Android怎么自定義Camera實現拍照小功能

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首先實現一個自定義拍照功能。

自定義布局

<FrameLayout
        android:layout_below="@id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <SurfaceView
            android:id="@+id/surface"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:keepScreenOn="true"/>
    </FrameLayout>

初始化控件：

surfaceView = (SurfaceView) findViewById(R.id.surface);
holder = surfaceView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

btn.setOnCLickListener(new OnClickLister(View v){
    if(mCamera == null){
        mCamera = Camera.open();
    }
mCamera.takePicture(null,null,this);
});

 @Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
      initStartCamera(surfaceHolder);
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
          mCamera.autoFocus(new Camera.AutoFocusCallback() {
            @Override
            public void onAutoFocus(boolean success, Camera camera) {
                isAutoFocus = success;
                initCameraParams();
                mCamera.cancelAutoFocus();
                mCamera.startPreview();
            }
        });
}

@Override
   public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
       // 當holder被回收時 釋放硬件
       //   releaseCamera();
   }

     @Override
    protected void onPause() {
        super.onPause();
        releaseCameraSource();
    }

  @Override
    protected void onResume() {
        super.onResume();
        // TODO:  看看退出到其他頁面是否有黑屏現象
        if (surfaceView != null) {
            surfaceView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    initCameraParams();
                }
            }, 50);
        }
    }

  private void initStartCamera(SurfaceHolder surfaceHolder) {
        try {
            mCamera = Camera.open();
            mCamera.setDisplayOrientation(90);
            mCamera.setPreviewDisplay(surfaceHolder);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

private void initCameraParams() {
        if (mCamera != null) {
            Camera.Parameters parameters = mCamera.getParameters();
            parameters.setPictureFormat(ImageFormat.JPEG);
            parameters.setJpegQuality(90);
            List<Camera.Size> supportedPictureSizes = parameters.getSupportedPictureSizes();

            WindowManager manager = (WindowManager) getSystemService(WINDOW_SERVICE);
            Display display = manager.getDefaultDisplay();
            Point point = new Point();
            display.getSize(point);

            int screenWidth = point.x;
            int screenHeight = point.y;

            // 找到適合的圖片的尺寸
            if (supportedPictureSizes != null && !supportedPictureSizes.isEmpty()) {
                int screenSize = screenHeight * screenWidth;
                Camera.Size picSize = null;
                for (Camera.Size size : supportedPictureSizes) {
                    int value = size.height * size.width;
                    if (value <= screenSize) {
                        if (picSize == null) {
                            picSize = size;
                        } else {
                            // 取最接近屏幕尺寸的
                            if (value > picSize.width * picSize.height) {
                                picSize = size;
                            }
                        }
                    }
                }
                if (picSize == null) {
                    picSize = supportedPictureSizes.get(0);
                }
                parameters.setPictureSize(picSize.width, picSize.height);
            }

            // 設置對焦模式
            List<String> supportedFocusModes = parameters.getSupportedFocusModes();
            if (supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
                // 快速對焦
                parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
            } else {
                parameters.setFocusMode(Camera.Parameters.FLASH_MODE_AUTO);
            }
            try {
                mCamera.setParameters(parameters);
                mCamera.startPreview();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

 private void releaseCameraSource() {
        if (mCamera != null) {
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        }
    }

調用相機的拍攝功能：

點擊拍照調用camera.takePicture(null,null,this);

獲取拍照回調回來的圖片數據

public void onPictureTaken(final byte[] bytes,final Camera camera){
   // 拍照回掉回來的 圖片數據。
        final String filePath = Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/";
        final String picturePath = System.currentTimeMillis() + ".jpg";
        final File file = new File(filePath, picturePath);
        new Thread(new Runnable() {
            @Override
            public void run() {
                Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                bitmap = rotateBitmapByDegree(bitmap, 90);
                BufferedOutputStream bos = null;
                try {
                //防止拍照保存圖片被壓縮
                    bos = new BufferedOutputStream(new FileOutputStream(file));
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
                    bos.flush();
                    bos.close();
                    bitmap.recycle();

                    Intent intent = new Intent(TakePhotoActivity.this,TPreViewPicActivity.class);
                    intent.putExtra("filePath",filePath);
                    intent.putExtra("picturePath",picturePath);
                    startActivityForResult(intent,102);
                } catch (FileNotFoundException e1) {
                    e1.printStackTrace();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }).start();
}

接下來要說的就是我們上面說到的保存圖片被旋轉的問題：

public Bitmap rotateBitmapByDegree(Bitmap bm,int degree){
  Bitmap bitmap ;
  Matrix matrix = new Matrix();
  matrix.postRotate(degree);
  try{
  bitmap  = Bitmap.createBitmap(bm,0,bm.getWidth,bm.getHeight,matrix,true);
}catch(OutOfMemoryError e){
  e.printStackTrace();
}

if(bitmap == null){
bitmap = bm;
}
if(bm != bitmap){
 bm.recycle();
}
return bitmap;
}

@Override
public void onPause(){
super.onPause();
if(camera != null){
    if(isPrevew){
        camera.stopPreview();
        camera.release();
        camera= null;
        isPreView= false;
    }
 }
}

@Override
    protected void onResume() {
        super.onResume();
        openCamera();
    }

*#額外要說明的是，android 6.0權限問題，可能會導致首次進入拍照界面黑屏，解決方案在拍照界面之前請求權限；

最后附上請求權限代碼：

public void checkPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.CAMERA}
                    , new TCallPhoneTool.PermissionListener() {
                        @Override
                        public void onGranted() {
//                            openCamera();
                        }

                        @Override
                        public void onRefused(List<String> deniedPermissions) {
                            showMissingPermissionDialog();
                        }
                    });
        } else {
//            openCamera();
        }
    }

  TCallPhoneTool.PermissionListener mListener ;
    final int REQUEST_CODE_STORAGE = 131;
    public void requestPermissions(String[] permissions, TCallPhoneTool.PermissionListener listener) {
        List<String> deniedPermissions = new ArrayList<>() ;
        mListener = listener ;

        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(this,permission) == PackageManager.PERMISSION_DENIED) {
                deniedPermissions.add(permission);
            }
        }
        if (deniedPermissions.size() > 0) {
            ActivityCompat.requestPermissions(this,deniedPermissions.toArray(new String[deniedPermissions.size()]),REQUEST_CODE_STORAGE);
        } else {
            mListener.onGranted();
        }
    }

   public void showMissingPermissionDialog() {
        android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(this);
        builder.setTitle(getString(com.to8to.baselib.R.string.tip_permision_miss));
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
            }
        });

        builder.setPositiveButton("設置", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                startAppSetting();
            }
        });
        builder.setCancelable(false);
        builder.show();

   public void startAppSetting() {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse("package:" + this.getPackageName()));
        startActivity(intent);
    }

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