320 lines
10 KiB
Java
320 lines
10 KiB
Java
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.preference;
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import android.app.Service;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.content.res.TypedArray;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.accessibility.AccessibilityEvent;
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import android.view.accessibility.AccessibilityManager;
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import android.widget.Checkable;
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import android.widget.TextView;
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/**
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* A {@link Preference} that provides checkbox widget
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* functionality.
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* <p>
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* This preference will store a boolean into the SharedPreferences.
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*
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* @attr ref android.R.styleable#CheckBoxPreference_summaryOff
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* @attr ref android.R.styleable#CheckBoxPreference_summaryOn
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* @attr ref android.R.styleable#CheckBoxPreference_disableDependentsState
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*/
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public class CheckBoxPreference extends Preference {
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private CharSequence mSummaryOn;
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private CharSequence mSummaryOff;
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private boolean mChecked;
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private boolean mSendAccessibilityEventViewClickedType;
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private AccessibilityManager mAccessibilityManager;
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private boolean mDisableDependentsState;
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public CheckBoxPreference(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a = context.obtainStyledAttributes(attrs,
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com.android.internal.R.styleable.CheckBoxPreference, defStyle, 0);
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mSummaryOn = a.getString(com.android.internal.R.styleable.CheckBoxPreference_summaryOn);
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mSummaryOff = a.getString(com.android.internal.R.styleable.CheckBoxPreference_summaryOff);
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mDisableDependentsState = a.getBoolean(
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com.android.internal.R.styleable.CheckBoxPreference_disableDependentsState, false);
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a.recycle();
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mAccessibilityManager =
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(AccessibilityManager) getContext().getSystemService(Service.ACCESSIBILITY_SERVICE);
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}
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public CheckBoxPreference(Context context, AttributeSet attrs) {
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this(context, attrs, com.android.internal.R.attr.checkBoxPreferenceStyle);
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}
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public CheckBoxPreference(Context context) {
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this(context, null);
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}
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@Override
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protected void onBindView(View view) {
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super.onBindView(view);
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View checkboxView = view.findViewById(com.android.internal.R.id.checkbox);
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if (checkboxView != null && checkboxView instanceof Checkable) {
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((Checkable) checkboxView).setChecked(mChecked);
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// send an event to announce the value change of the CheckBox and is done here
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// because clicking a preference does not immediately change the checked state
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// for example when enabling the WiFi
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if (mSendAccessibilityEventViewClickedType &&
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mAccessibilityManager.isEnabled() &&
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checkboxView.isEnabled()) {
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mSendAccessibilityEventViewClickedType = false;
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int eventType = AccessibilityEvent.TYPE_VIEW_CLICKED;
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checkboxView.sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType));
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}
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}
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// Sync the summary view
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TextView summaryView = (TextView) view.findViewById(com.android.internal.R.id.summary);
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if (summaryView != null) {
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boolean useDefaultSummary = true;
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if (mChecked && mSummaryOn != null) {
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summaryView.setText(mSummaryOn);
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useDefaultSummary = false;
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} else if (!mChecked && mSummaryOff != null) {
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summaryView.setText(mSummaryOff);
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useDefaultSummary = false;
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}
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if (useDefaultSummary) {
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final CharSequence summary = getSummary();
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if (summary != null) {
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summaryView.setText(summary);
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useDefaultSummary = false;
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}
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}
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int newVisibility = View.GONE;
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if (!useDefaultSummary) {
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// Someone has written to it
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newVisibility = View.VISIBLE;
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}
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if (newVisibility != summaryView.getVisibility()) {
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summaryView.setVisibility(newVisibility);
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}
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}
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}
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@Override
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protected void onClick() {
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super.onClick();
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boolean newValue = !isChecked();
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// in onBindView() an AccessibilityEventViewClickedType is sent to announce the change
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// not sending
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mSendAccessibilityEventViewClickedType = true;
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if (!callChangeListener(newValue)) {
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return;
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}
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setChecked(newValue);
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}
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/**
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* Sets the checked state and saves it to the {@link SharedPreferences}.
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*
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* @param checked The checked state.
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*/
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public void setChecked(boolean checked) {
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if (mChecked != checked) {
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mChecked = checked;
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persistBoolean(checked);
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notifyDependencyChange(shouldDisableDependents());
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notifyChanged();
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}
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}
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/**
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* Returns the checked state.
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*
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* @return The checked state.
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*/
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public boolean isChecked() {
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return mChecked;
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}
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@Override
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public boolean shouldDisableDependents() {
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boolean shouldDisable = mDisableDependentsState ? mChecked : !mChecked;
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return shouldDisable || super.shouldDisableDependents();
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}
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/**
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* Sets the summary to be shown when checked.
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*
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* @param summary The summary to be shown when checked.
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*/
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public void setSummaryOn(CharSequence summary) {
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mSummaryOn = summary;
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if (isChecked()) {
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notifyChanged();
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}
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}
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/**
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* @see #setSummaryOn(CharSequence)
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* @param summaryResId The summary as a resource.
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*/
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public void setSummaryOn(int summaryResId) {
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setSummaryOn(getContext().getString(summaryResId));
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}
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/**
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* Returns the summary to be shown when checked.
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* @return The summary.
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*/
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public CharSequence getSummaryOn() {
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return mSummaryOn;
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}
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/**
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* Sets the summary to be shown when unchecked.
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*
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* @param summary The summary to be shown when unchecked.
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*/
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public void setSummaryOff(CharSequence summary) {
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mSummaryOff = summary;
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if (!isChecked()) {
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notifyChanged();
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}
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}
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/**
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* @see #setSummaryOff(CharSequence)
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* @param summaryResId The summary as a resource.
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*/
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public void setSummaryOff(int summaryResId) {
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setSummaryOff(getContext().getString(summaryResId));
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}
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/**
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* Returns the summary to be shown when unchecked.
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* @return The summary.
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*/
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public CharSequence getSummaryOff() {
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return mSummaryOff;
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}
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/**
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* Returns whether dependents are disabled when this preference is on ({@code true})
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* or when this preference is off ({@code false}).
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*
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* @return Whether dependents are disabled when this preference is on ({@code true})
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* or when this preference is off ({@code false}).
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*/
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public boolean getDisableDependentsState() {
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return mDisableDependentsState;
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}
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/**
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* Sets whether dependents are disabled when this preference is on ({@code true})
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* or when this preference is off ({@code false}).
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*
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* @param disableDependentsState The preference state that should disable dependents.
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*/
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public void setDisableDependentsState(boolean disableDependentsState) {
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mDisableDependentsState = disableDependentsState;
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}
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@Override
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protected Object onGetDefaultValue(TypedArray a, int index) {
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return a.getBoolean(index, false);
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}
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@Override
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protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
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setChecked(restoreValue ? getPersistedBoolean(mChecked)
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: (Boolean) defaultValue);
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}
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@Override
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protected Parcelable onSaveInstanceState() {
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final Parcelable superState = super.onSaveInstanceState();
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if (isPersistent()) {
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// No need to save instance state since it's persistent
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return superState;
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}
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final SavedState myState = new SavedState(superState);
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myState.checked = isChecked();
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return myState;
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}
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@Override
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protected void onRestoreInstanceState(Parcelable state) {
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if (state == null || !state.getClass().equals(SavedState.class)) {
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// Didn't save state for us in onSaveInstanceState
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super.onRestoreInstanceState(state);
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return;
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}
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SavedState myState = (SavedState) state;
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super.onRestoreInstanceState(myState.getSuperState());
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setChecked(myState.checked);
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}
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private static class SavedState extends BaseSavedState {
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boolean checked;
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public SavedState(Parcel source) {
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super(source);
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checked = source.readInt() == 1;
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}
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@Override
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public void writeToParcel(Parcel dest, int flags) {
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super.writeToParcel(dest, flags);
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dest.writeInt(checked ? 1 : 0);
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}
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public SavedState(Parcelable superState) {
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super(superState);
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}
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public static final Parcelable.Creator<SavedState> CREATOR =
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new Parcelable.Creator<SavedState>() {
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public SavedState createFromParcel(Parcel in) {
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return new SavedState(in);
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}
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public SavedState[] newArray(int size) {
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return new SavedState[size];
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}
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};
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}
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}
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