Android相册如何读取手机中的图片？

效果图：

1、实体类Photo.ajva

public class Photo {
    private String name;//名称
    private String date;//日期
    private long size;  //大小
    private String path;//路径
    /**
     * 构造函数
     */
    public Photo() {
    }
    public Photo(String name, String date, long size, String path) {
        this.name = name;
        this.date = date;
        this.size = size;
        this.path = path;
    }
}

2、在AndroidManifest.xml里添加权限

    <!-- 读写权限 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

3、Activity活动里读取手机中的图片

    private void initData() {
        //读取手机中的相片
        Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
         List<Photo> mPhotoList= new ArrayList<Photo>();
        while (cursor.moveToNext()) {
            //获取图片的路径
            String path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            if(path!=null && path.length() >0) {
                //获取图片的名称
                String name = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));
                //获取图片最后修改的日期
                File file = new File(path);
                long modifieTime = file.lastModified();
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                String date = sdf.format(new Date(modifieTime));
                //获取图片的大小
                long size = cursor.getLong(cursor.getColumnIndex(MediaStore.Images.Media.SIZE));
                Photo photo = new Photo(name, date, size, path);
                mPhotoList.add(photo);
            }
        }
        mPhotoList = sortList(mPhotoList);
    }
   /**
     * List按照时间降序排列
     * @param L
     * @return
     */
    private List<Photo> sortList(List<Photo> L){
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        Photo temp = new Photo();
        //冒泡排序，大的时间在数组的前列
        for(int i=0; i<L.size()-1; i++){
            for(int j=i+1; j<L.size();j++){
                String date1=L.get(i).getDate();
                String date2=L.get(j).getDate();
                Date d1=sdf.parse(date1,new ParsePosition(0));
                Date d2=sdf.parse(date2,new ParsePosition(0));
                boolean flag = d1.before(d2);
                //flag=true为降序，flag=flase为升序
                if (flag){
                    temp = L.get(i);
                    L.set(i, L.get(j));
                    L.set(j, temp);
                }
             }
        }
        return L;
    }