1
我知道很多問題都被問到這個問題，但沒有人可以回答我的具體問題，或者我沒有認出正確的答覆！返回到下載活動通知欄
就像在Android Market下載通知欄中的活動和進度欄中的進度欄文件期間一樣，單擊通知進度欄返回到原始活動，並且進度條更新爲下載進度。
我正在使用AsyncTask進行下載並創建&更新通知欄一切正常，但是當我點擊通知時，它將我返回到同一活動，但沒有任何數據或進度條（空白活動）換句話說，它開始新的活動並放棄額外活動和所有字段數據，包括活動進度條狀態。
我試着玩旗幟和意圖，但沒有得到我原來的活動加載時單擊通知欄特別是當回到其他活動，然後去主屏幕，然後按通知欄。
我運行下載方式：
df = new AsyncDownloadTask();
df.execute(m_item.getiid(),m_item.getipackage());
和片段（我改變了通知欄只是爲了顯示進度文本）：
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView (R.layout.activity_app_display);
//get extras
Bundle extras = getIntent().getExtras();
if (extras == null) {
return;
}
itemId = extras.getString("id");
itemStatus = extras.getString("IorU");
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressbar);
progressBar.setVisibility(0);
showUI();
}
private void showUI() {
if(m_item != null) {
TextView actvTitle = (TextView) findViewById(R.id.title_text);
actvTitle.setText(m_item.geticategory());
appinstall = (Button) findViewById(R.id.app_install_btn);
appudinstall = (Button) findViewById(R.id.app_udinstall_btn);
permlist = (LinearLayout) findViewById(R.id.app_perm); //
info = (LinearLayout) findViewById(R.id.info);
mList = (HeightListView) findViewById(R.id.app_perm_list);
mList.setTextFilterEnabled(true);
instTxt = (TextView) findViewById(R.id.app_install);
TextView titleTxt = (TextView) findViewById(R.id.app_titlebig);
TextView companyTxt = (TextView) findViewById(R.id.app_descbig);
TextView descTxt = (TextView) findViewById(R.id.long_desc);
TextView verTxt = (TextView) findViewById(R.id.version);
//fill info
titleTxt.setText(m_item.getititle());
companyTxt.setText(m_item.geticompany());
descTxt.setText(m_item.getidescription());
verTxt.setText(" Version:" + m_item.getiversion());
}
}
@Override
protected void onResume(){
super.onResume();
}
@Override
public Object onRetainNonConfigurationInstance() {
Toast.makeText (getApplicationContext(), "onRetainNonConfigurationInstance", Toast.LENGTH_SHORT).show();
return null;
}
@Override
protected void onDestroy() {
super.onDestroy();
/*
if(df != null)
{
if(!df.isCancelled())
df.cancel(true);
}
CN=true;
*/
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStart() {
super.onStart();
}
private class AsyncDownloadTask extends AsyncTask<String, Integer, Void>
{
private int successCount;
private int numTotalFiles;
private File outputFile;
private String pack;
private int downloadErr = 0;
@Override
protected void onPreExecute()
{
super.onPreExecute();
successCount = 0;
notificationManager = (NotificationManager) getApplicationContext().getSystemService(getApplicationContext().NOTIFICATION_SERVICE);
CN=false;
}
@Override
protected Void doInBackground(String... params)
{
String remoteFilepath;
String id = params[0];
pack = params[1];
remoteFilepath = "http://www.myserver/download/1.zip";
String PATH = Environment.getExternalStorageDirectory()+ "/download/";
File file = new File(PATH);
file.mkdirs();
try
{
if(isCancelled())
return null;
URL url = new URL(remoteFilepath);
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setConnectTimeout(getConnectTimeout());
c.setReadTimeout(getReadTimeout());
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
int filesize = c.getContentLength();
if(filesize > 0)
{
outputFile = new File(file, "1.zip");
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = c.getInputStream();
int bytesRead, totalBytesRead = 0;
byte[] bytes = new byte[BYTES_BUFFER_SIZE];
String progress, kbytes;
while(!isCancelled() && (bytesRead = is.read(bytes)) != -1)
{
totalBytesRead += bytesRead;
fos.write(bytes, 0, bytesRead);
if(!isCancelled()) //&& loopCount++ % 20 == 0)
{
RemoteViews progressView = getProgressView(successCount + 1, numTotalFiles, totalBytesRead, filesize);
if(progressView == null)
{
progress = "Download "+pack;
kbytes = String.format("%s/%s", getStringByteSize(totalBytesRead), getStringByteSize(filesize));
if(!isCancelled() && !CN){
showNotification("Downloading File(s)", progress , kbytes);
publishProgress(totalBytesRead,filesize);
} else { return null; }
}
else
{
