VolumePreference.java revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.preference;
18
19import android.content.ContentResolver;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.database.ContentObserver;
23import android.media.Ringtone;
24import android.media.RingtoneManager;
25import android.media.AudioManager;
26import android.os.Handler;
27import android.preference.PreferenceManager;
28import android.provider.Settings;
29import android.provider.Settings.System;
30import android.util.AttributeSet;
31import android.view.View;
32import android.widget.SeekBar;
33import android.widget.SeekBar.OnSeekBarChangeListener;
34
35/**
36 * @hide
37 */
38public class VolumePreference extends SeekBarPreference implements OnSeekBarChangeListener,
39        Runnable, PreferenceManager.OnActivityStopListener {
40
41    private static final String TAG = "VolumePreference";
42
43    private ContentResolver mContentResolver;
44    private Handler mHandler = new Handler();
45
46    private AudioManager mVolume;
47    private int mStreamType;
48    private int mOriginalStreamVolume;
49    private Ringtone mRingtone;
50
51    private int mLastProgress;
52    private SeekBar mSeekBar;
53
54    private ContentObserver mVolumeObserver = new ContentObserver(mHandler) {
55        @Override
56        public void onChange(boolean selfChange) {
57            super.onChange(selfChange);
58
59            if (mSeekBar != null) {
60                mSeekBar.setProgress(System.getInt(mContentResolver,
61                        System.VOLUME_SETTINGS[mStreamType], 0));
62            }
63        }
64    };
65
66    public VolumePreference(Context context, AttributeSet attrs) {
67        super(context, attrs);
68
69        TypedArray a = context.obtainStyledAttributes(attrs,
70                com.android.internal.R.styleable.VolumePreference, 0, 0);
71        mStreamType = a.getInt(android.R.styleable.VolumePreference_streamType, 0);
72        a.recycle();
73
74        mContentResolver = context.getContentResolver();
75
76        mVolume = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
77    }
78
79    @Override
80    protected void onBindDialogView(View view) {
81        super.onBindDialogView(view);
82
83        final SeekBar seekBar = mSeekBar = (SeekBar) view.findViewById(com.android.internal.R.id.seekbar);
84        seekBar.setMax(mVolume.getStreamMaxVolume(mStreamType));
85        mOriginalStreamVolume = mVolume.getStreamVolume(mStreamType);
86        seekBar.setProgress(mOriginalStreamVolume);
87        seekBar.setOnSeekBarChangeListener(this);
88
89        mContentResolver.registerContentObserver(System.getUriFor(System.VOLUME_SETTINGS[mStreamType]), false, mVolumeObserver);
90
91        getPreferenceManager().registerOnActivityStopListener(this);
92        mRingtone = RingtoneManager.getRingtone(getContext(), Settings.System.DEFAULT_RINGTONE_URI);
93    }
94
95    @Override
96    protected void onDialogClosed(boolean positiveResult) {
97        super.onDialogClosed(positiveResult);
98
99        if (!positiveResult) {
100            mVolume.setStreamVolume(mStreamType, mOriginalStreamVolume, 0);
101        }
102
103        cleanup();
104    }
105
106
107    public void onActivityStop() {
108        cleanup();
109    }
110
111    /**
112     * Do clean up.  This can be called multiple times!
113     */
114    private void cleanup() {
115        stopSample();
116        if (mVolumeObserver != null) {
117            mContentResolver.unregisterContentObserver(mVolumeObserver);
118        }
119        getPreferenceManager().unregisterOnActivityStopListener(this);
120        mSeekBar = null;
121    }
122
123    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
124        if (!fromTouch) {
125            return;
126        }
127
128        postSetVolume(progress);
129    }
130
131    private void postSetVolume(int progress) {
132        // Do the volume changing separately to give responsive UI
133        mLastProgress = progress;
134        mHandler.removeCallbacks(this);
135        mHandler.post(this);
136    }
137
138    public void onStartTrackingTouch(SeekBar seekBar) {
139    }
140
141    public void onStopTrackingTouch(SeekBar seekBar) {
142        if (mRingtone != null && !mRingtone.isPlaying()) {
143            sample();
144        }
145    }
146
147    public void run() {
148        mVolume.setStreamVolume(mStreamType, mLastProgress, 0);
149    }
150
151    private void sample() {
152        mRingtone.play();
153    }
154
155    private void stopSample() {
156        if (mRingtone != null) {
157            mRingtone.stop();
158        }
159    }
160
161}
162