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我想製作一個應用程序，其中圖像來自服務器，我想從該圖像製作圖像滑塊。要做到這一點，我從here和here提到，但我得到的錯誤如何滑動來自http url的圖片？
我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);
}
}
這裏的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();
}
}
而且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);
}
}
該logcat的是
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
我加你正在使用通用圖像裝載機所以你必須遵循這個快速設置指令以下權限
<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"/>
您是否已將'<使用權限android：name =「android.permission.READ_EXTERNAL_STORAGE」/>'添加到您的Manifest.xml中？ –
是的，這是我已經包括的權限 - <使用權限android：name =「android.permission.INTERNET」/> <使用權限android：name =「android.permission.ACCESS_NETWORK_STATE」/> <使用-permission android：name =「android.permission.READ_EXTERNAL_STORAGE」/> <使用權限android：name =「android.permission.ACCESS_WIFI_STATE」/> – Kritiii
您是否正在測試'6.0 Marshmallow'？ –