Android Studio 2.0预览版
你好,
我有这个选择器连接到imageview.我想要imageview打开和关闭.因此off将显示绿色,并且将显示红色.
但是,当我点击时imageview没有任何反应.我尝试过state_pressed和state_checked的不同组合.而现在它变得太混乱了.我在这里想念的是什么
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="false"
android:drawable="@drawable/bottom_left_border"/>
<item android:state_checked="true"
android:drawable="@drawable/bottom_left_border_pressed">
</item>
</selector>
非常感谢任何建议,
Igo*_*nov 14
但是,当我点击imageview时没有任何反应.
因此,正如@Zielony所说,原因很简单:ImageView不支持检查状态.
从扩展的每个类View支持不同的状态:按下,选择,聚焦,可检查(注意未检查状态)等.但是检查是特殊状态.而只有少数View的支持它:ToggleButton,Switch,RadioButton,CheckBox,CheckedTextView.他们实现了Checkable界面.
你有变种如何解决你的情况,但它取决于你究竟需要什么:
如果你真的想要这个简单的事情
因此off将显示绿色,并且将显示红色.
你可以使用CheckBox或CheckedTextView举例.只需创建选择器:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="<red_color>" android:state_checked="true" />
<item android:drawable="<green_color>" />
</selector>
并使用它
<CheckBox
android:layout_width="50dp"
android:layout_height="50dp"
android:text=""
android:button="@null"
android:clickable="true"
android:background="<your_selector>"/>
使用其他状态.您可以使用state_activated(或者state_selected,请注意,因为选择的是瞬态属性)
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="<red_color>" android:state_activated="true" />
<item android:drawable="<green_color>" />
</selector>
并通过代码切换此状态
<your_image_view>.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
<your_image_view>.setActivated(!<your_image_view>.isActivated());
}
});
写你自己的可检查课程.你可以从其他人那里看到如何做到这一点:
public class CheckableImageView extends ImageView implements Checkable {
private boolean mChecked;
private static final int[] CHECKED_STATE_SET = {
android.R.attr.state_checked
};
public CheckableImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
public void toggle() {
setChecked(!mChecked);
}
public boolean isChecked() {
return mChecked;
}
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
}
}
}
与类OnCheckedChangeListener一样实现和保存状态,CheckBox这也是我见过的最好的实现
public class CheckableImageView extends ImageView implements Checkable {
private static final int[] checkedStateSet = { android.R.attr.state_checked };
private boolean mChecked = false;
private OnCheckedChangeListener mOnCheckedChangeListener;
private boolean mBroadcasting;
public CheckableImageView(Context context) {
super(context);
}
public CheckableImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CheckableImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public boolean performClick() {
toggle();
return super.performClick();
}
@Override
public void toggle() {
setChecked(!mChecked);
}
@Override
public int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, checkedStateSet);
}
return drawableState;
}
@Override
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
// Avoid infinite recursions if setChecked() is called from a listener
if (mBroadcasting) {
return;
}
mBroadcasting = true;
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
}
mBroadcasting = false;
}
}
/**
* Register a callback to be invoked when the checked state of this button
* changes.
*
* @param listener the callback to call on checked state change
*/
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
/**
* Interface definition for a callback to be invoked when the checked state
* of a compound button changed.
*/
public static interface OnCheckedChangeListener {
/**
* Called when the checked state of a compound button has changed.
*
* @param buttonView The compound button view whose state has changed.
* @param isChecked The new checked state of buttonView.
*/
void onCheckedChanged(CheckableImageView buttonView, boolean isChecked);
}
static class SavedState extends BaseSavedState {
boolean checked;
/**
* Constructor called from {@link CompoundButton#onSaveInstanceState()}
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Constructor called from {@link #CREATOR}
*/
private SavedState(Parcel in) {
super(in);
checked = (Boolean) in.readValue(null);
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeValue(checked);
}
@Override
public String toString() {
return "CheckableImageView.SavedState{" + Integer.toHexString(System.identityHashCode(this)) + " checked=" + checked + "}";
}
public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.checked = isChecked();
return ss;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
setChecked(ss.checked);
requestLayout();
}
}
首先想到这个选项,并有一个很好的实现.但你也可以提出你自己的版本,或者使用简单的变量来保存状态和切换,如@ Chirag-Savsani所说,但在这种情况下你将不得不放弃使用selectors.
原因很简单 - ImageView根本不检查state_checked.@ frank-n-stein的评论最接近这个问题的答案.
您有两种选择:
要添加state_checked支持,您必须实现Checkable接口.像这样:
public class CheckableImageView extends ImageView implements Checkable {
private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
private boolean mChecked;
... constructors
@Override
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
}
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public void toggle() {
setChecked(!mChecked);
}
@Override
public boolean performClick() {
toggle();
return super.performClick();
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
@Override
protected Parcelable onSaveInstanceState() {
SavedState result = new SavedState(super.onSaveInstanceState());
result.checked = mChecked;
return result;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (!(state instanceof SavedState)) {
super.onRestoreInstanceState(state);
return;
}
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
setChecked(ss.checked);
}
protected static class SavedState extends BaseSavedState {
protected boolean checked;
protected SavedState(Parcelable superState) {
super(superState);
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(checked ? 1 : 0);
}
public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
private SavedState(Parcel in) {
super(in);
checked = in.readInt() == 1;
}
}
}
代码来自:https://github.com/shomeser/AndroidLayoutSelector/blob/master/LayoutSelector/src/main/java/com/example/layoutselector/CheckableLinearLayout.java
您好我也在我当前的应用程序中使用此场景.
1)使用CheckBox
CheckBox与android:button="@null"属性一起使用,此属性将删除边框CheckBox并仅显示您的可绘制图像.
state_checked 财产将与合作 CheckBox
<CheckBox
android:id="@+id/imgDisplayCheckimg"
android:layout_width="wrap_contenrt"
android:layout_height="wrap_contenrt"
android:background="@drawable/display_checkbox"
android:button="@null"
android:checked="false"
android:clickable="true" />
这是Drawable文件 display_checkbox.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- When selected, use red-->
<item android:drawable="@drawable/red_color" android:state_checked="true"/>
<!-- When not selected, use green-->
<item android:drawable="@drawable/green_color" android:state_checked="false"/>
</selector>
将red_color和green_color替换为可绘制的名称.
2)使用 ImageView
在全球范围内声明此变量
boolean switchStatus = false;
找到你的ImageView并在下面添加Click Listener.
switchImageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(switchStatus == true) {
anonymousImage.setImageResource(R.drawable.red);
switchStatus = false;
} else {
anonymousImage.setImageResource(R.drawable.green);
switchStatus = true;
}
}
});
ImageView 在布局文件中.
<ImageView
android:id="@+id/switchImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/green" />
使用可绘制的名称更改绿色和红色的名称.
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