android Setting中隐藏项实现原理与代码

 addPreferencesFromResource(R.xml.device_info_settings);

<!-- Device firmware version -->
<Preference android:key="firmware_version"
style="?android:preferenceInformationStyle"
android:title="@string/firmware_version"
android:summary="@string/device_info_default"/>

firmware_version

@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
if (preference.getKey().equals("firmware_version")) {
System.arraycopy(mHits, 1, mHits, 0, mHits.length-1);
mHits[mHits.length-1] = SystemClock.uptimeMillis();
if (mHits[0] >= (SystemClock.uptimeMillis()-500)) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setClassName("android",
com.android.internal.app.PlatLogoActivity.class.getName());
try {
startActivity(intent);
} catch (Exception e) {
}
}
}
return super.onPreferenceTreeClick(preferenceScreen, preference);
}