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所以我刚刚开始做一些android编程，我已经卡住了！我的问题是；我希望我的来自 MainActivity 的片段不成为我的新 Activity 的一部分。我希望活动全部为空白， MainActivity 的片段应该消失，但事实并非如此。

来自“fragmentz”xml 文档的内容，该文档在 Fragment 类中“链接”。不应该出现在第二个 Activity 中......在 SecondActivity 中我将它与 Fragment 类相关联的位置？这越来越令人沮丧：D

所以这是我的 MainActivity 代码：

public class MainActivity extends ActionBarActivity {


FragmentManager manager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    manager= getSupportFragmentManager();

    ArticleFragment frag = new ArticleFragment();
    FragmentTransaction transaction = manager.beginTransaction();
    transaction = manager.beginTransaction();
    transaction.add(R.id.fragmentet,frag,"tagg");
    transaction.commit();

    // here the Fragment should be added to my MainActiviy
}




public void WalkForward(View view)
{


    ArticleFragment frag = (ArticleFragment) manager.findFragmentByTag("tagg");
    FragmentTransaction transaction = manager.beginTransaction();

    transaction.remove(frag);
    transaction.commit(); 
    // Here, the fragment should disappear before the new activity start


    Intent intenten = new Intent(this, SecondActivity.class);
    startActivity(intenten);
    // Start new activity


    finish();
    // I've tried this finish method, and also onDestroy and so on... But that work either. I thought the Fragments should 
    // disappear with its activity?

}






@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

}

我的片段类：

public class ArticleFragment extends Fragment {

public void onAttach(Activity activity)
{
    Log.d("Fraggment", "onAttach");
    super.onAttach(activity);
    // #17 Android FragmentTransaction Part 2: Android Application Development Development [HD 1080p]
}

public void onCreate(Bundle saveInstanceState)
{
    Log.d("Fraggment", "onCreate");
    super.onCreate(saveInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragmentz, container, false);
}


public void onActivityCreate(Bundle saveInstanceState)
{
    Log.d("Fraggment", "onActivityCreated");
    super.onActivityCreated(saveInstanceState);

}

public void onPause()
{
    super.onPause();
    Log.d("Fraggment", "onPause");

}

public void onStop()
{
    super.onStop();
    Log.d("Fraggment", "onStop");


}

public void onDestroyView()
{
    super.onDestroyView();
    Log.d("Fraggment", "onDestroyView");


}

public void onDestroy()
{
    super.onDestroy();
    Log.d("Fraggment", "onDestroy");


}


public void onDetach()
{
    super.onDetach();
    Log.d("Fraggment", "onDetach");


}

我的第二个活动课：

public class SecondActivity extends MainActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.second, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_second,
                container, false);
        return rootView;
    }
}

}

我希望你明白我的意思：P 有什么我能做的吗？提前致谢！

4

1 回答 1

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删除这个

if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

从你的第二个活动。为什么要扩展 MainActivity？一些理由？

于 2014-08-09T19:36:51.473 回答