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這篇文章主要為大家展示了“Android怎么實現仿微信朋友圈圖片選擇器”,內容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領大家一起研究并學習一下“Android怎么實現仿微信朋友圈圖片選擇器”這篇文章吧。
最近做開發需要解決一個模仿微信朋友圈附加圖片的功能,具體要求如下:
(1)從手機中最多選擇3張圖片,可拍照上傳;
(2)選擇的圖片可以點擊移除然后再添加新圖片;
(3)可以在手機包含圖片的各個文件夾中隨意選擇等。
本博客主要實現的是以上功能,其他諸如主界面布局、各種控件添加和提交功能等旨在說明問題,只做了簡單處理,重點在圖片選擇添加部分。該功能的實現主要引用了一個圖片加載的開源框架universal-image-loader。
其中截圖如下:
為了不過于冗余,過濾了部分布局文件和資源文件,在這里提供源碼下載地址,有興趣的讀者可以下載觀看(注:我使用的 Android Studio 1.4 , SdkVersion 為23 ,在小米note【Android 4.4 】上調試)。
下面開始我們的主要內容:
主界面布局activity_main.xml (主要使用一個GridView實現):
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:background="#f7614d" android:paddingLeft="37px" android:layout_height="70dp"> <TextView android:layout_centerInParent="true" android:text="附圖案例" android:textSize="25sp" android:textColor="#ffffff" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> <View android:layout_width="fill_parent" android:layout_height="20dp" android:background="#00000000"/> <LinearLayout android:paddingLeft="10dp" android:paddingRight="10dp" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/tv11" android:layout_alignParentLeft="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="文字描述" android:textSize="23sp" /> <View android:layout_width="fill_parent" android:layout_height="10dp" android:background="#00000000"/> <EditText android:paddingTop="20dp" android:background="@drawable/bg_et" android:id="@+id/editText" android:inputType="textMultiLine" android:gravity="left|top" android:padding="5dp" android:maxLength="300" android:hint="客官,寫點評論吧..." android:textColorHint="#808080" android:textSize="20sp" android:layout_width="fill_parent" android:layout_height="150dp" /> <View android:layout_width="fill_parent" android:layout_height="20dp" android:background="#00000000"/> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="附加圖片" android:textSize="23sp" /> <View android:layout_width="fill_parent" android:layout_height="10dp" android:background="#00000000"/> <GridView android:id="@+id/gridview" android:layout_width="fill_parent" android:layout_height="200dp" android:horizontalSpacing="2dp" android:verticalSpacing="5dp" android:scrollbars="none" android:listSelector="#00000000" android:numColumns="3" > </GridView> <Button android:id="@+id/submit_btn" android:layout_width="wrap_content" android:layout_height="50dp" android:layout_centerInParent="true" android:background="@drawable/bg_submit" android:text="提交" android:textSize="23sp" android:textColor="#FFFFFF"/> </LinearLayout> </LinearLayout>
圖片選擇界面布局activity_select_picture.xml :
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="48dp" android:background="#c000" > <Button android:id="@+id/btn_back" android:layout_width="24dp" android:layout_height="24dp" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_margin="8dp" android:background="@drawable/ic_back_light" android:onClick="back" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="8dp" android:layout_toRightOf="@+id/btn_back" android:text="圖片" android:textColor="#ffffff" android:textSize="16sp" /> <Button android:id="@+id/btn_ok" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="8dp" android:background="@null" android:gravity="center" android:onClick="ok" android:text="完成" android:textColor="#fff" android:textSize="14sp" /> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="#d000" > <GridView android:id="@+id/gridview" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/bottom" android:horizontalSpacing="3dp" android:numColumns="3" android:scrollbars="none" android:verticalSpacing="5dp" > </GridView> <RelativeLayout