今天用到了android的preferences组件,可是android定义的preferrence组件只有:CheckboxBoxPrefrence、EditTextPreference、ListPreference等几个组件,可是公司要求我在preferences中用RadioButton,没办法只好自定义一个RadioPreference,方法如下:
一、写一个只有RadioButton的layout:
<?xml version="1.0" encoding="utf-8"?>
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/radiobutton" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="4dip"
android:focusable="false" android:clickable="false">
</RadioButton>
二、定义RadioPreference类:
import android.app.Service;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.widget.Checkable;
public class RadioPreference extends Preference {
private CharSequence mSummaryOn;
private CharSequence mSummaryOff;
private boolean mSendAccessibilityEventViewClickedType;
private AccessibilityManager mAccessibilityManager;
private boolean mChecked;
private boolean mDisableDependentsState;
public RadioPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mAccessibilityManager = (AccessibilityManager) getContext()
.getSystemService(Service.ACCESSIBILITY_SERVICE);
}
public RadioPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mAccessibilityManager = (AccessibilityManager) getContext()
.getSystemService(Service.ACCESSIBILITY_SERVICE);
}
public RadioPreference(Context context) {
super(context);
}
@Override
public boolean isPersistent() {
return false;
}
@Override
protected void onBindView(View view) {
super.onBindView(view);
View checkboxView = view.findViewById(com.lenovo.tmp.R.id.radiobutton);
if (checkboxView != null && checkboxView instanceof Checkable) {
((Checkable) checkboxView).setChecked(mChecked);
if (mSendAccessibilityEventViewClickedType
&& mAccessibilityManager.isEnabled()
&& checkboxView.isEnabled()) {
mSendAccessibilityEventViewClickedType = false;
int eventType = AccessibilityEvent.TYPE_VIEW_CLICKED;
checkboxView.sendAccessibilityEventUnchecked(AccessibilityEvent
.obtain(eventType));
}
}
}
@Override
protected void onClick() {
super.onClick();
boolean newValue = !isChecked();
mSendAccessibilityEventViewClickedType = true;
if (!callChangeListener(newValue)) {
return;
}
setChecked(newValue);
}
/**
* Sets the checked state and saves it to the {@link SharedPreferences}.
*
* @param checked
* The checked state.
*/
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
persistBoolean(checked);
notifyDependencyChange(shouldDisableDependents());
notifyChanged();
}
}
/**
* Returns the checked state.
*
* @return The checked state.
*/
public boolean isChecked() {
return mChecked;
}
@Override
public boolean shouldDisableDependents() {
boolean shouldDisable = mDisableDependentsState ? mChecked : !mChecked;
return shouldDisable || super.shouldDisableDependents();
}
/**
* Sets the summary to be shown when checked.
*
* @param summary
* The summary to be shown when checked.
*/
public void setSummaryOn(CharSequence summary) {
mSummaryOn = summary;
if (isChecked()) {
notifyChanged();
}
}
/**
* @see #setSummaryOn(CharSequence)
* @param summaryResId
* The summary as a resource.
*/
public void setSummaryOn(int summaryResId) {
setSummaryOn(getContext().getString(summaryResId));
}
/**
* Returns the summary to be shown when checked.
*
* @return The summary.
*/
public CharSequence getSummaryOn() {
return mSummaryOn;
}
/**
* Sets the summary to be shown when unchecked.
*
* @param summary
* The summary to be shown when unchecked.
*/
public void setSummaryOff(CharSequence summary) {
mSummaryOff = summary;
if (!isChecked()) {
notifyChanged();
}
}
/**
* @see #setSummaryOff(CharSequence)
* @param summaryResId
* The summary as a resource.
*/
public void setSummaryOff(int summaryResId) {
setSummaryOff(getContext().getString(summaryResId));
}
/**
* Returns the summary to be shown when unchecked.
*
* @return The summary.
*/
public CharSequence getSummaryOff() {
return mSummaryOff;
}
/**
* Returns whether dependents are disabled when this preference is on (
* {@code true}) or when this preference is off ({@code false}).
*
* @return Whether dependents are disabled when this preference is on (
* {@code true}) or when this preference is off ({@code false}).
*/
public boolean getDisableDependentsState() {
return mDisableDependentsState;
}
/**
* Sets whether dependents are disabled when this preference is on (
* {@code true}) or when this preference is off ({@code false}).
*
* @param disableDependentsState
* The preference state that should disable dependents.
*/
public void setDisableDependentsState(boolean disableDependentsState) {
mDisableDependentsState = disableDependentsState;
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getBoolean(index, false);
}
@Override
protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
setChecked(restoreValue ? getPersistedBoolean(mChecked)
: (Boolean) defaultValue);
}
@Override
protected Parcelable onSaveInstanceState() {
final Parcelable superState = super.onSaveInstanceState();
if (isPersistent()) {
// No need to save instance state since it's persistent
return superState;
}
final SavedState myState = new SavedState(superState);
myState.checked = isChecked();
return myState;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (state == null || !state.getClass().equals(SavedState.class)) {
// Didn't save state for us in onSaveInstanceState
super.onRestoreInstanceState(state);
return;
}
SavedState myState = (SavedState) state;
super.onRestoreInstanceState(myState.getSuperState());
setChecked(myState.checked);
}
private static class SavedState extends BaseSavedState {
boolean checked;
public SavedState(Parcel source) {
super(source);
checked = source.readInt() == 1;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(checked ? 1 : 0);
}
public SavedState(Parcelable superState) {
super(superState);
}
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];
}
};
}
}
三、使用该组件:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="@string/openshare">
<com.tmp.ftp.RadioPreference
android:key="no_pwd" android:title="@string/no_pwd"
android:widgetLayout="@layout/radioview" />
<com.tmp.ftp.RadioPreference
android:key="use_ap_pwd" android:title="@string/mobileap_username_pwd"
android:widgetLayout="@layout/radioview" />
<com.tmp.ftp.RadioPreference
android:key="name_pwd" android:title="@string/ucustom_username_pwd"
android:widgetLayout="@layout/radioview" />
</PreferenceCategory>
</PreferenceScreen>
改类代码是仿照CheckboxBoxPrefrence类来写的。改动的部分很少。
这个自定义组件组件基本上可以使用了,但是有一个问题就是,没次启动该应用之后,所有的RadioButton都是未选中的,也就是说改组件没法自动保存,这个问题有待解决,也请大侠们指出问题所在,谢谢!!
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