Android Checkable LinearLayout状态 [英] Android Checkable LinearLayout states
本文介绍了Android Checkable LinearLayout状态的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试实现可检查的线性布局，我已经完成了选中的项目，但是现在onclick和onLongClick不能正常工作了，它应该知道如何实现此行为.
I'am trying to implement a checkable Linear Layout, i already accomplish the checked item, but now the onclick and the onLongClick its not working has it should any ideas how can i implement this behavior.
- 如果未选中&& OnLongClick =检查
- 如果已选中&& onClick =取消选中
- 如果已选中&& onLongClick =取消选中
- 如果未选中&& onClick = super.performClick()
我可检查的LinearLayout
My checkable LinearLayout
public class CheckableLinearLayout extends LinearLayout implements Checkable {
/**
* Interface definition for a callback to be invoked when the checked state
* of this View is changed.
*/
public static interface OnCheckedChangeListener {
/**
* Called when the checked state of a compound button has changed.
*
* @param checkableView
* The view whose state has changed.
* @param isChecked
* The new checked state of checkableView.
*/
void onCheckedChanged(View checkableView, boolean isChecked);
}
private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };
private boolean mChecked = false;
private OnCheckedChangeListener mOnCheckedChangeListener;
public CheckableLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public boolean isChecked() {
return mChecked;
}
public void setChecked(boolean b) {
if (b != mChecked) {
mChecked = b;
refreshDrawableState();
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
}
}
}
public void toggle() {
setChecked(!mChecked);
}
@Override
public int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
/**
* Register a callback to be invoked when the checked state of this view
* changes.
*
* @param listener
* the callback to call on checked state change
*/
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
@Override
public boolean performLongClick() {
toggle();
return super.performLongClick();
}
@Override
public boolean performClick() {
if (isChecked()) {
toggle();
return false;
} else
return super.performClick();
}
我的状态可绘制xml
my state drawable xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/add_schedule_button_checked_pressed" android:state_checked="true" android:state_pressed="true"/>
<!-- <item android:drawable="@drawable/add_schedule_button_checked_focused" -->
<!-- android:state_checked="true" -->
<!-- android:state_focused="true" /> -->
<item android:drawable="@drawable/selected_card_shape_w_shadow_white" android:state_checked="true"/>
<!-- <item android:drawable="@drawable/add_schedule_button_unchecked_pressed" -->
<!-- android:state_pressed="true" /> -->
<!-- <item android:drawable="@drawable/add_schedule_button_unchecked_focused" -->
<!-- android:state_focused="true" /> -->
我的布局
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/topics_preview_main_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/favorites_header_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:layout_marginTop="2dp"
android:orientation="vertical" >
<TextView
android:id="@+id/favorites_header_title"
style="@style/CardText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:layout_marginTop="4dp"
android:background="@drawable/card"
android:gravity="left"
android:paddingBottom="10dp"
android:paddingLeft="5dp"
android:paddingTop="10dp"
android:text="@string/favorites_header" />
<ui.CheckableLinearLayout
android:id="@+id/favorites_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
android:layout_marginTop="4dp"
android:background="@drawable/selector_card_shape_w_shadow_white"
android:clickable="true"
android:longClickable="true"
android:orientation="vertical"
android:paddingBottom="16dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingLeft="8dp"
android:paddingRight="8dp" >
<TextView
android:id="@+id/favorites_title"
style="@style/CardTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="title" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="4dp"
android:background="@color/C_Favorites_Pink" />
<LinearLayout
android:id="@+id/favorites_description_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical"
android:padding="4dp" >
<TextView
android:id="@+id/favorites_description"
style="@style/CardText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:ellipsize="end"
android:maxLines="4"
android:text="Lorem ipsum dolor sit amet" />
</LinearLayout>
</ui.CheckableLinearLayout>
</LinearLayout>
我的片段
private void onFavoriteClick(final MCourse courseInfo,
LinearLayout favoritesLayout) {
favoritesLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String courseId = Integer.toString(v.getId());
String courseName = courseInfo.getFullname();
Bundle bundle = new Bundle();
bundle.putString("courseId", courseId);
bundle.putString("courseName", courseName);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
TopicsPreview insideTopicsFrag = new TopicsPreview();
insideTopicsFrag.setArguments(bundle);
fragmentTransaction
.replace(R.id.mainFragment, insideTopicsFrag);
fragmentTransaction.commit();
}
});
}
推荐答案
为了修复您当前的代码，我在这里发布了一个完整的代码解决方案(因为我不明白您的问题是什么).它非常相似，只是没有所需的额外逻辑.
in order to fix your current code, i've published here a whole code solution (since i didn't understand what's wrong with yours). it's quite similar, only it doesn't have the extra logic that you wanted.
