第一步：build.gradle中添加依赖

compile 'com.foamtrace:photopicker:1.0'

第二步：配置信息

1.清单文件中添加权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2.清单文件中添加activity

<activity
            android:name="com.foamtrace.photopicker.PhotoPickerActivity"
            android:theme="@style/PhotoPickerTheme"
            android:configChanges="orientation|screenSize"/>
        <activity android:name="com.foamtrace.photopicker.PhotoPreviewActivity"
            android:theme="@style/PhotoPickerTheme"/>

3.style.xml添加

<style name="ActionMenuTextStyle" parent="TextAppearance.AppCompat.Widget.ActionBar.Menu">
        <item name="android:textSize">@dimen/action_text_size</item>
        <item name="android:textStyle">normal</item>
    </style>
    <style name="actionBarTheme" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
    </style>

    <style name="actionBarPopupTheme" parent="ThemeOverlay.AppCompat.Light">
    </style>

    <style name="PhotoPickerTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
        <item name="android:windowBackground">@color/photopicker_background</item>
        <item name="actionMenuTextAppearance">@style/ActionMenuTextStyle</item>
        <!--<item name="actionBarTheme">@style/actionBarTheme</item>-->
        <!--<item name="actionBarPopupTheme">@style/actionBarPopupTheme</item>-->
    </style>

4.colors.xml添加

<color name="photopicker_background">#181819</color>

第三步：MainActivity实现代码

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.foamtrace.photopicker.ImageCaptureManager;
import com.foamtrace.photopicker.PhotoPickerActivity;
import com.foamtrace.photopicker.PhotoPreviewActivity;
import com.foamtrace.photopicker.SelectModel;
import com.foamtrace.photopicker.intent.PhotoPickerIntent;
import com.foamtrace.photopicker.intent.PhotoPreviewIntent;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private int columnWidth;
    private ArrayList<String> imagePaths = null;
    private GridAdapter gridAdapter;
    private GridView gv;
    private ImageCaptureManager captureManager; // 相机拍照处理类
    private static final int REQUEST_CAMERA_CODE = 11;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button danxuan = (Button) findViewById(R.id.danxuan);
        Button duoxuan = (Button) findViewById(R.id.duoxuan);
        Button paizhao = (Button) findViewById(R.id.paizhao);
        gv = (GridView) findViewById(R.id.gv);


        //得到GridView中每个ImageView宽高
        int cols = getResources().getDisplayMetrics().widthPixels / getResources().getDisplayMetrics().densityDpi;
        cols = cols < 3 ? 3 : cols;
        gv.setNumColumns(cols);
        int screenWidth = getResources().getDisplayMetrics().widthPixels;
        int columnSpace = getResources().getDimensionPixelOffset(R.dimen.space_size);
        columnWidth = (screenWidth - columnSpace * (cols-1)) / cols;


        danxuan.setOnClickListener(this);
        duoxuan.setOnClickListener(this);
        paizhao.setOnClickListener(this);
        //GridView item点击事件（浏览照片）
        gv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                PhotoPreviewIntent intent = new PhotoPreviewIntent(MainActivity.this);
                intent.setCurrentItem(position);
                intent.setPhotoPaths(imagePaths);
                startActivityForResult(intent, 22);
            }
        });
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            //单选图片
            case R.id.danxuan:
                PhotoPickerIntent intent = new PhotoPickerIntent(MainActivity.this);
                intent.setSelectModel(SelectModel.SINGLE);
                intent.setShowCarema(true);
                startActivityForResult(intent, REQUEST_CAMERA_CODE);
                break;
            //多选图片
            case R.id.duoxuan:
                PhotoPickerIntent intent1 = new PhotoPickerIntent(MainActivity.this);
                intent1.setSelectModel(SelectModel.MULTI);
                intent1.setShowCarema(true); // 是否显示拍照
                intent1.setMaxTotal(9); // 最多选择照片数量，默认为9
                intent1.setSelectedPaths(imagePaths); // 已选中的照片地址， 用于回显选中状态
                startActivityForResult(intent1, REQUEST_CAMERA_CODE);
                break;
            //拍照
            case R.id.paizhao:
                try {
                    if(captureManager == null){
                        captureManager = new ImageCaptureManager(MainActivity.this);
                    }
                    Intent intent3 = captureManager.dispatchTakePictureIntent();
                    startActivityForResult(intent3, ImageCaptureManager.REQUEST_TAKE_PHOTO);
                } catch (IOException e) {
                    Toast.makeText(MainActivity.this, com.foamtrace.photopicker.R.string.msg_no_camera, Toast.LENGTH_SHORT).show();
                    e.printStackTrace();
                }
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode==RESULT_OK){
            switch (requestCode){
                // 选择照片
                case REQUEST_CAMERA_CODE:
                    loadAdpater(data.getStringArrayListExtra(PhotoPickerActivity.EXTRA_RESULT));
                    break;
                //浏览照片
                case 22:
                    loadAdpater(data.getStringArrayListExtra(PhotoPreviewActivity.EXTRA_RESULT));
                    break;
                // 调用相机拍照
                case ImageCaptureManager.REQUEST_TAKE_PHOTO:
                    if(captureManager.getCurrentPhotoPath() != null) {
                        captureManager.galleryAddPic();

                        ArrayList<String> paths = new ArrayList<>();
                        paths.add(captureManager.getCurrentPhotoPath());
                        loadAdpater(paths);
                    }
                    break;
            }
        }
    }

    private void loadAdpater(ArrayList<String> paths){
        if(imagePaths == null){
            imagePaths = new ArrayList<>();
        }
        imagePaths.clear();
        imagePaths.addAll(paths);
        if(gridAdapter == null){
            gridAdapter = new GridAdapter(imagePaths);
            gv.setAdapter(gridAdapter);
        }else {
            gridAdapter.notifyDataSetChanged();
        }
    }
    private class GridAdapter extends BaseAdapter {
        private ArrayList<String> listUrls;

        public GridAdapter(ArrayList<String> listUrls) {
            this.listUrls = listUrls;
        }

        @Override
        public int getCount() {
            return listUrls.size();
        }

        @Override
        public String getItem(int position) {
            return listUrls.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;
            if(convertView == null){
                convertView = getLayoutInflater().inflate(R.layout.item_image, null);
                imageView = (ImageView) convertView.findViewById(R.id.imageView);
                convertView.setTag(imageView);
                // 重置ImageView宽高
                LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(columnWidth, columnWidth);
                imageView.setLayoutParams(params);
            }else {
                imageView = (ImageView) convertView.getTag();
            }
            //框架里自带glide
            Glide.with(MainActivity.this)
                    .load(new File(getItem(position)))
                    .placeholder(R.mipmap.default_error)
                    .error(R.mipmap.default_error)
                    .centerCrop()
                    .crossFade()
                    .into(imageView);
            return convertView;
        }
    }

}

源码下载：
https://github.com/a2978157/MyPhotoPicker