在我的App的最新版本中,我添加了proguard。一个奇怪的错误开始出现:
Fatal Exception: java.lang.NullPointerException
Attempt to invoke virtual method 'java.lang.String com.siplay.myapp.b.e.e.b()' on a null object reference
错误在以下行中触发:
public boolean isVideo() {
return Media.MEDIA_TYPE_VIDEO.equals(mImage.getType());
}
MEDIA_TYPE_VIDEO
是一个常量,声明如下:public class Media implements Parcelable {
...
public static final String MEDIA_TYPE_VIDEO = "video";
...
@Retention(RetentionPolicy.SOURCE)
@StringDef({Media.MEDIA_TYPE_VIDEO, Media.MEDIA_TYPE_PHOTO, Media.MEDIA_TYPE_THUMB})
public @interface MediaTypes {}
...
public void setType(@MediaTypes String type) {
...
}
我在许多帖子中读到Proguard不会混淆常量声明。但是,它必须是已废除的常量或
mImage
对象。 stacktrace告诉我,在初始化视图后立即触发了该NPE:public class MyFragment extends Fragment {
...
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
mImage = savedInstanceState.getParcelable(Constants.BUNDLE_IMAGE);
...
}
mVideoLoader.setVisibility(View.GONE);
if (isVideo()) { //HERE
...
}
...
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelable(Constants.BUNDLE_IMAGE, mImage);
...
}
}
也许是因为我迷上了onActivityCreated而发生了?
最佳答案
将com.example
替换为Media
类的基本包,并将其放入
proguard文件中的行
-keep class com.example.** { *; }
关于android - 捍卫者缩小了我的常数吗?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/44288187/