忽然觉得不适合分享代码 看着很乱 所以我上博客分享了我的代码
首先记录一下写的比较好的二个
这个是调用PictureSelector 依赖来实现的 PictureSelector 主要是帮助多图选取的（简单）https://www.jianshu.com/p/48fd284b70a6
这个完全是自己实现的（困难） https://www.jianshu.com/p/fd61fce8a3ef
这个不知道好不好用https://www.cnblogs.com/zhangqie/p/6709179.html
https://cloud.tencent.com/developer/article/1331025
https://blog.csdn.net/qq_36416136/article/details/71552681
自己实现
主布局
android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/color_white"> android:id="@+id/include" layout="@layout/titles" /> android:id="@+id/tv_btn_logout" android:layout_width="match_parent" android:layout_height="54dp" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginLeft="22dp" android:layout_marginTop="10dp" android:layout_marginRight="20dp" android:layout_marginBottom="5dp" android:background="@drawable/btn_background" android:text="提交" android:textColor="@color/color_white" android:textSize="18sp" /> android:id="@+id/scroview" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/tv_btn_logout" android:layout_below="@+id/include" android:orientation="vertical" android:scrollbars="none"> android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/color_white" android:orientation="horizontal"> android:layout_width="match_parent" android:layout_height="wrap_content"> android:id="@+id/tv_phone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="28dp" android:layout_marginTop="10dp" android:text="您的手机号、QQ号、邮箱是？" android:textColor="@color/black" android:textSize="18sp" /> android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="12dp" android:layout_toRightOf="@id/tv_phone" android:text="(选填)" android:textSize="15sp" /> android:id="@+id/ed_fj" android:layout_width="500dp" android:layout_height="50dp" android:layout_marginLeft="15dp" android:layout_marginTop="50dp" android:layout_marginRight="15dp" android:background="@drawable/under_line_transparent" android:hint="填写多种联系方式时，请用逗号分隔。" android:imeOptions="actionDone" android:inputType="number" android:paddingLeft="20dp" android:textSize="14sp" /> android:id="@+id/tv_question" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/ed_fj" android:layout_marginLeft="30dp" android:layout_marginTop="30dp" android:text="问题/意见描述" android:textColor="@color/black" android:textSize="17sp" /> android:id="@+id/tv_required" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/ed_fj" android:layout_marginLeft="5dp" android:layout_marginTop="32dp" android:layout_toRightOf="@id/tv_question" android:text="(必填)" android:textSize="14sp" /> android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/ed_fj" android:orientation="horizontal"> android:id="@+id/et_xz" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_marginTop="30dp" android:layout_marginRight="20dp" android:text="（0/300）" android:textSize="14sp" />
android:id="@+id/ed_idea" android:layout_width="500dp" android:layout_height="184dp" android:layout_below="@id/tv_question" android:layout_marginLeft="15dp" android:layout_marginTop="13dp" android:layout_marginRight="15dp" android:background="@drawable/under_line_transparent" android:hint="请留下您宝贵的意见，字数不少于10个字" android:imeOptions="actionDone" android:maxLength="300" android:paddingLeft="20dp" android:paddingBottom="140dp" android:textSize="14sp" /> android:id="@+id/tv_sc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/ed_idea" android:layout_marginLeft="17dp" android:layout_marginTop="20dp" android:text="上传图片" android:textColor="@color/black" android:textSize="18sp" /> android:id="@+id/button_get_photo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/ed_idea" android:layout_marginLeft="90dp" android:layout_marginTop="23dp" android:text="（选填,您可以上传3张）" android:textSize="14sp" /> android:id="@+id/recyclerview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/tv_sc" android:layout_marginLeft="10dp" android:layout_marginTop="15dp" android:layout_marginRight="10dp" android:overScrollMode="never" /> recyclerview