TwoStatePreference.java

package org.holoeverywhere.preference;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build.VERSION;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.widget.TextView;

public abstract class TwoStatePreference extends Preference {

    static class SavedState extends BaseSavedState {
        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];
            }
        };

        boolean checked;

        public SavedState(Parcel source) {
            super(source);
            checked = source.readInt() == 1;
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(checked ? 1 : 0);
        }
    }

    boolean mChecked;
    private boolean mDisableDependentsState;
    private boolean mSendClickAccessibilityEvent;
    private CharSequence mSummaryOff, mSummaryOn;

    public TwoStatePreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        context = getContext();
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TwoStatePreference,
                defStyle, R.style.Holo_PreferenceTwoState);
        mSummaryOn = a.getText(R.styleable.TwoStatePreference_summaryOn);
        mSummaryOff = a.getText(R.styleable.TwoStatePreference_summaryOff);
        mDisableDependentsState = a.getBoolean(
                R.styleable.TwoStatePreference_disableDependentsState, false);
        a.recycle();
    }

    public boolean getDisableDependentsState() {
        return mDisableDependentsState;
    }

    public CharSequence getSummaryOff() {
        return mSummaryOff;
    }

    public CharSequence getSummaryOn() {
        return mSummaryOn;
    }

    public boolean isChecked() {
        return mChecked;
    }

    @Override
    protected void onClick() {
        super.onClick();
        boolean newValue = !isChecked();
        mSendClickAccessibilityEvent = true;
        if (!callChangeListener(newValue)) {
            return;
        }
        setChecked(newValue);
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getBoolean(index, false);
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state == null || !state.getClass().equals(SavedState.class)) {
            super.onRestoreInstanceState(state);
            return;
        }
        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        setChecked(myState.checked);
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            return superState;
        }

        final SavedState myState = new SavedState(superState);
        myState.checked = isChecked();
        return myState;
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setChecked(restoreValue ? getPersistedBoolean(mChecked)
                : (Boolean) defaultValue);
    }

    @SuppressLint("NewApi")
    void sendAccessibilityEvent(View view) {
        try {
            AccessibilityManager accessibilityManager = (AccessibilityManager) getContext()
                    .getSystemService(Context.ACCESSIBILITY_SERVICE);
            if (mSendClickAccessibilityEvent
                    && accessibilityManager.isEnabled()) {
                AccessibilityEvent event = AccessibilityEvent.obtain();
                event.setEventType(AccessibilityEvent.TYPE_VIEW_CLICKED);
                if (VERSION.SDK_INT >= 14) {
                    view.onInitializeAccessibilityEvent(event);
                }
                view.dispatchPopulateAccessibilityEvent(event);
                accessibilityManager.sendAccessibilityEvent(event);
            }
        } catch (Exception e) {
        }
        mSendClickAccessibilityEvent = false;
    }

    public void setChecked(boolean checked) {
        if (mChecked != checked) {
            mChecked = checked;
            persistBoolean(checked);
            notifyDependencyChange(shouldDisableDependents());
            notifyChanged();
        }
    }

    public void setDisableDependentsState(boolean disableDependentsState) {
        mDisableDependentsState = disableDependentsState;
    }

    public void setSummaryOff(CharSequence summary) {
        mSummaryOff = summary;
        if (!isChecked()) {
            notifyChanged();
        }
    }

    public void setSummaryOff(int summaryResId) {
        setSummaryOff(getContext().getString(summaryResId));
    }

    public void setSummaryOn(CharSequence summary) {
        mSummaryOn = summary;
        if (isChecked()) {
            notifyChanged();
        }
    }

    public void setSummaryOn(int summaryResId) {
        setSummaryOn(getContext().getString(summaryResId));
    }

    @Override
    public boolean shouldDisableDependents() {
        return mDisableDependentsState ? mChecked : !mChecked
                || super.shouldDisableDependents();
    }

    void syncSummaryView(View view) {
        TextView summaryView = (TextView) view.findViewById(R.id.summary);
        if (summaryView != null) {
            boolean useDefaultSummary = true;
            if (mChecked && mSummaryOn != null) {
                summaryView.setText(mSummaryOn);
                useDefaultSummary = false;
            } else if (!mChecked && mSummaryOff != null) {
                summaryView.setText(mSummaryOff);
                useDefaultSummary = false;
            }
            if (useDefaultSummary) {
                final CharSequence summary = getSummary();
                if (summary != null) {
                    summaryView.setText(summary);
                    useDefaultSummary = false;
                }
            }
            int newVisibility = useDefaultSummary ? View.GONE : View.VISIBLE;
            if (newVisibility != summaryView.getVisibility()) {
                summaryView.setVisibility(newVisibility);
            }
        }
    }
}