Question

我在android中的字符串数组有点麻烦。 onClick工作正常，但它不显示新活动中单击项目的标题。当我说标题时，我的意思是在工具栏中。

<string-array name="states">
    <item>Alabama</item>
    <item>Alaska</item>
    <item>Arizona</item>
    <item>California</item>
    <item>Colorado</item>
    <item>Connecticut</item>
</string-array>

这是我在

中的片段的代码

public class FragmentState extends Fragment {

    private ListView catagoryList;
    private View root;
    private TreeAdapter adapter;

    public FragmentState() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        root = inflater.inflate(R.layout.fragment_scholar, container, false);

        catagoryList = (ListView) root.findViewById(R.id.list);
        adapter = new TreeAdapter(getActivity(), R.layout.item_catagory, getResources().getStringArray(R.array.categories));


        catagoryList.setAdapter(adapter);

        catagoryList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(FragmentState.this.getActivity(), StateView.class);
                startActivity(intent);
            }
        });

        return root;

    }

}

在我的活动中

public class StateView extends AppCompatActivity {

    RecyclerView reship;
    BulletinAdapter ship;

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

        Toolbar toolbar = (Toolbar) findViewById(R.id.ptoolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        listTitle();
    }

    private void listTitle() {
        String[] list = getResources().getStringArray(R.array.categories);
        int p = 0;
        setTitle(list[p]);
    }
}

上述方法有效，但标题仅显示点击的第一个项目。我尝试使用Intents但它也不会显示标题。任何帮助将非常感激。

Answer 1

在您的代码中，您只使用第一个索引值：

  int p = 0;
  setTitle(list[p]);

Answer 2

您可以从FragmentState传递位置。

Intent intent = new Intent(FragmentState.this.getActivity(), StateView.class);
intent.putExtra("STATE_POSITION", position);
startActivity(intent);

并在State活动中检索并将其传递给listTitle()

public class StateView extends AppCompatActivity {

    RecyclerView reship;
    BulletinAdapter ship;

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

        Intent intent = getIntent();
        int statePosition = intent.getIntExtra("STATE_POSITION", 0); // Here 0 is default value in case `STATE_POSITION` was not sent via intent

        Toolbar toolbar = (Toolbar) findViewById(R.id.ptoolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        listTitle(statePosition);
    }

    private void listTitle(int statePosition) {
        String[] list = getResources().getStringArray(R.array.categories);
        setTitle(list[statePosition]);
    }
}

Answer 3

首先更改适配器的字符串资源数组名称

adapter = new TreeAdapter(getActivity(), R.layout.item_catagory, getResources().getStringArray(R.array.states));

因为你有数组名称作为状态而不是类别

在开始第二项活动之前，第二次通过捆绑中的点击位置

Intent intent = new Intent(FragmentState.this.getActivity(), StateView.class);
intent.putExtras("position",position);                
startActivity(intent);

第二个活动中的第三个读取此捆绑值并将其分配给变量

int selectedPosition=getIntent().getExtras().getInt("position",0);

修改列表标题方法

private void listTitle() {
        String[] list = getResources().getStringArray(R.array.states);

        setTitle(list[selectedPosition]);
    }

字符串数组onclick不显示标题

3 个答案: