Java 为什么我的自定义微调器被禁用/无响应?
我创建了一个自定义微调器,因为我一次又一次地发现,我希望确保在设置微调器的初始选择或设置新的自定义适配器时,不会触发Java 为什么我的自定义微调器被禁用/无响应?,java,android,android-spinner,android-custom-view,Java,Android,Android Spinner,Android Custom View,我创建了一个自定义微调器,因为我一次又一次地发现,我希望确保在设置微调器的初始选择或设置新的自定义适配器时,不会触发onItemSelectedListener。我只希望在用户实际选择项目时触发它 但由于某种原因(我完全不知道为什么),我的自定义微调器对触摸事件没有响应。这就好像它被禁用了一样,尽管我已经调试并看到它完全被启用了。但由于某种原因,我的小纺纱机打不开。有人能帮我理解为什么吗 以下是xml: <LinearLayout android:layout_width=
onItemSelectedListener
。我只希望在用户实际选择项目时触发它
但由于某种原因(我完全不知道为什么),我的自定义微调器对触摸事件没有响应。这就好像它被禁用了一样,尽管我已经调试并看到它完全被启用了。但由于某种原因,我的小纺纱机打不开。有人能帮我理解为什么吗
以下是xml:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginTop="@dimen/default_margin"
android:orientation="horizontal">
<my.app.custom.view.MySpinner
android:id="@+id/dog_or_cat_toggle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:layout_margin="0dp"
android:textAlignment="center"
android:gravity="center_vertical|center"
android:padding="0dp"
android:entries="@array/dog_or_cat"
android:spinnerMode="dropdown"
android:background="@drawable/top_to_bottom_gray_gradient"/>
...
</LinearLayout>
...
和我的自定义微调器:
/* A Spinner dispatches an onItemSelected event when the View is initialized, before the user ever makes a selection.
* This class allows listeners for just the initial selection, just user selections, or both. */
public class MySpinner extends Spinner {
private boolean initialized = false;
private OnItemSelectedListener onItemSelectionInitializedListener;
private OnItemSelectedListener onItemSelectedByUserListener;
private OnItemSelectedListener onItemSelectedListener;
public MySpinner(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public MySpinner(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public MySpinner(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
this.initializeMySpinner();
}
public void setOnItemSelectionInitializedListener(OnItemSelectedListener onItemSelectionInitializedListener) {
this.onItemSelectionInitializedListener = onItemSelectionInitializedListener;
}
public void setOnItemSelectedByUserListener(OnItemSelectedListener onItemSelectedByUserListener) {
this.onItemSelectedByUserListener = onItemSelectedByUserListener;
}
@Override
public void setOnItemSelectedListener(OnItemSelectedListener onItemSelectedListener) {
this.onItemSelectedListener = onItemSelectedListener;
}
@Override
public void setAdapter(SpinnerAdapter adapter) {
this.initialized = false;
super.setAdapter(adapter);
}
private void initializeMySpinner() {
super.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if(!initialized) {
if(onItemSelectionInitializedListener != null) onItemSelectionInitializedListener.onItemSelected(parent, view, position, id);
if(onItemSelectedListener != null) onItemSelectedListener.onItemSelected(parent, view, position, id);
initialized = true;
} else {
if(onItemSelectedListener != null) onItemSelectedListener.onItemSelected(parent, view, position, id);
if(onItemSelectedByUserListener != null) onItemSelectedByUserListener.onItemSelected(parent, view, position, id);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
if(!initialized) {
if(onItemSelectionInitializedListener != null) onItemSelectionInitializedListener.onNothingSelected(parent);
if(onItemSelectedListener != null) onItemSelectedListener.onNothingSelected(parent);
initialized = true;
} else {
if(onItemSelectedListener != null) onItemSelectedListener.onNothingSelected(parent);
if(onItemSelectedByUserListener != null) onItemSelectedByUserListener.onNothingSelected(parent);
}
}
});
}
}
/*在用户进行选择之前,当视图初始化时,微调器会发送一个onItemSelected事件。
*此类仅允许侦听器进行初始选择、用户选择或两者*/
公共类MySpinner扩展微调器{
私有布尔初始化=false;
私有OnItemSelectedListener onItemSelectionInitializedListener;
私有OnItemSelectedListener onItemSelectedByUserListener;
专用OnItemSelectedListener OnItemSelectedListener;
公共MySpinner(上下文、属性集属性){
这(上下文,属性,0);
}
公共MySpinner(上下文上下文、属性集属性、int defStyleAttr){
这(context,attrs,defStyleAttr,0);
}
公共MySpinner(上下文上下文、属性集attrs、int-defStyleAttr、int-defStyleRes){
super(context、attrs、defStyleAttr、defStyleRes);
this.initializeMySpinner();
}
public void setOnItemSelectionInitializedListener(OnItemSelectedListener onItemSelectionInitializedListener){
this.onItemSelectionInitializedListener=onItemSelectionInitializedListener;
}
public void setOnItemSelectedByUserListener(OnItemSelectedListener onItemSelectedByUserListener){
this.onItemSelectedByUserListener=onItemSelectedByUserListener;
}
@凌驾
公共无效setOnItemSelectedListener(OnItemSelectedListener OnItemSelectedListener){
this.onItemSelectedListener=onItemSelectedListener;
}
@凌驾
公用void setAdapter(SpinnerAdapter适配器){
this.initialized=false;
super.setAdapter(适配器);
}
private void initializeMySpinner(){
super.setOnItemSelectedListener(新的OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
如果(!已初始化){
如果(onItemSelectionInitializedListener!=null)onItemSelectionInitializedListener.onItemSelected(父项、视图、位置、id);
如果(onItemSelectedListener!=null)onItemSelectedListener.onItemSelected(父项、视图、位置、id);
初始化=真;
}否则{
如果(onItemSelectedListener!=null)onItemSelectedListener.onItemSelected(父项、视图、位置、id);
如果(onItemSelectedByUserListener!=null)onItemSelectedByUserListener.onItemSelected(父、视图、位置、id);
}
}
@凌驾
未选择公共无效(AdapterView父级){
如果(!已初始化){
如果(onItemSelectionInitializedListener!=null)onItemSelectionInitializedListener.onNothingSelected(父级);
如果(onItemSelectedListener!=null)onItemSelectedListener.onNothingSelected(父级);
初始化=真;
}否则{
如果(onItemSelectedListener!=null)onItemSelectedListener.onNothingSelected(父级);
如果(onItemSelectedByUserListener!=null)onItemSelectedByUserListener.onNothingSelected(父级);
}
}
});
}
}
不要从一个构造函数调用另一个构造函数。相反,从每个构造函数调用super()构造函数
我以前也遇到过同样的问题,这个技巧奏效了,但我不确定原因 查看您不需要任何自定义的
微调器类:查看上面的代码,但如果您确实需要它,则替换此(上下文,attrs,0)代码>和这个(上下文,attrs,android.R.attr.spinnerStyle)我爱你,鲍勃。如果您不知道为什么会发生这种情况,请替换this(context,attrs,0)代码>和这个(上下文,attrs,android.R.attr.spinnerStyle)代码>