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Android图片上传实现预览效果

︶ㄣSDDLL学院 メ
SDDLL学院V管理员 / 阅读
0723
这篇文章主要介绍了Android图片上传实现预览效果的相关资料,需要的朋友可以参考下

这篇文章主要介绍了Android图片上传实现预览效果的相关资料,需要的朋友可以参考下

首先具体分析一下，实现的功能，其中需求分析是必不可少的，需求、逻辑清除之后，再上手写代码，思路会很清晰。

1.多图上传首先得选择图片（这里项目需求是既可以拍照上传也可以从相册中选择）

2.拍照上传很简单了网上也有很多例子，调用照相机，返回uri，获取图片

3.从相册中选择图片

  •  3.1 获取手机中的所有图片
  •  3.2 将图片存到自定义图片数组中显示
  •  3.3 自定义viewpager浏览图片

主要的逻辑大体是这样，下面具体看一下实现：

一、首先看一下界面：

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<com.view.noscrollgridview
          android:id="@+id/noscrollgridview"
          android:layout_marginleft="@dimen/smaller_space"
          android:layout_marginright="@dimen/smaller_space"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:horizontalspacing="3dp"
          android:listselector="@color/transparent"
          android:numcolumns="3"
          android:scrollbars="none"
          android:layout_gravity="center"
          android:layout_margintop="@dimen/smaller_space"
          android:verticalspacing="5dp" />

是一个 noscrollgridview，项目需要，所以用了不滚动的gridview，大家用gridview也是一样的。

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noscrollgridview = (gridview) findviewbyid(r.id.noscrollgridview);
    noscrollgridview.setselector(new colordrawable(color.transparent));
    /*新建传值给adapter*/
    if (file == null) {
      picadapter = new pictureadapter(this, 0, null);
    } else {
      //添加失败的图片到数组中
      for (int i=0;i<file.getmulfailfilepaths().length;i++){
        imageitem imageitem = new imageitem();
        imageitem.setimagepath(file.getmulfailfilepaths()[i].trim());
        bimp.tempselectbitmap.add(imageitem);
      }
      /*上传失败传值给adapter*/
      picadapter = new pictureadapter(this, 2, file);
    }

这个是初始化图片数组，适配器（新建、上传失败、上传成功的图片我用的都是一个adapter）

imageitem是图片的模型，下面有它的属性

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//从图库选择的图片model
public class imageitem extends file implements serializable {
  @id
  public string imageid; //图片id
  public string thumbnailpath; 
  public string imagepath; //图片路径
  private bitmap bitmap; 
  public boolean isselected = false;
   
  public string getimageid() {
    return imageid;
  }
  public void setimageid(string imageid) {
    this.imageid = imageid;
  }
  public string getthumbnailpath() {
    return thumbnailpath;
  }
  public void setthumbnailpath(string thumbnailpath) {
    this.thumbnailpath = thumbnailpath;
  }
  public string getimagepath() {
    return imagepath;
  }
  public void setimagepath(string imagepath) {
    this.imagepath = imagepath;
  }
  public boolean isselected() {
    return isselected;
  }
  public void setselected(boolean isselected) {
    this.isselected = isselected;
  }
[java] view plain copy print?
/*根据图片路径获取图片的bitmap*/
public bitmap getbitmap() {     
  if(bitmap == null){
    try {
      bitmap = bimp.revitionimagesize(imagepath);
    } catch (ioexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
    }
  }
  return bitmap;
}
public void setbitmap(bitmap bitmap) {
  this.bitmap = bitmap;
}

 接下来是适配器：

由于涉及到添加图片，adapter中添加一个flag用来显示新建的图片，将选择的图片添加到公有的图片数组中，初始化的时候加载图片数组显示。（大家在看的时候可以忽略掉我的flag）

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@suppresslint("handlerleak")
public class pictureadapter extends baseadapter {
  private layoutinflater inflater;
  private int selectedposition = -1;
  private boolean shape;
  private int flag = 0;//0 默认新建 1上传成功 2上传失败
  private appitem_file file;
  public boolean isshape() {
    return shape;
  }
  private activity context;
 
  public void setshape(boolean shape) {
    this.shape = shape;
  }
 
  public pictureadapter(activity context,int flag,appitem_file file) {
    this.context = context;
    inflater = layoutinflater.from(context);
    this.flag = flag;
    this.file = file;
  }
 
