Add master audio balance setting
This adds an audio balance slider to accessibility allowing the end user to adjust the audio balance between left and right channels. Test: Change Balance through Settings, play audio Bug: 28390736 Change-Id: I70f22d222ea310fd33ebe4f3fb054f44f69d2548
This commit is contained in:
committed by
Andy Hung
parent
12cec79889
commit
5042c9b41b
152
src/com/android/settings/accessibility/BalanceSeekBar.java
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152
src/com/android/settings/accessibility/BalanceSeekBar.java
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/*
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* Copyright (C) 2019 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 com.android.settings.accessibility;
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import android.content.Context;
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import android.content.res.ColorStateList;
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import android.content.res.Resources;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.os.UserHandle;
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import android.provider.Settings;
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import android.util.AttributeSet;
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import android.widget.SeekBar;
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import com.android.settings.R;
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/**
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* A custom seekbar for the balance setting.
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*
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* Adds a center line indicator between left and right, which snaps to if close.
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* Updates Settings.System for balance on progress changed.
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*/
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public class BalanceSeekBar extends SeekBar {
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private static final String TAG = "BalanceSeekBar";
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private final Context mContext;
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private final Object mListenerLock = new Object();
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private OnSeekBarChangeListener mOnSeekBarChangeListener;
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private final OnSeekBarChangeListener mProxySeekBarListener = new OnSeekBarChangeListener() {
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@Override
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public void onStopTrackingTouch(SeekBar seekBar) {
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synchronized(mListenerLock) {
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if (mOnSeekBarChangeListener != null) {
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mOnSeekBarChangeListener.onStopTrackingTouch(seekBar);
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}
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}
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}
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@Override
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public void onStartTrackingTouch(SeekBar seekBar) {
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synchronized(mListenerLock) {
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if (mOnSeekBarChangeListener != null) {
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mOnSeekBarChangeListener.onStartTrackingTouch(seekBar);
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}
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}
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}
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@Override
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public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
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if (fromUser) {
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// Snap to centre when within the specified threshold
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if (progress != mCenter
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&& progress > mCenter - mSnapThreshold
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&& progress < mCenter + mSnapThreshold) {
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progress = mCenter;
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seekBar.setProgress(progress); // direct update (fromUser becomes false)
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}
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final float balance = (progress - mCenter) * 0.01f;
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Settings.System.putFloatForUser(mContext.getContentResolver(),
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Settings.System.MASTER_BALANCE, balance, UserHandle.USER_CURRENT);
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}
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// If fromUser is false, the call is a set from the framework on creation or on
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// internal update. The progress may be zero, ignore (don't change system settings).
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// after adjusting the seekbar, notify downstream listener.
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// note that progress may have been adjusted in the code above to mCenter.
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synchronized(mListenerLock) {
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if (mOnSeekBarChangeListener != null) {
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mOnSeekBarChangeListener.onProgressChanged(seekBar, progress, fromUser);
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}
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}
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}
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};
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// Percentage of max to be used as a snap to threshold
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private static final float SNAP_TO_PERCENTAGE = 0.03f;
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private final Paint mCenterMarkerPaint;
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private final Rect mCenterMarkerRect;
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// changed in setMax()
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private float mSnapThreshold;
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private int mCenter;
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public BalanceSeekBar(Context context, AttributeSet attrs) {
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this(context, attrs, com.android.internal.R.attr.seekBarStyle);
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}
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public BalanceSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
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this(context, attrs, defStyleAttr, 0 /* defStyleRes */);
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}
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public BalanceSeekBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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mContext = context;
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Resources res = getResources();
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mCenterMarkerRect = new Rect(0 /* left */, 0 /* top */,
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res.getDimensionPixelSize(R.dimen.balance_seekbar_center_marker_width),
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res.getDimensionPixelSize(R.dimen.balance_seekbar_center_marker_height));
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mCenterMarkerPaint = new Paint();
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// TODO use a more suitable colour?
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mCenterMarkerPaint.setColor(Color.BLACK);
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mCenterMarkerPaint.setStyle(Paint.Style.FILL);
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// Remove the progress colour
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setProgressTintList(ColorStateList.valueOf(Color.TRANSPARENT));
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super.setOnSeekBarChangeListener(mProxySeekBarListener);
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}
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@Override
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public void setOnSeekBarChangeListener(OnSeekBarChangeListener listener) {
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synchronized(mListenerLock) {
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mOnSeekBarChangeListener = listener;
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}
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}
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// Note: the superclass AbsSeekBar.setMax is synchronized.
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@Override
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public synchronized void setMax(int max) {
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super.setMax(max);
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// update snap to threshold
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mCenter = max / 2;
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mSnapThreshold = max * SNAP_TO_PERCENTAGE;
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}
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// Note: the superclass AbsSeekBar.onDraw is synchronized.
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@Override
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protected synchronized void onDraw(Canvas canvas) {
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// Draw a vertical line at 50% that represents centred balance
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int seekBarCenter = (canvas.getHeight() - getPaddingBottom()) / 2;
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canvas.save();
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canvas.translate((canvas.getWidth() - mCenterMarkerRect.right) / 2,
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seekBarCenter - (mCenterMarkerRect.bottom / 2));
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canvas.drawRect(mCenterMarkerRect, mCenterMarkerPaint);
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canvas.restore();
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super.onDraw(canvas);
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}
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}
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