android-动态壁纸和扩展背景

我正在尝试创建一个动态壁纸,该动画始终位于当前主屏幕页面的中心,而不丢失扩展的背景.
我现在正在做的是绘制自定义背景位图,然后在其上绘制一些文本.

这是我的并条机方法:

        final SurfaceHolder holder = getSurfaceHolder();
        Canvas canvas = null;
        try {
            canvas = holder.lockCanvas();
            if (canvas != null) {

                if(mBackgroundBitmap != null) {
                    canvas.drawBitmap(mBackgroundBitmap, 0, 0, null);
                } else {
                    canvas.drawColor(Color.BLACK);
                }
                drawText(canvas);
            }
        }
        finally {
            if (canvas != null ) holder.unlockCanvasAndPost(canvas);
        }

它确实可以工作,但是很明显,当我在主屏幕上更改页面时,得到的背景图像是固定的,而不是像使用大墙纸时一样的“部分”.

我也尝试过在锁定画布之前设置墙纸,但是它无法正常工作:

if(mBackgroundBitmap != null) {                 
                try {
                    setWallpaper(mBackgroundBitmap);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
final SurfaceHolder holder = getSurfaceHolder();
    Canvas canvas = null;
    try {
        canvas = holder.lockCanvas();
        if (canvas != null) {
            drawText(canvas);
        }
    }
    finally {
        if (canvas != null ) holder.unlockCanvasAndPost(canvas);
    }

更改主屏幕页面时,我该怎么做才能保留大背景“移动设备”,但是在当前页面中添加一些动画?

解决方法:

我已经找到了解决方法!

    void drawFrame() {
        final SurfaceHolder holder = getSurfaceHolder();

        Canvas canvas = null;
        try {
            canvas = holder.lockCanvas();
            if (canvas != null) {
                canvas.save();
                canvas.translate((float) mxOffset, 0f);

                if(mBackgroundBitmap != null) {
                    canvas.drawBitmap(mBackgroundBitmap, 0, 0, null);
                }

                canvas.restore();
            }
        }
        finally {
            if (canvas != null ) holder.unlockCanvasAndPost(canvas);
        }
    }

mBackgroundBitmap是我要绘制为墙纸的位图,它的宽度是屏幕宽度的两倍.

mxOffsets在重写的onOffsetsChanged中获取:

    @Override
    public void onOffsetsChanged(float xOffset, float yOffset,
            float xOffsetStep, float yOffsetStep, int xPixelOffset,
            int yPixelOffset) {
        super.onOffsetsChanged(mxOffset, yOffset, xOffsetStep, yOffsetStep,
                xPixelOffset, yPixelOffset);

        mxOffset = xPixelOffset;
        drawFrame();
    }
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