Android开发片段–调用系统相机拍照

初始化相机

 

Java代码 

private void initCamera() {  

        setContentView(R.layout.main);  

        btnTake = (Button) this.findViewById(R.id.take);  

  

        btnTake.setOnClickListener(new OnClickListener() {  

            @Override  

            public void onClick(View v) {  

                camera.autoFocus(new AutoFocusCallback());  

            }  

        });  

        Display display = getWindowManager().getDefaultDisplay();  

        surfaceView = (SurfaceView) this.findViewById(R.id.mSurfaceView1);  

        surfaceView.getHolder().setFixedSize(display.getWidth(),  

                display.getHeight()); // 设置分辨率  

        /* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */  

        surfaceView.getHolder()  

                .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  

        surfaceView.getHolder().addCallback(new SurfaceCallback());  

    }  

 

回调函数类

 private final class SurfaceCallback implements SurfaceHolder.Callback {

Java代码 

@Override  

public void surfaceChanged(SurfaceHolder holder, int format, int width,  

        int height) {  

  

}  

  

@Override  

public void surfaceCreated(SurfaceHolder holder) {  

    try {  

        camera = Camera.open();  

        Camera.Parameters parameters = camera.getParameters();  

        // parameters.setPreviewSize(1024, 768);//设置预览照片的大小  

        // parameters.setPreviewFrameRate(3);//每秒3帧  

        parameters.setPictureFormat(PixelFormat.JPEG);// 设置照片的输出格式  

        parameters.set("jpeg-quality", quality);// 照片质量  

        parameters.setPictureSize(photoWidth, photoHeight);// 设置照片的大小  

        parameters.set("orientation", "landscape");  

        // parameters.set("orientation", "portrait");  

        // parameters.set("rientation", "90");  

        // camera.setDisplayOrientation(90);  

        // parameters.set("rotation", "180");  

        // parameters.set("orientation", "landscape");  

        parameters.setRotation(180);  

  

        camera.setParameters(parameters);  

        camera.setPreviewDisplay(surfaceView.getHolder());// 通过SurfaceView显示取景画面  

        camera.startPreview();// 开始预览  

        preview = true;  

    } catch (IOException e) {  

        Log.e(TAG, e.toString());  

    }  

  

}  

  

@Override  

public void surfaceDestroyed(SurfaceHolder holder) {  

    if (camera != null) {  

        if (preview)  

            camera.stopPreview();  

        camera.release();  

    }  

}  

 自动对焦

Java代码 

private final class AutoFocusCallback implements Camera.AutoFocusCallback {  

        @Override  

        public void onAutoFocus(boolean success, Camera camera) {  

            camera.takePicture(null, null, new TakePictureCallback());  

        }  

  

    }  

 拍照保存

Java代码 

private final class TakePictureCallback implements PictureCallback {  

        @Override  

        public void onPictureTaken(byte[] data, Camera camera) {  

            try {  

  

                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,  

                        data.length);  

                File file = new File(temPath);  

                FileOutputStream outStream = new FileOutputStream(file);  

  

                // Bitmap 旋转  

                Matrix vMatrix = new Matrix();  

                vMatrix.setRotate(270);  

  

                Bitmap vB2 = Bitmap.createBitmap(bitmap, 0, 0, bitmap  

                        .getWidth() // 宽度  

                        , bitmap.getHeight() // 高度  

                        , vMatrix, true);  

                vB2.compress(CompressFormat.JPEG, 100, outStream);  

                outStream.close();  

                camera.stopPreview();  

                // savePhoto();  

                setReview();  

            } catch (Exception e) {  

                Log.e(TAG, e.toString());  

            }  

        }  

    }