通话界面的功能按钮无法显示，要使它显示出来
1、通过AndroidStudio的Layout Inspector查看UI结构
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通过该功能可以基本判断出它位于id为incall_ui_container的incall_pager里面
2、开始跟踪代码
- incall_screen.xml.xml -->InCallActivity.java --> R.id.main
- transaction.add(R.id.main, inCallScreen.getInCallScreenFragment(), Tags.IN_CALL_SCREEN);
- InCallScreen接口，找到它的实现类-->InCallFragment.java
- layoutInflater.inflate(R.layout.frag_incall_voice, viewGroup, false)); -->找到布局文件 frag_incall_voice.xml
- frag_incall_voice.xml-->R.id.incall_pager 类型为LockableViewPager.java
- R.id.incall_pager被设置pager.setAdapter(adapter); 类型为InCallPagerAdapter.java
- getItem的实现return InCallButtonGridFragment.newInstance(position);
- 打开InCallButtonGridFragment
71 @Override 72 public View onCreateView( 73 LayoutInflater inflater, @Nullable ViewGroup parent, @Nullable Bundle bundle) { 74 View view = inflater.inflate(R.layout.incall_button_grid, parent, false); 75 76 buttons[0] = ((CheckableLabeledButton) view.findViewById(R.id.incall_first_button)); 77 buttons[1] = ((CheckableLabeledButton) view.findViewById(R.id.incall_second_button)); 78 buttons[2] = ((CheckableLabeledButton) view.findViewById(R.id.incall_third_button)); 79 buttons[3] = ((CheckableLabeledButton) view.findViewById(R.id.incall_fourth_button)); 80 buttons[4] = ((CheckableLabeledButton) view.findViewById(R.id.incall_fifth_button)); 81 buttons[5] = ((CheckableLabeledButton) view.findViewById(R.id.incall_sixth_button)); 82 83 return view; 84 }
