Java 你能告诉我为什么这些方法超出范围吗?
我正在使用教程创建一个下载类,它使用一个进度对话框。show和dissmiss方法位于asynchTask类内的受保护类中。IDE告诉我它无法解决这些问题Java 你能告诉我为什么这些方法超出范围吗?,java,android,class,scope,Java,Android,Class,Scope,我正在使用教程创建一个下载类,它使用一个进度对话框。show和dissmiss方法位于asynchTask类内的受保护类中。IDE告诉我它无法解决这些问题 public class DownloadHandler { private Context mContext; public String filename; private String remotePath; public static final int DIALOG_DOWNLOAD_PROGRE
public class DownloadHandler {
private Context mContext;
public String filename;
private String remotePath;
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
public DownloadHandler(String rp, String f, Context c) throws Exception {
mContext = c;
remotePath = rp;
filename = f;
}
private void startDownload() {
String url = "http://example.com/"+remotePath+"/"+filename+".pdf";
new DownloadFileAsync().execute(url);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(mContext);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
//===================showDialog can not be resolved============================
showDialog(DIALOG_DOWNLOAD_PROGRESS);
//========================================================================
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lengthOfFile = conexion.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
//write it to the internal storage
OutputStream output = new FileOutputStream(filename+".pdf");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lengthOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
//=========dismissDialog can not be resolved ==================
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
//=============================================================
}
}
}
它与受保护的类有关吗?showDialog和dismissDialog在活动类中。在本教程中,它显示了类下载扩展了活动,然后内部类可以使用该活动
有下载扩展活动。至于不推荐使用的方法,这是因为您应该使用DialogFragment。显然,你正在学习的教程已经过时了,你应该研究一下我在井中没有看到这些方法,我不知道。本教程就是这样写的。现在,我在没有任何mods的情况下直接复制和粘贴了这些方法,我的IDE显示这些方法已不推荐使用。请将我链接到tutorialIf I extend活动,该活动已解决,但显示已不推荐使用。等一下,我去拿链接。@VinceEmigh