Android Open Source - UWWeather Web Fetch

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From Project

Back to project page UWWeather.

License

The source code is released under:

This software is hereby placed in the public domain. gdmalet Tue Mar 15 10:51:10 EDT 2011

Java Source Code

/**
 * //from w  w  w.  j av  a2s.c  o m
 */
package ca.uwaterloo.android.UWWeather;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.util.Log;
import android.widget.Toast;

/**
 * @author gdmalet
 *
 */
public class WebFetch {
    private static final String TAG = "WebFetch";
    
    /**
     * User-agent string to use when making requests. Should be filled using
     * {@link #prepareUserAgent(Context)} before making any other calls.
     */
    private static String sUserAgent = null;

    /**
     * {@link StatusLine} HTTP status code when no server error has occurred.
     */
    private static final int HTTP_STATUS_OK = 200;

    /**
     * Shared buffer used by {@link #getUrlContent(String)} when reading results
     * from an API request.
     */
    private static byte[] sBuffer = new byte[512];

    /**
     * Thrown when there were problems contacting the remote API server, either
     * because of a network error, or the server returned a bad status code.
     */
    public static class ApiException extends Exception {
      static final long serialVersionUID = 0;
        public ApiException(String detailMessage, Throwable throwable) {
            super(detailMessage, throwable);
        }

        public ApiException(String detailMessage) {
            super(detailMessage);
        }
    }

    /**
     * Prepare the internal User-Agent string for use. This requires a
     * {@link Context} to pull the package name and version number for this
     * application.
     */
    public static void prepareUserAgent(Context context) {
        try {
            // Read package name and version number from manifest
            PackageManager manager = context.getPackageManager();
            PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
            sUserAgent = String.format(context.getString(R.string.template_user_agent),
                    info.packageName, info.versionName);

        } catch(NameNotFoundException e) {
            Log.e(TAG, "Couldn't find package information in PackageManager", e);
        }
    }

    /**
     * Pull the raw text content of the given URL. This call blocks until the
     * operation has completed, and is synchronized because it uses a shared
     * buffer {@link #sBuffer}.
     *
     * @param url The exact URL to request.
     * @return The raw content returned by the server.
     * @throws ApiException If any connection or server error occurs.
     */
    // TODO synchronised ?
    protected static synchronized String getUrlContent(String url) throws ApiException {
        if (sUserAgent == null) {
            throw new ApiException("User-Agent string must be prepared");
        }
        
        // Create client and set our specific user-agent string
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(url);
        request.setHeader("User-Agent", sUserAgent);

        try {
            HttpResponse response = client.execute(request);

            // Check if server response is valid
            StatusLine status = response.getStatusLine();
            if (status.getStatusCode() != HTTP_STATUS_OK) {
                throw new ApiException("Invalid response from server: " +
                        status.toString());
            }

            // Pull content stream from response
            HttpEntity entity = response.getEntity();
            InputStream inputStream = entity.getContent();

            ByteArrayOutputStream content = new ByteArrayOutputStream();

            // Read response into a buffered stream
            int readBytes = 0;
            while ((readBytes = inputStream.read(sBuffer)) != -1) {
                content.write(sBuffer, 0, readBytes);
            }

            // Return result from buffered stream
            return new String(content.toByteArray());
        } catch (IOException e) {
            throw new ApiException("Problem communicating with API", e);
        }
    }
}

Java Source Code List

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