自定义android RadioPreference组件

作者：jxnktjlfr

标签： android RadioPreference Preference OPhone开发┆ 评论(0) ┆ 阅读(9)

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：

Java代码 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 = newParcelable.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>

自定义android RadioPreference组件