接收圖像並使用tcp套接字顯示它？ （安卓）

Question

我如何接收圖像並通過帶有Android設備的tcp套接字顯示它？ 我嘗試了一些但不起作用。 我正在搜索一些示例以從PC發送圖像或文件並將其保存在手機上（android，java）

Answer 1

我使用類似的方法從URL下載圖像：
導入java.io.IOException; 導入java.io.InputStream; 導入java.net.HttpURLConnection; 導入java.net.URL; 導入java.net.URLConnection;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

public class AsyncDownloadImage extends AsyncTask<ImageView, Void, Bitmap> {

    private static final String TAG = "AsyncDownloadImage";
    ImageView imageView = null;

    @Override
    protected Bitmap doInBackground(ImageView... imageViews) {
        this.imageView = imageViews[0];
        return DownloadImage((String) imageView.getTag());
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        if (result != null)
            imageView.setImageBitmap(result);
    }

    private InputStream OpenHttpConnection(String urlString) throws IOException {
        InputStream in = null;
        int response = -1;

        URL url = new URL(urlString);
        URLConnection conn = url.openConnection();

        if (!(conn instanceof HttpURLConnection))
            throw new IOException("Not an HTTP connection");

        try {
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect();
            response = httpConn.getResponseCode();
            if (response == HttpURLConnection.HTTP_OK) {
                in = httpConn.getInputStream();
            }
        } catch (Exception ex) {
            throw new IOException("Error connecting");
        }
        return in;
    }

    private Bitmap DownloadImage(String URL) {
        Bitmap bitmap = null;
        InputStream in = null;
        try {
            in = OpenHttpConnection(URL);
            bitmap = BitmapFactory.decodeStream(in);
            if (in != null)
                in.close();
        } catch (IOException e1) {
            Log.e(TAG, "Error in downloading image");
            e1.printStackTrace();
        }
        return bitmap;
    }
}

我使用它的方式是在imageview的標簽中設置要下載的圖像的URL，並將ImageView作為參數傳遞。 例如。

ImageView iv.setTag("http://www.example.com/image.png");
new AsyncDownloadImage().execute(iv);

如果要使用套接字下載它，可以打開一個套接字連接，例如：

Socket socket = new Socket(ip, port);
InputStream inputStream = socket.getInputStream();