Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License */ package rikka.materialpreference; import android.content.Context; import android.content.res.TypedArray; import android.support.v4.content.res.TypedArrayUtils; import android.support.v7.widget.SwitchCompat; import android.util.AttributeSet; import android.view.View; import android.view.accessibility.AccessibilityManager; import android.widget.CompoundButton; import android.widget.Switch; public class SwitchPreference extends TwoStatePreference { private final Listener mListener = new Listener(); // Switch text for on and off states private CharSequence mSwitchOn; private CharSequence mSwitchOff; private class Listener implements CompoundButton.OnCheckedChangeListener { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (!callChangeListener(isChecked)) { // Listener didn't like it, change it back. // CompoundButton will make sure we don't recurse. buttonView.setChecked(!isChecked); return; } SwitchPreference.this.setChecked(isChecked); } } /** * Construct a new SwitchPreference with the given style options. * * @param context The Context that will style this preference * @param attrs Style attributes that differ from the default * @param defStyleAttr An attribute in the current theme that contains a * reference to a style resource that supplies default values for * the view. Can be 0 to not look for defaults. * @param defStyleRes A resource identifier of a style resource that * supplies default values for the view, used only if * defStyleAttr is 0 or can not be found in the theme. Can be 0 * to not look for defaults. */ public SwitchPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SwitchPreference, defStyleAttr, defStyleRes); setSummaryOn(TypedArrayUtils.getString(a, R.styleable.SwitchPreference_summaryOn, R.styleable.SwitchPreference_android_summaryOn)); setSummaryOff(TypedArrayUtils.getString(a, R.styleable.SwitchPreference_summaryOff, R.styleable.SwitchPreference_android_summaryOff)); setSwitchTextOn(TypedArrayUtils.getString(a, R.styleable.SwitchPreference_switchTextOn, R.styleable.SwitchPreference_android_switchTextOn)); setSwitchTextOff(TypedArrayUtils.getString(a, R.styleable.SwitchPreference_switchTextOff, R.styleable.SwitchPreference_android_switchTextOff)); setDisableDependentsState(TypedArrayUtils.getBoolean(a, R.styleable.SwitchPreference_disableDependentsState, R.styleable.SwitchPreference_android_disableDependentsState, false)); a.recycle(); //setWidgetLayoutResource(R.layout.preference_switch_material); } /** * Construct a new SwitchPreference with the given style options. * * @param context The Context that will style this preference * @param attrs Style attributes that differ from the default * @param defStyleAttr An attribute in the current theme that contains a * reference to a style resource that supplies default values for * the view. Can be 0 to not look for defaults. */ public SwitchPreference(Context context, AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr, 0); } /** * Construct a new SwitchPreference with the given style options. * * @param context The Context that will style this preference * @param attrs Style attributes that differ from the default */ public SwitchPreference(Context context, AttributeSet attrs) { this(context, attrs, R.attr.switchPreferenceStyle); } /** * Construct a new SwitchPreference with default style options. * * @param context The Context that will style this preference */ public SwitchPreference(Context context) { this(context, null); } @Override public void onBindViewHolder(PreferenceViewHolder holder) { super.onBindViewHolder(holder); View switchView = holder.findViewById(R.id.switchWidget); syncSwitchView(switchView); syncSummaryView(holder); } @Override protected void onClick() { super.onClick(); mSetInPost = true; } /** * Set the text displayed on the switch widget in the on state. * This should be a very short string; one word if possible. * * @param onText Text to display in the on state */ public void setSwitchTextOn(CharSequence onText) { mSwitchOn = onText; notifyChanged(); } /** * Set the text displayed on the switch widget in the off state. * This should be a very short string; one word if possible. * * @param offText Text to display in the off state */ public void setSwitchTextOff(CharSequence offText) { mSwitchOff = offText; notifyChanged(); } /** * Set the text displayed on the switch widget in the on state. * This should be a very short string; one word if possible. * * @param resId The text as a string resource ID */ public void setSwitchTextOn(int resId) { setSwitchTextOn(getContext().getString(resId)); } /** * Set the text displayed on the switch widget in the off state. * This should be a very short string; one word if possible. * * @param resId The text as a string resource ID */ public void setSwitchTextOff(int resId) { setSwitchTextOff(getContext().getString(resId)); } /** * @return The text that will be displayed on the switch widget in the on state */ public CharSequence getSwitchTextOn() { return mSwitchOn; } /** * @return The text that will be displayed on the switch widget in the off state */ public CharSequence getSwitchTextOff() { return mSwitchOff; } /** * @hide */ private boolean mSetInPost; @Override protected void performClick(View view) { super.performClick(view); syncViewIfAccessibilityEnabled(view); } private void syncViewIfAccessibilityEnabled(View view) { AccessibilityManager accessibilityManager = (AccessibilityManager) getContext() .getSystemService(Context.ACCESSIBILITY_SERVICE); if (!accessibilityManager.isEnabled()) { return; } View switchView = view.findViewById(R.id.switchWidget); syncSwitchView(switchView); View summaryView = view.findViewById(android.R.id.summary); syncSummaryView(summaryView); } private void syncSwitchView(final View view) { if (view instanceof CompoundButton) { CompoundButton switchView = (CompoundButton) view; switchView.setOnCheckedChangeListener(null); if (!mSetInPost) { switchView.setChecked(mChecked); } else { view.post(new Runnable() { @Override public void run() { ((CompoundButton) view).setChecked(mChecked); mSetInPost = false; } }); } if (view instanceof Switch) { ((Switch) switchView).setTextOn(mSwitchOn); ((Switch) switchView).setTextOff(mSwitchOff); } else if (view instanceof SwitchCompat) { ((SwitchCompat) switchView).setTextOn(mSwitchOn); ((SwitchCompat) switchView).setTextOff(mSwitchOff); } switchView.setOnCheckedChangeListener(mListener); } } }