android 使用相机拍照，并存储到手机sd卡上，并利用系统录像录像并播放

//首先声明一个成员变量 String savePath,用来储存文件路径
    /**
     * 保存照片路径
     * @return 返回图片的一个文件
     * @throws IOException 抛出一个异常
     */
    private File createSavePath() throws IOException{
        String saveFormat = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + saveFormat + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(imageFileName,".jpg",storageDir);
        savePath = image.getAbsolutePath();
        //将照片添加到相册中以便其他应用查看
        galleryAddPic();
        return  image;
    }

 /**
     * 将照片添加到相册中
     */
    private void galleryAddPic() {
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(savePath);
        Uri contentUri = Uri.fromFile(f);
        intent.setData(contentUri);
        this.sendBroadcast(intent);
    }

 /**
     * 解码一幅缩放图片，放到imageview中
     */
    private void setPic() {
        // 得到imgeView这个控件的尺寸
        int targetW = imageView.getWidth();
        int targetH = imageView.getHeight();

        // 得到这个位图的尺寸
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(savePath, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;
        // 确定图片的缩减比例
        int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

        // 解码图像文件到一个位图的大小来填充视图
        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor - 1;//这里我用的减1 ，因为在运行过程中程Bitmap too large to be uploaded into a texture (3120x4160, max=4096x4096) 就只能相对减少一个比例
        bmOptions.inPurgeable = true;

        Bitmap bitmap = BitmapFactory.decodeFile(savePath, bmOptions);
        imageView.setImageBitmap(bitmap);
    }

最后调用，启动相机拍照

private void startActivity(){
        //启动相机并给新照片创建文件对象
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        //在调用activity的时候首先调用resolveActivity（），判断调用的activity有没有执行这个的能力
        if (intent.resolveActivity(getPackageManager()) != null) {
            File file = null;
            try {
                file = createSavePath();
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(),"IO异常错误！",Toast.LENGTH_LONG).show();
            }
            if (file != null){
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
                startActivityForResult(intent,REQUESTCODE);
            }
        }
    }

最后一步，在相机返回的时候用解码的位图显示到imageview中

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //首先判断返回是否成功
        if (requestCode == REQUESTCODE && resultCode == RESULTCODE){
            //解码图片放到imageview中
              setPic();
        }
    }

简单的拍照就完成了。

录像并播放

跳转到录像：

Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
                if (intent.resolveActivity(getPackageManager()) != null){
                    startActivityForResult(intent,REQUESTCODE_VIDEO);
                }

和拍照类似

if (requestCode == REQUESTCODE_VIDEO && resultCode == RESULTCODE){
                //得到录制视频的uri
                Uri uri = data.getData();
                imageView.setVisibility(View.GONE);
                videoView.setVisibility(View.VISIBLE);
                //将uri设置到videoview中
                videoView.setVideoURI(uri);
                //实例化一个控制
                mediaco = new MediaController(TakePicture.this);
                videoView.setMediaController(mediaco);
                mediaco.setMediaPlayer(videoView);
                videoView.requestFocus();
        }

在onActivityResult中实现即可。