打开相机和相册，使用retrofit上传文件

Post请求

@Multipart
   @POST(\"file/upload\")
   Observable<Bean> upload(@Query(\"uid\")int uid, @Part MultipartBody.Part file);

    private ImageView imageview;
    private static final int CAMERA_CODE = 1;
    private static final int GALLERY_CODE = 2;
    private static final int CROP_CODE = 3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        imageview = (ImageView) findViewById(R.id.imageview);
        imageview.set Listener(new View. Listener() {
            @Override
            public void  (View view) {
                View view1 = View.inflate(getApplicationContext(), R.layout.pip, null);
                //创建PopupWindow
                PopupWindow window = new PopupWindow(view1, 1000, 300, true);
                //配置PopupWindow
                window.setBackgroundDrawable(new ColorDrawable());
                window.setOutsideTouchable(true);
                window.setTouchable(true);
                window.showAsDropDown(imageview);
                Button xiangji = view1.findViewById(R.id.xiangji);
                Button xiangce = view1.findViewById(R.id.xiangce);
                xiangji.set Listener(new View. Listener() {
                    @Override
                    public void  (View view) {
                        chooseFromCamera();
                    }
                });
                xiangce.set Listener(new View. Listener() {
                    @Override
                    public void  (View view) {
                        chooseFromGallery();
                    }
                });
            }
        });
    }
    /**
     * 拍照选择图片
     */
    private void chooseFromCamera() {
        //构建隐式Intent
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        //调用系统相机
        startActivityForResult(intent, CAMERA_CODE);
    }

    /**
     * 从相册选择图片
     */
    private void chooseFromGallery() {
        //构建一个内容选择的Intent
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        //设置选择类型为图片类型
        intent.setType(\"image/*\");
        //打开图片选择
        startActivityForResult(intent, GALLERY_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode){
            case CAMERA_CODE:
                if (resultCode == RESULT_CANCELED) {
                    Toast.makeText(this, \"取消了拍照\", Toast.LENGTH_LONG).show();
                    return;
                }
                if(data != null){
                    Bitmap photo = data.getParcelableExtra(\"data\");
                    //将Bitmap转化为uri
                    Uri uri = saveBitmap(photo, \"temp\");
                    //启动图像裁剪
                    startImageZoom(uri);
                }
                break;
            case GALLERY_CODE:
                if (data == null){
                    return;
                }else{
                    //用户从图库选择图片后会返回所选图片的Uri
                    Uri uri;
                    //获取到用户所选图片的Uri
                    uri = data.getData();
                    //返回的Uri为content类型的Uri,不能进行复制等操作,需要转换为文件Uri
                    uri = convertUri(uri);
                    startImageZoom(uri);
                }
                break;
            case CROP_CODE:
                if (data == null){
                    return;
                }else{
                    Bundle extras = data.getExtras();
                    if (extras != null){
                        //获取到裁剪后的图像
                        Bitmap bm = extras.getParcelable(\"data\");
                        File filea = getFile(bm);
                        //mImageView.setImageBitmap(bm);
                        imageview.setImageBitmap(bm);
                        //设置图片格式
                        RequestBody requestFile = RequestBody.create(MediaType.parse(\"image/jpg\"), filea);
                        //设置一个file文件
                        MultipartBody.Part body = MultipartBody.Part.createFormData(\"file\", filea.getName(), requestFile);
                        //上传一个file文件
                        Observable<Bean> upload = RetrofitUtil.getInstance().create(MyInt.class).upload(71, body);
                        upload.subscribeOn(Schedulers.io())
                                .observeOn(AndroidSchedulers.mainThread())
                                .subscribe(new Observer<Bean>() {
                                    @Override
                                    public void onSubscribe(Disposable d) {

                                    }

                                    @Override
                                    public void onNext(Bean bean) {
                                        Toast.makeText(MainActivity.this,bean.getMsg(),Toast.LENGTH_SHORT).show();
                                    }

                                    @Override
                                    public void  (Throwable e) {

                                    }

                                    @Override
                                    public void onComplete() {

                                    }
                                });
                    }
                }
                break;
            default:
                break;
        }
    }
    /**
     * 将content类型的Uri转化为文件类型的Uri
     * @param uri
     * @return
     */
    private Uri convertUri(Uri uri){
        InputStream is;
        try {
            //Uri ----> InputStream
            is = getContentResolver().openInputStream(uri);
            //InputStream ----> Bitmap
            Bitmap bm = BitmapFactory.decodeStream(is);
            //关闭流
            is.close();
            return saveBitmap(bm, \"temp\");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 将Bitmap写入SD卡中的一个文件中,并返回写入文件的Uri
     * @param bm
     * @param dirPath
     * @return
     */
    private Uri saveBitmap(Bitmap bm, String dirPath) {
        //新建文件夹用于存放裁剪后的图片
        File tmpDir = new File(Environment.getExternalStorageDirectory() + \"/\" + dirPath);
        if (!tmpDir.exists()){
            tmpDir.mkdir();
        }

        //新建文件存储裁剪后的图片
        File img = new File(tmpDir.getAbsolutePath() + \"/avator.png\");
        try {
            //打开文件输出流
            FileOutputStream fos = new FileOutputStream(img);
            //将bitmap压缩后写入输出流(参数依次为图片格式、图片质量和输出流)
            bm.compress(Bitmap.CompressFormat.PNG, 85, fos);
            //刷新输出流
            fos.flush();
            //关闭输出流
            fos.close();
            //返回File类型的Uri
            return Uri.fromFile(img);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

    }

    /**
     * 通过Uri传递图像信息以供裁剪
     * @param uri
     */
    private void startImageZoom(Uri uri){
        //构建隐式Intent来启动裁剪程序
        Intent intent = new Intent(\"com.android.camera.action.CROP\");
        //设置数据uri和类型为图片类型
        intent.setDataAndType(uri, \"image/*\");
        //显示View为可裁剪的
        intent.putExtra(\"crop\", true);
        //裁剪的宽高的比例为1:1
        intent.putExtra(\"aspectX\", 1);
        intent.putExtra(\"aspectY\", 1);
        //输出图片的宽高均为150
        intent.putExtra(\"outputX\", 150);
        intent.putExtra(\"outputY\", 150);
        //裁剪之后的数据是通过Intent返回
        intent.putExtra(\"return-data\", true);
        startActivityForResult(intent, CROP_CODE);
    }
    public File getFile(Bitmap bmp) {
        String defaultPath = getApplicationContext().getFilesDir()
                .getAbsolutePath() + \"/defaultGoodInfo\";
        File file = new File(defaultPath);
        if (!file.exists()) {
            file.mkdirs();
        }
        String defaultImgPath = defaultPath + \"/messageImg.jpg\";
        file = new File(defaultImgPath);
        try {
            file.createNewFile();
            FileOutputStream fOut = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.PNG, 20, fOut);
            fOut.flush();
            fOut.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return file;
    }
}

给自己看的。。。