如何以编程方式填充方面?(Android)

Question

我想要Aspect Fill我的图像。我的图像的大小是1242x168。我想要的是，如果我的屏幕很小，我的图像将被剪切并左对齐，但它似乎一直是aspect fit。

我的代码

DisplayMetrics displaymetrics = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
            int device_width = displaymetrics.widthPixels;
float density  = getResources().getDisplayMetrics().density;
            float dpWidth  = displaymetrics.widthPixels / density;
if(dpWidth >= 768) {
                int aspectRatio = (int) (0.135 * device_width);
                gifImageView.getLayoutParams().height = aspectRatio;
                gifImageView.getLayoutParams().width = device_width;
            }

这是我的xml

<pl.droidsonroids.gif.GifImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/displayImage"
    android:layout_gravity="left"
    android:scaleType="fitStart"
    android:background="@color/red"
    android:adjustViewBounds="true"
    />

我尝试使用android:scaleType="centerCrop"，但它是农作物在中心，我想削减右边，这就是为什么我想左对齐。

Answer 1

尝试根据屏幕宽度缩放图像:

public static float getScreenWidth(Activity activity) {
    Display display = activity.getWindowManager().getDefaultDisplay();
    DisplayMetrics outMetrics = new DisplayMetrics();
    display.getMetrics(outMetrics);
    float pxWidth = outMetrics.widthPixels;
    return pxWidth;
}
float screenWidth=getScreenWidth(act)
float newHeight = screenWidth;
if (bitmap.getWidth() != 0 && bitmap.getHeight() != 0) {
 newHeight = (screenWidth * bitmap.getHeight()) / bitmap.getWidth();
}
Bitmap scaledBitmap=Bitmap.createScaledBitmap(bitmap, (int) screenWidth, (int) newHeight, true);
android:adjustViewBounds=true.
android:scaleType="centerCrop"

链接:调整ImageView的大小以适应宽高比;https://gist.github.com/JakeWharton/2856179

Answer 2

我试过了

//Get width of device
    DisplayMetrics displaymetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
    float density  = getResources().getDisplayMetrics().density;
    float dpWidth  = displaymetrics.widthPixels / density;
   if(dpWidth > 768 ) { 
      int aspectRatio = (int) (0.135 * device_width);
      gifImageView.getLayoutParams().height = aspectRatio;
      gifImageView.getLayoutParams().width = device_width;
      gifImageView.setIsScale(false);
    }else{
        int aspectRatio = (int) (0.219 * device_width);
        gifImageView.getLayoutParams().height = aspectRatio;
        gifImageView.getLayoutParams().width = device_width;
     gifImageView.setScaleType(ProportionalImageView.ScaleType.MATRIX);
        gifImageView.setIsScale(true);
    }

创建一个自定义类，扩展到ImageView/GifImageView

 public class ProportionalImageView extends GifImageView {
Boolean isScale = false;
public ProportionalImageView(Context context) {
    super(context);
    if(isScale) {
        setup();
    }
}
public ProportionalImageView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    if(isScale) {
        setup();
    }
}
public ProportionalImageView(Context context, AttributeSet attrs, int defStyle)
{
    super(context, attrs, defStyle);
    if(isScale) {
        setup();
    }
}
private void setup() {
    setScaleType(ScaleType.MATRIX);
}
@Override
protected boolean setFrame(int l, int t, int r, int b)
{
    if(isScale) {
        computeMatrix();
    }
    return super.setFrame(l, t, r, b);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    super.onLayout(changed, left, top, right, bottom);
    if(isScale) {
        computeMatrix();
    }
}
private void computeMatrix() {
    Matrix matrix = getImageMatrix();
    float scaleFactor, scaleFactorWidth, scaleFactorHeight;
    scaleFactorWidth = (float) getWidth() / (float) getDrawable().getIntrinsicWidth();
    scaleFactorHeight = (float) getHeight() / (float) getDrawable().getIntrinsicHeight();
    if (scaleFactorHeight > scaleFactorWidth) {
        scaleFactor = scaleFactorHeight;
    } else {
        scaleFactor = scaleFactorWidth;
    }
    matrix.setScale(scaleFactor, scaleFactor, 0, 0);
    setImageMatrix(matrix);
}
public void setIsScale(Boolean isScale){
    this.isScale = isScale;
}
public Boolean getIsScale() {
    return isScale;
}
}