本文基于Android5.1

packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java

    @Override    public void onResume() {        super.onResume();        if (mUnavailable) {            // Show error message            TextView emptyView = (TextView) getView().findViewById(android.R.id.empty);            getListView().setEmptyView(emptyView);            if (emptyView != null) {                emptyView.setText(R.string.development_settings_not_available);            }            return;        }        if (mDpm.getMaximumTimeToLock(null) > 0) {            // A DeviceAdmin has specified a maximum time until the device            // will lock...  in this case we can't allow the user to turn            // on "stay awake when plugged in" because that would defeat the            // restriction.            mDisabledPrefs.add(mKeepScreenOn);        } else {            mDisabledPrefs.remove(mKeepScreenOn);        }        final ContentResolver cr = getActivity().getContentResolver();        mLastEnabledState = Settings.Global.getInt(cr,                Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) != 0;        /// M: CR ALPS00327180. Lock and unlock screen, the switch is unchecked.        boolean isChecked = (mEnableDialog != null && mEnableDialog.isShowing()) ? true : mLastEnabledState;        mSwitchBar.setChecked(isChecked);        setPrefsEnabledState(mLastEnabledState);    //eng版本默认打开开发者模式        if (mHaveDebugSettings && !mLastEnabledState && "eng".equals(android.os.Build.TYPE)) {            // Overall debugging is disabled, but there are some debug            // settings that are enabled.  This is an invalid state.  Switch            // to debug settings being enabled, so the user knows there is            // stuff enabled and can turn it all off if they want.            Settings.Global.putInt(getActivity().getContentResolver(),                    Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 1);            mLastEnabledState = true;            mSwitchBar.setChecked(mLastEnabledState);            setPrefsEnabledState(mLastEnabledState);        }        mSwitchBar.show();        mExt.customUSBPreference(mEnableAdb);    }

Android修改user版本默认关闭开发者选项模式,eng版本默认打开开发者选项模式

本文基于Android5.1

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