下载地址：http://download.csdn.net/source/3479523

（代码中还包括：通知，开机启动。。。。）

（private KeyguardLock m_keyguardLock = null;）

    //andorid2.1版本：对屏幕的解锁
    //使屏幕不能进行锁定
private void UnlockedScreen() {
AcquireWakeLock(1000 * 5);
Log.i(TAG, "---------------UnlockedScreen-------------");

if (m_keyguardLock != null) {
m_keyguardLock.disableKeyguard();
}
else {
KeyguardManager mKeyguardManager = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
m_keyguardLock = mKeyguardManager.newKeyguardLock("");
}
}

//使屏幕可以进行锁定
private void LockScreen() {
AcquireWakeLock(1000 * 5);
Log.i(TAG, "---------------LockScreen-------------");


if (m_keyguardLock != null) {
m_keyguardLock.reenableKeyguard();
}
else {
KeyguardManager mKeyguardManager = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
m_keyguardLock = mKeyguardManager.newKeyguardLock("");
}
}