我有一个viewpager，用于加载用户从图库中选择的图像。 在该viewpager的最后一页，我有一个上传按钮。 该按钮应该将viewpager中的图像加载到网站。但是，我的问题在这里，我想在viewpager中的每个图像下显示一个进度条。 在我的xml文件中，我将进度条视为不可见，并且每当用户按下上传栏时，进度条将设置为可见。 这适用于我当前的位置（这是最后一个）。但是，如果我向后滑动，我看不到进度条。 我需要在viewpager中的每个图像下显示进度条，而不仅仅是最后一页。 任何帮助表示赞赏。
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.app.NotificationManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.ActivityInfo;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.NotificationCompat;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
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.ProgressBar;
import android.widget.RelativeLayout;
import java.util.ArrayList;
public class ViewPagerAdapter extends PagerAdapter {
// Declare Variables
int click=0;
int execute=0;
private NotificationManager mNotifyManager;
private NotificationCompat.Builder mBuilder;
View itemView;
int id=1;
Context context;
int number_pages;
ArrayList<Uri> uris;
LayoutInflater inflater;
/**
* get the information from the other activity
* @param context
* @param imageUris paths of the images
* @param number_images : number of pages displayed according to the number of images selected
*/
public ViewPagerAdapter(Context context, ArrayList<Uri> imageUris, int number_images) {
this.context = context;
this.uris = imageUris;
this.number_pages = number_images;
}
/**
* get the number of pages to be used by the initiate number
* @return number of pages
*/
@Override
public int getCount() {
return number_pages;
}
/**
* get the layout
* @param view
* @param object
* @return
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
/**
* initiate the items of the pages
* @param container
* @param position : position of the current page
* @return the view
*/
@Override
public Object instantiateItem(ViewGroup container, final int position) {
ImageView img;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
itemView = inflater.inflate(R.layout.viewpager_item, container, false);
final ProgressBar spinner= (ProgressBar)itemView.findViewById(R.id.loading);
Button btn = (Button) itemView.findViewById(R.id.button);
// Locate the ImageView in viewpager_item.xml
img = (ImageView) itemView.findViewById(R.id.View1);
// Capture position and set to the ImageView
img.setImageURI(uris.get(position));
if (number_pages - position == 1) {
btn.setVisibility(View.VISIBLE);
}
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
click=1;
CustomViewPagerListener spinners = new CustomViewPagerListener();
spinners.onPageScrolled(position,10,10);
spinners.onPageSlected(position);
final ConnectivityManager connMgr = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
final android.net.NetworkInfo wifi = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
final android.net.NetworkInfo mobile = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (wifi.isAvailable() && wifi.getDetailedState() == NetworkInfo.DetailedState.CONNECTED || mobile.isAvailable() && mobile.getDetailedState() == NetworkInfo.DetailedState.CONNECTED) {
for (int i = 0; i < number_pages; i++) {
mNotifyManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mBuilder = new NotificationCompat.Builder(context);
mBuilder.setContentTitle("Upload").setContentText("Upload in Porgress").setSmallIcon(R.drawable.ic_launcher);
new Uploader().execute();
}
}
else{
//show alert box
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Error Uploading");
alertDialog.setMessage("Please make sure you are connected to the internet");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//ok
}
});
alertDialog.show();
}
}
class Uploader extends AsyncTask<Void, Integer, Integer> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Displays the progress bar for the first time.
mBuilder.setProgress(100, 0, false);
mNotifyManager.notify(id, mBuilder.build());
}
@Override
protected void onProgressUpdate(Integer... values) {
// Update progress
mBuilder.setProgress(100, values[0], false);
mNotifyManager.notify(id, mBuilder.build());
super.onProgressUpdate(values);
}
@Override
protected Integer doInBackground(Void... params) {
int i;
execute++;
for (i = 0; i <= 100; i += 20) {
// Sets the progress indicator completion percentage
publishProgress(Math.min(i, 100));
try {
// Sleep for 5 seconds
Thread.sleep(2 * 1000);
} catch (InterruptedException e) {
Log.d("TAG", "sleep failure");
}
}
return null;
}
@Override
protected void onPostExecute(Integer result) {
super.onPostExecute(result);
if(execute==number_pages-1){
mBuilder.setContentText("Upload Complete");
}
// Removes the progress bar
mBuilder.setProgress(0, 0, false);
mNotifyManager.notify(id, mBuilder.build());
}
}
});
// Add viewpager_item.xml to ViewPager
((ViewPager) container).addView(itemView);
return itemView;
}
/**
* Destroy the item of the views when done
* @param container
* @param position
* @param object
*/
@Override
public void destroyItem (ViewGroup container,int position, Object object){
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
private class CustomViewPagerListener extends ViewPager.SimpleOnPageChangeListener {
final ProgressBar spinner= (ProgressBar)itemView.findViewById(R.id.loading);
@Override
public void onPageSelected(int p){
if(click==1){
spinner.setVisibility(View.VISIBLE);
}
}
@Override
public void onPageScrolled(int p, float positionOffset, int positionOffsetPixels) {
if(click==1)
spinner.setVisibility(View.VISIBLE);
}
}
}
答案 0 :(得分：2)
XML示例：
<RealtiveLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
</ViewPager>
<ProgressBar
....
android:layout_alignParentBottom="true" />
这会导致Progress进入所有项目，导致进度条根本不包含在ViewPager中。