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Thursday, February 3, 2011

Screen ON And Unlock keypad

Screen ON: Required when activity is in foreground and performing long running task
Use below code snippet And add "android.permission.WAKE_LOCK" in app manifest

PowerManager powermgr = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakelock = powermgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");
// call long running task

Unlock keypad: Required when using intents. example: Making a phone call with user activity and after completing phone call user acitivity shall not be held with a keylock

Use below code snippet inside Onresume() method of the activity. And add "android.permission.DISABLE_KEYGUARD" in app manifest
public void checkKeypadLock()
KeyguardManager Keylockmgr = (KeyguardManager)getSystemService(KEYGUARD_SERVICE);
Keylockmgr.newKeyguardLock("My Tag").disableKeyguard();

Complete Usage of Disabling and Reenabling keyguard on Android

if (mKeyguardManager == null) {
mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
mKeyguardLock1 = mKeyguardManager.newKeyguardLock("QApp");
mKeyguardEnabled = true;

PowerManager powermgr = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakelock = powermgr.newWakeLock(PowerManager.FULL_WAKE_LOCK| PowerManager.ON_AFTER_RELEASE| PowerManager.ACQUIRE_CAUSES_WAKEUP,"QApp");


if (mKeyguardEnabled) {

if(mProductID == 1)
retval = mCalculator.Calc(mcalcJob,isOnline);
else if(mProductID == 2)
retval = m_pCalculator.Calc(mcalcJob,isOnline);


// ON sony ericsson the keylock is very quick, so we wait for 3Sec before reenabling keyguard only on Xperia 10i
try {
} catch (InterruptedException e) {
// TODO Auto-generated catch block


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