android 铃声设置流程讲解

总体思路为：
1.截取铃声
2.保存入sd卡
3.获取铃声信息
4.将信息和文件路径写入数据库获得铃声Uri
5.将获得的Uri设置为铃声。
核心实现：在
public class DefaultRingtonePreference extends RingtonePreference {
private static final String TAG = "DefaultRingtonePreference";
public DefaultRingtonePreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onPrepareRingtonePickerIntent(Intent ringtonePickerIntent) {
super.onPrepareRingtonePickerIntent(ringtonePickerIntent);
/*
* Since this preference is for choosing the default ringtone, it
* doesn't make sense to show a 'Default' item.
*/
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, false);
}
@Override
protected void onSaveRingtone(Uri ringtoneUri) { //注意这个方法他是实现铃声设置的核心方法
RingtoneManager.setActualDefaultRingtoneUri(getContext(), getRingtoneType(), ringtoneUri);
}
@Override
protected Uri onRestoreRingtone() {
return RingtoneManager.getActualDefaultRingtoneUri(getContext(), getRingtoneType());
}
}
DefaultRingtonePreference 单机后出现的是一个AlertDialog 但是在DefaultRingtonePreference没看见任何构造Dialog的信息显然构建在父亲那的于是出现RingtonePreference的代码：
public class RingtonePreference extends Preference implements PreferenceManager.OnActivityResultListener {
private static final String TAG = "RingtonePreference";
private int mRingtoneType;
private boolean mShowDefault;
private boolean mShowSilent;
private int mRequestCode;
public RingtonePreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.RingtonePreference, defStyle, 0);
mRingtoneType = a.getInt(com.android.internal.R.styleable.RingtonePreference_ringtoneType, RingtoneManager.TYPE_RINGTONE);
mShowDefault = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showDefault, true);
mShowSilent = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showSilent, true);
a.recycle();
}
public RingtonePreference(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.ringtonePreferenceStyle);
}
public RingtonePreference(Context context) {
this(context, null);
}
/**
* Returns the sound type(s) that are shown in the picker.
*
* @return The sound type(s) that are shown in the picker.
* @see #setRingtoneType(int)
*/
public int getRingtoneType() {
return mRingtoneType;
}
/**
* Sets the sound type(s) that are shown in the picker.
*
* @param type
*            The sound type(s) that are shown in the picker.
* @see RingtoneManager#EXTRA_RINGTONE_TYPE
*/
public void setRingtoneType(int type) {
mRingtoneType = type;
}
/**
* Returns whether to a show an item for the default sound/ringtone.
*
* @return Whether to show an item for the default sound/ringtone.
*/
public boolean getShowDefault() {
return mShowDefault;
}
/**
* Sets whether to show an item for the default sound/ringtone. The default
* to use will be deduced from the sound type(s) being shown.
*
* @param showDefault
*            Whether to show the default or not.
* @see RingtoneManager#EXTRA_RINGTONE_SHOW_DEFAULT
*/
public void setShowDefault(boolean showDefault) {
mShowDefault = showDefault;
}
/**
* Returns whether to a show an item for 'Silent'.
*
* @return Whether to show an item for 'Silent'.
*/
public boolean getShowSilent() {
return mShowSilent;
}
/**
* Sets whether to show an item for 'Silent'.
*
* @param showSilent
*            Whether to show 'Silent'.
* @see RingtoneManager#EXTRA_RINGTONE_SHOW_SILENT
*/
public void setShowSilent(boolean showSilent) {
mShowSilent = showSilent;
}
@Override
protected void onClick() { //注意这对DefaultRingtonePreference单机事件左的处理有跳转
// Launch the ringtone picker
Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
onPrepareRingtonePickerIntent(intent);
getPreferenceManager().getActivity().startActivityForResult(intent, mRequestCode);
}
/**
* Prepares the intent to launch the ringtone picker. This can be modified
* to adjust the parameters of the ringtone picker.
*
* @param ringtonePickerIntent
*            The ringtone picker intent that can be modified by putting
*            extras.
*/
protected void onPrepareRingtonePickerIntent(Intent ringtonePickerIntent) {
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, onRestoreRingtone());
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, mShowDefault);
if (mShowDefault) {
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_DEFAULT_URI, RingtoneManager.getDefaultUri(getRingtoneType()));
}
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, mShowSilent);
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, mRingtoneType);
}
/**
* Called when a ringtone is chosen.
* <p>
* By default, this saves the ringtone URI to the persistent storage as a
* string.
*
* @param ringtoneUri
*            The chosen ringtone's {@link Uri}. Can be null.
*/
protected void onSaveRingtone(Uri ringtoneUri) {
persistString(ringtoneUri != null ? ringtoneUri.toString() : "");
}
/**
* Called when the chooser is about to be shown and the current ringtone
* should be marked. Can return null to not mark any ringtone.
* <p>
* By default, this restores the previous ringtone URI from the persistent
* storage.
*
* @return The ringtone to be marked as the current ringtone.
*/
protected Uri onRestoreRingtone() {
final String uriString = getPersistedString(null);
return !TextUtils.isEmpty(uriString) ? Uri.parse(uriString) : null;
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getString(index);
}
@Override
protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValueObj) {
String defaultValue = (String) defaultValueObj;
/*
* This method is normally to make sure the internal state and UI
* matches either the persisted value or the default value. Since we
* don't show the current value in the UI (until the dialog is opened)
* and we don't keep local state, if we are restoring the persisted
* value we don't need to do anything.
*/
if (restorePersistedValue) {
return;
}
// If we are setting to the default value, we should persist it.
if (!TextUtils.isEmpty(defaultValue)) {
onSaveRingtone(Uri.parse(defaultValue));
}
}
@Override
protected void onAttachedToHierarchy(PreferenceManager preferenceManager) {
super.onAttachedToHierarchy(preferenceManager);
preferenceManager.registerOnActivityResultListener(this);
mRequestCode = preferenceManager.getNextRequestCode();
}
public boolean onActivityResult(int requestCode, int resultCode, Intent data) { //注意该方法回调了子类的onSaveRingtone方法
if (requestCode == mRequestCode) {
if (data != null) {
Uri uri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
if (callChangeListener(uri != null ? uri.toString() : "")) {
onSaveRingtone(uri);
}
}
return true;
}
return false;
}
}
对DefaultRingtonePreference的单机跳转到 RingtonePickerActivity.java 下篇
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