Source:
<code>private boolean processKeyUp(int keyCode) { <START> if (keyCode == KeyEvent.KEYCODE_ESCAPE ) { <END> dismiss(); return true; } else if (keyCode == KeyEvent.KEYCODE_TAB) { if (mInKbMode) { if (isTypedTimeFullyLegal()) { finishKbMode(true); } return true; } } else if (keyCode == KeyEvent.KEYCODE_ENTER) { if (mInKbMode) { if (!isTypedTimeFullyLegal()) { return true; } finishKbMode(false); } if (mCallback != null) { mCallback.onTimeSet(RadialTimePickerDialog.this, mTimePicker.getHours(), mTimePicker.getMinutes()); } dismiss(); return true; } else if (keyCode == KeyEvent.KEYCODE_DEL) { if (mInKbMode) { if (!mTypedTimes.isEmpty()) { int deleted = deleteLastTypedKey(); String deletedKeyStr; if (deleted == getAmOrPmKeyCode(AM)) { deletedKeyStr = mAmText; } else if (deleted == getAmOrPmKeyCode(PM)) { deletedKeyStr = mPmText; } else { deletedKeyStr = String.format("%d", getValFromKeyCode(deleted)); } Utils.tryAccessibilityAnnounce(mTimePicker, String.format(mDeletedKeyFormat, deletedKeyStr)); updateDisplay(true); } } } else if (keyCode == KeyEvent.KEYCODE_0 || keyCode == KeyEvent.KEYCODE_1 || keyCode == KeyEvent.KEYCODE_2 || keyCode == KeyEvent.KEYCODE_3 || keyCode == KeyEvent.KEYCODE_4 || keyCode == KeyEvent.KEYCODE_5 || keyCode == KeyEvent.KEYCODE_6 || keyCode == KeyEvent.KEYCODE_7 || keyCode == KeyEvent.KEYCODE_8 || keyCode == KeyEvent.KEYCODE_9 || (!mIs24HourMode && (keyCode == getAmOrPmKeyCode(AM) || keyCode == getAmOrPmKeyCode(PM)))) { if (!mInKbMode) { if (mTimePicker == null) { Log.e(TAG, "Unable to initiate keyboard mode, TimePicker was null."); return true; } mTypedTimes.clear(); tryStartingKbMode(keyCode); return true; } if (addKeyIfLegal(keyCode)) { updateDisplay(false); } return true; } return false; }</code><technical_language>remove KEYCODE_BACK check</technical_language>

Target:
private boolean processKeyUp(int keyCode) { if (keyCode == KeyEvent.KEYCODE_ESCAPE || keyCode == KeyEvent.KEYCODE_BACK) { dismiss(); return true; } else if (keyCode == KeyEvent.KEYCODE_TAB) { if (mInKbMode) { if (isTypedTimeFullyLegal()) { finishKbMode(true); } return true; } } else if (keyCode == KeyEvent.KEYCODE_ENTER) { if (mInKbMode) { if (!isTypedTimeFullyLegal()) { return true; } finishKbMode(false); } if (mCallback != null) { mCallback.onTimeSet(RadialTimePickerDialog.this, mTimePicker.getHours(), mTimePicker.getMinutes()); } dismiss(); return true; } else if (keyCode == KeyEvent.KEYCODE_DEL) { if (mInKbMode) { if (!mTypedTimes.isEmpty()) { int deleted = deleteLastTypedKey(); String deletedKeyStr; if (deleted == getAmOrPmKeyCode(AM)) { deletedKeyStr = mAmText; } else if (deleted == getAmOrPmKeyCode(PM)) { deletedKeyStr = mPmText; } else { deletedKeyStr = String.format("%d", getValFromKeyCode(deleted)); } Utils.tryAccessibilityAnnounce(mTimePicker, String.format(mDeletedKeyFormat, deletedKeyStr)); updateDisplay(true); } } } else if (keyCode == KeyEvent.KEYCODE_0 || keyCode == KeyEvent.KEYCODE_1 || keyCode == KeyEvent.KEYCODE_2 || keyCode == KeyEvent.KEYCODE_3 || keyCode == KeyEvent.KEYCODE_4 || keyCode == KeyEvent.KEYCODE_5 || keyCode == KeyEvent.KEYCODE_6 || keyCode == KeyEvent.KEYCODE_7 || keyCode == KeyEvent.KEYCODE_8 || keyCode == KeyEvent.KEYCODE_9 || (!mIs24HourMode && (keyCode == getAmOrPmKeyCode(AM) || keyCode == getAmOrPmKeyCode(PM)))) { if (!mInKbMode) { if (mTimePicker == null) { Log.e(TAG, "Unable to initiate keyboard mode, TimePicker was null."); return true; } mTypedTimes.clear(); tryStartingKbMode(keyCode); return true; } if (addKeyIfLegal(keyCode)) { updateDisplay(false); } return true; } return false; }