我想从这个 mainActivity 动态添加一个视图到片段。
因为， Fragment 类没有addView()API，我还有其他可用的选项。
我在第 1 行尝试过fragment.getView()，但它给出了空指针异常。我不太了解 Fragment api，也没有时间去投资。任何人都可以请提供解决该问题的方法。
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tabA = bar.newTab().setText("A Tab");
ActionBar.Tab tabB = bar.newTab().setText("B Tab");
ActionBar.Tab tabC = bar.newTab().setText("C Tab");
Fragment fragmentA = new AFragmentTab();
Fragment fragmentB = new BFragmentTab();
Fragment fragmentC = new CFragmentTab();
tabA.setTabListener(new MyTabsListener(fragmentA));
tabB.setTabListener(new MyTabsListener(fragmentB));
tabC.setTabListener(new MyTabsListener(fragmentC));
bar.addTab(tabA);
bar.addTab(tabB);
bar.addTab(tabC);
//Line 1
//How to add a view from here to any of these fragment
//Or how can i modify the content of that fragment
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
protected class MyTabsListener implements ActionBar.TabListener {
private Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.add(R.id.fragment_container, fragment, null);
// Or should the modification/addition of views be done here.
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// some people needed this line as well to make it work:
ft.remove(fragment);
}
}
}
BFagmentTab.java
public class BFragmentTab extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_b, container, false);
}
}