或者，您可以改用下一个解决方案:
alternatively, you can use the next solution instead:
您可以在CTOR上调用setOnClickListener和setOnLongClickListener，并根据当前状态将逻辑包含在新函数中，例如:
you can call setOnClickListener and setOnLongClickListener on the CTOR , and have the logic in the new functions according to the current state, as such:
public CheckableLinearLayout(Context context, AttributeSet attrs)
{
super(context, attrs);
setOnClickListener(null);
}
为了使外部世界"使用这些新方法，您需要将它们作为包装器，例如:
in order to make the "outside world" work with these new methods, you need to make them as wrappers, for example:
public void setOnClickListener(... listener)
{
super.setOnClickListener(new ...
{
@Override
public void onClick(...)
{
// TODO add add logic that you wanted according to the state of the view
if(listener!=null)
listener.onClick(...);
}
});
}
应该为长按实现类似的东西.
similar thing should be implemented for the long-clicking.
顺便说一句，您忘了添加对savedState捆绑包的处理.在 此处 中查找缺少的内容.
btw, you've forgot to add handling of the savedState bundle. read here for the missing things .
这是我经过测试可与布局的可检查性"一起使用的代码:
here's my code that i've tested to work with the "checkability" of the layout:
public class CheckableLinearLayout extends LinearLayout implements Checkable
{
private boolean mChecked;
private static final String TAG =CheckableLinearLayout.class.getCanonicalName();
private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
public CheckableLinearLayout(final Context context)
{
super(context);
setClickable(true);
setLongClickable(true);
}
public CheckableLinearLayout(final Context context,final AttributeSet attrs)
{
super(context,attrs);
setClickable(true);
setLongClickable(true);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public CheckableLinearLayout(final Context context,final AttributeSet attrs,final int defStyle)
{
super(context,attrs,defStyle);
setClickable(true);
setLongClickable(true);
}
@Override
public void setChecked(final boolean checked)
{
mChecked=checked;
refreshDrawableState();
}
@Override
protected int[] onCreateDrawableState(final int extraSpace)
{
final int[] drawableState=super.onCreateDrawableState(extraSpace+1);
if(isChecked())
mergeDrawableStates(drawableState,CHECKED_STATE_SET);
return drawableState;
}
@Override
protected void drawableStateChanged()
{
super.drawableStateChanged();
final Drawable drawable=getBackground();
if(drawable!=null)
{
final int[] myDrawableState=getDrawableState();
drawable.setState(myDrawableState);
invalidate();
}
}
@Override
public boolean performClick()
{
Toast.makeText(getContext(),"click",Toast.LENGTH_SHORT).show();
return super.performClick();
}
@Override
public boolean performLongClick()
{
Toast.makeText(getContext(),"long click",Toast.LENGTH_SHORT).show();
return super.performLongClick();
}
@Override
public boolean isChecked()
{
return mChecked;
}
@Override
public void toggle()
{
setChecked(!mChecked);
}
@Override
public Parcelable onSaveInstanceState()
{
// Force our ancestor class to save its state
final Parcelable superState=super.onSaveInstanceState();
final SavedState savedState=new SavedState(superState);
savedState.checked=isChecked();
return savedState;
}
@Override
public void onRestoreInstanceState(final Parcelable state)
{
final SavedState savedState=(SavedState)state;
super.onRestoreInstanceState(savedState.getSuperState());
setChecked(savedState.checked);
requestLayout();
}
// /////////////
// SavedState //
// /////////////
private static class SavedState extends BaseSavedState
{
boolean checked;
@SuppressWarnings("unused")
public static final Parcelable.Creator<SavedState> CREATOR;
static
{
CREATOR=new Parcelable.Creator<SavedState>()
{
@Override
public SavedState createFromParcel(final Parcel in)
{
return new SavedState(in);
}
@Override
public SavedState[] newArray(final int size)
{
return new SavedState[size];
}
};
}
SavedState(final Parcelable superState)
{
super(superState);
}
private SavedState(final Parcel in)
{
super(in);
checked=(Boolean)in.readValue(null);
}
@Override
public void writeToParcel(final Parcel out,final int flags)
{
super.writeToParcel(out,flags);
out.writeValue(checked);
}
@Override
public String toString()
{
return TAG+".SavedState{"+Integer.toHexString(System.identityHashCode(this))+" checked="+checked+"}";
}
}
}
这篇关于Android Checkable LinearLayout状态的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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