android - ImageView 未按预期填充父级

Question

我有一个 ImageView ，我已将其设置为 fill_parent 并将 scaleType 设置为 fitCenter - 但是它似乎没有按预期填充到屏幕边缘。我不确定为什么会这样——但它看起来很奇怪。

非常感谢任何输入。

截图:

<?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="fill_parent"
    android:orientation="vertical" >

    <com.idg.omv.ui.widget.UrlImageView
        android:id="@+id/userVideoThumbImageView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@android:color/black"
        android:clickable="false"
        android:contentDescription="YouTube video thumbnail"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:gravity="center"
        android:scaleType="fitCenter"
        android:src="@drawable/ic_launcher" />

    <View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:visibility="invisible" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/userVideoTitleTextView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="5dip"
            android:text="Video Title Not Found"
            android:textColor="@android:color/black"
            android:textSize="20sp" />

        <Button
            android:id="@+id/fav_up_btn1"
            android:layout_width="27dp"
            android:layout_height="27dp"
            android:layout_alignParentRight="true"
            android:background="@drawable/fav_up_btn1"
            android:clickable="false"
            android:focusable="false"
            android:focusableInTouchMode="false"
            android:gravity="right"
            android:paddingRight="5dp"
            android:paddingTop="5dp" />
    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/userVideouploaderTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="5dip"
            android:textColor="@color/textlightgrey"

            android:textSize="16sp" />

        <TextView
            android:id="@+id/userVideoviewsTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/userVideouploaderTextView"
            android:textColor="@android:color/black"
            android:textSize="16sp" />
    </RelativeLayout>

Java:

public class UrlImageView extends LinearLayout {

    private Context mContext;
    private Drawable mDrawable;
    private ProgressBar mSpinner;
    private ImageView mImage;

    public UrlImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public UrlImageView(Context context) {
        super(context);
        init(context);
    }

    /**
     * First time loading of the LoaderImageView
     * Sets up the LayoutParams of the view, you can change these to
     * get the required effects you want
     */
    private void init(final Context context) {
        mContext = context;

        mImage = new ImageView(mContext);
        mImage.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        mImage.setVisibility(View.GONE);

        mSpinner = new ProgressBar(mContext);
        mSpinner.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

        mSpinner.setIndeterminate(true);

        addView(mSpinner);
        addView(mImage);
    }

    /**
     * Set's the view's drawable, this uses the internet to retrieve the image
     * don't forget to add the correct permissions to your manifest
     * 
     * @param imageUrl the url of the image you wish to load
     */
    public void setImageDrawable(final String imageUrl) {
        mDrawable = null;
        mSpinner.setVisibility(View.VISIBLE);
        mImage.setVisibility(View.GONE);

        new Thread() {
            public void run() {
                try {
                    mDrawable = getDrawableFromUrl(imageUrl);
                    imageLoadedHandler.sendEmptyMessage(RESULT_OK);
                } catch (MalformedURLException e) {
                    imageLoadedHandler.sendEmptyMessage(RESULT_CANCELED);
                } catch (IOException e) {
                    imageLoadedHandler.sendEmptyMessage(RESULT_CANCELED);
                }
            };
        }.start();
    }

    /**
     * Callback that is received once the image has been downloaded
     */
    private final Handler imageLoadedHandler = new Handler(new Callback() {
        @Override
        public boolean handleMessage(Message msg) {
            switch (msg.what) {
            case RESULT_OK:
                mImage.setImageDrawable(mDrawable);
                mImage.setVisibility(View.VISIBLE);

                mSpinner.setVisibility(View.GONE);
                break;
            case RESULT_CANCELED:
            default:
                // Could change image here to a 'failed' image
                // otherwise will just keep on spinning
                break;
            }
            return true;
        }
    });

    /**
     * Pass in an image url to get a drawable object
     * 
     * @return a drawable object
     * @throws IOException
     * @throws MalformedURLException
     */
    private static Drawable getDrawableFromUrl(final String url) throws IOException, MalformedURLException {
        return Drawable.createFromStream(((java.io.InputStream) new java.net.URL(url).getContent()), "name");
    }

}

Answer 1

您可能想改用 android:scaleType="centerCrop"。