android 让图片充满整个屏幕

方法1：

<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"

方法2：

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));}