Android实现本地图片选择及预览缩放效果

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context="com.cdxsc.imageselect_y.ImageSelecteActivity">   <RelativeLayout  android:layout_width="match_parent"  android:layout_height="45dp"  android:background="@android:color/white">   <ImageButton   android:id="@+id/ib_back"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_centerVertical="true"   android:layout_marginLeft="10dp"   android:background="@mipmap/action_bar_back_normal" />   <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_centerVertical="true"   android:layout_marginLeft="10dp"   android:layout_toRightOf="@id/ib_back"   android:text="选择图片"   android:textColor="#000"   android:textSize="16sp" />   <TextView   android:id="@+id/tv_preview"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:layout_alignParentRight="true"   android:layout_centerVertical="true"   android:layout_marginRight="10dp"   android:enabled="false"   android:text="预览"   android:textColor="#BEBFBF"   android:textSize="16sp" />  </RelativeLayout>   <View  android:layout_width="match_parent"  android:layout_height="0.5dp"  android:background="#eeeeee" />   <android.support.v7.widget.RecyclerView  android:id="@+id/rv"  android:layout_width="match_parent"  android:layout_height="0dp"  android:layout_weight="1"></android.support.v7.widget.RecyclerView>   <RelativeLayout  android:layout_width="match_parent"  android:layout_height="50dp">   <TextView   android:id="@+id/tv_allPic"   android:layout_width="wrap_content"   android:layout_height="match_parent"   android:layout_centerVertical="true"   android:layout_marginLeft="10dp"   android:clickable="true"   android:gravity="center_vertical"   android:text="所有图片"   android:textColor="@android:color/black"   android:textSize="16sp" />   <Button   android:id="@+id/bt_confirm"   android:layout_width="wrap_content"   android:layout_height="35dp"   android:layout_alignParentRight="true"   android:layout_centerVertical="true"   android:layout_marginRight="10dp"   android:background="@drawable/shape_disable"   android:enabled="false"   android:text="确定"   android:textColor="#676767"   android:textSize="16sp" />  </RelativeLayout> </LinearLayout> 