//  public void update() {
//    loading();
//  }
 
  public int getcount() {
    if (flag==0){  //新建图片
      if (bimp.tempselectbitmap.size() == 6) {
        return 6;
      }
      return (bimp.tempselectbitmap.size() + 1);
    }
    else if (flag==1){ //上传成功
      return file.getfilelist().size();
    }
    else { //上传失败
      return file.getmulfailfilepaths().length;
    }
 
  }
 
 
 
  public object getitem(int arg0) {
    if (flag==1){
      return file.getfilelist().get(arg0);
    }else {
      return file.getmulfailfilepaths()[arg0];
    }
  }
 
  public long getitemid(int arg0) {
    return arg0;
  }
 
  public void setselectedposition(int position) {
    selectedposition = position;
  }
 
  public int getselectedposition() {
    return selectedposition;
  }
 
  public view getview(int position, view convertview, viewgroup parent) {
    viewholder holder = null;
    if (convertview == null) {
      //根据图片的数量加载不同布局
      if (getcount()==1&&flag!=0){
        convertview = inflater.inflate(r.layout.item_published_singal_item,
            parent, false);
      }
      else {
        convertview = inflater.inflate(r.layout.item_published_grida,
            parent, false);
      }
 
      holder = new viewholder();
      holder.image = (imageview) convertview
          .findviewbyid(r.id.item_grida_image);
      convertview.settag(holder);
    } else {
      holder = (viewholder) convertview.gettag();
    }
 
    /**
     * 根据初始化adapter传过来的flag值，去不同的地方找图片
     * flag=0，去bimp的图片数组中找
     * flag=1，证明上传成功的，去下载好的getfilelist中找
     * flag=2，为上传失败的，图片保存在failfile中的list<imageitem>中
     * 优化图片显示
     */
    if (flag==0){  //新建图片
      if (position == bimp.tempselectbitmap.size()) {
        holder.image.setimagebitmap(bitmapfactory.decoderesource(
            convertview.getresources(), r.drawable.icon_add_pic_unfocused));
        if (position == 6) {
          if (flag==0){
            holder.image.setvisibility(view.gone);
          }
        }
      } else {
        holder.image.setimagebitmap(bimp.tempselectbitmap.get(position).getbitmap());
      }
    }
    else if (flag==1){ //上传成功
//      list<integer> ids = new arraylist<integer>();
//      for (int i=0;i<file.getfilelist().size();i++){
//        ids.add(file.getfilelist().get(i).gets_id());
//      }
      int id=file.getfilelist().get(position).gets_id();
      try {
//        file file= needapplication.db.findbyid(file.class,id);
        string filebigimguri =needapplication.db.findbyid(file.class,id).getfileuribig();
        if (filebigimguri!=null&&!"null".equals(filebigimguri))
        imageloader.getinstance().displayimage((filebigimguri).trim(),holder.image);
      } catch (dbexception e) {
        e.printstacktrace();
      }
    }
    else { //上传失败
        string url = "file://"+file.getmulfailfilepaths()[position].trim();
        imageloader.getinstance().displayimage(url, holder.image);
    }
 
 
    return convertview;
  }
 
  public class viewholder {
    public imageview image;
  }
 
}

 下面是自定义相册界面，用来选择图片的

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<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#e1e0de"
  >
 
  <relativelayout
    android:id="@+id/headview"
    android:layout_width="fill_parent"
    android:layout_height="45dp"
    android:background="@drawable/plugin_camera_title_bar"
    android:gravity="center_vertical"
    android:layout_marginbottom="3dp"
    >
    <button
      android:layout_width="60dp"
      android:layout_height="wrap_content"
      android:textsize="14sp"
      android:textcolor="#fff"
      android:id="@+id/back"
      android:text="相册"
      android:background="@drawable/plugin_camera_title_btn_back"
      android:layout_margintop="5dp"
      android:layout_marginbottom="5dp"
      android:layout_centervertical="true"
      />
    <button
      android:layout_width="67dp"
      android:layout_height="wrap_content"
      android:textsize="14sp"
      android:textcolor="#fff"
      android:id="@+id/cancel"
      android:text="取消"
      android:background="@drawable/plugin_camera_title_btn_cancel"
      android:layout_centervertical="true"
      android:layout_marginright="5dp"
      android:layout_alignparentright="true"
      />
  </relativelayout>
 
