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 drawing

addView(mainImageView,new LinearLayout.LayoutParams( 

        width, height));