【发布时间】：2017-09-12 16:03:47
【问题描述】：
我的应用程序向局域网中的其他设备发送了一些文本和图像。看起来图像已成功传输和接收（我根本没有任何异常），但不知何故，某些图像在 CardViewAdapter 的 imageView 中显示不好或根本没有显示。
当我收到图像时，我创建文件并使用 createFile 方法保存它。我还传输图像类型并使用此扩展名保存它。我不知道它取决于什么，但我无法解决它。
通过 tcp 发送图像的类：
public class ImageTransferHandler implements Runnable{
private static final String TAG = "ImageTransferHandler";
private static final int SERVER_PORT = 8700;
private Socket socket;
private Context context;
private String hostIpAddress;
private Bar bar;
public ClientThreadProcessor(String hostIpAddress, Context context, Bar bar){
this.context = context;
this.hostIpAddress = hostIpAddress;
this.Bar = bar;
}
private Socket getSocket(String hostIpAddress) {
InetAddress serverAddr = InetAddress.getByName(hostIpAddress);
socket = new Socket(serverAddr, SERVER_PORT);
return socket;
}
private void closeSocket(Socket socket) {
socket.close();
}
@Override
public void run() {
socket = getSocket(hostIpAddress);
OutputStream outputStream = socket.getOutputStream();
PrintWriter output = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(outputStream)), true);
output.println(bar.getImageInfo().isCamera());
Uri imageUri = Uri.parse(bar.getImageInfo().getPath());
String mimeType = ImagePicker.getMimeType(context, imageUri);
String ext = mimeType.substring(mimeType.lastIndexOf("/") + 1);
if(ext == null) ext = "bmp";
output.println(ext);
BufferedOutputStream bout = new BufferedOutputStream(outputStream);
String realPath = ImagePicker.getRealPathFromUri(context, imageUri);
InputStream input = new FileInputStream(realPath);
byte[] buffer = new byte[1024];
int len;
while ((len = input.read(buffer)) != -1) {
bout.write(buffer);
}
input.close();
bout.close();
Log.d(TAG, "Image sent over network and stream is closed.");
output.close();
closeSocket(socket);
}
}
通过 tcp 接收图像的类
public class ImageReceiveHandler implements Runnable{
private static String TAG = "ImageReceiveHandler";
private Socket socket;
private Context context;
private BufferedReader inputBufferedReader;
private PrintWriter outputPrintWriter;
private Bar Bar;
public ClientHandler(Socket socket, Context context){
this.socket = socket;
this.context = context;
}
@Override
public void run() {
InputStream input = socket.getInputStream();
inputBufferedReader = new BufferedReader(
new InputStreamReader(input));
outputPrintWriter = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())), true);
boolean isCamera = Boolean.valueOf(inputBufferedReader.readLine());
String ext = inputBufferedReader.readLine();
File imageFile = ImagePicker.createFile(context, ImagePicker.isExternalStorageWritable(), ext);
if (imageFile != null) {
Uri imageUri = Uri.fromFile(imageFile);
Log.d(TAG, "imageUri for received image: " + imageUri.toString());
BufferedInputStream bufin = null;
FileOutputStream output = null;
bufin = new BufferedInputStream(input);
output = new FileOutputStream(imageFile);
byte[] buffer = new byte[1024];
int len;
while((len = bufin.read(buffer)) != -1){
output.write(buffer);
output.flush();
}
output.close();
bufin.close();
Log.d(TAG, "Image is received and saved. File length: " + imageFile.length());
ImageInfo info = new ImageInfo(imageUri.toString(), isCamera);
Bar = new Bar(info);
addNotification(Bar, hostAddress);
}
else
Log.d(TAG, "ImagePicker.createFile returns NULL");
inputBufferedReader.close();
outputPrintWriter.close();
}
public File createFile(Context context, boolean external, String ext) {
File direct;
if(external)
direct = new File(Environment.getExternalStorageDirectory() + "/myo_images");
else
direct = new File(context.getFilesDir() + "/myo_images");
if (!direct.exists()) {
File imagesDir;
if(external)
imagesDir = new File("/sdcard/myo_images/");
else
imagesDir = new File("/myo_images");
imagesDir.mkdirs();
}
String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File file = null;
if(external)
file = File.createTempFile("myo_" + timestamp, "." + ext, direct);
else
file = File.createTempFile("myo_" + timestamp, "." + ext, direct);
return file;
}
}
应该可视化图像的适配器类
public class BarsCardViewAdapter extends RecyclerView.Adapter<BarsCardViewAdapter.CardViewHolder> {
private List<BarData> activeBars;
private final static String TAG = "CARDVIEW_ADAPTER";
public BarsCardViewAdapter(List<BarData> Bars){
activeBars = Bars;
}
public static class CardViewHolder extends RecyclerView.ViewHolder {
private ActiveBarsListItemBinding listItemBinding;
public CardViewHolder(View v) {
super(v);
listItemBinding = DataBindingUtil.bind(v);
}
public ActiveBarsListItemBinding getBinding(){
return listItemBinding;
}
}
@Override
public BarsCardViewAdapter.CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.bars_list_item, parent, false);
CardViewHolder holder = new CardViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(final BarsCardViewAdapter.CardViewHolder holder, final int position) {
holder.getBinding().imageView.setVisibility(View.GONE);
final Bar bar = activeBars.get(position);
final ImageInfo imageInfo = bar.getImageInfo();
final LinearLayout rLayout = holder.getBinding().listItemLayout;
ImageInfo imageInfo = BarData.getImageInfo();
Log.d(TAG, "imagePath: " + Uri.parse(imageInfo.getPath()));
holder.getBinding().imageView.setVisibility(View.VISIBLE);
Picasso.with(rLayout.getContext()).
load(imageInfo.getPath()).
transform(new CropSquareTransformation()).
into(holder.getBinding().imageView);
holder.getBinding().setVariable(BR.Bar, bar);
holder.getBinding().executePendingBindings();
}
@Override
public int getItemCount() {
return activeBars.size();
}
}
【问题讨论】：
-
您只能从 inputBufferedReader 中读取一行。只有一个分机。但是那个缓冲的阅读器将缓冲比那条线更多的东西。它也会缓冲很多图像。但是您将缓冲区扔掉并尝试从新输入中读取图像。那不行。
-
我删除了不必要的部分，但事实上我还在“ext”之前发送了一些其他文本。我应该如何使用流来正确发送文本和后图像？如何避免在 BufferedReader 中缓冲图像数据？谢谢
-
不要使用阅读器是你发送文本和图像。只需使用 DataInputStream.@
-
请阅读Under what circumstances may I add “urgent” or other similar phrases to my question, in order to obtain faster answers? - 总结是这不是解决志愿者的理想方式，并且可能会适得其反。请不要将此添加到您的问题中。
-
@greenapps 谢谢，请看下面我的回答。
标签： java android image imageview