我正在开发一个Android应用程序，从Server下载.mp3。 单击下载按钮时，将出现ProgressBar，显示 屏幕上的百分比。
这很好用。现在我想通过使用ProgressBar显示通知
在后台进行下载任何人都可以帮我找到使用服务和建立通知的代码吗？谢谢
我的MainActivity.java代码：
public class MainActivity extends Activity {
final MediaPlayer mp=new MediaPlayer();
//---------------------
Clone c=new Clone();
//------------------
// button to show progress dialog
Button btnShowProgress;
// Progress Dialog
private ProgressDialog pDialog;
ImageView my_image;
// Progress dialog type (0 - for Horizontal progress bar)
public static final int progress_bar_type = 0;
// File url to download
private static String file_url = "http://www.eecindia.co.in/up/01%20-%20Pretham%20-%20Oruthikku%20Pinnil%20[Maango.me].mp3";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// show progress bar button
btnShowProgress = (Button) findViewById(R.id.btnProgressBar);
// Image view to show image after downloading
my_image = (ImageView) findViewById(R.id.my_image);
/**
* Show Progress bar click event
* */
btnShowProgress.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//----------------------------------------------
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Select The Extension To Download...");
builder.setItems(new CharSequence[]
{".mp3", ".mp4", ".txt", ".srt"},
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// The 'which' argument contains the index position
// of the selected item
switch (which) {
case 0:
/////////////////////////////////////////////////////////////////
File folder = new File(Environment.getExternalStorageDirectory().getPath() + "/Jithin's/");
if (!folder.exists()) {
try {
folder.mkdirs();
} catch (Exception e) {
e.printStackTrace();
System.out.println("Default Save Path Creation Error:" + folder);
}
}
c.setA(Environment.getExternalStorageDirectory().toString() + "/Jithin's/downloadedfile.mp3");
// starting new Async Task
new DownloadFileFromURL().execute(file_url);
/////////////////////////////////////////////////////////////
break;
case 1:
////////////////////////////////////////////////////////////
File folde = new File(Environment.getExternalStorageDirectory().getPath() + "/Jithin's/");
if (!folde.exists()) {
try {
folde.mkdirs();
} catch (Exception e) {
e.printStackTrace();
System.out.println("Default Save Path Creation Error:" + folde);
}
}
c.setA(Environment.getExternalStorageDirectory().toString() + "/Jithin's/downloadedfile.mp4");
// starting new Async Task
new DownloadFileFromURL().execute(file_url);
////////////////////////////////////////////////
break;
case 2:
File fold = new File(Environment.getExternalStorageDirectory().getPath() + "/Jithin's/");
if (!fold.exists()) {
try {
fold.mkdirs();
} catch (Exception e) {
e.printStackTrace();
System.out.println("Default Save Path Creation Error:" + fold);
}
}
c.setA(Environment.getExternalStorageDirectory().toString() + "/Jithin's/downloadedfile.txt");
// starting new Async Task
new DownloadFileFromURL().execute(file_url);
break;
case 3:
File fol = new File(Environment.getExternalStorageDirectory().getPath() + "/Jithin's/");
if (!fol.exists()) {
try {
fol.mkdirs();
} catch (Exception e) {
e.printStackTrace();
System.out.println("Default Save Path Creation Error:" + fol);
}
}
c.setA(Environment.getExternalStorageDirectory().toString() + "/Jithin's/downloadedfile.srt");
// starting new Async Task
new DownloadFileFromURL().execute(file_url);
break;
}
}
});
builder.create().show();
/////-------------------------------------
}
});
}
/**
* Showing Dialog
* */
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar_type:
pDialog = new ProgressDialog(this);
pDialog.setMessage("Downloading File. Please Wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(false);
pDialog.show();
return pDialog;
default:
return null;
}
}
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
/**
* Downloading file in background thread
*/
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
// 6yi7 conection.connect();
conection.setRequestProperty("Accept-Encoding", "identity");
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
// Output stream to write file
OutputStream output = new FileOutputStream(c.getA());
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
*/
protected void onProgressUpdate(String... progress) {
// setting progress percentage
try {
pDialog.setProgress(Integer.parseInt(progress[0]));
} catch (Exception d) {
Log.d("Error .. ", d.getMessage());
}
}
/**
* After completing background task
* Dismiss the progress dialog
**/
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
dismissDialog(progress_bar_type);
Toast.makeText(MainActivity.this, "Downloaded Succesfully.. check Jithin's folder 2 see file...", Toast.LENGTH_LONG).show();
//my_image.setImageDrawable(Drawable.createFromPath(imagePath));
}
}
//---------------------------------
protected void onStop(){
super.onStop();
Intent intent = new Intent(MainActivity.this,MyService.class);
startService(intent);
}
}