item布局 android:layout_width="wrap_content" android:layout_height="wrap_content"> android:layout_width="85dp" android:layout_height="85dp" android:layout_centerInParent="true"> android:id="@+id/fiv" android:layout_width="80dp" android:layout_height="80dp" android:layout_marginTop="10dp" android:contentDescription="@null" android:scaleType="centerCrop" android:src="@color/cus_view_detail_lines" /> android:id="@+id/ll_del" android:layout_width="30dp" android:layout_height="30dp" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:gravity="end" android:orientation="vertical"> android:id="@+id/iv_del" android:layout_width="25dp" android:layout_height="25dp" android:contentDescription="@null" android:scaleType="fitXY" android:src="@mipmap/red" /> android:id="@+id/iv_duration" android:layout_width="80dp" android:layout_height="80dp" android:scaleType="centerCrop" /> java代码 集合工具类 public class Image { private Bitmapphoto; public Image(Bitmap photo) { this.photo = photo; } public BitmapgetPhoto() { return photo; } public void setPhoto(Bitmap photo) { this.photo = photo; } } recyclerview适配器 public class CommitsAdapterextends RecyclerView.Adapter { //用于判断是否显示图标 //有图片 public static final int TYPE_CAMERA =1; //没有图片 public static final int TYPE_PICTURE =2; private LayoutInflatermInflater; private Contextcontext; private int selectMax =4; /** * 点击添加图片跳转 */ private onAddPicClickListenermOnAddPicClickListener; public interface onAddPicClickListener { void onAddPicClick(); } //获取最大显示个数 public void setSelectMax(int selectMax) { this.selectMax = selectMax; } //获取图片集合 this.list = list; } public CommitsAdapter(Context context, onAddPicClickListener mOnAddPicClickListener) { this.context = context; mInflater = LayoutInflater.from(context); this.mOnAddPicClickListener = mOnAddPicClickListener; } /** * 创建ViewHolder */ @NonNull @Override public ViewHolderonCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { View view =mInflater.inflate(R.layout.photo_item, viewGroup, false); final ViewHolder viewHolder =new ViewHolder(view); return viewHolder; } @Override public void onBindViewHolder(@NonNull ViewHolder viewHolder, int position) { //少于selectMax张，显示继续添加的图标 if (getItemViewType(position) ==TYPE_CAMERA) { // Image image = list.get(position); viewHolder.mImg.setImageResource(R.mipmap.group); // viewHolder.mImg.setImageBitmap(image.getPhoto()); viewHolder.mImg.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mOnAddPicClickListener.onAddPicClick(); } }); viewHolder.ll_del.setVisibility(View.INVISIBLE); }else { Image image =list.get(position); // viewHolder.mImg.setImageResource(R.mipmap.group); viewHolder.mImg.setImageBitmap(image.getPhoto()); viewHolder.ll_del.setVisibility(View.VISIBLE); viewHolder.ll_del.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { int index =viewHolder.getAdapterPosition(); // 这里有时会返回-1造成数据下标越界,具体可参考getAdapterPosition()源码， // 通过源码分析应该是bindViewHolder()暂未绘制完成导致，知道原因的也可联系我~感谢 if (index != RecyclerView.NO_POSITION) { list.remove(index); notifyItemRemoved(index); notifyItemRangeChanged(index, list.size()); // DebugUtil.i("delete position:", index + "--->remove after:" + list.size()); } } }); //itemView 的点击事件 if (mItemClickListener !=null) { viewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int adapterPosition =viewHolder.getAdapterPosition(); mItemClickListener.onItemClick(adapterPosition, v); } }); } } } //点击事件接口 protected OnItemClickListenermItemClickListener; public interface OnItemClickListener { void onItemClick(int position, View v); } public void setOnItemClickListener(OnItemClickListener listener) { this.mItemClickListener = listener; } @Override public int getItemCount() { //判断存储图片个数和最大个数 if (list.size() return list.size() +1; }else { return list.size(); } } //形式：条件表达式 ？程序块1 ：程序块2 ； //含义：如果条件表达式为真，则本程序语句执行程序块1，程序块1的值即为整个表达式的值， 否则为表达式2的值。 