我有三项活动：MainActivity, DownloadServiceTest, ViewDetailDownload。现在，我想使用Service（IntentService）下载文件。
肉体：
MainActivity有按钮。当我点击 button_1 时，启动服务（DownloadServiceTestextends IntentSerive）执行下载，我想点击button_2时会启动ViewDetailDownload并更新进度。
但是，当我开始ViewDetailDownload时，我无法从DownloadServiceTest
我的代码在这里。
类MainActivity：
public class MainActivity extends Activity implements OnClickListener {
private final String LINK_MP3 = "http://data.chiasenhac.com/downloads/1471/5/1470643-c6ef1a26/320/Vo%20Hinh%20Trong%20Tim%20Em%20-%20Mr%20Siro%20%5BMP3%20320kbps%5D.mp3";
Activity activity;
Button btnDownload_1, btnDownload_2, btnDownload_3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_control);
activity = MainActivity.this;
btnDownload_1 = (Button) findViewById(R.id.btn_startdownload_1);
btnDownload_2 = (Button) findViewById(R.id.btn_startdownload_2);
btnDownload_3 = (Button) findViewById(R.id.btn_startdownload_3);
btnDownload_1.setOnClickListener(this);
btnDownload_2.setOnClickListener(this);
btnDownload_3.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.btn_startdownload_1) {
Intent intent = new Intent(activity, DownloadServiceTest.class);
intent.putExtra(DownloadServiceTest.REQUEST_STRING, LINK_MP3);
startService(intent);
}
if (v.getId() == R.id.btn_startdownload_2) {
Intent intent = new Intent(MainActivity.this,
ViewDetailDownload.class);
startActivity(intent);
}
}
}
class DownloadServiceTest：
public class DownloadServiceTest extends IntentService {
public static final String REQUEST_STRING = "REQUEST_LINK";
public static final String PROGRESS_UPDATE_ACTION = DownloadServiceTest.class
.getName() + ".progress_update";
private LocalBroadcastManager mLocalBroadcastManager;
private String mUrl_mp3;
public DownloadServiceTest(String name) {
super(name);
}
public DownloadServiceTest() {
super("DownloadService");
}
@Override
public void onCreate() {
mLocalBroadcastManager = LocalBroadcastManager
.getInstance(DownloadServiceTest.this);
super.onCreate();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
protected void onHandleIntent(Intent intent) {
mUrl_mp3 = intent.getStringExtra(REQUEST_STRING);
DownloadTask task = new DownloadTask();
if (mUrl_mp3 != null) {
task.execute(mUrl_mp3);
}
}
private void onProgressUpdateReceiver(int progress, int speed) {
Intent intent = new Intent();
intent.setAction(PROGRESS_UPDATE_ACTION);
intent.putExtra("progress", progress);
intent.putExtra("speed", speed);
Log.i("", "abc onProgressUpdateReceiver progress "+progress);
Log.i("", "abc onProgressUpdateReceiver speed "+speed);
mLocalBroadcastManager.sendBroadcast(intent);
}
private class DownloadTask extends AsyncTask<String, Void, Void> {
String filename;
int mProgress;
int mSpeed;
private int checkExist;
File SDCardRoot;
private FileOutputStream fileOut;
private InputStream fileIn;
File file;
@Override
protected void onPreExecute() {
filename = mUrl_mp3.substring(mUrl_mp3.lastIndexOf("/") + 1);
try {
filename = URLDecoder.decode(filename, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
super.onPreExecute();
}
@Override
protected Void doInBackground(String... params) {
int contentLengh = 0;
try {
URL url = new URL(params[0]);
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
if (HttpURLConnection.HTTP_OK == urlConnection
.getResponseCode()) {
contentLengh = urlConnection.getContentLength();
Log.i("", "abc " + contentLengh);
fileIn = urlConnection.getInputStream();
SDCardRoot = Environment.getExternalStorageDirectory();
file = new File(Environment.getExternalStorageDirectory()
+ "/Blog Radio");
boolean success = true;
