本文介绍了Android用RecyclerView实现动态添加本地图片，分享给大家，具体如下：

简单介绍一下用法：

1、跳转到图片选择页面：

Intent intent = new Intent(PassengerSetActivity.this, MultiImageSelectorActivity.class);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, true);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, 9);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, MultiImageSelectorActivity.MODE_SINGLE);

startActivityForResult(intent, 10001);//10001-->添加

2、通过onActivityResult获取信息：

final ArrayList paths = data.getStringArrayListExtra(MultiImageSelectorActivity.EXTRA_RESULT);

Bitmap bitmap = BitmapFactory.decodeFile(paths.get(0), DIY_dialog.getBitmapOption(4));

首先设置布局管理器为：

recyclerview.setLayoutManager(new GridLayoutManager(this, 3));

然后设置适配器(这里在代码里面有详细的注释)：

public class PassengerAdapter extends RecyclerView.Adapter {

private Context mContext;

private OnItemClickLitener listener;//点击事件接口

private ArrayList imageUrls;

private ImageFetcher imageFetcher;

private ViewHolder viewHolder;

private View view;

/**

* 在构造方法中传入图片地址的数据

* @param context

* @param imageUrls

*/

public PassengerAdapter(Context context, ArrayList imageUrls) {

this.mContext = context;

this.imageUrls = imageUrls;

//初始化加载网络图片的jar包

imageFetcher = new ImageFetcher(context);

imageFetcher.setImageCache(ImageCache.getInstance(context));

}

@Override

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

view = LayoutInflater.from(mContext).inflate(R.layout.lay_passager, null);

viewHolder = new ViewHolder(view);

return viewHolder;

}

@Override

public void onBindViewHolder(ViewHolder holder, int position) {

//设置内容为“hehe”的的元素为默认的添加按钮

if (imageUrls.get(position).equals("hehe")) {

holder.imageViewBig.setBackgroundResource(R.mipmap.add);

//当图片是添加按钮的时候隐藏删除按钮

holder.imageViewSmall.setVisibility(View.GONE);

} else {

holder.imageViewSmall.setVisibility(View.VISIBLE);

/**

* 判断图片路径是网络地址还是本地图片

* 设置路径之中包含“storage”的为本地图片

*/

if (imageUrls.get(position).contains("storage")) {

try {

File file = new File(imageUrls.get(position));

//将bitmap转化成drawable

Bitmap bmp = MediaStore.Images.Media.getBitmap(mContext.getContentResolver(), Uri.fromFile(file));

Drawable drawable =new BitmapDrawable(bmp);

//按比例扩大图片的size居中显示，使得图片长(宽)等于或大于View的长(宽)

holder.imageViewBig.setScaleType(ImageView.ScaleType.CENTER_CROP);

holder.imageViewBig.setImageBitmap(bmp);

} catch (IOException e) {

e.printStackTrace();

}

// holder.imageViewBig.setImageURI(Uri.parse(imageUrls.get(position)));

} else {

imageFetcher.loadImage(imageUrls.get(position), holder.imageViewBig, R.mipmap.touxiang);

}

}

}

@Override

public int getItemCount() {

return imageUrls.size();

}

public void setOnItemClickLitener(OnItemClickLitener listener) {

this.listener = listener;

}

public interface OnItemClickLitener {

void onBigClick(int position);

void onSmallClick(int position);

}

class ViewHolder extends RecyclerView.ViewHolder {

ImageView imageViewBig, imageViewSmall;

public ViewHolder(View itemView) {

super(itemView);

imageViewBig = (ImageView) itemView.findViewById(R.id.imageViewBig);

imageViewSmall = (ImageView) itemView.findViewById(R.id.imageViewSmall);

/**

*

* 因为元素是变化的，动态的，所以对点击事件的处理放在ViewHolder类里面，调用getposition()

* 可以获取到当前的元素位子

*/

imageViewBig.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int position = (Integer) v.getTag();

listener.onBigClick(getPosition());

}

});

imageViewSmall.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int position = (Integer) v.getTag();

listener.onSmallClick(getPosition());

}

});

}

}

}

recycler的布局文件

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@+id/lay_group"

android:layout_width="wrap_content"

android:layout_height="wrap_content">

android:id="@+id/imageViewBig"

android:layout_width="120dp"

android:layout_height="120dp"

android:background="@mipmap/background"

/>

android:id="@+id/imageViewSmall"

android:layout_width="20dp"

android:layout_height="20dp"

android:background="@mipmap/del"

android:layout_gravity="right"/>

配置recyclerview和设置点击事件

recyclerview = (RecyclerView) findViewById(R.id.recyclerview);

recyclerview.setLayoutManager(new GridLayoutManager(this, 3));

if(imageUrls.size()==0){

imageUrls.add("hehe");

}

passengerAdapter = new PassengerAdapter(this, imageUrls);

recyclerview.setAdapter(passengerAdapter);

passengerAdapter.setOnItemClickLitener(new PassengerAdapter.OnItemClickLitener() {

@Override

public void onBigClick(int position) {

Log.d(TAG, "onBigClick: "+passengerAdapter.getItemCount());

Log.d(TAG, "onBigClick: "+position);

if (position==imageUrls.size()-1) {

//添加本地相册图片，更新视图

Intent intent = new Intent(PassengerSetActivity.this, MultiImageSelectorActivity.class);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, true);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, 9);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, MultiImageSelectorActivity.MODE_SINGLE);

startActivityForResult(intent, 10001);//10001-->添加

} else {

Intent intent = new Intent(PassengerSetActivity.this, MultiImageSelectorActivity.class);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SHOW_CAMERA, true);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_COUNT, 9);

intent.putExtra(MultiImageSelectorActivity.EXTRA_SELECT_MODE, MultiImageSelectorActivity.MODE_SINGLE);

poss = position;

startActivityForResult(intent, 10002);//10002-->修改

//修改图片，更新视图

}

}

@Override

public void onSmallClick(int position) {

imageUrls.remove(position);

passengerAdapter.notifyItemRemoved(position);

//删除图片，更新视图

}

});

选择完图片后，进行ui更新的操作

/**

* 返回图片url,并上传七牛

*

* @param requestCode

* @param resultCode

* @param data

*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if(data!=null){

if (requestCode == 10001 || requestCode == 10002) {

final ArrayList paths = data.getStringArrayListExtra(MultiImageSelectorActivity.EXTRA_RESULT);

Bitmap bitmap = BitmapFactory.decodeFile(paths.get(0), DIY_dialog.getBitmapOption(4));

//添加图片

if (requestCode == 10001) {

//将添加的图片放在第一位

imageUrls.add(0,paths.get(0));

//更新第一个位置的图片

passengerAdapter.notifyItemInserted(0);

}

//修改图片

else if (requestCode == 10002&&imageUrls.size()>0) {

int pos = poss;

imageUrls.set(pos,paths.get(0));

passengerAdapter.notifyItemChanged(pos);

}

}

}

}

大概就是这样了，简单的说一下思路，就是在存储图片的list的最后一项添加一个具有不同标识的数据，当点击时对应的标识和该标识一致，则添加，反之为修改。使用recylerview可以直接更新有变化的子项，而不用更新全部子项，用户体验更好，性能也提高了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。