public class ImageSelecteActivity extends AppCompatActivity {   private static final String TAG = "lzy";  @BindView(R.id.ib_back)  ImageButton mButtonBack;  @BindView(R.id.tv_preview)  TextView mTextViewPreview;  @BindView(R.id.rv)  RecyclerView mRecyclerView;  @BindView(R.id.tv_allPic)  TextView mTextViewAllPic;  @BindView(R.id.bt_confirm)  Button mButtonConfirm;  private GalleryPopupWindow mPopupWindow;  //存储每个目录下的图片路径,key是文件名  private Map<String, List<String>> mGroupMap = new HashMap<>();  private List<ImageBean> list = new ArrayList<>();  //当前文件夹显示的图片路径  private List<String> listPath = new ArrayList<>();  //所选择的图片路径集合  private ArrayList<String> listSelectedPath = new ArrayList<>();    private Handler mHandler = new Handler() {  @Override  public void handleMessage(Message msg) {   //扫描完成后   getGalleryList();   listPath.clear();   listPath.addAll(mGroupMap.get("所有图片"));   adapter.update(listPath);   if (mPopupWindow != null)   mPopupWindow.notifyDataChanged();  }  };  private ImageSelectAdapter adapter;   @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_image_selecte);  ButterKnife.bind(this);  init();  }   private void init() {  getImages();  mRecyclerView.setLayoutManager(new GridLayoutManager(ImageSelecteActivity.this, 3));  adapter = new ImageSelectAdapter(this, listPath);  mRecyclerView.setAdapter(adapter);  adapter.setOnCheckedChangedListener(onCheckedChangedListener);  }   @OnClick({R.id.ib_back, R.id.tv_preview, R.id.tv_allPic, R.id.bt_confirm})  public void onClick(View view) {  switch (view.getId()) {   case R.id.ib_back:   finish();   break;   case R.id.tv_preview://跳转预览界面   Intent intent = new Intent(ImageSelecteActivity.this, ImagePreviewActivity.class);   //把选中的图片集合传入预览界面   intent.putStringArrayListExtra("pic", listSelectedPath);   startActivity(intent);   break;   case R.id.tv_allPic://选择图片文件夹   if (mPopupWindow == null) {    //把文件夹列表的集合传入显示    mPopupWindow = new GalleryPopupWindow(this, list);    mPopupWindow.setOnItemClickListener(new GalleryPopupWindow.OnItemClickListener() {    @Override    public void onItemClick(String fileName) {     //切换了文件夹，清除之前的选择的信息     setButtonDisable();     listPath.clear();     listSelectedPath.clear();     //把当前选择的文件夹内图片的路径放入listPath，更新界面     listPath.addAll(mGroupMap.get(fileName));     adapter.update(listPath);     mTextViewAllPic.setText(fileName);    }    });   }   mPopupWindow.showAtLocation(mRecyclerView, Gravity.BOTTOM, 0, dp2px(50, ImageSelecteActivity.this));   break;   case R.id.bt_confirm://确定   for (int i = 0; i < listSelectedPath.size(); i++) {    //这里可通过Glide把它转为Bitmap    Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() {    @Override    public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {     Log.i(TAG, "onResourceReady: " + resource);    }    });   }   break;  }  }   /**  * dp转px  */  public static int dp2px(int dp, Context context) {  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,   context.getResources().getDisplayMetrics());  }   //选择图片变化的监听  private ImageSelectAdapter.OnCheckedChangedListener onCheckedChangedListener = new ImageSelectAdapter.OnCheckedChangedListener() {  @Override  public void onChanged(boolean isChecked, String path, CheckBox cb, int position) {   if (isChecked) {//选中   if (listSelectedPath.size() == 9) {    Toast.makeText(ImageSelecteActivity.this, "最多选择9张图片", Toast.LENGTH_SHORT).show();    //把点击变为checked的图片变为没有checked    cb.setChecked(false);    adapter.setCheckedBoxFalse(position);    return;   }   //选中的图片路径加入集合   listSelectedPath.add(path);    } else {//取消选中   //从集合中移除   if (listSelectedPath.contains(path))    listSelectedPath.remove(path);   }   //如果没有选中的按钮不可点击   if (listSelectedPath.size() == 0) {   setButtonDisable();   } else {   setButtonEnable();   }  }  };   //选中图片时的按钮状态  private void setButtonEnable() {  mButtonConfirm.setBackgroundResource(R.drawable.selector_bt);  mButtonConfirm.setTextColor(Color.parseColor("#ffffff"));  mButtonConfirm.setEnabled(true);  mTextViewPreview.setEnabled(true);  mTextViewPreview.setTextColor(getResources().getColor(R.color.colorAccent));  mButtonConfirm.setText("确定" + listSelectedPath.size() + "/9");  }   //没有选择时按钮状态  private void setButtonDisable() {  mButtonConfirm.setBackgroundResource(R.drawable.shape_disable);  mButtonConfirm.setTextColor(Color.parseColor("#676767"));  mButtonConfirm.setEnabled(false);  mTextViewPreview.setEnabled(false);  mTextViewPreview.setTextColor(Color.parseColor("#BEBFBF"));  mButtonConfirm.setText("确定");  }   /**  * 利用ContentProvider扫描手机中的图片，此方法在运行在子线程中  */  private void getImages() {  new Thread(new Runnable() {    @Override   public void run() {   Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;   ContentResolver mContentResolver = ImageSelecteActivity.this.getContentResolver();   //只查询jpeg和png的图片 //  Cursor mCursor = mContentResolver.query(mImageUri, null, //   MediaStore.Images.Media.MIME_TYPE + "=? or " //    + MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?", //   new String[]{"image/jpeg", "image/png", "image/jpg"}, MediaStore.Images.Media.DATE_MODIFIED);   Cursor mCursor = mContentResolver.query(mImageUri, null, null, null,    MediaStore.Images.Media.DATE_MODIFIED);   if (mCursor == null) {    return;   }   //存放所有图片的路径   List<String> listAllPic = new ArrayList<String>();   while (mCursor.moveToNext()) {    //获取图片的路径    String path = mCursor.getString(mCursor     .getColumnIndex(MediaStore.Images.Media.DATA));     //获取该图片的父路径名    String parentName = new File(path).getParentFile().getName();    listAllPic.add(path);     //根据父路径名将图片放入到mGruopMap中    if (!mGroupMap.containsKey(parentName)) {    List<String> chileList = new ArrayList<String>();    chileList.add(path);    mGroupMap.put(parentName, chileList);    } else {    mGroupMap.get(parentName).add(path);    }   }   //添加所有图片   mGroupMap.put("所有图片", listAllPic);   //通知Handler扫描图片完成   mHandler.sendEmptyMessage(0);   mCursor.close();   }  }).start();   }   //获取相册文件夹列表  private void getGalleryList() {  Iterator<Map.Entry<String, List<String>>> iterator = mGroupMap.entrySet().iterator();  while (iterator.hasNext()) {   Map.Entry<String, List<String>> next = iterator.next();   ImageBean imageBean = new ImageBean();   imageBean.setFileName(next.getKey());   imageBean.setFirstPicPath(next.getValue().get(0));   imageBean.setCount(next.getValue().size());   if (next.getKey().equals("所有图片"))   list.add(0, imageBean);   else   list.add(imageBean);  }  } } 

