/**
* Updates the preference that controls whether TalkBack will attempt to request Explore by Touch.
*
* @param requestedState The state requested by the user.
* @return Whether to update the reflected state.
*/
private boolean setTouchExplorationRequested(boolean requestedState) {
final SharedPreferences prefs =
PreferenceManager.getDefaultSharedPreferences(TalkBackPreferencesActivity.this);
// Update the "requested" state. This will trigger a listener in
// TalkBack that changes the "actual" state.
SharedPreferencesUtils.putBooleanPref(
prefs, getResources(), R.string.pref_explore_by_touch_key, requestedState);
// If TalkBack is inactive, we should immediately reflect the change in
// "requested" state.
if (!MyAccessibilityService.isServiceActive()) {
return true;
}
if (requestedState && MyAccessibilityService.getInstance() != null) {
// TODO
// MyAccessibilityService.getInstance().showTutorial();
}
// If accessibility is on, we should wait for the "actual" state to
// change, then reflect that change. If the user declines the system's
// touch exploration dialog, the "actual" state will not change and
// nothing needs to happen.
LogUtils.log(this, Log.DEBUG, "TalkBack active, waiting for EBT request to take effect");
return false;
}
@Override
public void onPause() {
super.onPause();
MyAccessibilityService talkBackService = MyAccessibilityService.getInstance();
if (talkBackService != null && talkBackService.supportsTouchScreen()) {
getContentResolver().unregisterContentObserver(mTouchExploreObserver);
}
if (mExploreByTouchDialog != null) {
mExploreByTouchDialog.dismiss();
}
if (mTreeDebugDialog != null) {
mTreeDebugDialog.dismiss();
}
}
@Override
public void onResume() {
super.onResume();
MyAccessibilityService talkBackService = MyAccessibilityService.getInstance();
if (talkBackService != null && talkBackService.supportsTouchScreen()) {
registerTouchSettingObserver();
}
if (mExploreByTouchDialog != null) {
mExploreByTouchDialog.show();
}
if (mTreeDebugDialog != null) {
mTreeDebugDialog.show();
}
updateTalkBackShortcutStatus();
updateDimingPreferenceStatus();
}
private void updateDimingPreferenceStatus() {
final CheckBoxPreference dimPreference =
(CheckBoxPreference) findPreferenceByResId(R.string.pref_dim_when_talkback_enabled_key);
if (dimPreference == null) {
return;
}
if (Build.VERSION.SDK_INT < ProcessorVolumeStream.MIN_API_LEVEL) {
final PreferenceGroup category =
(PreferenceGroup) findPreferenceByResId(R.string.pref_category_miscellaneous_key);
if (category == null) {
return;
}
category.removePreference(dimPreference);
return;
}
dimPreference.setEnabled(MyAccessibilityService.isServiceActive() || dimPreference.isChecked());
dimPreference.setOnPreferenceChangeListener(
new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
if (newValue == null || !(newValue instanceof Boolean)) {
return true;
}
boolean boolValue = (Boolean) newValue;
if (!boolValue && !MyAccessibilityService.isServiceActive()) {
dimPreference.setEnabled(false);
} else if (boolValue
&& mPrefs.getBoolean(
getString(R.string.pref_show_dim_screen_confirmation_dialog), true)) {
showDimScreenDialog(
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dimPreference.setChecked(true);
}
});
return false;
}
return true;
}
});
}
private void updateTalkBackShortcutStatus() {
final CheckBoxPreference preference =
(CheckBoxPreference) findPreferenceByResId(R.string.pref_two_volume_long_press_key);
if (preference == null) {
return;
}
if (Build.VERSION.SDK_INT >= ProcessorVolumeStream.MIN_API_LEVEL) {
preference.setEnabled(MyAccessibilityService.getInstance() != null || preference.isChecked());
} else {
final PreferenceGroup category =
(PreferenceGroup) findPreferenceByResId(R.string.pref_category_miscellaneous_key);
if (category == null) {
return;
}
category.removePreference(preference);
}
}
/**
* Updates the preferences state to match the actual state of touch exploration. This is called
* once when the preferences activity launches and again whenever the actual state of touch
* exploration changes.
*/
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void updateTouchExplorationState() {
final CheckBoxPreference prefTouchExploration =
(CheckBoxPreference) findPreferenceByResId(R.string.pref_explore_by_touch_reflect_key);
if (prefTouchExploration == null) {
return;
}
final ContentResolver resolver = getContentResolver();
final Resources res = getResources();
final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
final boolean requestedState =
SharedPreferencesUtils.getBooleanPref(
prefs, res, R.string.pref_explore_by_touch_key, R.bool.pref_explore_by_touch_default);
final boolean reflectedState = prefTouchExploration.isChecked();
final boolean actualState;
// If accessibility is disabled then touch exploration is always
// disabled, so the "actual" state should just be the requested state.
if (MyAccessibilityService.isServiceActive()) {
actualState = isTouchExplorationEnabled(resolver);
} else {
actualState = requestedState;
}
// If touch exploration is actually off and we requested it on, the user
// must have declined the "Enable touch exploration" dialog. Update the
// requested value to reflect this.
if (requestedState != actualState) {
LogUtils.log(
this,
Log.DEBUG,
"Set touch exploration preference to reflect actual state %b",
actualState);
SharedPreferencesUtils.putBooleanPref(
prefs, res, R.string.pref_explore_by_touch_key, actualState);
}
// Ensure that the check box preference reflects the requested state,
// which was just synchronized to match the actual state.
if (reflectedState != actualState) {
prefTouchExploration.setChecked(actualState);
}
}