android – 裁剪到正方形

Bitmap target= Bitmap.createBitmap(width,height,Config.ARGB_8888);
Canvas canvas = new Canvas(target) 
float hScale = width/(float)source.getWidth();
float vScale = height/(float)source.getHeight();
float scale = Math.min(hScale,vScalE);
Matrix matrix = new Matrix();
matrix.setScale(scale,scalE);
matrix.postTranslate(width/2 - source.getWidth()/2 * scale,height/2 - source.getHeight()/2 * scalE);
canvas.drawColor(Color.bLACK);
canvas.drawBitmap(source,matrix,new Paint());