Aquery框架Ajax回调与AsyncTask 下载比较
获取url数据，最后进行播放的比较代码
AsynTask：
// Async Task Class
class DownloadMusicfromInternet extends AsyncTask<String,String,String> {
// Show Progress bar before downloading Music
@Override
protected void onPreExecute() {
super.onPreExecute();
// Shows Progress Bar Dialog and then call doInBackground method
showDialog(progress_bar_type);
}
// Download Music File from Internet
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// Get Music file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(),10*1024);
// Output stream to write file in SD card
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory().getPath()+"/jai_ho.mp3");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// Publish the progress which triggers onProgressUpdate method
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
// Write data to file
output.write(data,0,count);
}
// Flush output
output.flush();
// Close streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ",e.getMessage());
}
return null;
}
// While Downloading Music File
protected void onProgressUpdate(String... progress) {
// Set progress percentage
prgDialog.setProgress(Integer.parseInt(progress[0]));
}
// Once Music File is downloaded
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the Music file was downloaded
dismissDialog(progress_bar_type);
Toast.makeText(getApplicationContext(),"Download complete,playing Music",Toast.LENGTH_LONG).show();
// Play the music
playMusic();
}
}
Ajax回调：
aq.progress(prgDialog).download(url,target,new AjaxCallback<File>() {
// Once download is complete
public void callback(String url,File file,AjaxStatus status) {
// If file does exist
if (file != null) {
playMusic();
// If file doesn't exist display error message
} else {
Toast.makeText(aq.getContext(),"Error occured: Status" + status,Toast.LENGTH_SHORT).show();
}
}
});
- aq.download()方法中已经封装了处理逻辑，只需要开发者传入url，目标文件位置和最后回调处理对象即可
- aq.progress()传入ProgressBar对象，无需额外代码进行进度显示
- aquery采取链式调用，代码简洁
初始化组件的代码比较
AsyncTask:
// 初始化Button
btnPlayMusic = (Button) findViewById(R.id.btnProgressBar);
// Download Music Button click listener
btnPlayMusic.setonClickListener(new View.OnClickListener() {
// When Download Music Button is clicked
public void onClick(View v) {
// disable the button to avoid playing of song multiple times
btnPlayMusic.setEnabled(false);
// Downloaded Music File path in SD Card
File file = new File(Environment.getExternalStorageDirectory().getPath()+"/jai_ho.mp3");
// Check if the Music file already exists
if (file.exists()) {
Toast.makeText(getApplicationContext(),"File already exist under SD card,Toast.LENGTH_LONG).show();
// Play Music
playMusic();
// If the Music File doesn't exist in SD card (Not yet downloaded)
} else {
Toast.makeText(getApplicationContext(),"File doesn't exist under SD Card,downloading Mp3 from Internet",Toast.LENGTH_LONG).show();
// Trigger Async Task (onPreExecute method)
new DownloadMusicfromInternet().execute(file_url);
}
}
});
....
// 初始化ProgressDialog
prgDialog = new ProgressDialog(this);
prgDialog.setMessage("Downloading Mp3 file. Please wait...");
prgDialog.setIndeterminate(false);
prgDialog.setMax(100);
prgDialog.setProgressstyle(ProgressDialog.STYLE_HORIZONTAL);
prgDialog.setCancelable(false);
prgDialog.show();
AJAX回调：
// 初始化Button
// Instantiate AQuery object
aq = new AQuery(this);
// Look for button click event using AQuery clicked() method
aq.id(R.id.btnProgressBar).clicked(this,"downloadSongandplay");
....
// 初始化ProgressBar
prgDialog = new ProgressDialog(this); // Instantiate Progress Dialog Bar
prgDialog.setMessage("Downloading MP3 from Internet. Please wait..."); // Set Progress Dialog Bar message
prgDialog.setIndeterminate(false);
prgDialog.setMax(100); // Progress Bar max limit
prgDialog.setProgressstyle(ProgressDialog.STYLE_HORIZONTAL); // Progress Bar style
prgDialog.setCancelable(false); // Progress Bar cannot be cancelable
// display progress dialog bar and initiate download of Mp3 file
aq.progress(prgDialog);
播放音乐文件的代码，此处相同
protected void playMusic(){
// Read Mp3 file present under SD card
Uri myUri1 = Uri.parse("file:///sdcard/pgfolder/jai_ho.mp3");
mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mPlayer.setDataSource(aq.getContext(),myUri1);
mPlayer.prepare();
// Start playing the Music file
mPlayer.start();
mPlayer.setonCompletionListener(new OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
// Todo Auto-generated method stub
// Once Music is completed playing,enable the button
aq.id(R.id.btnProgressBar).enabled(true);
Toast.makeText(getApplicationContext(),"Music completed playing",Toast.LENGTH_LONG).show();
}
});
} catch (IllegalArgumentException e) {
Toast.makeText(getApplicationContext(),"You might not set the URI correctly!",Toast.LENGTH_LONG).show();
} catch (SecurityException e) {
Toast.makeText(getApplicationContext(),"URI cannot be accessed,permissed needed",Toast.LENGTH_LONG).show();
} catch (IllegalStateException e) {
Toast.makeText(getApplicationContext(),"Media Player is not in correct state",Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(getApplicationContext(),"IO Error occured",Toast.LENGTH_LONG).show();
}
}
参考资料
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