compile 'com.lzy.widget:imagepicker:0.5.4'  //指定版本

    public class PicassoImageLoader implements ImageLoader {
    
        @Override
        public void displayImage(Activity activity, String path, ImageView imageView, int width, int height) {
            Picasso.with(activity)//
                    .load(Uri.fromFile(new File(path)))//
                    .placeholder(R.mipmap.default_image)//
                    .error(R.mipmap.default_image)//
                    .resize(width, height)//
                    .centerInside()//
                    .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)//
                    .into(imageView);
        }
    
        @Override
        public void clearMemoryCache() {
            //这里是清除缓存的方法,根据需要自己实现
        }
    }

<activity
            android:name="com.lzy.imagepicker.ui.ImagePreviewDelActivity"
            android:theme="@style/ImagePickerThemeFullScreen"/>

	protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image_picker);

        ImagePicker imagePicker = ImagePicker.getInstance();
        imagePicker.setImageLoader(new PicassoImageLoader());   //设置图片加载器
		imagePicker.setShowCamera(true);  //显示拍照按钮
		imagePicker.setCrop(true);        //允许裁剪（单选才有效）
		imagePicker.setSaveRectangle(true); //是否按矩形区域保存
		imagePicker.setSelectLimit(9);    //选中数量限制
		imagePicker.setStyle(CropImageView.Style.RECTANGLE);  //裁剪框的形状
		imagePicker.setFocusWidth(800);   //裁剪框的宽度。单位像素（圆形自动取宽高最小值）
        imagePicker.setFocusHeight(800);  //裁剪框的高度。单位像素（圆形自动取宽高最小值）
		imagePicker.setOutPutX(1000);//保存文件的宽度。单位像素
        imagePicker.setOutPutY(1000);//保存文件的高度。单位像素
	}

	public void onClick(View v) {
            Intent intent = new Intent(this, ImageGridActivity.class);
            startActivityForResult(intent, IMAGE_PICKER);  
        }
    }

	Intent intent = new Intent(this, ImageGridActivity.class);
	intent.putExtra(ImageGridActivity.EXTRAS_TAKE_PICKERS,true); // 是否是直接打开相机
        startActivityForResult(intent, REQUEST_CODE_SELECT);

	@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == ImagePicker.RESULT_CODE_ITEMS) {
            if (data != null && requestCode == IMAGE_PICKER) {
                ArrayList<ImageItem> images = (ArrayList<ImageItem>) data.getSerializableExtra(ImagePicker.EXTRA_RESULT_ITEMS);
                MyAdapter adapter = new MyAdapter(images);
                gridView.setAdapter(adapter);
            } else {
                Toast.makeText(this, "没有数据", Toast.LENGTH_SHORT).show();
            }
        }
    }