我想在Fragment中显示进度下载进度的对话框但我无法显示对话框。我可以下载图片但是会显示ProgressDialog的whitout。我的代码是：
import android.app.Dialog;
import android.app.ProgressDialog;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import com.rengwuxian.materialedittext.MaterialEditText;
import com.rey.material.widget.SnackBar;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import static java.lang.Integer.*;
public class PicFragment extends Fragment {
private static Button btndownload;
private static MaterialEditText address;
private static MaterialEditText name;
private static SnackBar CheckNetSnack;
private RelativeLayout relativeLayout;
private static ImageView dlimg;
private ProgressDialog pDialog;
public static final int progress_bar_type = 0;
// File url to download
private static String file_url = "http://api.androidhive.info/progressdialog/hive.jpg";
public PicFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_pic, container, false);
relativeLayout = (RelativeLayout) view.findViewById(R.id
.relativeLayout);
dlimg = (ImageView) view.findViewById(R.id.dlimg);
btndownload = (Button) view.findViewById(R.id.download);
btndownload.setTypeface(Typeface.createFromAsset(getActivity().getAssets(), "fonts/iraniansans.ttf"));
btndownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getContext(), "Net is Ok", Toast.LENGTH_SHORT).show();
new DownloadFileFromURL().execute("http://dl.esfandune.ir/android/esfandune.jpg");
//new NetCheck().execute();
}
});
address = (MaterialEditText) view.findViewById(R.id.addresEdittext);
address.setTypeface(Typeface.createFromAsset(getActivity().getAssets(), "fonts/iraniansans.ttf"));
return view;
}
/**
* Showing Dialog
* */
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar_type:
pDialog = new ProgressDialog(getActivity().getBaseContext());
pDialog.setMessage("Downloading file. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(true);
pDialog.show();
return pDialog;
default:
return null;
}
}
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
getActivity().showDialog(progress_bar_type);
}
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress(""+(int)((total*100)/lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
* */
protected void onProgressUpdate(String... progress) {
// setting progress percentage
pDialog.setProgress(Integer.parseInt(progress[0]));
}
/**
* After completing background task
* Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
getActivity().dismissDialog(progress_bar_type);
// Displaying downloaded image into image view
// Reading image path from sdcard
String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg";
// setting downloaded into image view
dlimg.setImageDrawable(Drawable.createFromPath(imagePath));
}
}
}
当我使用这个whitout片段时，它可以正常工作，但是通过片段，我无法运行它
答案 0 :(得分：2)
创建进度对话框片段：
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
public class ProgressDialogFragment extends DialogFragment
{
public ProgressDialogFragment(Context context, String progressText, ProgressDialogCancellationSignal handler)
{
mContext = context;
mProgressText = progressText;
mProgressDialogCancelHandler = handler;
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
ProgressDialog progressDialog = new ProgressDialog(mContext, ProgressDialog.THEME_HOLO_LIGHT);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setCancelable(mProgressDialogCancelHandler == null ? false : false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.setIndeterminate(true);
if (mProgressText != null)
{
progressDialog.setMessage(mProgressText);
}
return progressDialog;
}
@Override
public void onCancel(DialogInterface dialog)
{
if (mProgressDialogCancelHandler != null)
{
mProgressDialogCancelHandler.onCancel();
}
super.onCancel(dialog);
}
/**
* Used to set progress in progress dialog at runtime
* @param totalProgress : total progress done till now on the given task
* @param totalValue : total value of the given task
* @param units : measurement unit of progress of given task
*/
public void setProgress(String totalProgress, String totalValue, String units)
{
Dialog dialog = getDialog();
if (dialog instanceof ProgressDialog && mProgressText != null)
{
((ProgressDialog) dialog).setMessage(mProgressText + " " + totalProgress + units + " / " + totalValue + units);
}
}
private String mProgressText;
private Context mContext;
private ProgressDialogCancellationSignal mProgressDialogCancelHandler;
public interface ProgressDialogCancellationSignal
{
void onCancel();
}
}
在DownloadFileFromURL课程中，有两种方法：
@Override
public void showProgress()
{
if (mProgressFragment == null)
{
mProgressFragment = new ProgressDialogFragment(<your Activity>.this,
"text string", null);
}
mProgressFragment.setCancelable(false);
mProgressFragment.show(<YourActivity>.this.getFragmentManager(), PROGRESS_DIALOG_TAG);
}
@Override
public void dismissProgress()
{
if (mProgressFragment != null)
{
if (mProgressFragment.isAdded())
{
mProgressFragment.dismissAllowingStateLoss();
}
mProgressFragment = null;
}
}
private DialogFragment mProgressFragment;
private static final String PROGRESS_DIALOG_TAG = "ProcessProgressDialog";
onPreExecute调用AsyncTask对话方法的showProgress方法和onPostExecute调用AsyncTask对话方法的dismissProgress方法onProgressUpdate方法调用setProgressMethod()。
编辑1 您的AsyncTask将如下所示：
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
private DialogFragment mProgressFragment;
private static final String PROGRESS_DIALOG_TAG = "ProcessProgressDialog";
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
public void showProgress()
{
if (mProgressFragment == null)
{
mProgressFragment = new ProgressDialogFragment(PicFragment.this.getActivity(),
"downloading...", null);
}
mProgressFragment.setCancelable(false);
mProgressFragment.show(PicFragment.this.getActivity().getFragmentManager(), PROGRESS_DIALOG_TAG);
}
@Override
public void dismissProgress()
{
if (mProgressFragment != null)
{
if (mProgressFragment.isAdded())
{
mProgressFragment.dismissAllowingStateLoss();
}
mProgressFragment = null;
}
}
@Override
protected void onPreExecute() {
super.onPreExecute();
showProgress();
}
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress(""+(int)((total*100)/lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
* */
protected void onProgressUpdate(String... progress) {
// setting progress percentage
mProgressFragment.setProgress(<total progress >, progress[0], "<units> example KB or MB");
}
/**
* After completing background task
* Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
dismissProgress();
// Displaying downloaded image into image view
// Reading image path from sdcard
String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg";
// setting downloaded into image view
dlimg.setImageDrawable(Drawable.createFromPath(imagePath));
}
}