android - 在android drawable中调整图像大小

Question

我在可绘制文件夹中有全分辨率图像需要根据手机屏幕尺寸调整大小怎么做？

Answer 1

像这样做

/************************ Calculations for Image Sizing *********************************/ 
public Drawable ResizeImage (int imageID) { 
//Get device dimensions 
Display display = getWindowManager().getDefaultDisplay(); 
double deviceWidth = display.getWidth(); 

BitmapDrawable bd=(BitmapDrawable) this.getResources().getDrawable(imageID); 
double imageHeight = bd.getBitmap().getHeight(); 
double imageWidth = bd.getBitmap().getWidth(); 

double ratio = deviceWidth / imageWidth; 
int newImageHeight = (int) (imageHeight * ratio); 

Bitmap bMap = BitmapFactory.decodeResource(getResources(), imageID); 
Drawable drawable = new BitmapDrawable(this.getResources(),getResizedBitmap(bMap,newImageHeight,(int) deviceWidth)); 

return drawable; 
} 

/************************ Resize Bitmap *********************************/ 
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) { 

int width = bm.getWidth(); 
int height = bm.getHeight(); 

float scaleWidth = ((float) newWidth) / width; 
float scaleHeight = ((float) newHeight) / height; 

// create a matrix for the manipulation 
Matrix matrix = new Matrix(); 

// resize the bit map 
matrix.postScale(scaleWidth, scaleHeight); 

// recreate the new Bitmap 
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false); 

return resizedBitmap; 
}

Answer 2

要获得宽度，您应该这样做：

Display display = getWindowManager().getDefaultDisplay();
double deviceWidth;
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB_MR1)
            deviceWidth= display.getWidth();
        else {
            display.getSize(size);
            deviceWidth=size.x;
        }