV.setOnClickListener(mClickListener);        rightBtnsLL = (LinearLayout) findViewById(R.id.surveillance_record_right_btn_ll);        if (getCurrentVolume() == 0) {            voiceIV.setBackgroundResource(R.drawable.surveillance_record_mute);        }        mSurfaceView = (SurfaceView) findViewById(R.id.surface);        mSurfaceView.setOnClickListener(mClickListener);        mSurfaceHolder = mSurfaceView.getHolder();        mSurfaceHolder.addCallback(this);        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        switchCameraIV = (ImageView) findViewById(R.id.surveillance_record_switch_camera_iv);        switchCameraIV.setOnClickListener(mClickListener);        //自动聚焦变量回调        myAutoFocusCallback = new Camera.AutoFocusCallback() {            public void onAutoFocus(boolean success, Camera camera) {                if (success)//success表示对焦成功                {                    Log.i(TAG, "onAutoFocus succeed...");                    camera.cancelAutoFocus();//只有加上了这一句，才会自动对焦。                    initCamera(mSurfaceHolder);                    doAutoFocus();                } else {                    Log.i(TAG, "onAutoFocus failed...");                }            }        };    }    private View.OnClickListener mClickListener = new View.OnClickListener() {        @Override        public void onClick(View v) {            if (v.getId() == R.id.surveillance_record_mute_iv) {                if (getCurrentVolume() == 0) {                    voiceIV.setBackgroundResource(R.drawable.surveillance_record_voice);                } else {                    voiceIV.setBackgroundResource(R.drawable.surveillance_record_mute);                }                setStreamVolume();            } else if (v.getId() == R.id.surveillance_common_back_rl) {                onBackPressed();            } else if (v.getId() == R.id.surveillance_record_switch_camera_iv) {            } else if (v.getId() == R.id.surface) {                doAutoFocus();            }        }    };    public void setStreamVolume() {        AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);        int volume = am.getStreamVolume(AudioManager.STREAM_MUSIC);        if (volume == 0) {            am.setStreamVolume(AudioManager.STREAM_MUSIC, previousVolume, AudioManager.FLAG_PLAY_SOUND);        } else {            previousVolume = volume;            am.setStreamVolume(AudioManager.STREAM_MUSIC, 0, AudioManager.FLAG_PLAY_SOUND);        }    }    public int getCurrentVolume() {        AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);        int volume = am.getStreamVolume(AudioManager.STREAM_MUSIC);        return volume;    }    //动态获取内存存储权限    public static void verifyStoragePermissions(Activity activity) {        // Check if we have write permission        int permission = ActivityCompat.checkSelfPermission(activity,                Manifest.permission.WRITE_EXTERNAL_STORAGE);        if (permission != PackageManager.PERMISSION_GRANTED) {            // We don't have permission so prompt the user            ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);        }    }    @Override    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {        switch (requestCode) {            case 1: {                // If request is cancelled, the result arrays are empty.                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                } else {                    ToastUtil.showLongToast("需要SD卡权限才可以使用此功能");                }                return;            }        }    }    @Override    public void onBackPressed() {        finish();    }    /**     * 注册当音量发生变化时接收的广播     */    private void registerVolumeReceiver() {        mVolumeReceiver = new MyVolumeReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction("android.media.VOLUME_CHANGED_ACTION");        registerReceiver(mVolumeReceiver, filter);    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        Log.i(TAG, "surfaceCreated..");        try {            int CammeraIndex = findBackCamera();            Log.i(TAG, "BackCamera: " + CammeraIndex);            if (CammeraIndex == -1) {                CammeraIndex = findFrontCamera();                currentCameraType = FRONT;                switchCameraIV.setEnabled(false);                if (CammeraIndex == -1) {                    Log.i(TAG, "NO camera!!");                    return;                }            } else {                currentCameraType = BACK;            }            if (mCamera == null) {                mCamera = openCamera(currentCameraType);            }        } catch (Exception e) {            e.printStackTrace();        }    }    @SuppressLint("NewApi")    private Camera openCamera(int type) {        int frontIndex = -1;        int backIndex = -1;        int cameraCount = Camera.getNumberOfCameras();        Log.i(TAG, "cameraCount: " + cameraCount);        Camera.CameraInfo info = new Camera.CameraInfo();        for (int cameraIndex = 0; cameraIndex < cameraCount; cameraIndex++) {            Camera.getCameraInfo(cameraIndex, info);            if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {                frontIndex = cameraIndex;            } else if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {                backIndex = cameraIndex;            }        }        currentCameraType = type;        if (type == FRONT && frontIndex != -1) {            curCameraIndex = frontIndex;            return Camera.open(frontIndex);        } else if (type == BACK && backIndex != -1) {            curCameraIndex = backIndex;            return Camera.open(backIndex);        }        return null;    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {        Log.i(TAG, "surfaceChanged..");        initCamera(holder);        mCamera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦        doAutoFocus();    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {    }    //Check if it has back camera    private int findBackCamera() {        int cameraCount = 0;        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();        cameraCount = Camera.getNumberOfCameras();        for (int camIdx = 0; camIdx < cameraCount; camIdx++) {            Camera.getCameraInfo(camIdx, cameraInfo);            if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {                return camIdx;            }        }        return -1;    }    //监听    //Check if it has front camera    private int findFrontCamera() {        int cameraCount = 0;        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();        cameraCount = Camera.getNumberOfCameras();        for (int camIdx = 0; camIdx < cameraCount; camIdx++) {            Camera.getCameraInfo(camIdx, cameraInfo);            if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {                return camIdx;            }        }        return -1;    }    /*it will call when surfaceChanged*/    private void initCamera(SurfaceHolder holder) {        Log.i(TAG, "initCamera..");        if (mPreviewRunning) {            mCamera.stopPreview();        }        Camera.Parameters parameters;        try {            parameters = mCamera.getParameters();        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();            return;        }        parameters.setPreviewSize(videoWidth, videoHight);        parameters.setPictureFormat(PixelFormat.JPEG);        parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP);        SetCameraFPS(parameters);        setCameraDisplayOrientation(this, curCameraIndex, mCamera);        mCamera.setParameters(parameters);        int bufferSize = (((videoWidth | 0xf) + 1) * videoHight * ImageFormat.getBitsPerPixel(parameters.getPreviewFormat())) / 8;        mCamera.addCallbackBuffer(new byte[bufferSize]);        mCamera.setPreviewCallbackWithBuffer(this);        try {            mCamera.setPreviewDisplay(holder);        } catch (Exception ex) {            // TODO Auto-generated catch block            if (null != mCamera) {                mCamera.release();                mCamera = null;            }            ex.printStackTrace();        }        mCamera.startPreview();        mCamera.autoFocus(myAutoFocusCallback);        mCamera.cancelAutoFocus();        mPreviewRunning = true;    }    //设置相机显示的方向    private void setCameraDisplayOrientation(Activity activity, int cameraId, Camera camera) {        Camera.CameraInfo info = new Camera.CameraInfo();        Camera.getCameraInfo(cameraId, info);        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();        int degrees = 0;        switch (rotation) {            case Surface.ROTATION_0:                degrees = 0;                break;            case Surface.ROTATION_90:                degrees = 90;                break;            case Surface.ROTATION_180:                degrees = 180;                break;            case Surface.ROTATION_270:                degrees = 270;                break;        }        int result;        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {            result = (info.orientation + degrees) % 360;            result = (360 - result) % 360;        } else {            // back-facing            result = (info.orientation - degrees + 360) % 360;        }        Log.i(TAG, "curDegree: " + result);        camera.setDisplayOrientation(result);    }    private void SetCameraFPS(Camera.Parameters parameters) {        if (parameters == null) {            return;        }        int[] findRange = null;        int defFPS = 20 * 1000;        List fpsList = parameters.getSupportedPreviewFpsRange();        if (fpsList != null && fpsList.size() > 0) {            for (int i = 0; i < fpsList.size(); ++i) {                int[] range = fpsList.get(i);                if (range != null                        && Camera.Parameters.PREVIEW_FPS_MIN_INDEX < range.length                        && Camera.Parameters.PREVIEW_FPS_MAX_INDEX < range.length) {                    Log.i(TAG, "Camera index:" + i + " support min fps:" + range[Camera.Parameters.PREVIEW_FPS_MIN_INDEX]);                    if (findRange == null) {                        if (defFPS <= range[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]) {                            findRange = range;                            Log.i(TAG, "Camera found appropriate fps, min fps:" + range[Camera.Parameters.PREVIEW_FPS_MIN_INDEX]                                    + " ,max fps:" + range[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);                        }                    }                }            }        }        if (findRange != null) {            parameters.setPreviewFpsRange(findRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX], findRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);        }    }    @Override    public void onPreviewFrame(byte[] data, Camera camera) {        frameCount++;        if (frameCount % 3000 == 0) {            Log.i("OnPre", "gc+");            System.gc();            Log.i("OnPre", "gc-");        }        if (data == null) {            Camera.Parameters params = camera.getParameters();            Camera.Size size = params.getPreviewSize();            int bufferSize = (((size.width | 0x1f) + 1) * size.height * ImageFormat.getBitsPerPixel(params.getPreviewFormat())) / 8;            camera.addCallbackBuffer(new byte[bufferSize]);        } else {            camera.addCallbackBuffer(data);        }    }    /**     * 处理音量变化时的界面显示     *     * @author long     */    private class MyVolumeReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            if (intent.getAction().equals("android.media.VOLUME_CHANGED_ACTION")) {                if (getCurrentVolume() == 0) {                    voiceIV.setBackgroundResource(R.drawable.surveillance_record_mute);                } else {                    voiceIV.setBackgroundResource(R.drawable.surveillance_record_voice);                }            }        }    }    @Override    protected void onResume() {        super.onResume();    }    @Override    protected void onStop() {        super.onStop();    }    /* 创建保存录制得到的视频文件     *     * @return     * @throws IOException     */    private File createMediaFile() throws IOException {        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(                    Environment.DIRECTORY_MOVIES), "CameraDemo");            if (!mediaStorageDir.exists()) {                if (!mediaStorageDir.mkdirs()) {                    Log.d(TAG, "failed to create directory");                    return null;                }            }            // Create an image file name            String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());            String imageFileName = "VID_" + timeStamp;            String suffix = ".mp4";            File mediaFile = new File(mediaStorageDir + File.separator + imageFileName + suffix);            return mediaFile;        } else {            // 当前不可用        }        return null;    }    //设置聚焦    private void doAutoFocus() {        parameters = mCamera.getParameters();        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);        mCamera.setParameters(parameters);        mCamera.autoFocus(new Camera.AutoFocusCallback() {            @Override            public void onAutoFocus(boolean success, Camera camera) {                if (success) {                    camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。                    if (!Build.MODEL.equals("KORIDY H30")) {                        parameters = camera.getParameters();                        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 连续自动对焦                        camera.setParameters(parameters);                    } else {                        parameters = camera.getParameters();                        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);                        camera.setParameters(parameters);                    }                }            }        });    }}

里面引用的库不必关心，参考里面摄像头部分的流程和逻辑即可。

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