M7350/base/core/java/android/preference/VolumePreference.java
2024-09-09 08:52:07 +00:00

357 lines
12 KiB
Java

/*
* Copyright (C) 2007 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 android.preference;
import android.app.Dialog;
import android.content.Context;
import android.content.res.TypedArray;
import android.database.ContentObserver;
import android.media.AudioManager;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Handler;
import android.os.Parcel;
import android.os.Parcelable;
import android.provider.Settings;
import android.provider.Settings.System;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.View;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
/**
* @hide
*/
public class VolumePreference extends SeekBarPreference implements
PreferenceManager.OnActivityStopListener, View.OnKeyListener {
private static final String TAG = "VolumePreference";
private int mStreamType;
/** May be null if the dialog isn't visible. */
private SeekBarVolumizer mSeekBarVolumizer;
public VolumePreference(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.VolumePreference, 0, 0);
mStreamType = a.getInt(android.R.styleable.VolumePreference_streamType, 0);
a.recycle();
}
public void setStreamType(int streamType) {
mStreamType = streamType;
}
@Override
protected void onBindDialogView(View view) {
super.onBindDialogView(view);
final SeekBar seekBar = (SeekBar) view.findViewById(com.android.internal.R.id.seekbar);
mSeekBarVolumizer = new SeekBarVolumizer(getContext(), seekBar, mStreamType);
getPreferenceManager().registerOnActivityStopListener(this);
// grab focus and key events so that pressing the volume buttons in the
// dialog doesn't also show the normal volume adjust toast.
view.setOnKeyListener(this);
view.setFocusableInTouchMode(true);
view.requestFocus();
}
public boolean onKey(View v, int keyCode, KeyEvent event) {
// If key arrives immediately after the activity has been cleaned up.
if (mSeekBarVolumizer == null) return true;
boolean isdown = (event.getAction() == KeyEvent.ACTION_DOWN);
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
if (isdown) {
mSeekBarVolumizer.changeVolumeBy(-1);
}
return true;
case KeyEvent.KEYCODE_VOLUME_UP:
if (isdown) {
mSeekBarVolumizer.changeVolumeBy(1);
}
return true;
default:
return false;
}
}
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
if (!positiveResult && mSeekBarVolumizer != null) {
mSeekBarVolumizer.revertVolume();
}
cleanup();
}
public void onActivityStop() {
cleanup();
}
/**
* Do clean up. This can be called multiple times!
*/
private void cleanup() {
getPreferenceManager().unregisterOnActivityStopListener(this);
if (mSeekBarVolumizer != null) {
Dialog dialog = getDialog();
if (dialog != null && dialog.isShowing()) {
View view = dialog.getWindow().getDecorView()
.findViewById(com.android.internal.R.id.seekbar);
if (view != null) view.setOnKeyListener(null);
// Stopped while dialog was showing, revert changes
mSeekBarVolumizer.revertVolume();
}
mSeekBarVolumizer.stop();
mSeekBarVolumizer = null;
}
}
protected void onSampleStarting(SeekBarVolumizer volumizer) {
if (mSeekBarVolumizer != null && volumizer != mSeekBarVolumizer) {
mSeekBarVolumizer.stopSample();
}
}
@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);
if (mSeekBarVolumizer != null) {
mSeekBarVolumizer.onSaveInstanceState(myState.getVolumeStore());
}
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());
if (mSeekBarVolumizer != null) {
mSeekBarVolumizer.onRestoreInstanceState(myState.getVolumeStore());
}
}
public static class VolumeStore {
public int volume = -1;
public int originalVolume = -1;
}
private static class SavedState extends BaseSavedState {
VolumeStore mVolumeStore = new VolumeStore();
public SavedState(Parcel source) {
super(source);
mVolumeStore.volume = source.readInt();
mVolumeStore.originalVolume = source.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(mVolumeStore.volume);
dest.writeInt(mVolumeStore.originalVolume);
}
VolumeStore getVolumeStore() {
return mVolumeStore;
}
public SavedState(Parcelable superState) {
super(superState);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
/**
* Turns a {@link SeekBar} into a volume control.
