Android:禁用后无法重新启用键盘锁

时间:2012-05-22 08:00:25

标签: android locking screen preferences keyguard

我正在尝试在我的应用中创建一个选项(使用复选框首选项),以便用户禁用并重新启用锁定屏幕。我使用disableKeyguard()来禁用锁定屏幕,它可以正常工作,但我无法让reenableKeyguard()工作。代码非常简单,我不知道它为什么不起作用。

public void onSharedPreferenceChanged(SharedPreferences taskprefs,
        String tasks_pref) {
    boolean skiplock = taskprefs.getBoolean("pref_skiplock", false);
    boolean screentimeout = taskprefs.getBoolean("pref_screentimeout",
            false);

    skiplock(skiplock);

    // Log.v("TaskActivity", "Skiplock value is " + skiplock);
    // Log.v("TaskActivity", "ScreenTimeout value is " + screentimeout);
}

private void skiplock(boolean action) {
    KeyguardManager keyguardManager = (KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE);
    KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
    //
    if (action == true) {
        lock.disableKeyguard();
        Toast.makeText(getApplicationContext(), "Lockscreen Disabled",
                Toast.LENGTH_SHORT).show();
    }
    //
    else if (action==false) {
        lock.reenableKeyguard();
        Toast.makeText(getApplicationContext(), "Lockscreen Enabled",
                Toast.LENGTH_SHORT).show();
    }
}

1 个答案:

答案 0 :(得分:4)

问题是每次调用skiplock()方法时都会创建(声明)一个新的Keyguard对象。一个简单的解决方案是将keyguard声明为全局对象并引用该单个对象,以便在方法完成执行时不会重置其状态。

简而言之,只需使用“KeguardLock lock”和“KeyguardManager keyguardManager”作为全局构造函数。