me -->
<com.mediatek.audioprofile.VolumeSeekBarPreference
android:key="ring_volume"
android:icon="@*android:drawable/ic_audio_ring_notif"
android:title="@string/ring_volume_option_title" />
<!-- Call volume -->
<com.mediatek.audioprofile.VolumeSeekBarPreference
android:key="call_volume"
android:icon="@drawable/ic_volume_voice"
android:title="@string/call_volume_option_title" />
对应的drawable文件时从SystemUI中拷贝过来的，ic_volume_voice.xml
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:height="24.0dp"
android:viewportHeight="48.0"
android:viewportWidth="48.0"
android:width="24.0dp" >
<path
android:fillColor="#ff727272"
android:pathData="M13.25,21.59c2.88,5.66 7.51,10.29 13.18,13.17l4.4,-4.41c0.55,-0.55 1.34,-0.71 2.03,-0.49C35.1,30.6 37.51,31.0 40.0,31.0c1.11,0.0 2.0,0.89 2.0,2.0l0.0,7.0c0.0,1.11 -0.89,2.0 -2.0,2.0C21.22,42.0 6.0,26.78 6.0,8.0c0.0,-1.1 0.9,-2.0 2.0,-2.0l7.0,0.0c1.11,0.0 2.0,0.89 2.0,2.0 0.0,2.4 0.4,4.9 1.14,7.1 0.2,0.6 0.06,1.48 -0.49,2.03l-4.4,4.42z" />
</vector>
接下来对应到 Editprofile.java 文件中，可以看到 KEY_ALARM_VOLUME 对应的preference初始化，依旧照葫芦画瓢，添加 KEY_CALL_VOLUME
private void initVolume(PreferenceScreen parent) {
initVolumePreference(KEY_MEDIA_VOLUME, AudioManager.STREAM_MUSIC);
initVolumePreference(KEY_ALARM_VOLUME, AudioManager.STREAM_ALARM);
initVolumePreference(KEY_CALL_VOLUME, AudioManager.STREAM_VOICE_CALL);
if (mVoiceCapable) {
mVolume = initVolumePreference(KEY_RING_VOLUME, AudioManager.STREAM_RING);
parent.removePreference(parent.findPreference(KEY_NOTIFICATION_VOLUME));
} else {
mVolume = initVolumePreference(KEY_NOTIFICATION_VOLUME,
AudioManager.STREAM_NOTIFICATION);
parent.removePreference(parent.findPreference(KEY_RING_VOLUME));
}
}
重新编译，push替换后发现，UI倒是出来了，但是无法滑动，事情果然没那么简单，继续查看 initVolumePreference（）
private VolumeSeekBarPreference initVolumePreference(String key, int stream) {
Log.d("@M_" + TAG, "Init volume preference, key = " + key + ",stream = " + stream);
final VolumeSeekBarPreference volumePref = (VolumeSeekBarPreference) findPreference(key);
volumePref.setStream(stream);
volumePref.setCallback(mVolumeCallback);
volumePref.setProfile(mKey);
return volumePref;
}
保存了当前的音量调节类型，设置seekBar回调事件，接下来看看回调处理了什么
private final class VolumePreferenceCallback implements VolumeSeekBarPreference.Callback {
private SeekBarVolumizer mCurrent;
@Override
public void onSampleStarting(SeekBarVolumizer sbv) {
if (mCurrent != null && mCurrent != sbv) {
mCurrent.stopSample();
}
mCurrent = sbv;
if (mCurrent != null) {
mHandler.removeMessages(H.STOP_SAMPLE);
mHandler.sendEmptyMessageDelayed(H.STOP_SAMPLE, SAMPLE_CUTOFF);
}
}
public void onStreamValueChanged(int stream, int progress) {
if (stream == AudioManager.STREAM_RING) {
mHandler.removeMessages(H.UPDATE_RINGER_ICON);
mHandler.obtainMessage(H.UPDATE_RINGER_ICON, progress, 0).sendToTarget();
}
}
public void stopSample() {
if (mCurrent != null) {
mCurrent.stopSample();
}
}
public void ringtoneCh