Question

我在我的项目中使用Gallery。我想要的功能如下：

屏幕上一次应该可以看到5张图像。
图像数量可以动态增加或减少。
中心图像或我们可以说所选图像应该比四幅图像的其余部分大。（0,1，[2]，3,4）。
中心1的相邻图像应小于所选图像，但比角落处的图像滞后（0，[1]，2，[3]，4）。
屏幕四角的图像应小于其余图像的图像。

我不知道如何实现这一点。我已经调整了中心ImageView的大小，但我不知道如何设置四个图像的其余部分的大小。请提供此问题的解决方案。

这是我改变ImageView大小的代码

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class InfiniteGalleryResourceAdapter extends BaseAdapter {
/** The width of each child image */
private static final int G_ITEM_WIDTH = 60;
/** The height of each child image */
private static final int G_ITEM_HEIGHT = 250;


/** The context your gallery is running in (usually the activity) */
private Context mContext;
private int imageWidth;
private int imageHeight;
/** The array of resource ids to draw */
private final int[] imageIds;

public InfiniteGalleryResourceAdapter(Context c, int[] imageIds ) {

    this.mContext = c;
    this.imageIds = imageIds;
}

/**
 * The count of how many items are in this Adapter
 * This will return the max number as we want it to scroll as much as possible
 */
@Override
public int getCount() {
    return imageIds.length;
}

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // convertView is always null in android.widget.Gallery


    ImageView i = getImageView();
    int itemPos = (position % imageIds.length);

    try {
        // first we calculate the item position in your list, because we have said the adapters size is Integer.MAX_VALUE
        // the position getView gives us is not use-able in its current form, we have to use the modulus operator
        // to work out what number in our 'array of paths' this actually equals
        Log.d("item position", String.valueOf(itemPos));

        i.setImageResource(imageIds[itemPos]);
        ((BitmapDrawable) i.getDrawable()).setAntiAlias(true); // Make sure we set anti-aliasing otherwise we get jaggies (non-smooth lines)

    } catch (OutOfMemoryError e) {
        // a 'just in case' scenario
        Log.e("InfiniteGalleryResourceAdapter", "Out of memory creating imageview. Using empty view.", e);
    }

    return i;
}

/**
 * Retrieve an ImageView to be used with the Gallery
 * @return an ImageView with width and height set to DIP values
 */
private ImageView getImageView() {
    setImageDimensions();

    ImageView i = new ImageView(mContext);
    i.setLayoutParams(new Gallery.LayoutParams(imageWidth, imageHeight));
    i.setScaleType(ScaleType.CENTER_INSIDE);
    return i;
}

/**
 * Sets the dimensions for each View that is used in the gallery
 * lazily initialized so that we don't have to keep converting over and over
 */
private void setImageDimensions() {
    if (imageWidth == 0 || imageHeight == 0) {
        imageWidth = AndroidUtils.convertToPix(mContext, G_ITEM_WIDTH);
        imageHeight = AndroidUtils.convertToPix(mContext, G_ITEM_HEIGHT);
    }
}
}

Android：调整图库项目的大小

0 个答案: