<ImageView

        android:id="@+id/imageView1"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:scaleType="fitXY"

        android:src="@drawable/lbhao" />

以上是代码：只需加入在ImageView中加入这个代码即可android:scaleType="fitXY"

public static Bitmap FitTheScreenSizeImage(Bitmap m,int ScreenWidth, int ScreenHeight)

{

        float width  = (float)ScreenWidth/m.getWidth();

        float height = (float)ScreenHeight/m.getHeight();

        Matrix matrix = new Matrix();

        matrix.postScale(width,height);

        return Bitmap.createBitmap(m, , , m.getWidth(), m.getHeight(), matrix, true);

 }

float width  = (float)ScreenWidth/m.getWidth();        屏宽/图宽

float height = (float)ScreenHeight/m.getHeight();    屏高/图高

Matrix matrix = new Matrix();                矩阵对象

matrix.postScale(width,height);            把缩放系数传入该对象中

return Bitmap.createBitmap(m, , , m.getWidth(), m.getHeight(), matrix, true);        创建一张图片

参数分别是：

图片对象、x、y、w、h、矩阵对象、是否开启抗锯齿

setContentView(FitTheScreenSizeImage(R.drawable.welcomeview,screenWidth,screenHeigh));}