java - UIL LinearBackground 图像不起作用

Question

我花了半天时间阅读文档和示例。我找不到解决办法。我在 Activity 中有一个 ListView，每个项目都有 LinearLayout 和由 nostr13 使用 Android-Universal-Image-Loader 加载的背景图像。

我使用这个库将 LinearBackground 图像作为背景。在我的 Activity 中，我下载了一个 JSON，解析并使用 URI 创建一个字符串数组。

问题是图书馆的打印是错误的!它与 ImageView 配合使用效果很好，但如果我将 LinearBackground 与 loadImage() 一起使用而不是 displayImage() ，则它不会正确放置背景。慢动作看到的过程如下:创建正确数量的元素 (4)，将第一个加载的图像放置为一行的背景，然后一旦加载另一个图像，库就会用这个不同的新图像替换旧背景，然后它放置另一个图像并停止。这是该错误的一个示例。总是不一样!!!其中一些是空的，但 onLoadingComplete 事件被调用。我认为这是缓存的问题，并且我尝试过 UIL 的选项，但没有成功。图片只有 4 个，而且非常小(每个 <10kb)。

我在onPostExecute事件中设置了适配器，可以吗？

可能是什么问题？

这里是重要的代码:

Activity 代码(我删除了不相关的代码以帮助查找问题):

    public class myActivity extends Activity {
    Context context;

    // Output Vars
    String mStrings[];
    ListView listView;

    // UIL
    DisplayImageOptions options;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      this.overridePendingTransition(R.anim.anim_slide_in_left, R.anim.anim_slide_out_left);
      this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_stagioni);

        listView = (ListView) findViewById(R.id.listView);

        options = new DisplayImageOptions.Builder()
        .showImageOnLoading(R.drawable.ic_launcher)
        .showImageForEmptyUri(R.drawable.fail)
        .showImageOnFail(R.drawable.fail)
        .cacheInMemory(true)
        .cacheOnDisc(true)
        .considerExifParams(true)
        .build();


        startAsynkTask(context);
    }
    public void startAsynkTask(final Context context) {

          AsyncTask<String, Void, Void> task = new AsyncTask<String, Void, Void>() {
          private ProgressDialog pd;
          @Override
          protected void onPreExecute() {
                   pd = new ProgressDialog(ActivityStagioni.this);
                   pd.setTitle(getResources().getString(R.string.dialog_loading));
                   pd.setMessage(getResources().getString(R.string.dialog_loading_stagioni));
                   pd.setCancelable(true);
                   pd.setCanceledOnTouchOutside(true);
                   pd.setIndeterminate(true);
                   pd.show();
          }
          @Override
          protected Void doInBackground(String... arg0) {
              //... Not relevant code ...
          }
          @Override
          protected void onPostExecute(Void result) {
                  pd.dismiss();

                   ((ListView) listView).setAdapter(new ImageAdapter());
                    listView.setOnItemClickListener(new OnItemClickListener() 
                    {               
                        //... Not relevant code ...
                    });
          }
  };
    task.execute();   
      }



public class ImageAdapter extends BaseAdapter {
            ImageLoader imageLoader;

            public ImageAdapter() {

                imageLoader = ImageLoader.getInstance();
            }

            @Override
            public int getCount() {
                return mStrings.length;
            }

            @Override
            public Object getItem(int position) {
                return null;
            }

            @Override
            public long getItemId(int position) {
                return position;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                //ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();


                final ViewHolder holder;
                View view = convertView;
                if (view == null) {
                    view = getLayoutInflater().inflate(R.layout.stagioni_item, parent, false);
                    holder = new ViewHolder();
                    assert view != null;
                    holder.imageView = (LinearLayout) view.findViewById(R.id.linearLayoutLocandina);
                    holder.progressBar = (ProgressBar) view.findViewById(R.id.progress);
                    view.setTag(holder);
                } else {
                    holder = (ViewHolder) view.getTag();
                }

                imageLoader.loadImage(mStrings[position], new SimpleImageLoadingListener() {
                    //final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());

                    @Override
                    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                        // Do whatever you want with Bitmap
                        //if (loadedImage != null) {
                        //  boolean firstDisplay = !displayedImages.contains(imageUri);
                        //  if (firstDisplay) {
                                BitmapDrawable background = new BitmapDrawable(loadedImage);
                                holder.imageView.setBackgroundDrawable(background);
                            //}
                    //  }

                    }
                });

                return view;
            }

ListView 项目是:

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:background="@color/black"
    android:orientation="horizontal" 
    android:weightSum="5"
    android:baselineAligned="false">

    <LinearLayout
        android:id="@+id/linearLayoutLocandina"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical|center_horizontal"
        android:layout_margin="0dp"
        android:layout_weight="1"
        android:background="@drawable/ic_launcher"
        android:gravity="center_vertical|center_horizontal"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_margin="25dp"
            android:layout_weight="5" >

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_margin="25dp"
            android:layout_weight="5"
            android:orientation="vertical" >

        </LinearLayout>

       <LinearLayout
           android:layout_width="fill_parent"
           android:layout_height="fill_parent"
           android:layout_weight="0"
           android:alpha="1"
           android:background="#80000000" >

