image.png
从log中我们可以看到，此次异常最明显的关键词是fragment和context，那么我们来一一排除，首先，确保自定义的dialog传进来的context就是外部的activity(如果是fragment调用的dialog那就确保是getActivity()),要是在这样的情况下还是出现异常的话那么肯定是fragment的问题或者是fragment本身就和Dialog/AlertDialog不兼容。
这时，我们把fragment相关的代码注释掉，发现并不会出现异常，那么我开始检查一下fragment的每一个使用步骤，这里我用的是tablayout + viewPager + fragment的方式，所以第一步我先检查fragmengManager，在这个dialog中，我用的fragmanager是从外部传进来的getChildFragmentManager(),于是乎，我把它替换成了activity里的getSupportFragmentManager()，照样闪退。无奈之下上网搜索了一下，没有一篇文章是跟Dialog或者AlertDialog这个类有直接关系的，大部分都是关于DialogFragment这个类的，偶然间我看到一篇文章Android 如何在Dialog中使用ViewPager,然后我尝试修改了一下代码，居然真的行了，太神了。
代码如下:
public class MyDialog extends DialogFragment {
@BindView(R.id.tbStudentAccess)
TabLayout tb;
@BindView(R.id.viewPagerLessonAccess)
ViewPager viewpager;
private MyAdapter pagerAdapter;
private List<String> titleList;
private List<Fragment> fragmentList;
private Context context;
public MyDialog () {
}
@SuppressLint("ValidFragment")
public MyDialog (Builder builder) {
this.context = builder.context;
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dialog_layout, container , false);
ButterKnife.bind(this , view);
initViews();
return view;
}
private void initViews() {
fragmentList = new ArrayList<>();
titleList = new ArrayList<>();
titleList.add("item1");
titleList.add("item2");
fragmentList.add(new MyFragment1());
fragmentList.add(new MyFragment2());
pagerAdapter = new MyAdapter (getChildFragmentManager() , 1 , titleList , fragmentList);
pagerAdapter.notifyDataSetChanged();
viewpager.setOffscreenPageLimit(2);
viewpager.setAdapter(pagerAdapter);
tb.setupWithViewPager(viewpager);
viewpager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tbStudentAccess));
tb.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPagerLessonAccess.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
@Override
public void onStart() {
super.onStart();
Window window = getDialog().getWindow();
if (window != null) {
// 一定要设置Background，如果不设置，window属性设置无效，这条语句也可用来设置根布局的颜色和形状
window.setBackgroundDrawable(ContextCompat.getDrawable(context , R.drawable.shape_lesson_access_student_dialog));
DisplayMetrics dm = new DisplayMetrics();
if (getActivity() != null) {
WindowManager windowManager = getActivity().getWindowManager();
if (windowManager != null) {
windowManager.getDefaultDisplay().getMetrics(dm);
WindowManager.LayoutParams params = window.getAttributes();
params.gravity = Gravity.CENTER;
// 使用ViewGroup.LayoutParams，以便Dialog 宽度充满整个屏幕
params.width = ScreenUtils.getScreenWidth() - SizeUtils.dp2px(40);
params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
window.setAttributes(params);
}
}
}
}
public static class Builder{
private Context context;
private String studentName;
private DialogInterface.OnCancelListener onCancelListener;
public Builder(Context context) {
this.context = context;
}
public Builder setStudentName(String studentName) {
this.studentName = studentName;
return this;
}
public Builder setOnCancelListener(DialogInterface.OnCancelListener onCancelListener) {
this.onCancelListener = onCancelListener;
return this;
}
public MyDialog build(){
if(TextUtils.isEmpty(studentName)){
throw new IllegalArgumentException("studentName is null");
}
return new MyDialog (this);
}
}
}
