使图像适合屏幕，而不会在android中失真

Question

我想将900x150的图像放到1280x800的屏幕中，而不会失真..任何帮助都将是gr8 ..这是我的main.xml文件

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ScrollView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <RelativeLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ImageView
    android:id="@+id/imageView1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:scaleType="centerCrop"
    android:contentDescription="@string/mypicture"
    android:src="@drawable/MyImage"
        />
    </RelativeLayout>
   </ScrollView>
 </LinearLayout>

Answer 1

您可能应该使用fitCenter而不是centerCrop

Answer 2

您可以根据宽高比缩放图像。 或者我看到您已经使用滚动视图简单地将包裹内容用于图像大小，它将完全显示图片而不会失真...

编辑

private void scaleImage()
{
    // Get the ImageView and its bitmap
    ImageView view = (ImageView) findViewById(R.id.image_box);
    Drawable drawing = view.getDrawable();
    if (drawing == null) {
        return; // Checking for null & return, as suggested in comments
    }
    Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();

    // Get current dimensions AND the desired bounding box
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    int bounding = dpToPx(250);
    Log.i("Test", "original width = " + Integer.toString(width));
    Log.i("Test", "original height = " + Integer.toString(height));
    Log.i("Test", "bounding = " + Integer.toString(bounding));

    // Determine how much to scale: the dimension requiring less scaling is
    // closer to the its side. This way the image always stays inside your
    // bounding box AND either x/y axis touches it.  
    float xScale = ((float) bounding) / width;
    float yScale = ((float) bounding) / height;
    float scale = (xScale <= yScale) ? xScale : yScale;
    Log.i("Test", "xScale = " + Float.toString(xScale));
    Log.i("Test", "yScale = " + Float.toString(yScale));
    Log.i("Test", "scale = " + Float.toString(scale));

    // Create a matrix for the scaling and add the scaling data
    Matrix matrix = new Matrix();
    matrix.postScale(scale, scale);

    // Create a new bitmap and convert it to a format understood by the ImageView 
    Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
    width = scaledBitmap.getWidth(); // re-use
    height = scaledBitmap.getHeight(); // re-use
    BitmapDrawable result = new BitmapDrawable(scaledBitmap);
    Log.i("Test", "scaled width = " + Integer.toString(width));
    Log.i("Test", "scaled height = " + Integer.toString(height));

    // Apply the scaled bitmap
    view.setImageDrawable(result);

    // Now change ImageView's dimensions to match the scaled image
    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams(); 
    params.width = width;
    params.height = height;
    view.setLayoutParams(params);

    Log.i("Test", "done");
}

private int dpToPx(int dp)
{
    float density = getApplicationContext().getResources().getDisplayMetrics().density;
    return Math.round((float)dp * density);
}