public class ImageSelectAdapter extends RecyclerView.Adapter<ImageSelectAdapter.NViewHolder> {   private Context context;  private List<String> list = new ArrayList<>();  private OnCheckedChangedListener onCheckedChangedListener;  private List<Boolean> listChecked = new ArrayList<>();   public ImageSelectAdapter(Context context, List<String> list) {  this.context = context;  this.list.addAll(list);  setListCheched(list);  }   public void update(List<String> list) {  this.list.clear();  this.list.addAll(list);  setListCheched(list);  notifyDataSetChanged();   }   /**  * 设置listChecked的初始值  *  * @param list  */  private void setListCheched(List<String> list) {  listChecked.clear();  for (int i = 0; i < list.size(); i++) {   listChecked.add(false);  }  }   //当点击超过了九张图片，再点击的设置为false  public void setCheckedBoxFalse(int pos) {  listChecked.set(pos, false);  }   public interface OnCheckedChangedListener {  /**   * @param isChecked 是否选中   * @param path 点击的图片路径   * @param cb 点击的CheckBox   * @param pos 点击的位置   */  void onChanged(boolean isChecked, String path, CheckBox cb, int pos);  }   public void setOnCheckedChangedListener(OnCheckedChangedListener onCheckedChangedListener) {  this.onCheckedChangedListener = onCheckedChangedListener;  }   @Override  public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_image_select, parent, false));  }   @Override  public void onBindViewHolder(final NViewHolder holder, final int position) {  Glide.with(context).load("file://" + list.get(position)).into(holder.iv);  holder.cb.setChecked(listChecked.get(position));  holder.itemView.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {   holder.cb.setChecked(!holder.cb.isChecked());   if (holder.cb.isChecked()) {    listChecked.set(position, true);   } else {    listChecked.set(position, false);   }   if (onCheckedChangedListener != null) {    onCheckedChangedListener.onChanged(holder.cb.isChecked(), list.get(position), holder.cb, position);   }   }  });  }   @Override  public int getItemCount() {  return list.size();  }   public class NViewHolder extends RecyclerView.ViewHolder {  @BindView(R.id.iv_itemImageSelect)  ImageView iv;  @BindView(R.id.cb_itemImageSelect)  CheckBox cb;   public NViewHolder(View itemView) {   super(itemView);   ButterKnife.bind(this, itemView);  }  }  } 