android:id="@+id/bottom" android:layout_width="match_parent" android:layout_height="48dp" android:layout_alignParentBottom="true" android:background="#c000" > <Button android:id="@+id/btn_select" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_margin="8dp" android:background="@drawable/spinner_bg" android:onClick="select" android:text="所有圖片" android:textColor="#fff" android:textSize="14sp" /> </RelativeLayout> <ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="360dp" android:layout_above="@id/bottom" android:background="#fff" android:visibility="gone" > </ListView> </RelativeLayout> </LinearLayout>
主界面Java代碼MainActivity.java :
package com.custompictureselect; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.ImageView; import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; import com.nostra13.universalimageloader.core.assist.QueueProcessingType; import java.util.ArrayList; public class MainActivity extends Activity { private GridView gridview; private EditText editText ; private GridAdapter gridAdapter; private Context context ; private static final int REQUEST_PICK = 0; //存放所有選擇的照片 private ArrayList<String> allSelectedPicture = new ArrayList<String>(); //存放從選擇界面選擇的照片 private ArrayList<String> selectedPicture = new ArrayList<String>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); context = this ; //設置在activity啟動的時候輸入法默認是不開啟的 getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this) .threadPriority(Thread.NORM_PRIORITY - 2)//設置當前線程的優先級 .denyCacheImageMultipleSizesInMemory() .diskCacheFileNameGenerator(new Md5FileNameGenerator())//使用MD5對UIL進行加密命名 .diskCacheSize(100 * 1024 * 1024)//50 Mb sd卡(本地)緩存的最大值 .diskCacheFileCount(300)// 可以緩存的文件數量 .tasksProcessingOrder(QueueProcessingType.LIFO)//后進先出 .build(); //初始化操作 ImageLoader.getInstance().init(config); initView(); } /** * 初始化視圖 */ private void initView(){ editText = (EditText) findViewById(R.id.editText); //顯示圖片 gridview = (GridView) findViewById(R.id.gridview); gridAdapter = new GridAdapter(); gridview.setAdapter(gridAdapter); } /** * 展示圖片的GridView的適配器 */ class GridAdapter extends BaseAdapter { public LayoutInflater layoutInflater = LayoutInflater.from(context); @Override public int getCount() { return allSelectedPicture.size()+ 1; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = null ; if (convertView == null) { holder = new ViewHolder(); convertView = layoutInflater.inflate(R.layout.childgrid_item, null); holder.image = (ImageView) convertView.findViewById(R.id.child_iv); holder.btn = (Button) convertView.findViewById(R.id.child_delete); holder.image.setScaleType(ImageView.ScaleType.CENTER_CROP); convertView.setTag(holder); } else{ holder = (ViewHolder) convertView.getTag(); } if (position == allSelectedPicture.size()) { holder.image.setImageBitmap(BitmapFactory.decodeResource( context.getResources(), R.drawable.icon_addpic)); holder.btn.setVisibility(View.GONE); holder.image.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { selectClick(); } }); if (position == 3) { holder.image.setVisibility(View.GONE); } } else { ImageLoader.getInstance().displayImage("file://" + allSelectedPicture.get(position), holder.image); holder.btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //點擊后移除圖片 allSelectedPicture.remove(position); //更新UI gridview.setAdapter(gridAdapter); } }); } return convertView; } } public class ViewHolder { public ImageView image; public Button btn ; } private void selectClick(){ Intent intent = new Intent(); intent.setClass(MainActivity.this , SelectPictureActivity.class); Bundle bundle = new Bundle(); bundle.putStringArrayList("allSelectedPicture", allSelectedPicture); intent.putExtras(bundle); if(allSelectedPicture.size()< 3){ startActivityForResult(intent, REQUEST_PICK); } } @SuppressWarnings("unchecked") @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { selectedPicture = (ArrayList) data.getSerializableExtra(SelectPictureActivity.INTENT_SELECTED_PICTURE); for(String str : selectedPicture){ if(!allSelectedPicture.contains(str)){ allSelectedPicture.add(str); gridview.setAdapter(gridAdapter); } } } } }
