我试图将图片（png）从Parse.com加载到我应用程序的一个片段中，而我得到的只是临时图像而不是我想要的图像。它可以工作，但它不会加载我想要的图像，它会加载临时图像。请帮忙！ 这是我的代码：
更新：已修复。在应用程序中将图像加载到我的gridview。我必须编辑模拟器的SD卡大小和内部存储器才能工作。
package ope.playingwithtabs;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
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.GridView;
import com.parse.Parse;
import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import java.util.ArrayList;
import java.util.List;
public class TwoFragment extends Fragment{
public TwoFragment() {
// Required empty public constructor
}
GridView gridview;
List<ParseObject> ob;
ProgressDialog mProgressDialog;
GridViewAdapter adapter;
private List<GameList> gamearraylist = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Parse.initialize(getContext());
new RemoteDataTask().execute();
}
// RemoteDataTask AsyncTask
private class RemoteDataTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(getContext());
// Set progressdialog title
mProgressDialog.setTitle("Place Holder Title");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create the array
gamearraylist = new ArrayList<GameList>();
try {
// Locate the class table named "GamesList" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(
"GamesList");
// Locate the column named "position" in Parse.com and order list
// by ascending
query.orderByAscending("position");
ob = query.find();
for (ParseObject gameslist : ob) {
ParseFile image = (ParseFile) gameslist.get("games");
GameList map = new GameList();
map.setGame(image.getUrl());
gamearraylist.add(map);
}
} catch (ParseException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// Locate the gridview in gridview_main.xml
gridview = (GridView) getView().findViewById(R.id.gridView);
// Pass the results into ListViewAdapter.java
adapter = new GridViewAdapter(getContext(),
gamearraylist);
// Binds the Adapter to the ListView
gridview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
Gridview布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="info.androidhive.materialtabs.fragments.OneFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RPG"
android:textSize="40sp"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp"
android:id="@+id/textView" />
<GridView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/gridView"
android:layout_centerHorizontal="true"
android:scrollbars="none"
android:stretchMode="columnWidth"
android:numColumns="3"
android:verticalSpacing="4dp"
android:padding="4dp"
android:gravity="center"
android:layout_below="@+id/textView" />
</RelativeLayout>
Gridview适配器
package ope.playingwithtabs;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Ope on 12/12/2015.
*/
public class GridViewAdapter extends BaseAdapter{
// Declare Variables
Context context;
LayoutInflater inflater;
ImageLoader imageLoader;
private List<GameList> gamearraylist = null;
private ArrayList<GameList> arraylist;
public GridViewAdapter(Context context, List<GameList> gamearraylist) {
this.context = context;
this.gamearraylist = gamearraylist;
inflater = LayoutInflater.from(context);
this.arraylist = new ArrayList<GameList>();
this.arraylist.addAll(gamearraylist);
imageLoader = new ImageLoader(context);
}
public class ViewHolder {
ImageView game;
}
@Override
public int getCount() {
return gamearraylist.size();
}
@Override
public Object getItem(int position) {
return gamearraylist.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.gridview_item, null);
// Locate the ImageView in gridview_item.xml
holder.game = (ImageView) view.findViewById(R.id.game);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// Load image into GridView
imageLoader.DisplayImage(gamearraylist.get(position).getGame(),
holder.game);
// Capture GridView item click
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// Send single item click data to SingleItemView Class
Intent intent = new Intent(context, SingleItemView.class);
// Pass all data phone
intent.putExtra("game", gamearraylist.get(position)
.getGame());
context.startActivity(intent);
}
});
return view;
}
ImageLoader的
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.temp_img;
public void DisplayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 100;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
和logcat错误：
12-12 17:19:13.574 3629-3655/? I/MemoryCache: cache size=0 length=1
12-12 17:19:13.575 3629-3656/? W/System.err: java.io.FileNotFoundException: /storage/1AE7-3419/GamesParse/344698653: open failed: ENOENT (No such file or directory)
12-12 17:19:13.576 3629-3656/? W/System.err: at libcore.io.IoBridge.open(IoBridge.java:452)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.io.FileOutputStream.<init>(FileOutputStream.java:72)
12-12 17:19:13.576 3629-3656/? W/System.err: at ope.playingwithtabs.ImageLoader.getBitmap(ImageLoader.java:79)
12-12 17:19:13.576 3629-3656/? W/System.err: at ope.playingwithtabs.ImageLoader.access$000(ImageLoader.java:27)
12-12 17:19:13.576 3629-3656/? W/System.err: at ope.playingwithtabs.ImageLoader$PhotosLoader.run(ImageLoader.java:153)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
12-12 17:19:13.576 3629-3656/? W/System.err: at java.lang.Thread.run(Thread.java:818)
12-12 17:19:13.576 3629-3656/? W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
12-12 17:19:13.576 3629-3656/? W/System.err: at libcore.io.Posix.open(Native Method)
12-12 17:19:13.576 3629-3656/? W/System.err: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
12-12 17:19:13.576 3629-3656/? W/System.err: at libcore.io.IoBridge.open(IoBridge.java:438)
12-12 17:19:13.576 3629-3656/? W/System.err: ... 10 more