/**  * Created by lzy on 2017/2/8.  */ public class GalleryPopupWindow extends PopupWindow {  private static final String TAG = "lzy";   RecyclerView mRecyclerView;   private Activity activity;  private GalleryPopupWindow.OnItemClickListener onItemClickListener;  private List<ImageBean> list;  private GalleryAdapter adapter;    public GalleryPopupWindow(Activity context, List<ImageBean> list) {  super(context);  this.activity = context;  this.list = list;  LayoutInflater inflater = (LayoutInflater) context   .getSystemService(Context.LAYOUT_INFLATER_SERVICE);  View contentView = inflater.inflate(R.layout.popu_gallery, null);  initView(contentView);   int h = context.getWindowManager().getDefaultDisplay().getHeight();  int w = context.getWindowManager().getDefaultDisplay().getWidth();  this.setContentView(contentView);  this.setWidth(w);  this.setHeight(ImageSelecteActivity.dp2px(350, context));  this.setFocusable(false);  this.setOutsideTouchable(true);  this.update();   setBackgroundDrawable(new ColorDrawable(000000000));  }   public void notifyDataChanged() {  adapter.notifyDataSetChanged();  }   private void initView(View contentView) {  mRecyclerView = (RecyclerView) contentView.findViewById(R.id.rv_gallery);  mRecyclerView.setLayoutManager(new LinearLayoutManager(activity));  adapter = new GalleryAdapter(list, activity);  adapter.setOnItemClickListener(new GalleryAdapter.OnItemClickListener() {   @Override   public void onItemClick(String fileName) {   if (onItemClickListener != null) {    onItemClickListener.onItemClick(fileName);    dismiss();   }   }  });  mRecyclerView.setAdapter(adapter);   }   //暴露点击的接口  public interface OnItemClickListener {  /**   * @param keyValue   */  void onItemClick(String keyValue);  }   public void setOnItemClickListener(OnItemClickListener onItemClickListener) {  this.onItemClickListener = onItemClickListener;  } } 

/**  * Created by lzy on 2017/2/8.  */ public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.NViewHolder> {   private Context context;  private List<ImageBean> list;  private OnItemClickListener onItemClickListener;  //用于记录是选中的哪一个文件夹  private int selectedPos;   public GalleryAdapter(List<ImageBean> list, Context context) {  this.list = list;  this.context = context;  }   public interface OnItemClickListener {  void onItemClick(String fileName);  }   public void setOnItemClickListener(OnItemClickListener onItemClickListener) {  this.onItemClickListener = onItemClickListener;  }   @Override  public NViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  return new NViewHolder(LayoutInflater.from(context).inflate(R.layout.item_gallery, parent, false));  }   @Override  public void onBindViewHolder(NViewHolder holder, final int position) {  holder.itemView.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {   selectedPos = position;   notifyDataSetChanged();   if (onItemClickListener != null) {    onItemClickListener.onItemClick(list.get(position).getFileName());   }   }  });  if (position == selectedPos) {   holder.ivCheck.setVisibility(View.VISIBLE);  } else {   holder.ivCheck.setVisibility(View.GONE);  }  holder.tvCount.setText(list.get(position).getCount() + "张");  holder.tvName.setText(list.get(position).getFileName());  Glide.with(context).load("file://" + list.get(position).getFirstPicPath()).into(holder.iv);  }   @Override  public int getItemCount() {  return list.size();  }   public class NViewHolder extends RecyclerView.ViewHolder {  @BindView(R.id.iv_itemGallery)  ImageView iv;  @BindView(R.id.tv_itemGallery_name)  TextView tvName;  @BindView(R.id.tv_itemGallery_count)  TextView tvCount;  @BindView(R.id.iv_itemGallery_check)  ImageView ivCheck;   public NViewHolder(View itemView) {   super(itemView);   ButterKnife.bind(this, itemView);  }  }  } 

Glide.with(this).load("file://" + listSelectedPath.get(i)).asBitmap().into(new SimpleTarget<Bitmap>() {    @Override    public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {     Log.i(TAG, "onResourceReady: " + resource);    }    }); 

//添加apt插件  classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'