无法为Android应用程序中的片段正确扩充布局

时间:2014-07-03 15:12:10

标签: android textview fragment layout-inflater

首先,这是片段的代码:

public class MyFragment extends Fragment {
    private View FragmentView;

    public static Fragment newInstance() {
        MyFragment NewFragment = new MyFragment();
        return NewFragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        FragmentView = inflater.inflate(
            R.layout.tasks, 
            new LinearLayout(MainActivity.MainContext)
        );
        FragmentView.setLayoutParams(
            new LayoutParams(
                LayoutParams.MATCH_PARENT, 
                LayoutParams.MATCH_PARENT
            )
        );
        addText();

        return FragmentView;
    }

    private void addText() {
        TasksView.setBackgroundResource(R.drawable.bg_image);
        TextView MyTitle = new TextView(MainActivity.MainContext);
        MyTitle.setLayoutParams(
            new LayoutParams(
                LayoutParams.MATCH_PARENT, 
                LayoutParams.WRAP_CONTENT
            )
        );

        MyTitle.setText(R.string.mytitle);
        ((LinearLayout) FragmentView).addView(MyTitle );
    }
}

MainActivity.MainContext在主要活动的课程中存储为public static,并在getApplicationContext()创建活动时检索。

现在,问题出现在这里:

 FragmentView = inflater.inflate(
     R.layout.tasks, 
     new LinearLayout(MainActivity.MainContext)
 );

因此,片段内不会显示MyTitle文本视图。如果我这样做:

FragmentView = inflater.inflate(R.layout.tasks, null);

显示但我收到警告:

Avoid passing null as the view root (needed to resolve layout parameters on the inflated layout's root element)

我想要正确地做,没有得到任何警告,我找不到办法。我也尝试过:

FragmentView = inflater.inflate(R.layout.tasks, container);

但是应用程序崩溃了。

1 个答案:

答案 0 :(得分:6)

您应该将container作为父母传递。

FragmentView = inflater.inflate(
            R.layout.tasks, 
            container,
            false
        );

此外,您应指定false,因此LayoutInflater不会将夸大的视图附加到父级。膨胀的视图通过FragmentManager附加到父级。