java - Android Spinner 不适用于搭载 Android 5.0 的三星设备

Question

我正在使用带有以下代码的自定义 Spinner 小部件。 除了三星的 Android 5.0 设备外，大多数设备上一切正常。单击时，微调器应显示值列表，但事实并非如此。

在搭载 Android 5.0 的模拟器和其他品牌设备上运行良好。

有没有人遇到过类似的问题或知道可能会发生什么？

xml

<?xml version="1.0" encoding="utf-8"?>

<Spinner
    android:id="@+id/_combo_spinner"
    android:layout_width="0px"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:focusable="false"
    android:background="@null"
    android:clickable="false"
    android:paddingBottom="@dimen/cell_text_section_text_padding_bottom"
    android:paddingLeft="@dimen/cell_text_section_text_padding_left"
    android:paddingRight="@dimen/cell_text_section_text_padding_right"
    android:paddingTop="@dimen/cell_text_section_text_padding_top"
    android:spinnerMode="dropdown" />

<View
    android:layout_width="@dimen/drawable_stroke_width"
    android:layout_height="match_parent"
    android:layout_marginBottom="5dp"
    android:layout_marginTop="3dp"
    android:background="@color/stroke_dark_grey"
    android:paddingBottom="@dimen/cell_text_section_text_padding_bottom"
    android:paddingTop="@dimen/cell_text_section_text_padding_top" />

<ImageView
    style="@style/image__default"
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:layout_gravity="center"
    android:layout_marginLeft="@dimen/cell_text_section_text_padding_left"
    android:layout_marginRight="@dimen/cell_text_section_text_padding_right"
    android:src="@drawable/ic_action_expand" />

Java

public class ComboBoxView extends LinearLayout {

private Spinner mSpinner;
private OnItemSelectedListener mListener;

public ComboBoxView(Context context) {
    super(context);
    initializeLayout(context);
}

public ComboBoxView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initializeLayout(context);
}

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public ComboBoxView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initializeLayout(context);
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public ComboBoxView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    initializeLayout(context);
}

// Internal methods:

/**
 * Initializes the layout
 *
 * @param context
 */
private void initializeLayout(final Context context) {

    mListener = null;

    // Inflate and retrieve the views:
    this.setOrientation(LinearLayout.VERTICAL);
    LayoutInflater.from(context).inflate(R.layout.view_combo_box, this);
    mSpinner = (Spinner) findViewById(R.id._combo_spinner);

    // Finish initialization:
    final int paddingTop = (int) getResources().getDimension(R.dimen.cell_text_section_text_padding_top);
    final int paddingBottom = (int) getResources().getDimension(R.dimen.cell_text_section_text_padding_bottom);
    final int paddingLeft = (int) getResources().getDimension(R.dimen.cell_text_section_text_padding_left);
    final int paddingRight = (int) getResources().getDimension(R.dimen.cell_text_section_text_padding_right);
    setOnClickListener(onClick);
    setOrientation(LinearLayout.HORIZONTAL);
    setBackgroundResource(R.drawable.button_primary);
    setClickable(true);
    setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    return true;
}

private final OnClickListener onClick = new OnClickListener() {

    @Override
    public void onClick(View v) {
        mSpinner.performClick();
    }
};

@Override
public void clearFocus() {
    super.clearFocus();
    mSpinner.clearFocus();
}

// External methods:

/**
 * Interface definition for a callback to be invoked when
 * an item in this view has been selected (extracted from {@link AdapterView.OnItemSelectedListener}).
 */
public interface OnItemSelectedListener {

    /**
     * <p>Callback method to be invoked when an item in this view has been
     * selected. This callback is invoked only when the newly selected
     * position is different from the previously selected position or if
     * there was no selected item.</p>
     * <p/>
     * Impelmenters can call getItemAtPosition(position) if they need to access the
     * data associated with the selected item.
     *
     * @param parent   The ComboBoxView where the selection happened
     * @param position The position of the view in the adapter
     * @param id       The row id of the item that is selected
     */
    void onItemSelected(ComboBoxView parent, int position, long id);

    /**
     * Callback method to be invoked when the selection disappears from this
     * view. The selection can disappear for instance when touch is activated
     * or when the adapter becomes empty.
     *
     * @param parent The ComboBoxView that now contains no selected item.
     */
    void onNothingSelected(ComboBoxView parent);
}

public void setValuesAsString(final List<String> newValues) {
    setValuesAsString(newValues, 0);
}

public void setValuesAsString(final List<String> newValues, int initialValue) {

    List<CharSequence> result = new ArrayList<CharSequence>(newValues.size());
    for(String value : newValues) {
        result.add(value);
    }
    setValues(result, initialValue);
}

public void setValues(final List<CharSequence> newValues) {
    setValues(newValues, 0);
}

public void setValues(final List<CharSequence> newValues, int initialValue) {

    if((initialValue >= newValues.size()) || (initialValue < -1)) {
        IllegalArgumentException ex = new IllegalArgumentException("Invalid value for initialValue");
        LOG.error(LOG.SOURCE.UI, "Invalid",ex);
        throw ex;
    }

    // Prepare the list of elements:
    // NOTE: The last item in ComboBoxArrayAdapter must be empty. Items should also contain the
    // same number of lines as the "tallest" entry:
    final List<CharSequence> finalValues = new ArrayList<CharSequence>(newValues.size());
    finalValues.addAll(newValues);

    int maxLines = 1;
    for(CharSequence text : newValues) {
        final String[] lines = text.toString().split("\r\n|\r|\n");
        maxLines = Math.max(maxLines, lines.length);
    }
    finalValues.add("");

    // Prepare spinner:
    final ComboBoxArrayAdapter adapter = new ComboBoxArrayAdapter(this.getContext(), R.layout.view_combo_box_item, finalValues);
    adapter.setDropDownViewResource(R.layout.view_combo_box_item_dropdown);
    adapter.setMaxLines(maxLines);
    mSpinner.setOnItemSelectedListener(null);
    mSpinner.setAdapter(adapter);
    mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        boolean firstSelection = true;

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            if (mListener != null) {
                int index = (position >= (mSpinner.getCount() - 1)) ? -1 : position;
                mListener.onItemSelected(ComboBoxView.this, index, id);
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            if (mListener != null) {
                mListener.onNothingSelected(ComboBoxView.this);
            }
        }
    });

    if (mListener != null) {
        mListener.onNothingSelected(this);
    }

    // Set initial selection:
    if(initialValue != -1) {
        mSpinner.setSelection(initialValue);
    } else {
        mSpinner.setSelection(newValues.size());
    }
}


public void setOnItemSelectedListener(final OnItemSelectedListener listener) {
    mListener = listener;
}


public int getSelectedItem() {
    int result = mSpinner.getSelectedItemPosition();
    if(result >= mSpinner.getCount()) {
        result = -1;
    }

    return result;
}

旋转器

示例结果

提前致谢。

Answer 1

我终于解决了这个问题!

android 属性 clickable 被设置为 false，但点击行为是在 ComboBoxView.java 文件中的以下代码中执行的:

private final OnClickListener onClick = new OnClickListener() {

    @Override
    public void onClick(View v) {
         mSpinner.performClick();
    }
};

除搭载 Android 5.0 的三星设备外，这在任何地方(设备和模拟器)都有效。这我不明白为什么。

在我将 cliclabke 属性更改为 true 后，它开始工作了。

android:clickable="true"

谢谢。