Как скрыть изображения, поступающие с http url?

Question

Я пытаюсь сделать приложение, в котором изображения поступают с сервера, я хочу сделать слайдер изображения из этих изображений. Для достижения этой цели я перешедших из here и here, но я получаю ошибку

Мои ImageAdapter.java

public class ImageAdapter extends PagerAdapter { 
    Context context; 

    String[] imagUrl={"http://www.vector-eps.com/wp-content/gallery/donald-duck-vectors/thumbs/thumbs_donald-duck-vectors11.jpg", 
      "http://www.vector-eps.com/wp-content/gallery/donald-duck-vectors/thumbs/thumbs_donald-duck-vectors11.jpg", 
      "http://www.vector-eps.com/wp-content/gallery/donald-duck-vectors/thumbs/thumbs_donald-duck-vectors11.jpg"}; 


    ImageAdapter(Context context){ 
     this.context=context; 
    } 
    @Override 
    public int getCount() { 
     return imagUrl.length; 
    } 

    @Override 
    public boolean isViewFromObject(View view, Object object) { 
     return view == ((ImageView) object); 
    } 

    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     ImageView imageView = new ImageView(context); 

     ImageLoader imgLoader = new ImageLoader(context); 
     int loader = R.drawable.ic_cancel; 

     imgLoader.DisplayImage(imagUrl[position], loader, imageView); 
     return imageView; 
    } 

    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
     ((ViewPager) container).removeView((ImageView) object); 
    } 
} 

Вот ImageLoader.java

public class ImageLoader { 

    MemoryCache memoryCache=new MemoryCache(); 
    FileCache fileCache; 
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>()); 
    ExecutorService executorService; 

    public ImageLoader(Context context){ 
     fileCache=new FileCache(context); 
     executorService=Executors.newFixedThreadPool(5); 
    } 

    int stub_id = R.drawable.ic_cancel; 
    public void DisplayImage(String url, int loader, ImageView imageView) 
    { 
     stub_id = loader; 
     imageViews.put(imageView, url); 
     Bitmap bitmap=memoryCache.get(url); 
     if(bitmap!=null) 
      imageView.setImageBitmap(bitmap); 
     else 
     { 
      queuePhoto(url, imageView); 
      imageView.setImageResource(loader); 
     } 
    } 

    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); 

     //from SD cache 
     Bitmap b = decodeFile(f); 
     if(b!=null) 
      return b; 

     //from web 
     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(); 
      bitmap = decodeFile(f); 
      return bitmap; 
     } catch (Exception ex){ 
      ex.printStackTrace(); 
      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; 
      BitmapFactory.decodeStream(new FileInputStream(f),null,o); 

      //Find the correct scale value. It should be the power of 2. 
      final int REQUIRED_SIZE=70; 
      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; 
      return BitmapFactory.decodeStream(new FileInputStream(f), null, o2); 
     } catch (FileNotFoundException e) {} 
     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() { 
      if(imageViewReused(photoToLoad)) 
       return; 
      Bitmap bmp=getBitmap(photoToLoad.url); 
      memoryCache.put(photoToLoad.url, bmp); 
      if(imageViewReused(photoToLoad)) 
       return; 
      BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad); 
      Activity a=(Activity)photoToLoad.imageView.getContext(); 
      a.runOnUiThread(bd); 
     } 
    } 

    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(); 
    } 

} 

И MainActivity.java

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager); 
     ImageAdapter adapter = new ImageAdapter(this); 
     viewPager.setAdapter(adapter); 