           <LinearLayout
               android:layout_width="match_parent"
               android:layout_height="fill_parent"
               android:layout_weight="1"
               android:gravity="center_horizontal|center_vertical"
               android:orientation="vertical" >

            <TextView
                android:id="@+id/textView_NumeroStagione"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="bottom|center_horizontal"
                android:text="30"
                android:textColor="@color/white"
                android:textSize="25sp"
                android:textStyle="bold" />

            </LinearLayout>



           <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView_NomeStagione"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="2dp"
                android:layout_weight="0"
                android:text="TextView"
                android:textColor="@color/white" />

            <TextView
                android:id="@+id/textView_NumeroEpisodi"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:layout_weight="1"
                android:gravity="center_horizontal"
                android:text="TextView"
                android:textColor="@color/white" />

            </LinearLayout>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_vertical|center_horizontal"
                android:orientation="vertical" >

              <TextView
                android:id="@+id/textView_objectID"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:visibility="invisible" />

            </LinearLayout>
        </LinearLayout>

       <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical" >
            <ProgressBar
        android:id="@+id/progress"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:indeterminate="false"
        android:max="100"
        android:layout_gravity="bottom"
        style="@style/ProgressBarStyle" />
    </LinearLayout>
        </LinearLayout>

</LinearLayout>

申请

    public class MyAppName extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        initImageLoader(getApplicationContext());
    }

    public static void initImageLoader(Context context) {
        // This configuration tuning is custom. You can tune every option, you may tune some of them,
                // or you can create default configuration by
                //  ImageLoaderConfiguration.createDefault(this);
                // method.
                ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context)
                        .threadPriority(Thread.NORM_PRIORITY - 2)
                        .denyCacheImageMultipleSizesInMemory()
                        .discCacheFileNameGenerator(new Md5FileNameGenerator())
                        .tasksProcessingOrder(QueueProcessingType.LIFO)
                        .writeDebugLogs() // Remove for release app
                        .build();
                // Initialize ImageLoader with configuration.
                ImageLoader.getInstance().init(config);
    }
}

日志猫 http://pastebin.com/JejB8miC

感谢支持

Answer 1

将此 ImageAware 添加到您的项目中:

public class BgImageAware implements ImageAware {

    public static final String WARN_CANT_SET_DRAWABLE = "Can't set a drawable into view. You should call ImageLoader on UI thread for it.";
    public static final String WARN_CANT_SET_BITMAP = "Can't set a bitmap into view. You should call ImageLoader on UI thread for it.";

    protected Reference<View> viewRef;
    protected boolean checkActualViewSize;

    public BgImageAware(View view) {
        this(view, true);
    }

    public BgImageAware(View view, boolean checkActualViewSize) {
        this.viewRef = new WeakReference<View>(view);
        this.checkActualViewSize = checkActualViewSize;
    }

    @Override
    public int getWidth() {
        View view = viewRef.get();
        if (view != null) {
            final ViewGroup.LayoutParams params = view.getLayoutParams();
            int width = 0;
            if (checkActualViewSize && params != null && params.width != ViewGroup.LayoutParams.WRAP_CONTENT) {
                width = view.getWidth(); // Get actual image width
            }
            if (width <= 0 && params != null) width = params.width; // Get layout width parameter
            return width;
        }
        return 0;
    }

    @Override
    public int getHeight() {
        View view = viewRef.get();
        if (view != null) {
            final ViewGroup.LayoutParams params = view.getLayoutParams();
            int height = 0;
            if (checkActualViewSize && params != null && params.height != ViewGroup.LayoutParams.WRAP_CONTENT) {
                height = view.getHeight(); // Get actual image height
            }
            if (height <= 0 && params != null) height = params.height; // Get layout height parameter
            return height;
        }
        return 0;
    }

    @Override
    public ViewScaleType getScaleType() {
        return ViewScaleType.CROP;
    }

    @Override
    public View getWrappedView() {
        return viewRef.get();
    }

    @Override
    public boolean isCollected() {
        return viewRef.get() == null;
    }

    @Override
    public int getId() {
        View view = viewRef.get();
        return view == null ? super.hashCode() : view.hashCode();
    }

    @Override
    public boolean setImageDrawable(Drawable drawable) {
        if (Looper.myLooper() == Looper.getMainLooper()) {
            View view = viewRef.get();
            if (view != null) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                    view.setBackground(drawable);
                } else {
                    view.setBackgroundDrawable(drawable);
                }
                return true;
            }
        } else {
            L.w(WARN_CANT_SET_DRAWABLE);
        }
        return false;
    }

    @Override
    public boolean setImageBitmap(Bitmap bitmap) {
        if (Looper.myLooper() == Looper.getMainLooper()) {
            View view = viewRef.get();
            if (view != null) {
                Drawable drawable = bitmap == null ? null : new BitmapDrawable(view.getResources(), bitmap);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                    view.setBackground(drawable);
                } else {
                    view.setBackgroundDrawable(drawable);
                }
                return true;
            }
        } else {
            L.w(WARN_CANT_SET_BITMAP);
        }
        return false;
    }
}

然后将您的 LinearLayout 包装到其中并传递给 displayImage(...) 方法:

ImageAware imageAware = new BgImageAware(holder.imageView);
imageLoader.displayImage(mStrings[position], imageAware);