我发现了这个类：

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;


// borrowed from https://sites.google.com/site/androidhowto/how-to-1/custom-scrollable-image-view
public class ScrollImageView extends View {
    private final int DEFAULT_PADDING = 10;
    private Display mDisplay;
    private Bitmap mImage;

    /* Current x and y of the touch */
    private float mCurrentX = 0;
    private float mCurrentY = 0;

    private float mTotalX = 0;
    private float mTotalY = 0;
    /* The touch distance change from the current touch */
    private float mDeltaX = 0;
    private float mDeltaY = 0;

    int mDisplayWidth;
    int mDisplayHeight;
    int mPadding;

    public ScrollImageView(Context context) {
        super(context);
        initScrollImageView(context);
    }

    public ScrollImageView(Context context, AttributeSet attributeSet) {
        super(context);
        initScrollImageView(context);
    }

    private void initScrollImageView(Context context) {
        mDisplay = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        mPadding = DEFAULT_PADDING;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = measureDim(widthMeasureSpec, mDisplay.getWidth());
        int height = measureDim(heightMeasureSpec, mDisplay.getHeight());
        setMeasuredDimension(width, height);
    }

    private int measureDim(int measureSpec, int size) {
        int result = 0;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if (specMode == MeasureSpec.EXACTLY) {
            result = specSize;
        } else {
            result = size;
            if (specMode == MeasureSpec.AT_MOST) {
               result = Math.min(result, specSize);
            }
        }
        return result;
    }

    public Bitmap getImage() {
        return mImage;
    }

    public void setImage(Bitmap image) {
        mImage = image;
    }

    public int getPadding() {
        return mPadding;
    }

    public void setPadding(int padding) {
        this.mPadding = padding;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            mCurrentX = event.getRawX();
            mCurrentY = event.getRawY();
        } 
        else if (event.getAction() == MotionEvent.ACTION_MOVE) {
            float x = event.getRawX();
            float y = event.getRawY();

            // Update how much the touch moved
            mDeltaX = x - mCurrentX;
            mDeltaY = y - mCurrentY;

            mCurrentX = x;
            mCurrentY = y;

            invalidate();
        }
        // Consume event
        return true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mImage == null) {
            return;
        }

        float newTotalX = mTotalX + mDeltaX;

        // Don t scroll off the left or right edges of the bitmap.
        if (mPadding > newTotalX && newTotalX > getMeasuredWidth() - mImage.getWidth() - mPadding)
            mTotalX += mDeltaX;

        float newTotalY = mTotalY + mDeltaY;

        // Don t scroll off the top or bottom edges of the bitmap.
        if (mPadding > newTotalY && newTotalY > getMeasuredHeight() - mImage.getHeight() - mPadding)
            mTotalY += mDeltaY;

        Paint paint = new Paint();
        canvas.drawBitmap(mImage, mTotalX, mTotalY, paint);
    }
}

我不知道如何在我的应用程序中使用它。

我希望我的应用程序在横向方向上显示一个可垂直和水平滚动的位图图像。我从URL中提取图像，并用程序将其制作成位图。我调用了一个返回位图图像的方法。

有什么想法吗？