A.引入:

allprojects {
    repositories {
        ...
        maven { url 'https://www.jitpack.io' }
    }
}

dependencies {
    implementation 'com.github.Ct7Liang:ImageSelector:1.3'
}

B.权限配置(6.0以后注意运行时权限申请)

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

C.FileProvider配置

项目 -> res目录下 -> 新建xml文件夹 -> 创建"file_path.xml"文件(名称随意,与清单文件中保持一致即可)

//file_path.xml内容:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:tools="http://schemas.android.com/tools" tools:ignore="MissingDefaultResource">
    <external-path name="external_files" path="Ct7liang/img_select"/>
</paths>

清单文件中:

<application
    ...
    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="项目包名(appId)"
        android:grantUriPermissions="true"
        android:exported="false">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_path" />
    </provider>
    ...
</application>

D.使用

//创建PictureSelector对象
//Activity中使用
PictureSelector pictureSelector = new PictureSelector(Activity activity, "项目包名(appId)", 999);
//Fragment中使用
PictureSelector pictureSelector = new PictureSelector(Fragment fragment, "项目包名(appId)", 999);

//单选本地图片(是否需要裁剪)
pictureSelector.selectPhoto(boolean isCrop);
//多选本地图片(最大可选取数量)
pictureSelector.selectPhotos(int maxNum);
//拍照选择(是否需要裁剪)
pictureSelector.takePhoto(boolean isCrop);

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    //获取最后的图片(以图片绝对路径的集合的形式返回)
    if (pictureSelector!=null){
        ArrayList<String> images = pictureSelector.getImages(requestCode, data);
        Log.i("imgSelector", images.toString());
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    //页面关闭的时候,删除本地缓存目录(可选)
    if (pictureSelector!=null){
        pictureSelector.onDestroy();
    }
}