Mega Code Archive
Progress of AsyncTask
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package app.test;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
class CustomHttpClient {
private static HttpClient customHttpClient;
public static synchronized HttpClient getHttpClient() {
if (customHttpClient != null) {
return customHttpClient;
}
HttpParams params = new BasicHttpParams();
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setContentCharset(params,
HTTP.DEFAULT_CONTENT_CHARSET);
HttpProtocolParams.setUseExpectContinue(params, true);
ConnManagerParams.setTimeout(params, 1000);
HttpConnectionParams.setConnectionTimeout(params, 5000);
HttpConnectionParams.setSoTimeout(params, 10000);
SchemeRegistry schReg = new SchemeRegistry();
schReg.register(new Scheme("http", PlainSocketFactory
.getSocketFactory(), 80));
schReg.register(new Scheme("https",
SSLSocketFactory.getSocketFactory(), 443));
ClientConnectionManager conMgr = new ThreadSafeClientConnManager(
params, schReg);
customHttpClient = new DefaultHttpClient(conMgr, params);
return customHttpClient;
}
}
class DownloadImageTask extends AsyncTask<String, Integer, Bitmap> {
Context mContext;
int progress = -1;
Bitmap downloadedImage = null;
DownloadImageTask(Context context) {
mContext = context;
}
protected void setContext(Context context) {
mContext = context;
if (progress >= 0) {
publishProgress(this.progress);
}
}
protected void onPreExecute() {
progress = 0;
}
protected Bitmap doInBackground(String... urls) {
Log.v("doInBackground", "doing download of image...");
return downloadImage(urls);
}
protected void onProgressUpdate(Integer... progress) {
Log.v("onProgressUpdate", "Progress so far: " + progress[0]);
}
protected void onPostExecute(Bitmap result) {
if (result != null) {
downloadedImage = result;
setImageInView();
} else {
Log.v("onPostExecute",
"Problem downloading image. Please try later.");
}
}
public Bitmap downloadImage(String... urls) {
HttpClient httpClient = CustomHttpClient.getHttpClient();
try {
HttpGet request = new HttpGet(urls[0]);
HttpParams params = new BasicHttpParams();
HttpConnectionParams.setSoTimeout(params, 60000); // 1 minute
request.setParams(params);
HttpResponse response = httpClient.execute(request);
setProgress(50);
byte[] image = EntityUtils.toByteArray(response.getEntity());
setProgress(75);
Bitmap mBitmap = BitmapFactory.decodeByteArray(image, 0,
image.length);
setProgress(100);
return mBitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private void setProgress(int progress) {
this.progress = progress;
publishProgress(this.progress);
}
protected void setImageInView() {
if (downloadedImage != null) {
ImageView mImage = (ImageView) ((Activity) mContext)
.findViewById(R.id.image);
mImage.setImageBitmap(downloadedImage);
}
}
private void sleepFor(long msecs) {
try {
Thread.sleep(msecs);
} catch (InterruptedException e) {
Log.v("sleep", "interrupted");
}
}
}
public class Test extends Activity {
private DownloadImageTask diTask;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if ((diTask = (DownloadImageTask) getLastNonConfigurationInstance()) != null) {
diTask.setContext(this);
if (diTask.getStatus() == AsyncTask.Status.FINISHED)
diTask.setImageInView();
}
}
public void doClick(View view) {
if (diTask != null) {
AsyncTask.Status diStatus = diTask.getStatus();
Log.v("doClick", "diTask status is " + diStatus);
if (diStatus != AsyncTask.Status.FINISHED) {
Log.v("doClick", "... no need to start a new task");
return;
}
}
diTask = new DownloadImageTask(this);
diTask.execute("http://aBigFile");
}
@Override
public Object onRetainNonConfigurationInstance() {
return diTask;
}
}
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