*/
public class SeekBarVolumizer implements OnSeekBarChangeListener, Runnable {
private Context mContext;
private Handler mHandler = new Handler();
private AudioManager mAudioManager;
private int mStreamType;
private int mOriginalStreamVolume;
private Ringtone mRingtone;
private int mLastProgress = -1;
private SeekBar mSeekBar;
private ContentObserver mVolumeObserver = new ContentObserver(mHandler) {
@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
if (mSeekBar != null) {
int volume = System.getInt(mContext.getContentResolver(),
System.VOLUME_SETTINGS[mStreamType], -1);
// Works around an atomicity problem with volume updates
// TODO: Fix the actual issue, probably in AudioService
if (volume >= 0) {
mSeekBar.setProgress(volume);
}
}
}
};
public SeekBarVolumizer(Context context, SeekBar seekBar, int streamType) {
mContext = context;
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mStreamType = streamType;
mSeekBar = seekBar;
initSeekBar(seekBar);
}
private void initSeekBar(SeekBar seekBar) {
seekBar.setMax(mAudioManager.getStreamMaxVolume(mStreamType));
mOriginalStreamVolume = mAudioManager.getStreamVolume(mStreamType);
seekBar.setProgress(mOriginalStreamVolume);
seekBar.setOnSeekBarChangeListener(this);
mContext.getContentResolver().registerContentObserver(
System.getUriFor(System.VOLUME_SETTINGS[mStreamType]),
false, mVolumeObserver);
Uri defaultUri = null;
if (mStreamType == AudioManager.STREAM_RING) {
defaultUri = Settings.System.DEFAULT_RINGTONE_URI;
} else if (mStreamType == AudioManager.STREAM_NOTIFICATION) {
defaultUri = Settings.System.DEFAULT_NOTIFICATION_URI;
} else {
defaultUri = Settings.System.DEFAULT_ALARM_ALERT_URI;
}
mRingtone = RingtoneManager.getRingtone(mContext, defaultUri);
if (mRingtone != null) {
mRingtone.setStreamType(mStreamType);
}
}
public void stop() {
stopSample();
mContext.getContentResolver().unregisterContentObserver(mVolumeObserver);
mSeekBar.setOnSeekBarChangeListener(null);
}
public void revertVolume() {
mAudioManager.setStreamVolume(mStreamType, mOriginalStreamVolume, 0);
}
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromTouch) {
if (!fromTouch) {
return;
}
postSetVolume(progress);
}
void postSetVolume(int progress) {
// Do the volume changing separately to give responsive UI
mLastProgress = progress;
mHandler.removeCallbacks(this);
mHandler.post(this);
}
public void onStartTrackingTouch(SeekBar seekBar) {
}
public void onStopTrackingTouch(SeekBar seekBar) {
if (mRingtone != null && !mRingtone.isPlaying()) {
sample();
}
}
public void run() {
mAudioManager.setStreamVolume(mStreamType, mLastProgress, 0);
}
private void sample() {
onSampleStarting(this);
mRingtone.play();
}
public void stopSample() {
if (mRingtone != null) {
mRingtone.stop();
}
}
public SeekBar getSeekBar() {
return mSeekBar;
}
public void changeVolumeBy(int amount) {
mSeekBar.incrementProgressBy(amount);
if (mRingtone != null && !mRingtone.isPlaying()) {
sample();
}
postSetVolume(mSeekBar.getProgress());
}
public void onSaveInstanceState(VolumeStore volumeStore) {
if (mLastProgress >= 0) {
volumeStore.volume = mLastProgress;
volumeStore.originalVolume = mOriginalStreamVolume;
}
}
public void onRestoreInstanceState(VolumeStore volumeStore) {
if (volumeStore.volume != -1) {
mOriginalStreamVolume = volumeStore.originalVolume;
mLastProgress = volumeStore.volume;
postSetVolume(mLastProgress);
}
}
}
}