Android图片上传实现预览效果

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：

<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。

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

//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）

@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

<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

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

// 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+")"); 
  } 

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：

以上就是本文的全部内容，希望对大家的学习有所帮助。