Android：如何在保持宽高比的同时将图像拉伸到屏幕宽度？

Question

我想下载一个图像（大小不明，但始终大致为正方形）并显示它，以便它在任何屏幕尺寸上都水平填充屏幕，并垂直拉伸以保持图像的纵横比。这是我的（无效）代码。它水平拉伸图像，但不垂直拉伸图像，因此将其压扁...

ImageView mainImageView = new ImageView(context);

    mainImageView.setImageBitmap(mainImage); //downloaded from server

    mainImageView.setScaleType(ScaleType.FIT_XY);

    //mainImageView.setAdjustViewBounds(true); 

    //with this line enabled, just scales image down

    addView(mainImageView,new LinearLayout.LayoutParams( 

            LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

Answer 1

我使用自定义视图完成了此操作。设置layout_width =“ fill_parent”和layout_height =“ wrap_content”，并将其指向适当的可绘制对象：public class Banner extends View {  private final Drawable logo;  public Banner(Context context) {    super(context);    logo = context.getResources().getDrawable(R.drawable.banner);    setBackgroundDrawable(logo);  }  public Banner(Context context, AttributeSet attrs) {    super(context, attrs);    logo = context.getResources().getDrawable(R.drawable.banner);    setBackgroundDrawable(logo);  }  public Banner(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    logo = context.getResources().getDrawable(R.drawable.banner);    setBackgroundDrawable(logo);  }  @Override protected void onMeasure(int widthMeasureSpec,      int heightMeasureSpec) {    int width = MeasureSpec.getSize(widthMeasureSpec);    int height = width * logo.getIntrinsicHeight() / logo.getIntrinsicWidth();    setMeasuredDimension(width, height);  }}

Answer 2

最后，我手动生成了尺寸，效果很好：DisplayMetrics dm = new DisplayMetrics();context.getWindowManager().getDefaultDisplay().getMetrics(dm);int width = dm.widthPixels;int height = width * mainImage.getHeight() / mainImage.getWidth(); //mainImage is the Bitmap I'm drawingaddView(mainImageView,new LinearLayout.LayoutParams(         width, height));