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我在我的Android应用程序中调用了以下代码。当我在旧的三星Dart上运行它时(api < 13),我得到一个NullPointer异常,如下所述。基于设备屏幕大小的Android调整大小
是否有一个特定的原因代码是为它上面的四行工作,但不是它获得NullPointer的行?
@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
public void adjustSize() {
int width, height;
Display display = getWindowManager().getDefaultDisplay();
if (android.os.Build.VERSION.SDK_INT >= 13) {
Point size = new Point();
display.getSize(size);
width = size.x;
height = size.y;
} else {
width = display.getWidth(); // deprecated
height = display.getHeight(); // deprecated
}
ImageView counties = (ImageView) findViewById(R.id.btnCounties);
ImageView members = (ImageView) findViewById(R.id.btnMembers);
ImageView webLink = (ImageView) findViewById(R.id.btnWebLink);
ImageView logo = (ImageView) findViewById(R.id.logo);
// Calculate image sizes
if (height > width) {
counties.getLayoutParams().height = (int) (width/2.5);
counties.getLayoutParams().width = (int) (width/2.5);
members.getLayoutParams().height = (int) (width/2.5);
members.getLayoutParams().width = (int) (width/2.5);
webLink.getLayoutParams().height = (int) ((width/2.4)/3.5); // Null pointer error
webLink.getLayoutParams().width = (int) (width/2.4);
logo.getLayoutParams().height = (int) (height/6);
logo.getLayoutParams().width = width;
} else {
counties.getLayoutParams().height = (int) (height/2.5);
counties.getLayoutParams().width = (int) (height/2.5);
members.getLayoutParams().height = (int) (height/2.5);
members.getLayoutParams().width = (int) (height/2.5);
}
}
谢谢!这正是应用程序的错误。 – mjhouseman
它总是发生在我身上! ;) –