我嘗試了android碎片,並且我無法理解這一點;請幫助添加和替換片段,在android中不能正常工作
public class MainActivity extends FragmentActivity {
private static final String TAG = "MyActivity";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (findViewById(R.id.fragment_container) !=null) {
if(savedInstanceState!=null){
return ;
}
ArticleFragment first_fragment = new ArticleFragment();
HeadlineFragment second_fragment = new HeadlineFragment();
first_fragment.setArguments(getIntent().getExtras());
second_fragment.setArguments(getIntent().getExtras());
FragmentTransaction manager=getSupportFragmentManager().beginTransaction();
manager.add(R.id.fragment_container, first_fragment,"first");
manager.add(R.id.yo, second_fragment,"second");
manager.commit();
}
}
現在我想刪除second_fragment在一個按鈕按下並替換爲另一個。所以我試過這個
if(getSupportFragmentManager().findFragmentByTag("second")!=null) {
Log.d(TAG,"found");
abc newFragment = new abc();
Bundle args = new Bundle();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.remove(getSupportFragmentManager().findFragmentByTag("second"));
transaction.add(R.id.fragment_container,newFragment,"third");
transaction.addToBackStack(null);
transaction.commit();
}
但是當我再次按下該按鈕時,條件通過。 這裏有什麼問題?
你有問題嗎?在第一種方法還是第二種? – 2015-04-04 12:55:41