Question

我的listview顶部有按钮。在从列表中选择项目之前，按钮不起作用。根据其他一些帖子，我应该在我的XML文件中添加以下行：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>

以下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();      
    }
}

}

对于有同样问题的人，我将以下代码添加到我的活动中，现在我的按钮具有焦点：

    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();
}

}

Answer 1

这些按钮不适用于任何内容，而不仅仅是ListView。

要获得点击（我假设这是您想要的），请让您的Activity实现View.OnClickListener并在onClick方法中实现您的点击处理逻辑（更多详细信息请https://developer.android.com/guide/topics/ui/ui-events.html），并在onCreate，执行此操作：

Button b = (Button) findViewById(R.id.concert);
b.setOnClickListener(this);

Answer 2

您的Button已在onListItemClick内实例化，因此在您点击列表项之前它们不会是clickcable。您可以将它们移至onCreate()，但之后您还需要inflate其他View，使用setContentView()

此外，正如buptcoder的评论中所述，我看不到OnClickListener附加了Button。我仍然看不到它是可点击的，直到你将它移出听众现在，但OnClickListener仍然需要附加到Button

按钮不与listview一起使用

2 个答案: