Android自定义相机,切换前后摄像头,照相机拍照

Android自定义相机,简单实现切换前后摄像头,照相机拍照

Ctrl +C Ctrl+V 可以直接 run 起来,注释比较详细;源码下载

<?xml version="1.0" encoding="utf-8"?>

android6.0及以上需要动态申请相机权限:

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 1);        }

package com.tomorrow_p.camera_p;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.Surface;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.Toast;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;public class MainActivity extends Activity {    private static final String TAG = "ansen";    private View mRelativeLayout;    private Camera mCamera;    private Camera.Parameters mParameters = null;    private int cameraPosition = 1;//0代表前置摄像头，1代表后置摄像头    private SurfaceHolder mHolder;    Bundle bundle = null; // 声明一个Bundle对象，用来存储数据    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        requestWindowFeature(Window.FEATURE_NO_TITLE);//没有标题//        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏//        this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//拍照过程屏幕一直处于高亮        setContentView(R.layout.activity_main);        mRelativeLayout = findViewById(R.id.relativeLayout);        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.surfaceView);        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        surfaceView.getHolder().setFixedSize(176, 144); //设置Surface分辨率        surfaceView.getHolder().setKeepScreenOn(true);// 屏幕常亮        surfaceView.getHolder().addCallback(new SurfaceCallback());//为SurfaceView的句柄添加一个回调函数    }    public void takePhoto(View v) {        if (mCamera != null) {            // 获取到拍照的图片数据后回调PictureCallback,PictureCallback可以对相片进行保存或传入网络            mCamera.takePicture(null, null, new MyPictureCallback());        }    }    public void change(View v) {        //切换前后摄像头        int cameraCount = 0;        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();        cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数        for (int i = 0; i < cameraCount; i++) {            Camera.getCameraInfo(i, cameraInfo);//得到每一个摄像头的信息            if (cameraPosition == 1) {                //现在是后置，变更为前置                if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {//代表摄像头的方位，CAMERA_FACING_FRONT前置      CAMERA_FACING_BACK后置                    mCamera.stopPreview();//停掉原来摄像头的预览                    mCamera.release();//释放资源                    mCamera = null;//取消原来摄像头                    mCamera = Camera.open(i);//打开当前选中的摄像头                    try {                        mCamera.setPreviewDisplay(mHolder);//通过surfaceview显示取景画面                    } catch (IOException e) {                        e.printStackTrace();                    }                    mCamera.startPreview();//开始预览                    cameraPosition = 0;                    break;                }            } else {                //现在是前置， 变更为后置                if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {//代表摄像头的方位，CAMERA_FACING_FRONT前置      CAMERA_FACING_BACK后置                    mCamera.stopPreview();//停掉原来摄像头的预览                    mCamera.release();//释放资源                    mCamera = null;//取消原来摄像头                    mCamera = Camera.open(i);//打开当前选中的摄像头                    try {                        mCamera.setPreviewDisplay(mHolder);//通过surfaceview显示取景画面                    } catch (IOException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                    mCamera.startPreview();//开始预览                    cameraPosition = 1;                    break;                }            }        }    }    /**     * 图片被点击触发的时间     *     * @param v     */    public void imageClick(View v) {        if (bundle == null) {            Toast.makeText(getApplicationContext(), "没有数据", Toast.LENGTH_SHORT).show();        } else {            Intent intent = new Intent(this, PreviewImageActivity.class);            intent.putExtras(bundle);            startActivity(intent);        }    }    private final class MyPictureCallback implements Camera.PictureCallback {        @Override        public void onPictureTaken(byte[] data, Camera camera) {            try {                bundle = new Bundle();                bundle.putByteArray("bytes", data); //将图片字节数据保存在bundle当中，实现数据交换                saveToSDCard(data); // 保存图片到sd卡中                Toast.makeText(getApplicationContext(), "success", Toast.LENGTH_SHORT).show();//                camera.startPreview(); // 拍完照后，重新开始预览            } catch (Exception e) {                e.printStackTrace();            }        }    }    public void saveToSDCard(byte[] data) throws IOException {        Log.d(TAG, "saveToSDCard");        Date date = new Date();        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 格式化时间        String filename = format.format(date) + ".jpg";        File fileFolder = new File(Environment.getExternalStorageDirectory() + "/ansen/");// Environment.getRootDirectory()        if (!fileFolder.exists()) {            fileFolder.mkdir();        }        File jpgFile = new File(fileFolder, filename);        FileOutputStream outputStream = new FileOutputStream(jpgFile); // 文件输出流        outputStream.write(data);        outputStream.close();        mCamera.startPreview(); // 拍完照后，重新开始预览        if (false) {            Bitmap b = byteToBitmap(data);            // 获取手机屏幕的宽高            WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);            int windowWidth = windowManager.getDefaultDisplay().getWidth();            int windowHight = windowManager.getDefaultDisplay().getHeight();            Bitmap bitmap = Bitmap.createBitmap(b, 0, 0, windowWidth, windowHight);            // 图片压缩            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);            outputStream.flush();        }    }    /**     * 把图片byte流转换成bitmap     */    private Bitmap byteToBitmap(byte[] data) {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        Bitmap b = BitmapFactory.decodeByteArray(data, 0, data.length, options);        int i = 0;        while (true) {            if ((options.outWidth >> i <= 1000)                    && (options.outHeight >> i <= 1000)) {                options.inSampleSize = (int) Math.pow(2.0D, i);                options.inJustDecodeBounds = false;                b = BitmapFactory.decodeByteArray(data, 0, data.length, options);                break;            }            i += 1;        }        return b;    }    /**     * 显示surfaceView 数据的接口     */    private class SurfaceCallback implements SurfaceHolder.Callback {        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                                   int height) {            Log.d(TAG, "surfaceChanged");            mParameters = mCamera.getParameters(); // 获取各项参数            mParameters.setPictureFormat(PixelFormat.JPEG); // 设置图片格式            mParameters.setPreviewSize(width, height); // 设置预览大小            mParameters.setPreviewFrameRate(5);  //设置每秒显示4帧            mParameters.setPictureSize(width, height); // 设置保存的图片尺寸            mParameters.setJpegQuality(80); // 设置照片质量        }        @Override        public void surfaceCreated(SurfaceHolder holder) {            Log.d(TAG, "surfaceCreated");            mHolder = holder;// SurfaceHolder是系统提供用来设置surfaceView的对象            try {                mCamera = Camera.open(); // 打开摄像头                mCamera.setPreviewDisplay(holder); //通过surfaceview显示取景画面                mCamera.setDisplayOrientation(getPreviewDegree(MainActivity.this));// 设置相机的方向                mCamera.startPreview(); // 开始预览            } catch (Exception e) {                e.printStackTrace();                Log.e(TAG, "surfaceCreated >>  Exception: " + e.getMessage());            }        }        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            Log.d(TAG, "surfaceDestroyed");            if (mCamera != null) {                mCamera.release(); // 释放照相机                mCamera = null;            }        }    }    /**     * 点击手机屏幕是，显示两个按钮     */    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                mRelativeLayout.setVisibility(ViewGroup.VISIBLE); // 设置视图可见                break;        }        return true;    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        switch (keyCode) {            case KeyEvent.KEYCODE_CAMERA:                if (mCamera != null && event.getRepeatCount() == 0) {                    // 获取到拍照的图片数据后回调PictureCallback,PictureCallback可以对相片进行保存或传入网络                    mCamera.takePicture(null, null, new MyPictureCallback());                }        }        return super.onKeyDown(keyCode, event);    }    // 用于根据手机方向获得相机预览画面旋转的角度    public static int getPreviewDegree(Activity activity) {        int degree = 0;        // 获得手机的方向        int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();        Log.d(TAG, "rotation : " + rotation);        // 根据手机的方向计算相机预览画面应该选择的角度        switch (rotation) {            case Surface.ROTATION_0:                degree = 90;                break;            case Surface.ROTATION_90:                degree = 0;                break;            case Surface.ROTATION_180:                degree = 270;                break;            case Surface.ROTATION_270:                degree = 180;                break;        }        return degree;    }}

<?xml version="1.0" encoding="utf-8"?>

package com.tomorrow_p.camera_p;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.os.Bundle;import android.widget.ImageView;public class PreviewImageActivity extends Activity {    private ImageView ivPic = null; // 显示图片控件    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.preview_image);        ivPic = (ImageView) findViewById(R.id.imageView);        setImageBitmap(getImageFormBundle());    }    public void setImageBitmap(byte[] bytes) {        Bitmap cameraBitmap = byte2Bitmap();        // 根据拍摄的方向旋转图像（纵向拍摄时要需要将图像选择90度)        Matrix matrix = new Matrix();        matrix.setRotate(MainActivity.getPreviewDegree(this));        cameraBitmap = Bitmap                .createBitmap(cameraBitmap, 0, 0, cameraBitmap.getWidth(),                        cameraBitmap.getHeight(), matrix, true);        ivPic.setImageBitmap(cameraBitmap);    }    public byte[] getImageFormBundle() {        Intent intent = getIntent();        Bundle data = intent.getExtras();        byte[] bytes = data.getByteArray("bytes");        return bytes;    }    /**     * 将字节数组的图形数据转换为Bitmap     */    private Bitmap byte2Bitmap() {        byte[] data = getImageFormBundle();        // 将byte数组转换成Bitmap对象        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);        return bitmap;    }}

更多相关文章

随机推荐