以編程方式設置ImageView Drawable

Question

我試圖以編程方式從可繪制數組中設置ImageView的圖像，但一直得到NUllPointerException ....此方法對於設置Image資源看起來是否正確。

//get a random drawable
int[] imageSelection= {R.drawable.buddycheck, R.drawable.logdive3, R.drawable.sea, R.drawable.weather, R.drawable.logo1};
Random whichImage = new Random();
int theImage = whichImage.nextInt(imageSelection.length);

displayImage.setBackgroundResource(theImage);

Answer 1

您正在將圖像資源設置為隨機數。 您需要這樣做：

int theImage = imageSelection[whichImage.nextInt(imageSelection.length)];
displayImage.setBackgroundResource(theImage);

Answer 2

試試這個： imageView.setImageResource(R.drawable.image);