auto import from //depot/cupcake/@135843

1 files changed, 219 insertions, 0 deletions

diff --git a/core/java/android/preference/VolumePreference.java b/core/java/android/preference/VolumePreference.java
new file mode 100644
index 000000000000..6e215dcd7491
--- /dev/null
+++ b/core/java/android/preference/VolumePreference.java
@@ -0,0 +1,219 @@
+/*
+ * 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.content.Context;
+import android.content.res.TypedArray;
+import android.database.ContentObserver;
+import android.media.Ringtone;
+import android.media.RingtoneManager;
+import android.media.AudioManager;
+import android.os.Handler;
+import android.preference.PreferenceManager;
+import android.provider.Settings;
+import android.provider.Settings.System;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.SeekBar;
+import android.widget.SeekBar.OnSeekBarChangeListener;
+
+/**
+ * @hide
+ */
+public class VolumePreference extends SeekBarPreference implements 
+        PreferenceManager.OnActivityStopListener {
+
+    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);
+    }
+
+    @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) {
+           mSeekBarVolumizer.stop();
+           mSeekBarVolumizer = null;
+       }
+    }
+   
+    protected void onSampleStarting(SeekBarVolumizer volumizer) {
+        if (mSeekBarVolumizer != null && volumizer != mSeekBarVolumizer) {
+            mSeekBarVolumizer.stopSample();
+        }
+    }
+    
+    /**
+     * 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;
+        private SeekBar mSeekBar;
+        
+        private ContentObserver mVolumeObserver = new ContentObserver(mHandler) {
+            @Override
+            public void onChange(boolean selfChange) {
+                super.onChange(selfChange);
+    
+                if (mSeekBar != null) {
+                    mSeekBar.setProgress(System.getInt(mContext.getContentResolver(),
+                            System.VOLUME_SETTINGS[mStreamType], 0));
+                }
+            }
+        };
+    
+        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);
+    
+            mRingtone = RingtoneManager.getRingtone(mContext,
+                    mStreamType == AudioManager.STREAM_NOTIFICATION
+                            ? Settings.System.DEFAULT_NOTIFICATION_URI
+                            : Settings.System.DEFAULT_RINGTONE_URI);
+            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);
+        }
+
+        private 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() {
+    
+            // Only play a preview sample when controlling the ringer stream
+            if (mStreamType != AudioManager.STREAM_RING
+                    && mStreamType != AudioManager.STREAM_NOTIFICATION) {
+                return;
+            }
+    
+            onSampleStarting(this);
+            mRingtone.play();
+        }
+    
+        public void stopSample() {
+            if (mRingtone != null) {
+                mRingtone.stop();
+            }
+        }
+
+        public SeekBar getSeekBar() {
+            return mSeekBar;
+        }
+        
+    }
+}