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我有一個顯示數據庫記錄列表的活動。 在這個活動中有一個自定義的ListView。 在自定義ListView中，有一個Button和一個TextView以及一個ProgressBar。 我調用AsyncTask的按鈕偵聽器位於CustomAdapter類中。在下載時更新ListView中的進度欄
DownloadTask downloadTask = new DownloadTask(getContext());
downloadTask.execute(url[position].toString());
AsynkTask很好。 但我想在下載過程中更新進度欄。 我在互聯網上搜索了三天，但沒有成功。 我很抱歉，我的英語
public class listanimals extends ActionBarActivity {
private MyDatabase MyDataBase;
String[] listurl;
ProgressBar progressBar;
TextView url2;
CustomList adapter;
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
public class DownloadTask extends AsyncTask<String, Integer, String> {
private Context context;
int myProgress;
public DownloadTask(Context context) {
this.context = context;
}
@Override
protected String doInBackground(String... sUrl) {
InputStream input = null;
final GlobalClass caches = (GlobalClass) context.getApplicationContext();
OutputStream output = null;
HttpURLConnection connection = null;
try {
URL url = new URL(sUrl[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
return "Server returned HTTP " + connection.getResponseCode()
+ " " + connection.getResponseMessage();
}
input = connection.getInputStream();
output = new FileOutputStream("/sdcard/"+caches.getName_cach()+".mp3");
byte data[] = new byte[4096];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
myProgress = (int)(total*100/connection.getContentLength());
output.write(data, 0, count);
}
} catch (Exception e) {
return e.toString();
} finally {
try {
if (output != null)
output.close();
if (input != null)
input.close();
} catch (IOException ignored) {
}
if (connection != null)
connection.disconnect();
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
//MY PROBLEM MAY HERE
progressBar.setProgress(myProgress);
}
@Override
protected void onPostExecute(String result) {
final GlobalClass caches = (GlobalClass) context.getApplicationContext();
if (result != null)
Toast.makeText(context,"Download error: "+result, Toast.LENGTH_LONG).show();
else{
Toast.makeText(context,"File downloaded"+ "" + caches.getName_cach(), Toast.LENGTH_SHORT).show();
}
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////AsynkTask end
///////////////////////////////////////////////////////////////////////////////////////
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listanimals);
MyDataBase = new MyDatabase(this);
final GlobalClass caches = (GlobalClass) getApplicationContext();
final ListView listView=(ListView)findViewById(R.id.listView);
SQLiteDatabase mydb = MyDataBase.getReadableDatabase();
Cursor cursor = mydb.rawQuery("select * from animals", null);
ArrayList<String> myList = new ArrayList<String>();
final ArrayList<String> myListname = new ArrayList<String>();
ArrayList<String> myListurl = new ArrayList<String>();
try {
while(cursor.moveToNext()) {
myList.add(cursor.getString(cursor.getColumnIndex("_id")));
myListname.add(cursor.getString(cursor.getColumnIndex("name")).trim());
myListurl.add(cursor.getString(cursor.getColumnIndex("url")));
String[] listname = new String[myListname.size()];
listname = myListname.toArray(listname);
listurl = new String[myListurl.size()];
listurl = myListurl.toArray(listurl);
String[] listid = new String[myList.size()];
listid = myList.toArray(listid);
adapter = new
CustomList(listanimals.this, listname,listurl);
listView.setAdapter(adapter);
}} finally{
mydb.close();
}}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
public class CustomList extends ArrayAdapter<String> {
private MyDatabase MyDataBase;
private final Activity context;
private final String[] web;
private final String[] url;
public CustomList(Activity context,
String[] web,String[] url) {
super(context, R.layout.list_file, web);
this.context = context;
this.web = web;
this.url = url;
}
@Override
public View getView(final int position, View view, final ViewGroup parent) {
final GlobalClass caches = (GlobalClass) context.getApplicationContext();
MyDataBase = new MyDatabase(getContext());
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.list_file, null, true);
Typeface kamran= Typeface.createFromAsset(context.getAssets(), "IranNastaliq.ttf");
progressBar=(ProgressBar)rowView.findViewById(R.id.progressBar);
TextView txtTitle3 = (TextView) rowView.findViewById(R.id.textView);
txtTitle3.setTypeface(kamran);
url2=(TextView)rowView.findViewById(R.id.textView2);
url2.setText(url[position]);
txtTitle3.setText(web[position]);
Button download=(Button)rowView.findViewById(R.id.button);
download.setTag(position);// Any data associated with the button has to be added with setTag()
download.setOnClickListener(new View.OnClickListener() {/////////call AsynkTask
@Override
public void onClick(View arg0) {
caches.setName_cach(web[position]);
DownloadTask downloadTask = new DownloadTask(getContext());
downloadTask.execute(url[position].toString());
}
});
return rowView;
}
}
}
如果它解決了您的問題，請標記爲正確的答案。 – airowe
謝謝Bro.I嘗試過。但是，此方法在進度欄處於活動狀態時起作用。當進度欄處於自定義列表佈局時，這不起作用。解決辦法是什麼？ –
@AmirGheybi您的ProgressBar是類listAnimals的一個實例變量。它應該在該類的onCreate方法中實例化。 – airowe