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My project has a NullPointerException when creating the main activity. The main activity creates a fragment, which is where the exception lies. Here's the code for the part where it breaks: Fragment code:

Drawable red;

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    getActivity().setContentView(R.layout.main_layout);

    red = ((ImageView)this.getActivity().findViewById(R.drawable.icon_0)).getDrawable();
}

Activity code:

private ProblemFragment problemFrag;

protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);   
    problemFrag = new ProblemFragment();

    ActionBar bar = getSupportActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    Tab tab = bar.newTab().setText("Problem Fragment").setTabListener(new MyTabListener(this, dashboardFrag));

    bar.setHomeButtonEnabled(true);
}

It crashes when it's running past the red drawable. Is this because of the "getActivity()" line? It is imperative to have these values instantiated immediately, but I can't think of a way to load them up without using findById. If it helps, they are PNG files in the res folder.

4

2 に答える 2

2

これを試して：

Drawable red = getResources().getDrawable(R.drawable.icon_0);

xml で宣言されたビューではないすべてのリソースについて

于 2013-07-30T17:00:55.717 に答える
1

そのような状況での最善の解決策は、そのgetResources().getDrawable()ような方法を使用することです:

red = getActivity().getResources().getDrawable(R.drawable.icon_0);

resフォルダ内のすべてのドローアブルなどに使用してください。

于 2013-07-30T17:03:59.110 に答える