if (!file.exists()) {
success = file.mkdir();
}
String getTypeFile = filename.substring(filename
.indexOf("."));
if (success) {
file = new File(SDCardRoot.getAbsolutePath()
+ "/Blog Radio/" + filename);
if (file.exists()) {
checkExist++;
String PATH = Environment
.getExternalStorageDirectory()
+ "/Blog Radio/"
+ filename.replace(filename
.substring(filename.indexOf(".")),
"")
+ "_"
+ checkExist
+ getTypeFile;
file = new File(PATH);
}
} else {
file = new File(SDCardRoot.getAbsolutePath()
+ "/Blog Radio/" + filename);
if (file.exists()) {
checkExist++;
String PATH = Environment
.getExternalStorageDirectory()
+ "/Blog Radio/"
+ filename.replace(filename
.substring(filename.indexOf(".")),
"")
+ "_"
+ checkExist
+ getTypeFile;
file = new File(PATH);
}
}
fileOut = new FileOutputStream(file);
int downloadSize = 0;
byte[] buffer = new byte[8192];
long tempTotal = 0;
long startTime = System.currentTimeMillis();
int bufferLengh = 0;
while ((bufferLengh = fileIn.read(buffer)) != -1) {
long interval = System.currentTimeMillis() - startTime;
if (isCancelled()) {
fileIn.close();
}
if (contentLengh > 0) {
downloadSize += bufferLengh;
tempTotal += bufferLengh;
mProgress = (int) ((downloadSize * 100L) / contentLengh);
if (interval >= 1000) {
Log.i("now = ", String.valueOf(System
.currentTimeMillis()));
Log.i("last = ", String.valueOf(startTime));
Log.i("currentDump = ",
String.valueOf(tempTotal));
mSpeed = (int) (tempTotal * 1000 / interval / 1024);
startTime = System.currentTimeMillis();
tempTotal = 0;
}
fileOut.write(buffer, 0, bufferLengh);
onProgressUpdateReceiver(mProgress, mSpeed);
}
}
fileOut.flush();
fileOut.close();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
}
类ViewDetailDownload：
public class ViewDetailDownload extends Activity {
TextView tv_Title, tv_Info;
ProgressBar progressBar;
ImageView img;
MyRequestReceiver receiver;
IntentFilter intentToReceiveFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.download_service_layout);
img = (ImageView) findViewById(R.id.img);
tv_Title = (TextView) findViewById(R.id.title);
tv_Info = (TextView) findViewById(R.id.info);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
intentToReceiveFilter = new IntentFilter();
intentToReceiveFilter
.addAction(DownloadServiceTest.PROGRESS_UPDATE_ACTION);
receiver = new MyRequestReceiver();
}
@Override
protected void onResume() {
registerReceiver();
super.onResume();
}
private void registerReceiver() {
this.registerReceiver(receiver, intentToReceiveFilter);
}
@Override
protected void onPause() {
unregisterReceiver();
super.onPause();
}
protected void onProgressUpdate(int progress, int speed) {
progressBar.setProgress(progress);
tv_Info.setText(speed);
}
protected void onProgressUpdateOneShot(int progresses, int speeds) {
int progress = progresses;
int speed = speeds;
onProgressUpdate(progress, speed);
}
private void unregisterReceiver() {
this.unregisterReceiver(receiver);
}
public class MyRequestReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(
DownloadServiceTest.PROGRESS_UPDATE_ACTION)) {
int progresses = intent.getIntExtra("progress", -1);
int speeds = intent.getIntExtra("speed", -1);
Log.i("", "abc progresses onReceive" + progresses);
Log.i("", "abc speeds onReceive" + speeds);
onProgressUpdateOneShot(progresses, speeds);
}
}
}
}
我需要帮助！ 如果你知道......请举例。 谢谢大家
答案 0 :(得分：1)
在onCreate（）方法的DownloadServiceTest.java中添加。
Intent iin= getIntent();
Bundle b = iin.getExtras();
if(b!=null)
{
String mname =(String) b.getString("LINK_MP3");
}
现在，您可以在DownloadServiceTest
中的任何位置使用此字符串mname