how to draw scroll background in live wallpaper in android?

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Mobile

Android

Hi All
I am new to developing live wallpaper i want to move background sky continuously for that i have use below code but it is work smoothly in 2.3device but below and above 2.3 devise it getting jerks please help me to solve this problem.

private int mBGFarMoveX = 0;
private int mBGNearMoveX = 0;

mBGFarMoveX = mBGFarMoveX - 2;

// decrement the near background
mBGNearMoveX = mBGNearMoveX - 4;

if (newFarX <= 0) {
mBGFarMoveX = 0;

canvas.drawBitmap(backGround, mBGFarMoveX, 0, null);
canvas.drawBitmap(bmp, 20,20,null);

}
else {
// need to draw original and wrap

canvas.drawBitmap(backGround, mBGFarMoveX, 0, null);
canvas.drawBitmap(backGround, newFarX, 0, null);
canvas.drawBitmap(bmp, 20, 20,null);
}

and i have use invalidate method in ondraw(canvas);