private boolean isShowAddItem(int position) { int size =list.size() ==0 ?0 :list.size(); return position == size; } @Override public int getItemViewType(int position) { if (isShowAddItem(position)) { //有图片 return TYPE_CAMERA; }else { //没有图片 return TYPE_PICTURE; } } public class ViewHolderextends RecyclerView.ViewHolder { ImageViewmImg; LinearLayoutll_del; ImageViewiv_duration; public ViewHolder(@NonNull View view) { super(view); mImg = (ImageView) view.findViewById(R.id.fiv); ll_del = (LinearLayout) view.findViewById(R.id.ll_del); iv_duration = (ImageView) view.findViewById(R.id.iv_duration); } } } 主类 public class CommitsActivityextends Activity { public static final int CHOOSE_PHOTO =2;// 相册 private RecyclerViewrecyclerview; private int maxSelectNum =3;//最多到几张还可以选择 private CommitsAdapteradapter; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { setContentView(R.layout.feedback_commits); super.onCreate(savedInstanceState); setinit(); setonclick(); } private void setinit() { recyclerview = findViewById(R.id.recyclerview); //设置布局管理器 // GridLayoutManager layoutManager = new GridLayoutManager(this, 3); GridLayoutManager layoutManager =new GridLayoutManager(this, 3, LinearLayoutManager.VERTICAL,false); recyclerview.setLayoutManager(layoutManager); //设置adapter adapter =new CommitsAdapter(this,onAddPicClickListener); adapter.setList(selectList); adapter.setSelectMax(maxSelectNum); recyclerview.setAdapter(adapter); } private void setonclick() { } private CommitsAdapter.onAddPicClickListeneronAddPicClickListener =new CommitsAdapter.onAddPicClickListener() { @Override public void onAddPicClick() { show(); } }; private void show() { final Dialog dialog =new Dialog(this, R.style.ActionSheetDialogStyle); View inflate = LayoutInflater.from(this).inflate(R.layout.dialog_item, null); //相册 Button bt_camera = inflate.findViewById(R.id.bt_camera); //取消 Button bt_cancel = inflate.findViewById(R.id.bt_cancel); dialog.setContentView(inflate); Window dialogWindow = dialog.getWindow(); dialogWindow.setGravity(Gravity.BOTTOM); WindowManager.LayoutParams lp = dialogWindow.getAttributes(); lp.y =20; dialogWindow.setAttributes(lp); bt_cancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.dismiss(); } }); bt_camera.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.dismiss(); if (ContextCompat.checkSelfPermission(CommitsActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(CommitsActivity.this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.READ_EXTERNAL_STORAGE}, 1); }else { //从相册获取图片 openAlbum(); } } }); dialog.show(); } private void openAlbum() { Intent intent =new Intent("android.intent.action.GET_CONTENT"); intent.setType("image/*"); startActivityForResult(intent, CHOOSE_PHOTO);//打开相册 } //相册 @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode) { case 1: if (grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { openAlbum(); }else { Toast.makeText(this, "你拒绝了权限申请，可能无法打开相册哟", Toast.LENGTH_SHORT).show(); } break; default: } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case CHOOSE_PHOTO: if (resultCode ==RESULT_OK) { // 判断手机系统版本号 if (Build.VERSION.SDK_INT >=19) { // 4.4及以上系统使用这个方法处理图片 handleImageOnKitKat(data); }else { // 4.4以下系统使用这个方法处理图片 handleImageBeforeKitKat(data); } } break; default: break; } } @TargetApi(19) private void handleImageOnKitKat(Intent data) { String imagePath =null; Uri uri = data.getData(); if (DocumentsContract.isDocumentUri(this, uri)) { // 如果是document类型的Uri，则通过document id处理 String docId = DocumentsContract.getDocumentId(uri); if ("com.android.providers.media.documents".equals(uri.getAuthority())) { String id = docId.split(":")[1]; // 解析出数字格式的id String selection = MediaStore.Images.Media._ID +"=" + id; imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection); }else if ("com.android.providers.downloads.documents".equals(uri. getAuthority())) { Uri contentUri = ContentUris.withAppendedId(Uri.parse("content: downloads/public_downloads"), Long.valueOf(docId)); imagePath = getImagePath(contentUri, null); } }else if ("content".equalsIgnoreCase(uri.getScheme())) { // 如果是content类型的Uri，则使用普通方式处理 imagePath = getImagePath(uri, null); }else if ("file".equalsIgnoreCase(uri.getScheme())) { // 如果是file类型的Uri，直接获取图片路径即可 imagePath = uri.getPath(); } displayImage(imagePath); // 根据图片路径显示图片 // mWeiboDialog = WeiboDialogUtils.createLoadingDialog(FeedbackDetails.this, "加载中..."); // handler.sendEmptyMessageDelayed(1, 2000); } private void handleImageBeforeKitKat(Intent data) { Uri uri = data.getData(); String imagePath = getImagePath(uri, null); displayImage(imagePath); // mWeiboDialog = WeiboDialogUtils.createLoadingDialog(FeedbackDetails.this, "加载中..."); // handler.sendEmptyMessageDelayed(1, 2000); } private StringgetImagePath(Uri uri, String selection) { String path =null; // 通过Uri和selection来获取真实的图片路径 Cursor cursor = getContentResolver().query(uri, null, selection, null, null); if (cursor !=null) { if (cursor.moveToFirst()) { path = cursor.getString(cursor.getColumnIndex(MediaStore. Images.Media.DATA)); } cursor.close(); } return path; } private void displayImage(String imagePath) { BitmapFactory.Options options =new BitmapFactory.Options(); options.inJustDecodeBounds =false; // Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options); Bitmap bitmap1=getBitmapFromUri(this, getImageContentUri(this,imagePath)); if (bitmap1 !=null) { //获取图片 // File headFile = null; //把获取到的图片放进集合里 每次获取一个 selectList.add(new Image(bitmap1)); adapter.setList(selectList); adapter.notifyDataSetChanged(); //把bitmap转为数组 // File headFile = saveMyBitmap(bitmap1, "head"); // upphoto(headFile); }else { Toast.makeText(this, "获取图片失败", Toast.LENGTH_SHORT).show(); } } // 通过uri加载图片 public static BitmapgetBitmapFromUri(Context context, Uri uri) { try { ParcelFileDescriptor parcelFileDescriptor = context.getContentResolver().openFileDescriptor(uri, "r"); FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor(); Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor); parcelFileDescriptor.close(); return image; }catch (Exception e) { e.printStackTrace(); } return null; } public static UrigetImageContentUri(Context context, String path) { Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.Media._ID }, MediaStore.Images.Media.DATA +"=? ", new String[] { path }, null); if (cursor !=null && cursor.moveToFirst()) { int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID)); Uri baseUri = Uri.parse("content://media/external/images/media"); return Uri.withAppendedPath(baseUri, "" + id); }else { // 如果图片不在手机的共享图片数据库，就先把它插入。 if (new File(path).exists()) { ContentValues values =new ContentValues(); values.put(MediaStore.Images.Media.DATA, path); return context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); }else { return null; } } } //将bitmap转化为png格式 //首先获取了系统相册的地址，然后每次我拍下照片或者选择照片时， // 都进行简单的压缩，因为图片要上传到服务器进行审核管理，做成微信头像之类的超级压缩方法有损画质， // 所以我只是进行了简单的压缩上传最后写成一个文件。（在第二个页面的时候可能会有几个问题， // 三个ImageView即是三个bitmap，三个File文件。如何判断及正确的显示，我们可以定义成全局变量， // 因为都是点击事件，所以bitmap会在点击后修改，然后保存下来。 public FilesaveMyBitmap(Bitmap mBitmap, String prefix) { File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM); File file =null; try { file = File.createTempFile( prefix, /* prefix */ ".jpg" // , /* suffix */ // storageDir /* directory */ ); FileOutputStream fos =new FileOutputStream(file); //创建一个字节数组输出流对象 //Bitmap.CompressFormat format 图像的压缩格式； //int quality 图像压缩率，0-100。 0 压缩100%，100意味着不压缩； //OutputStream stream 写入压缩数据的输出流； mBitmap.compress(Bitmap.CompressFormat.JPEG, 50, fos);//通过bitmap中的compress,将图片压缩到os流对象中. //其中第二个参数quality,为100表示不压缩,如果为80,表示压缩百分之20. // Bitmap.createScaledBitmap(mBitmap, mBitmap.getWidth()/2, mBitmap.getHeight()/2, true); fos.flush(); fos.close(); }catch (Exception e) { e.printStackTrace(); } return file; } }