  <relativelayout
    android:id="@+id/bottom_layout"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_alignparentbottom="true"
    android:background="@drawable/plugin_camera_bottom_bar"
    android:layout_margintop="3dp"
    >
    <button
      android:id="@+id/preview"
      android:layout_width="90dp"
      android:layout_height="wrap_content"
      android:layout_alignparentleft="true"
      android:layout_centervertical="true"
      android:layout_marginleft="10dp"
      android:text="预览"
      android:background="@drawable/plugin_camera_title_btn_preview"
      />
    <button
      android:id="@+id/ok_button"
      android:layout_width="90dp"
      android:layout_height="wrap_content"
      android:layout_alignparentright="true"
      android:layout_centervertical="true"
      android:layout_marginright="10dp"
      android:background="@drawable/plugin_camera_ok_btn_state"
      />
  </relativelayout>
 
  <gridview
    android:id="@+id/mygrid"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@id/bottom_layout"
    android:layout_below="@id/headview"
    android:layout_centerinparent="true"
    android:layout_margintop="2dp"
    android:horizontalspacing="10dp"
    android:numcolumns="4"
    android:verticalspacing="10dp"
    android:background="#e1e0de" />
  <textview
    android:id="@+id/mytext"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:text="相册没有图片"
    android:textcolor="@color/black"
    />
 
</relativelayout>

 同样也是用了gridview，获取手机中的图片，添加到数组中，显示

这里用到了一个albumhelper（相册帮助类），网上找的代码，感觉挺好的

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public list<imagebucket> getimagesbucketlist(boolean refresh) {
    if (refresh || (!refresh && !hasbuildimagesbucketlist)) {
      buildimagesbucketlist();
    }
    list<imagebucket> tmplist = new arraylist<imagebucket>();
    iterator<entry<string, imagebucket>> itr = bucketlist.entryset()
        .iterator();
    while (itr.hasnext()) {
      entry<string, imagebucket> entry = (entry<string, imagebucket>) itr
          .next();
      tmplist.add(entry.getvalue());
    }
    return tmplist;
  }

获取到数据源之后，该显示了，也就是利用的获取图片帮助类里面的方法

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// 初始化，给一些对象赋值
  private void init() {
    helper = albumhelper.gethelper();
    helper.init(getapplicationcontext());
     
    contentlist = helper.getimagesbucketlist(false);
    datalist = new arraylist<imageitem>();
    for(int i = 0; i<contentlist.size(); i++){
      datalist.addall( contentlist.get(i).imagelist );
    }
     
    back = (button) findviewbyid(r.id.back);
    cancel = (button) findviewbyid(r.id.cancel);
    cancel.setonclicklistener(new cancellistener());
    back.setonclicklistener(new backlistener());
    preview = (button) findviewbyid(r.id.preview);
    preview.setonclicklistener(new previewlistener());
    intent = getintent();
    bundle bundle = intent.getextras();
    gridview = (gridview) findviewbyid(r.id.mygrid);
    gridimageadapter = new albumgridviewadapter(mcontext,datalist,bimp.tempselectbitmap);
    gridview.setadapter(gridimageadapter);
    tv = (textview) findviewbyid(r.id.mytext);
    gridview.setemptyview(tv);
    okbutton = (button) findviewbyid(r.id.ok_button);
    okbutton.settext("完成"+"(" + bimp.tempselectbitmap.size()
        + "/"+ needapplication.picnums+")");
  }
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gridimageadapter
        .setonitemclicklistener(new albumgridviewadapter.onitemclicklistener() {
 
          @override
          public void onitemclick(final togglebutton togglebutton,
              int position, boolean ischecked,button choosebt) {
            if (bimp.tempselectbitmap.size() >= needapplication.picnums) {
              togglebutton.setchecked(false);
              choosebt.setvisibility(view.gone);
              if (!removeonedata(datalist.get(position))) {
                toast.maketext(albumactivity.this, "超出可选图片张数", toast.length_short).show();
              }
              return;
            }
            if (ischecked) {
              choosebt.setvisibility(view.visible);
              bimp.tempselectbitmap.add(datalist.get(position));
              okbutton.settext("完成"+"(" + bimp.tempselectbitmap.size()
                  + "/"+ needapplication.picnums+")");
            } else {
              bimp.tempselectbitmap.remove(datalist.get(position));
              choosebt.setvisibility(view.gone);
              okbutton.settext("完成"+"(" + bimp.tempselectbitmap.size() + "/"+ needapplication.picnums+")");
            }
            isshowokbt();
          }
        });

点击图片选择加到公有图片数组中显示已选择。

最后是预览图片，利用自定义viewpager，实现图片滑动，下面贴两张截图吧：

Android图片上传实现预览效果

以上就是本文的全部内容，希望对大家的学习有所帮助。