Android：調整可繪製的大小

Question

我正在開發一個android應用程序，我想減少我的icones。 我已經嘗試了不同的方式，但每次返回的drawable的密度都很低。 但是，當我在photoshop上調整同一圖像時，它會保持良好的密度。 下面的代碼是我找到的最好的。

請問你能幫我改進嗎？

public class MainActivity extends Activity { 


@Override 
protected void onCreate(Bundle savedInstanceState) { 


    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    ImageView newImage = (ImageView) findViewById(R.id.image); 

    Bitmap unscaledBitmap = decodeResource(getBaseContext().getResources(),R.drawable.test2, 120, 120, ScalingLogic.FIT); 

      newImage.setImageBitmap(createScaledBitmap(unscaledBitmap, 120, 120, ScalingLogic.FIT)); 
    newImage.setImageBitmap(createScaledBitmap(unscaledBitmap, 120, 120, ScalingLogic.FIT)); 



} 

public static Bitmap decodeResource(Resources res, int resId, int dstWidth, int dstHeight, 
     ScalingLogic scalingLogic) { 
     BitmapFactory.Options options = new BitmapFactory.Options(); 
     options.inJustDecodeBounds = true; 
     BitmapFactory.decodeResource(res, resId, options); 
     options.inJustDecodeBounds = false; 
     options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, dstWidth, 
       dstHeight, scalingLogic); 
     Bitmap unscaledBitmap = BitmapFactory.decodeResource(res, resId, options); 

     return unscaledBitmap; 
    } 


    public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int dstWidth, int dstHeight, 
    ScalingLogic scalingLogic) { 
     Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), 
       dstWidth, dstHeight, scalingLogic); 
     Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), 
       dstWidth, dstHeight, scalingLogic); 
     Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(), 
       Bitmap.Config.RGB_565); 
     Canvas canvas = new Canvas(scaledBitmap); 
     canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG)); 

     return scaledBitmap; 
    } 


    public static enum ScalingLogic { 
     CROP, FIT 
    } 


    public static int calculateSampleSize(int srcWidth, int srcHeight, int dstWidth, int dstHeight, 
    ScalingLogic scalingLogic) { 
     if (scalingLogic == ScalingLogic.FIT) { 
      final float srcAspect = (float)srcWidth/(float)srcHeight; 
      final float dstAspect = (float)dstWidth/(float)dstHeight; 

      if (srcAspect > dstAspect) { 
       return srcWidth/dstWidth; 
      } else { 
       return srcHeight/dstHeight; 
      } 
     } else { 
      final float srcAspect = (float)srcWidth/(float)srcHeight; 
      final float dstAspect = (float)dstWidth/(float)dstHeight; 

      if (srcAspect > dstAspect) { 
       return srcHeight/dstHeight; 
      } else { 
       return srcWidth/dstWidth; 
      } 
     } 
    } 


    public static Rect calculateSrcRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight, 
    ScalingLogic scalingLogic) { 
     if (scalingLogic == ScalingLogic.CROP) { 
      final float srcAspect = (float)srcWidth/(float)srcHeight; 
      final float dstAspect = (float)dstWidth/(float)dstHeight; 

      if (srcAspect > dstAspect) { 
       final int srcRectWidth = (int)(srcHeight * dstAspect); 
       final int srcRectLeft = (srcWidth - srcRectWidth)/2; 
       return new Rect(srcRectLeft, 0, srcRectLeft + srcRectWidth, srcHeight); 
      } else { 
       final int srcRectHeight = (int)(srcWidth/dstAspect); 
       final int scrRectTop = (int)(srcHeight - srcRectHeight)/2; 
       return new Rect(0, scrRectTop, srcWidth, scrRectTop + srcRectHeight); 
      } 
     } else { 
      return new Rect(0, 0, srcWidth, srcHeight); 
     } 
    } 


    public static Rect calculateDstRect(int srcWidth, int srcHeight, int dstWidth, int dstHeight, 
    ScalingLogic scalingLogic) { 
     if (scalingLogic == ScalingLogic.FIT) { 
      final float srcAspect = (float)srcWidth/(float)srcHeight; 
      final float dstAspect = (float)dstWidth/(float)dstHeight; 

      if (srcAspect > dstAspect) { 
       return new Rect(0, 0, dstWidth, (int)(dstWidth/srcAspect)); 
      } else { 
       return new Rect(0, 0, (int)(dstHeight * srcAspect), dstHeight); 
      } 
     } else { 
      return new Rect(0, 0, dstWidth, dstHeight); 
     } 
    } 

    } 

Answer 1

我認爲您需要使用9貼片圖像，您將在其中定義可拉伸區域。這些區域在區域周圍的特殊1像素寬的邊界中定義，因爲除了圖像的其餘部分之外，自定義繪製的按鈕可能看起來扭曲和像素化，而另一方面，9貼片圖像分別縮放。對於具有不同分辨率和長寬比的較小屏幕的移動設備而言，這非常方便。看看這example