if(!isCancelled() && !CN){
showNotification(progressView, "Downloading File(s)");
} else { return null; }
}
}
}
fos.close();
is.close();
if(isCancelled())
return null;
successCount ++;
}
else
{
}
}
catch(Exception e)
{
e.printStackTrace();
showNotification("Download Failed", "Download Progress", "Failed: " + (new File(remoteFilepath)).getName());
//updateCancelInstall();
publishProgress(100,100);
notificationManager.cancel(42);
downloadErr = 1;
CN = true;
}
return null;
}
@Override
protected void onCancelled()
{
super.onCancelled();
showNotification("Download Cancelled", "Download Progress", "Cancelled");
CN = true;
publishProgress(100,100);
notificationManager.cancel(42);
}
protected void onProgressUpdate(Integer... prog) {
if(prog[0]<prog[1]){
updateProgress(prog[0],prog[1],false);
} else {
updateProgress(100,100,true);
notificationManager.cancel(42);
}
}
@Override
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
if(!CN){
if(downloadErr==0) {
showNotification("Installing", "Installing "+pack, "Completed");
updateDLcount udl = new updateDLcount();
udl.execute("hello");
//updateCancelInstall();
notificationManager.cancel(42);
} else {
showNotification("Download Error", "Failed to download "+pack, "Error");
//updateCancelInstall();
notificationManager.cancel(42);
}
}
}
}
protected RemoteViews getProgressView(int currentNumFile, int totalNumFiles, int currentReceivedBytes, int totalNumBytes)
{
return null;
}
protected Class<?> getIntentForLatestInfo()
{
return DisplayApp.class;
}
protected void showNotification(String ticker, String title, String content)
{
Notification notification = new Notification(R.drawable.download_icon, ticker, System.currentTimeMillis());
Intent i=new Intent(this, DisplayApp.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
i.putExtra("id", itemId);
i.putExtra("IorU", "itemStatus");
i.putExtra("progrss", content);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, i, 0);
notification.setLatestEventInfo(getApplicationContext(), title, content, contentIntent);
notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;
notificationManager.notify(42, notification);
if(content.equalsIgnoreCase("Cancelled")||content.equalsIgnoreCase("Completed")||CN)notificationManager.cancel(42);
}
protected void updateProgress(int downsize, int totalsize, boolean cancel){
//Log.i("YYYY","cancel="+cancel);
if(!cancel || (downsize<totalsize)){
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressbar);
TextView pb_t = (TextView) findViewById(R.id.progressbar_text);
progressBar.setVisibility(0);
pb_t.setVisibility(0);
progressBar.setProgress((int)downsize*100/totalsize);
pb_t.setText(String.format("%s/%s", getStringByteSize(downsize), getStringByteSize(totalsize)));
} else {
ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressbar);
TextView pb_t = (TextView) findViewById(R.id.progressbar_text);
progressBar.setProgress(100);
progressBar.setVisibility(4);
pb_t.setVisibility(4);
updateCancelInstall();
}
}
protected void showNotification(RemoteViews remoteView, String ticker)
{
Notification notification = new Notification(R.drawable.download_icon, ticker, System.currentTimeMillis());
notification.contentView = remoteView;
Intent i=new Intent(this, DisplayApp.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
notification.contentIntent = PendingIntent.getActivity(this, 0, i, 0);
//Log.d("YYYY","2:"+notification.contentIntent.toString());
notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;
notificationManager.notify(42, notification);
}
感激，如果你可以通過代碼幫助我，網址或者模仿市場這種做法的任何文件。
感謝
這已經設置（我累了singletop，singletask singleinstance），仍然不能防止新的實例創建<活動機器人：名字=機器人 「DisplayApp」：configChanges = 「方向| keyboardHidden」 機器人：theme =「@ style/Theme.D1」android：launchMode =「singleTop」android：label =「@ string/title」> – BBAND
嗯，在這種情況下，看起來你已經做了所有我能想到的事情，問題，道歉我不能有更多的幫助。 – Leyths
看來我需要保存活動的實例，然後按照文檔[這裏]（http://developer.android.com/reference/android/app/Activity.html#onSaveInstanceState%28android.os.Bundle ％29），如果是的話，我需要一些代碼幫助如何保存我的活動視圖並恢復它？ – BBAND