[英]Fragment detach method doesn't stop camera preview
我有這個布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/DeepSkyBlue"
tools:context=".MainPreviewActivity"
android:weightSum="5">
<FrameLayout
android:id="@+id/clean_preview_fragment_container"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="3"/>
<ListView
android:layout_height="0dp"
android:layout_weight="2"
android:layout_width="match_parent"
android:id="@+id/lvImageProcessChoices"/>
</LinearLayout>
在我的活動中我得到了這個:
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
if(savedInstanceState != null){
System.out.println("savedInstanceState is NOT null");
return;
}
CleanPreviewFragment cleanPreviewFragment = new CleanPreviewFragment();
processedPreviewFragment = new ProcessedPreviewFragment();
fragmentTransaction.add(R.id.clean_preview_fragment_container,cleanPreviewFragment);
fragmentTransaction.detach(cleanPreviewFragment);
fragmentTransaction.replace(R.id.clean_preview_fragment_container, processedPreviewFragment);
fragmentTransaction.attach(cleanPreviewFragment);
fragmentTransaction.commit();
現在這樣做,它開始一個相機預覽(在干凈的預覽片段上),分離它並用另一個預覽替換它,這是我修改過的預覽,然后再次附加它(干凈的預覽片段)。
Detach():從UI中分離給定的片段。 這與將其放在后台堆棧時的狀態相同:片段從UI中刪除,但其狀態仍由片段管理器主動管理。
所以我拆開它,但相機預覽仍然繼續?
因為當替換發生時,我可以看到修改后的預覽。 這是由attach()方法引起的嗎?
最后想要的片段應該在comit之前調用。 如果你不想保留它,也不要調用addToBackStack方法developer.android.com/intl/ko/training/basics/fragments/
我一周前遇到了同樣的問題。但我通過使用.replace()方法解決了這個問題。
嘗試以下,我100%確定您的問題將得到解決。
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack if needed
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
這個以上代碼的參考請在鏈接下方打開
http://developer.android.com/training/basics/fragments/fragment-ui.html
所以現在你的代碼看起來像
fragmentTransaction.add(R.id.clean_preview_fragment_container,cleanPreviewFragment);
fragmentTransaction.commit();
fragmentTransaction.detach(cleanPreviewFragment);
fragmentTransaction.replace(R.id.clean_preview_fragment_container, processedPreviewFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
為什么要替換片段然后附加分離的片段?
我想你應該這樣做:
fragmentTransaction.add(R.id.clean_preview_fragment_container,cleanPreviewFragment);
fragmentTransaction.commit();
fragmentTransaction.detach(cleanPreviewFragment);
fragmentTransaction.replace(R.id.clean_preview_fragment_container, processedPreviewFragment);
fragmentTransaction.commit();
Detach(): Detach the given fragment from the UI.
但我認為關鍵是你剛剛添加了cleanPreviewFragment
並且還沒有提交,所以cleanPreviewFragment
還沒有在UI層次結構中,所以detach
和attach
將什么都不做。
也許這會奏效:
// first, add cleanPreviewFragment to UI
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.clean_preview_fragment_container,cleanPreviewFragment);
fragmentTransaction.commit();
// then create new transition and do your job
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.detach(cleanPreviewFragment);
fragmentTransaction.replace(R.id.clean_preview_fragment_container, processedPreviewFragment);
fragmentTransaction.attach(cleanPreviewFragment);
fragmentTransaction.commit();
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