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| package com.example | |
| import android.util.Log; | |
| import android.view.KeyEvent; | |
| /** | |
| * Created by mat on 10/04/14. | |
| * | |
| * Allows a secret combination of volume up / volume down presses to trigger something. | |
| * I.E. reveal a hided debug menu when a combination is entered | |
| * In the example below 2431 would be triggered by pressing | |
| * down down, up up up up up, down down down, up | |
| * or | |
| * up up, down, down, down, down, up, up, up, down | |
| */ | |
| private VolumeCombination volumeCombination; | |
| // Create a new VolumeCombination with secret code and a listener for unlocking | |
| volumeCombination = new VolumeCombination("2431", new VolumeCombination.UnlockListener() { | |
| @Override | |
| public void onUnlock() { | |
| Toast.makeText(StartActivity.this, "Unlocked ^_^", Toast.LENGTH_SHORT).show(); | |
| } | |
| }); | |
| // Override onKeyDown in your activtiy or fragment and pass the event to | |
| @Override | |
| public boolean onKeyDown(int keyCode, KeyEvent event){ | |
| if (volumeCombination.checkVolumeCombination(keyCode, event)) return true; | |
| return super.onKeyDown(keyCode, event); | |
| } | |
| */ | |
| public class VolumeCombination { | |
| private static final long TIMEOUT_PREVIOUS_PRESS = 2000; | |
| public UnlockListener unlockListener; | |
| public String secretCode; | |
| public String currentAttempt = ""; | |
| public long prevPress = 0; | |
| public int curNo = 0; | |
| public int prevKey = -1; | |
| public VolumeCombination(String secretCode, UnlockListener unlockListener){ | |
| this.secretCode = secretCode; | |
| this.unlockListener = unlockListener; | |
| } | |
| interface UnlockListener{ | |
| public void onUnlock(); | |
| } | |
| public boolean checkVolumeCombination(int keyCode, KeyEvent keyEvent){ | |
| if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){ | |
| if (System.currentTimeMillis()-prevPress>TIMEOUT_PREVIOUS_PRESS){ | |
| // If user doesn't press a volume for a while, clear the attempt | |
| Log.i("VOLUME COMBINATION: ", "Timeout..."); | |
| curNo=0; | |
| prevKey=-1; | |
| currentAttempt=""; | |
| } | |
| if (prevKey==keyCode || prevKey==-1){ | |
| // If it's the same key add one to current letter of code | |
| curNo++; | |
| } | |
| else{ | |
| // If it's different move on to next letter | |
| currentAttempt += curNo; | |
| curNo=1; | |
| } | |
| Log.i("VOLUME COMBINATION: ", ""+currentAttempt+curNo); | |
| if (secretCode.equals(currentAttempt+curNo)){ | |
| unlockListener.onUnlock(); | |
| } | |
| // If our current string is too long, drop the start | |
| if (currentAttempt.length()==secretCode.length()) currentAttempt = currentAttempt.substring(1); | |
| prevKey = keyCode; | |
| prevPress = System.currentTimeMillis(); | |
| return true; | |
| } | |
| return false; | |
| } | |
| } |
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