SurfaceView加载长图

package com.guoxw.surfaceviewimage;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.util.Timer;
import java.util.TimerTask;

/**
 * Created by guoxw on 2017/12/6.
 * SurfaceView 加载长图缓慢移动显示，充当背景。
 */

public class SurfaceViewImage extends SurfaceView implements SurfaceHolder.Callback {

    private static final String TAG = "SurfaceViewTest1";
    private SurfaceHolder surfaceHolder = null;
    private int imageH = 0, imageW = 0;
    private Bitmap bitmap = null;
    private Paint mBitPaint = null;
    /***每次移动相对于起始点的距离*/
    private int gap = 0;
    private Timer timer;
    private TimerTask timerTask;
    private int surfaceW, surfaceH;
    private ScroListener scroListener = null;
    private Canvas canvas;
    /***设置透明度  0-255 */
    private int alphaValueAdd = 0;
    private int alphaValueDec = 255;
    private boolean isVisibility = true;
    private int transType = 1;

    public SurfaceViewImage(Context context, AttributeSet attrs) {
        super(context, attrs);
        Log.d(TAG, "SurfaceViewTest1: ");
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.bannerbg2);
        imageH = bitmap.getHeight();
        imageW = bitmap.getWidth();
        mBitPaint = new Paint();
        mBitPaint.setColor(Color.RED);
        mBitPaint.setAlpha(alphaValueDec);
        Log.d(TAG, "SurfaceViewTest1: --寛高：" + imageW + "--" + imageH);
        surfaceHolder = getHolder();
        surfaceHolder.addCallback(this);


    }


    private void imageDraw() {
        Log.d(TAG, "imageDraw: ");
        switch (transType) {
            case 1:
                canvas = surfaceHolder.lockCanvas(new Rect(0, 0, surfaceW, surfaceW));
                if (gap < (imageW - surfaceW)) {
                    if (alphaValueAdd <= 255) {
                        alphaValueAdd += 5;
                    } else {
                        gap += 1;
                    }
                } else if (gap >= (imageW - surfaceW)) {
                    alphaValueDec -= 5;
                    scroListener.scroTopListener();
                    if (alphaValueDec == 0) {
                        Log.d(TAG, "imageDraw: 次数- 000");
                        // scroListener.scroTopListener();
                    }
                }
                if (alphaValueAdd <= 255) {
                    mBitPaint.setAlpha(alphaValueAdd);
                } else {
                    mBitPaint.setAlpha(alphaValueDec);
                }
                Rect srcRect = new Rect(0 + gap, 1000, surfaceW + gap, surfaceH + 1000);
                Rect dstRect = new Rect(0, 0, surfaceW, surfaceH);
                Log.d(TAG, "imageDraw: image数据alpha值：--" + alphaValueDec);
                canvas.drawBitmap(bitmap, srcRect, dstRect, mBitPaint);
                surfaceHolder.unlockCanvasAndPost(canvas);
                break;
            case 2:
                break;
            case 3:
                break;
        }

    }


    public void setBitmap(Bitmap bitmap) {
        resetImageData();
        this.bitmap = bitmap;
    }

    private void resetImageData() {
        imageH = bitmap.getHeight();
        imageW = bitmap.getWidth();
        gap = 0;
        alphaValueDec = 255;
        alphaValueAdd = 0;
    }


    /**
     * 移动完时，设置监听，更换image
     * @param scroListener
     */
    public void setScroListener(ScroListener scroListener) {
        this.scroListener = scroListener;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        surfaceH = getHeight();
        surfaceW = getWidth();
        Log.d(TAG, "surfaceCreated: 控件的寛高：" + surfaceW + "---" + surfaceH); // 1196*574
        timer = new Timer();
        timerTask = new TimerTask() {
            @Override
            public void run() {

                while (isVisibility) {
                    imageDraw();
                }


            }
        };
        timer.schedule(timerTask, 100, 60);

    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

        Log.d(TAG, "surfaceChanged: ");

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.d(TAG, "surfaceDestroyed: ");
        try {
            Canvas canvas = surfaceHolder.lockCanvas(null);
            canvas.drawColor(Color.BLACK);
            surfaceHolder.unlockCanvasAndPost(canvas);
        } catch (Exception ex) {
        }


    }


    public interface ScroListener {
        void scroTopListener();
    }


    public void destory() {

        if (timer != null) {
            timer.cancel();
            timerTask = null;
            timer = null;
        }

    }

}

https://pan.baidu.com/s/1o7XYOsy     SurfaceViewImage.zip