我想下載一個(gè)圖像（大小不明，但始終大致為正方形）并顯示它，以便它在任何屏幕尺寸上都水平填充屏幕，并垂直拉伸以保持圖像的縱橫比。這是我的（無(wú)效）代碼。它水平拉伸圖像，但不垂直拉伸圖像，因此將其壓扁...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));
3 回答
隔江千里
TA貢獻(xiàn)1906條經(jīng)驗(yàn) 獲得超10個(gè)贊
我使用自定義視圖完成了此操作。設(shè)置layout_width =“ fill_parent”和layout_height =“ wrap_content”，并將其指向適當(dāng)?shù)目衫L制對(duì)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);
}
}
青春有我
TA貢獻(xiàn)1784條經(jīng)驗(yàn) 獲得超8個(gè)贊
最后，我手動(dòng)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));
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