    } 
} 

LogCat является

09-05 14:59:49.765 8364-8364/com.example.pitech09.slidee I/art: Late-enabling -Xcheck:jni 
09-05 14:59:49.795 8364-8372/com.example.pitech09.slidee E/art: Failed sending reply to debugger: Broken pipe 
09-05 14:59:49.795 8364-8372/com.example.pitech09.slidee I/art: Debugger is no longer active 
09-05 14:59:50.820 8364-8364/com.example.pitech09.slidee W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
09-05 14:59:51.071 8364-8416/com.example.pitech09.slidee D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 
09-05 14:59:51.081 8364-8364/com.example.pitech09.slidee D/Atlas: Validating map... 
09-05 14:59:51.129 8364-8416/com.example.pitech09.slidee I/Adreno-EGL: <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.016_msm8610_LA.BF.1.1.1_RB1__release_AU() 
                     OpenGL ES Shader Compiler Version: E031.25.03.00 
                     Build Date: 02/11/15 Wed 
                     Local Branch: 
                     Remote Branch: quic/LA.BF.1.1.1_rb1.10 
                     Local Patches: NONE 
                     Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.016 + 62ca4eb + acd831d + 9f8b442 + e027a02 + cba30ba + 53c303a + a649d79 + 23e16f8 + 5e97da7 + cbd2a44 + 33d072a + 7aacf06 + 72b33e7 + 28f6f60 + b4c13d8 + NOTHING 
09-05 14:59:51.130 8364-8416/com.example.pitech09.slidee I/OpenGLRenderer: Initialized EGL, version 1.4 
09-05 14:59:51.148 8364-8416/com.example.pitech09.slidee D/OpenGLRenderer: Enabling debug mode 0 
09-05 14:59:51.254 8364-8364/com.example.pitech09.slidee W/IInputConnectionWrapper: showStatusIcon on inactive InputConnection 
09-05 14:59:58.706 8364-8954/com.example.pitech09.slidee W/System.err: java.io.FileNotFoundException: /storage/emulated/0/TempImages/-1563297368: open failed: EACCES (Permission denied) 
09-05 14:59:58.706 8364-8954/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:456) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:87) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:72) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.getBitmap(ImageLoader.java:77) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.access$000(ImageLoader.java:26) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader$PhotosLoader.run(ImageLoader.java:137) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at java.lang.Thread.run(Thread.java:818) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at libcore.io.Posix.open(Native Method) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:442) 
09-05 14:59:58.707 8364-8954/com.example.pitech09.slidee W/System.err: ... 10 more 
09-05 14:59:58.816 8364-8953/com.example.pitech09.slidee W/System.err: java.io.FileNotFoundException: /storage/emulated/0/TempImages/-1563297368: open failed: EACCES (Permission denied) 
09-05 14:59:58.816 8364-8953/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:456) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:87) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:72) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.getBitmap(ImageLoader.java:77) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.access$000(ImageLoader.java:26) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader$PhotosLoader.run(ImageLoader.java:137) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at java.lang.Thread.run(Thread.java:818) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at libcore.io.Posix.open(Native Method) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:442) 
09-05 14:59:58.817 8364-8953/com.example.pitech09.slidee W/System.err: ... 10 more 
09-05 15:01:41.300 8364-8372/com.example.pitech09.slidee I/art: Debugger is no longer active 
09-05 15:07:17.204 8364-8372/com.example.pitech09.slidee I/art: Debugger is no longer active 
09-05 15:11:03.084 29993-29993/com.example.pitech09.slidee W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
09-05 15:11:03.332 29993-30065/com.example.pitech09.slidee D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 
09-05 15:11:03.345 29993-29993/com.example.pitech09.slidee D/Atlas: Validating map... 
09-05 15:11:03.458 29993-30065/com.example.pitech09.slidee I/Adreno-EGL: <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.016_msm8610_LA.BF.1.1.1_RB1__release_AU() 
                     OpenGL ES Shader Compiler Version: E031.25.03.00 
                     Build Date: 02/11/15 Wed 
                     Local Branch: 
                     Remote Branch: quic/LA.BF.1.1.1_rb1.10 
                     Local Patches: NONE 
                     Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.016 + 62ca4eb + acd831d + 9f8b442 + e027a02 + cba30ba + 53c303a + a649d79 + 23e16f8 + 5e97da7 + cbd2a44 + 33d072a + 7aacf06 + 72b33e7 + 28f6f60 + b4c13d8 + NOTHING 
09-05 15:11:03.464 29993-30065/com.example.pitech09.slidee I/OpenGLRenderer: Initialized EGL, version 1.4 
09-05 15:11:03.508 29993-30065/com.example.pitech09.slidee D/OpenGLRenderer: Enabling debug mode 0 
09-05 15:11:03.513 29993-30006/com.example.pitech09.slidee I/art: Background sticky concurrent mark sweep GC freed 18529(2MB) AllocSpace objects, 9(170KB) LOS objects, 30% free, 5MB/8MB, paused 5.840ms total 113.009ms 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err: java.io.FileNotFoundException: /storage/emulated/0/TempImages/-1563297368: open failed: EACCES (Permission denied) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:456) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:87) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:72) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.getBitmap(ImageLoader.java:77) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.access$000(ImageLoader.java:26) 
09-05 15:11:03.972 29993-30066/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader$PhotosLoader.run(ImageLoader.java:137) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at java.lang.Thread.run(Thread.java:818) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied) 
09-05 15:11:03.973 29993-30066/com.example.pitech09.slidee W/System.err:  at libcore.io.Posix.open(Native Method) 
09-05 15:11:03.975 29993-30066/com.example.pitech09.slidee W/System.err:  at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186) 
09-05 15:11:03.975 29993-30066/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:442) 
09-05 15:11:03.975 29993-30066/com.example.pitech09.slidee W/System.err: ... 10 more 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err: java.io.FileNotFoundException: /storage/emulated/0/TempImages/-1563297368: open failed: EACCES (Permission denied) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:456) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:87) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.io.FileOutputStream.<init>(FileOutputStream.java:72) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.getBitmap(ImageLoader.java:77) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader.access$000(ImageLoader.java:26) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at com.example.pitech09.slidee.ImageLoader$PhotosLoader.run(ImageLoader.java:137) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at java.lang.Thread.run(Thread.java:818) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied) 
09-05 15:11:04.088 29993-30067/com.example.pitech09.slidee W/System.err:  at libcore.io.Posix.open(Native Method) 
09-05 15:11:04.089 29993-30067/com.example.pitech09.slidee W/System.err:  at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186) 
09-05 15:11:04.089 29993-30067/com.example.pitech09.slidee W/System.err:  at libcore.io.IoBridge.open(IoBridge.java:442) 
09-05 15:11:04.089 29993-30067/com.example.pitech09.slidee W/System.err: ... 10 more 
09-05 15:11:15.361 29993-30001/com.example.pitech09.slidee W/art: Suspending all threads took: 15.336ms 

Я добавил следующие разрешения

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> 

Answer 1

Вы используете универсальный погрузчик изображения, так что вы должны следовать этой инструкции по быстрой настройке, пожалуйста, прочитайте UIL Quick Setup. Пожалуйста, ознакомьтесь с установкой Android Manifest, в которой говорится, что в вашем манифесте приложения должны быть разрешения на использование Интернета и внешнего хранилища. так что вы должны добавить как разрешение на вас AndroidManifest.xml файл

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

И если вы работаете на апи Лаваля 23 вы должны спросить разрешения во время выполнения первых перед использованием универсального погрузчика изображения. Пожалуйста, прочитайте официальную документацию для более подробной информации. Runtime Permission Documentation