選擇圖片界面Java代碼SelectPictureActivity.java :
package com.custompictureselect; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.Window; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.TranslateAnimation; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.GridView; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.assist.ImageScaleType; import java.io.File; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; public class SelectPictureActivity extends Activity { // 最多選擇圖片的個數 private static int MAX_NUM = 3; private static final int TAKE_PICTURE = 520; public static final String INTENT_MAX_NUM = "intent_max_num"; public static final String INTENT_SELECTED_PICTURE = "intent_selected_picture"; private Context context; private GridView gridview; private PictureAdapter adapter; /** * 臨時的輔助類,用于防止同一個文件夾的多次掃描 */ private HashMap<String, Integer> tmpDir = new HashMap<String, Integer>(); private ArrayList<ImageFloder> mDirPaths = new ArrayList<ImageFloder>(); /** * 具體下載圖片,緩存圖片,顯示圖片的具體執行類,它有兩個具體的方法displayImage(...)、loadImage(...), */ private ImageLoader loader; /** * 用于指導每一個Imageloader根據網絡圖片的狀態(空白、下載錯誤、正在下載)顯示對應的圖片, * 是否將緩存加載到磁盤上,下載完后對圖片進行怎么樣的處理。 */ private DisplayImageOptions options; private ContentResolver mContentResolver; //選擇按鈕和完成按鈕 private Button btn_select, btn_ok; //圖片文件的列表 private ListView listview; private FolderAdapter folderAdapter; private ImageFloder imageAll, currentImageFolder; //已選擇的圖片 private ArrayList<String> selectedPicture = new ArrayList<String>(); private String cameraPath = null; private int isExisted ; private ArrayList<String> existedPictureList = new ArrayList<String>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_select_picture); MAX_NUM = getIntent().getIntExtra(INTENT_MAX_NUM, 3); Bundle bundle = getIntent().getExtras(); existedPictureList = bundle.getStringArrayList("allSelectedPicture"); isExisted = existedPictureList.size(); context = this; mContentResolver = getContentResolver(); loader = ImageLoader.getInstance(); options = new DisplayImageOptions.Builder() .showImageOnLoading(R.drawable.ic_launcher)//設置圖片在下載期間顯示的圖片 .showImageForEmptyUri(R.drawable.ic_launcher)//設置圖片Uri為空或是錯誤的時候顯示的圖片 .showImageOnFail(R.drawable.ic_launcher)//設置圖片加載/解碼過程中錯誤時候顯示的圖片 .cacheInMemory(true)//設置下載的圖片是否緩存在內存中 .cacheOnDisk(true) //設置下載的圖片是否緩存在SD卡中 .considerExifParams(true)//啟用EXIF和JPEG圖像格式 .imageScaleType(ImageScaleType.EXACTLY)//圖像將完全按比例縮小的目標大小 .bitmapConfig(Bitmap.Config.RGB_565)//設置圖片的解碼類型 .build(); initView(); } /** * 點擊"所有圖片"按鈕事件 * @param v */ public void select(View v) { if (listview.getVisibility() == View.VISIBLE) { hideListAnimation(); } else { listview.setVisibility(View.VISIBLE); showListAnimation(); folderAdapter.notifyDataSetChanged(); } } /** * 設置ListView的移動的動畫效果 */ public void showListAnimation() { TranslateAnimation ta = new TranslateAnimation(1, 0f, 1, 0f, 1, 1f, 1, 0f); ta.setDuration(200); listview.startAnimation(ta); } /** * 隱藏ListView的移動的動畫效果 */ public void hideListAnimation() { TranslateAnimation ta = new TranslateAnimation(1, 0f, 1, 0f, 1, 0f, 1, 1f); ta.setDuration(200); listview.startAnimation(ta); ta.