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我的列表视图顶部有按钮。在我从列表中选择一个项目之前,这些按钮不起作用。根据其他一些帖子,我应该将以下行添加到我的 XML 文件中:android:focusable="false"。但是,添加该行后没有发生任何变化。

这是我的 XML 文件:

<LinearLayout 
    android:layout_weight="2" 
    android:layout_height="fill_parent" 
    android:layout_width="match_parent" 
    >
<VideoView 
    android:id="@+id/video_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    />
</LinearLayout> 

<LinearLayout 
    android:layout_weight="1" 
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent"
    android:orientation="vertical"  >  
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/chapters"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:focusable="false"
            android:text="@string/chapters" /> 

        <Button
            android:id="@+id/scales"
            android:layout_width="100dp"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:focusable="false"
            android:text="@string/scales" />

        <Button
            android:id="@+id/b_flat"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/b_flat" /> 

        <Button
            android:id="@+id/e_flat"
            android:layout_width="75dp"
            android:layout_height="@dimen/btn_layout_height"    
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/e_flat" /> 

        <Button
            android:id="@+id/concert"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/concert" />

        <Button
            android:id="@+id/bass"
            android:layout_width="75dp"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/bass" />  

        <Button
            android:id="@+id/video"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/btn_layout_height"
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/video" />

        <Button
            android:id="@+id/practice"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/btn_layout_height"    
            android:textSize="@dimen/text_size"
            android:background="@drawable/button_custom"
            android:text="@string/practice" />                                                      
    </LinearLayout>

<FrameLayout 
          android:id="@+id/fragmentContainer"
          android:layout_height="match_parent"
          android:layout_width="match_parent" 
          />
</LinearLayout>

这是我用来显示列表的代码:

public class ChapterListFragment extends ListFragment {
private static final boolean VERBOSE = true;
private ArrayList<Chapters> mChapters;
private static final String TAG = "ChapterListFragment";

private Button mChaptersButton;

@Override
public void onCreate(Bundle savedInstanceState) {
    if (VERBOSE) Log.v(TAG, "+++ onCreate +++");
    super.onCreate(savedInstanceState);             

    getActivity().setTitle(R.string.chapters_title);
    mChapters = ChapterList.get(getActivity()).getChapters();

    ChapterAdapter adapter = new ChapterAdapter(mChapters);
    setListAdapter(adapter);        

}

我将“onListItemClick”更新为以下内容:

    @Override
public void onListItemClick(ListView l, View v, int position, long id) {
     //if (VERBOSE) Log.v(TAG, "+++ onListItemClick +++");       

    // Get the chapter from the adapter
    Chapters c = ((ChapterAdapter)getListAdapter()).getItem(position);

    //Start ImprovisationActivity
    Intent i = new Intent(getActivity(), ImprovisationActivity.class);
    i.putExtra(ChapterFragment.EXTRA_CHAPTER_ID, c.getId());
    startActivity(i);
}

private class ChapterAdapter extends ArrayAdapter<Chapters> {

    public ChapterAdapter(ArrayList<Chapters> chapters) {
        super(getActivity(), 0, chapters);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // If we weren't given a view, inflate one
        if (convertView == null) {
            convertView = getActivity().getLayoutInflater()
                    .inflate(R.layout.list_item_chapter, null);
        }
        // Configure the view for this Chapter
        Chapters c = getItem(position);

        TextView titleTextView =
                (TextView) convertView.findViewById(R.id.chapter_list_item_titleTextView);
        titleTextView.setText(c.getChapter());

        return convertView;         
    }
}

@Override
public void onResume() {
    super.onResume(); {
    ((ChapterAdapter)getListAdapter()).notifyDataSetChanged();      
    }
}

}

对于任何有同样问题的人,我在我的活动中添加了以下代码,现在我的按钮有了焦点:

    public class ChapterListActivity extends SingleFragmentActivity {

private static final boolean VERBOSE = true;
private static final String TAG = "ChapterListActivity";

private Button mChaptersButton;

@Override
public void onCreate(Bundle savedInstanceState) {
    if (VERBOSE) Log.v(TAG, "+++ onCreate +++");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_improvisation);        

    mChaptersButton = (Button)findViewById(R.id.chapters);      

    // Need to default the button to pressed
    mChaptersButton.setSelected(true);
    mChaptersButton.setOnClickListener(new OnClickListener() {         
        @Override
        public void onClick(View v) {
            if (mChaptersButton.isSelected()){
                    if (VERBOSE) Log.v(TAG, "+++ onClick for mChaptersButton +++");
                    mChaptersButton.setSelected(false);
                Toast.makeText(getApplicationContext(), "Chapters Button Not Selected", 
                            Toast.LENGTH_SHORT).show();
                } else {
                Toast.makeText(getApplicationContext(), "Chapters Button Selected", 
                            Toast.LENGTH_SHORT).show();
                mChaptersButton.setSelected(true);
                }
        }
    });
}

@Override
protected Fragment createFragment() {
    if (VERBOSE) Log.v(TAG, "+++ createFragment +++");
    return new ChapterListFragment();
}

}

4

2 回答 2

1

这些按钮不能用于任何东西,而不仅仅是 ListView。

要获得点击(我假设这是你想要的)工作,让你的 Activity 实现 View.OnClickListener 并在 onClick 方法中实现你的点击处理逻辑(更多细节在这里https://developer.android.com/guide/topics /ui/ui-events.html ),然后在 onCreate 中执行以下操作:

Button b = (Button) findViewById(R.id.concert);
b.setOnClickListener(this);
于 2013-05-19T02:54:14.500 回答
0

Button在您的内部实例化, 因此在您单击列表项之前onListItemClick它们不会出现。clickcable您可以将它们移动到,onCreate()但随后您还需要在其中使用inflate另一个ViewsetContentView()

此外,正如 buptcoder 的评论中所述,我没有看到OnClickListener附加到Button. 我仍然看不到它是可点击的,直到你将它移出现在的监听器之后,但OnClickListener仍然需要附加到Button

于 2013-05-19T02:53:18.893 回答