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { listview.setVisibility(View.INVISIBLE); } }); } /** * 點擊完成按鈕 */ public void ok(View v) { Intent data = new Intent(); data.putExtra(INTENT_SELECTED_PICTURE, selectedPicture); setResult(RESULT_OK, data); this.finish(); } /** * 視圖初始化 */ private void initView() { imageAll = new ImageFloder(); imageAll.setDir(getResources().getString(R.string.dir_all_pictures)); currentImageFolder = imageAll; mDirPaths.add(imageAll); btn_ok = (Button) findViewById(R.id.btn_ok); btn_ok.setText(getResources().getString(R.string.complete) + isExisted + "/" + MAX_NUM); btn_select = (Button) findViewById(R.id.btn_select); gridview = (GridView) findViewById(R.id.gridview); adapter = new PictureAdapter(); gridview.setAdapter(adapter); gridview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (position == 0) { goCamare(); } } }); listview = (ListView) findViewById(R.id.listview); folderAdapter = new FolderAdapter(); listview.setAdapter(folderAdapter); listview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { currentImageFolder = mDirPaths.get(position); hideListAnimation(); adapter.notifyDataSetChanged(); btn_select.setText(currentImageFolder.getName()); } }); getThumbnail(); } /** * 使用相機拍照 */ protected void goCamare() { if (isExisted + selectedPicture.size() + 1 > MAX_NUM) { Toast.makeText(context, getResources().getString(R.string.chose_at_most) + MAX_NUM + getResources().getString(R.string.sheet), Toast.LENGTH_SHORT).show(); return; } Intent openCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); Uri imageUri = getOutputMediaFileUri(); openCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); startActivityForResult(openCameraIntent, TAKE_PICTURE); } /** * 用于拍照時獲取輸出的Uri */ protected Uri getOutputMediaFileUri() { File mediaStorageDir = new File( Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "Night"); if (!mediaStorageDir.exists()) { if (!mediaStorageDir.mkdirs()) { Log.d("MyCameraApp", "failed to create directory"); return null; } } String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); File mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg"); cameraPath = mediaFile.getAbsolutePath(); return Uri.fromFile(mediaFile); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK && cameraPath != null) { selectedPicture.add(cameraPath); Intent data2 = new Intent(); data2.putExtra(INTENT_SELECTED_PICTURE, selectedPicture); setResult(RESULT_OK, data2); this.finish(); } } public void back(View v) { onBackPressed(); } class PictureAdapter extends BaseAdapter { @Override public int getCount() { return currentImageFolder.images.size() + 1; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { //自定義的一個類用來緩存convertview ViewHolder holder = null; if (convertView == null) { convertView = View.inflate(context, R.layout.grid_item_picture, null); holder = new ViewHolder(); holder.iv = (ImageView) convertView.findViewById(R.id.iv); holder.checkBox = (Button) convertView.findViewById(R.id.check); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } if (position == 0) {//拍攝圖片 holder.iv.setImageResource(R.drawable.pickphotos_to_camera_normal); holder.checkBox.setVisibility(View.INVISIBLE); } else { position = position - 1; holder.checkBox.setVisibility(View.VISIBLE); final ImageItem item = currentImageFolder.images.get(position); //顯示圖片 loader.displayImage("file://" + item.path, holder.iv, options); //是否選中 boolean isSelected = (selectedPicture.contains(item.path) || existedPictureList.contains(item.path)); holder.checkBox.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //若選中的圖片多于所設置的上限,不再加入 if (!v.isSelected() && isExisted + selectedPicture.size() + 1 > MAX_NUM) { Toast.makeText(context, getResources().getString(R.string.chose_at_most) + MAX_NUM + getResources().getString(R.string.sheet), Toast.LENGTH_SHORT).show(); return; } //二次選擇,移除 if (selectedPicture.contains(item.path)|| existedPictureList.contains(item.path)) { selectedPicture.remove(item.path); } else { //加入數組 selectedPicture.add(item.path); } btn_ok.setEnabled(selectedPicture.size()>0); btn_ok.setText(getResources().getString(R.string.complete) + (selectedPicture.size()+ isExisted) + "/" + MAX_NUM); v.setSelected(selectedPicture.contains(item.path)|| existedPictureList.contains(item.path)); } }); holder.checkBox.setSelected(isSelected); } return convertView; } } //自定義的一個類用來緩存convertview class ViewHolder { ImageView iv; Button checkBox; } /** * 所有圖片 */ class FolderAdapter extends BaseAdapter { @Override public int getCount() { return mDirPaths.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { FolderViewHolder holder = null; if (convertView == null) { convertView = View.inflate(context, R.layout.list_dir_item, null); holder = new FolderViewHolder(); holder.id_dir_item_image = (ImageView) convertView.findViewById(R.id.id_dir_item_image); holder.id_dir_item_name = (TextView) convertView.findViewById(R.id.id_dir_item_name); holder.id_dir_item_count = (TextView) convertView.findViewById(R.id.id_dir_item_count); holder.choose = (ImageView) convertView.findViewById(R.id.choose); convertView.setTag(holder); } else { holder = (FolderViewHolder) convertView.getTag(); } ImageFloder item = mDirPaths.get(position); loader.displayImage("file://" + item.getFirstImagePath(), holder.id_dir_item_image, options); holder.id_dir_item_count.setText(item.images.size() + getResources().getString(R.string.sheet)); holder.id_dir_item_name.setText(item.getName()); holder.choose.setVisibility(currentImageFolder == item ? View.VISIBLE : View.GONE); return convertView; } } //自定義的一個類用來緩存convertview class FolderViewHolder { ImageView id_dir_item_image; ImageView choose; TextView id_dir_item_name; TextView id_dir_item_count; } /** * 獲取縮略圖 */ private void getThumbnail() { Cursor mCursor = mContentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Images.ImageColumns.DATA }, "", null, MediaStore.MediaColumns.DATE_ADDED + " DESC"); if (mCursor.moveToFirst()) { int _date = mCursor.getColumnIndex(MediaStore.Images.Media.DATA); do { // 獲取圖片的路徑 String path = mCursor.getString(_date); imageAll.images.add(new ImageItem(path)); // 獲取該圖片的父路徑名 File parentFile = new File(path).getParentFile(); if (parentFile == null) { continue; } ImageFloder imageFloder = null; String dirPath = parentFile.getAbsolutePath(); if (!tmpDir.containsKey(dirPath)) { // 初始化imageFloder imageFloder = new ImageFloder(); imageFloder.setDir(dirPath); imageFloder.setFirstImagePath(path); mDirPaths.add(imageFloder); tmpDir.put(dirPath, mDirPaths.indexOf(imageFloder)); } else { imageFloder = mDirPaths.get(tmpDir.get(dirPath)); } imageFloder.images.add(new ImageItem(path)); } while (mCursor.moveToNext()); } mCursor.close(); tmpDir = null; } class ImageFloder { /** * 圖片的文件夾路徑 */ private String dir; /** * 第一張圖片的路徑 */ private String firstImagePath; /** * 文件夾的名稱 */ private String name; public List<ImageItem> images = new ArrayList<ImageItem>(); public String getDir() { return dir; } public void setDir(String dir) { this.dir = dir; int lastIndexOf = this.dir.lastIndexOf("/"); this.name = this.dir.substring(lastIndexOf); } public String getFirstImagePath() { return firstImagePath; } public void setFirstImagePath(String firstImagePath) { this.firstImagePath = firstImagePath; } public String getName() { return name; } } class ImageItem { String path; public ImageItem(String p) { this.path = p; } } }
最后還要在清單文件AndroidManifest.xml中設置權限:
<uses-permission android:name="android.permission.INTERNET"/> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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