功能描述：Android7.1.2 设置下添加一级菜单[ZedielPcbTest]，点击ZedielPcbTest，启动ZedielPcbTest.apk应用。

此功能用到以下类：

packages/apps/Settings/AndroidManifest.xml
packages/apps/Settings/res/values/strings.xml
packages/apps/Settings/src/com/android/settings/Settings.java
packages/apps/Settings/src/com/android/settings/SettingsActivity.java
packages/apps/Settings/src/com/android/settings/ZedielPcbTest.java

功能实现

1.path:packages/apps/Settings/AndroidManifest.xml

<!--Add menu under Settings and open app by zfc 20190525 start-->

<activity android:name="Settings$ZedielPcbTestActivity"
　　android:label="@string/setting_zedielpcbtest"
　　android:icon="@drawable/ic_settings_display"
　　android:taskAffinity="">
　　<intent-filter>
　　　　<action android:name="android.intent.action.MAIN" />
　　　　<category android:name="android.intent.category.DEFAULT" />
　　</intent-filter>
　　<intent-filter android:priority="15">
　　　　<action android:name="com.android.settings.action.SETTINGS" />
　　</intent-filter>
　　<meta-data android:name="com.android.settings.category"
　　　　android:value="com.android.settings.category.device" />
　　<meta-data android:name="com.android.settings.FRAGMENT_CLASS"
　　　　android:value="com.android.settings.ZedielPcbTest" />
　　<meta-data android:name="com.android.settings.PRIMARY_PROFILE_CONTROLLED"
　　　　android:value="true" />
</activity>
<!--Add menu under Settings and open app by zfc 20190525 end-->

2.path:packages/apps/Settings/res/values/strings.xml

<string name="setting_zedielpcbtest">ZedielPcbTest</string>

3.path:packages/apps/Settings/src/com/android/settings/Settings.java

//Add menu under Settings and open app by zfc 20190525
public static class ZedielPcbTestActivity extends SettingsActivity { /* empty */ }

4.path:packages/apps/Settings/src/com/android/settings/SettingsActivity.java

// Show only these settings for restricted users
private String[] SETTINGS_FOR_RESTRICTED = {
　　//wireless_section
　　WifiSettingsActivity.class.getName(),
　　Settings.BluetoothSettingsActivity.class.getName(),
　　Settings.DataUsageSummaryActivity.class.getName(),
　　Settings.SimSettingsActivity.class.getName(),
　　Settings.WirelessSettingsActivity.class.getName(),
　　//device_section
　　Settings.HomeSettingsActivity.class.getName(),
　　Settings.SoundSettingsActivity.class.getName(),
　　Settings.DisplaySettingsActivity.class.getName(),
　　//Add menu under Settings and open app by zfc 20190525
　　Settings.ZedielPcbTestActivity.class.getName(),
};

private static final String[] ENTRY_FRAGMENTS = {
　　WirelessSettings.class.getName(),
　　WifiSettings.class.getName(),
　　AdvancedWifiSettings.class.getName(),
　　SavedAccessPointsWifiSettings.class.getName(),
　　//Add menu under Settings and open app by zfc 20190525
　　ZedielPcbTest.class.getName(),

}

5.packages/apps/Settings/src/com/android/settings/ZedielPcbTest.java

/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.android.settings;

import android.content.Context;
import android.os.Build;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceGroup;
import com.android.settings.search.Indexable;
import com.android.internal.logging.MetricsProto.MetricsEvent;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

public class ZedielPcbTest extends SettingsPreferenceFragment implements Indexable{

　　@Override
　　public void onCreate(Bundle icicle) {
　　　　super.onCreate(icicle);
　　　　Intent intent = new Intent();
　　　　ComponentName component = new ComponentName("com.zediel.pcbtest","com.zediel.pcbtest.ZedielTools");
　　　　intent.setComponent(component);
　　　　startActivity(intent);
　　　　finish();
　　}

　　@Override
　　protected int getMetricsCategory() {
　　　　return MetricsEvent.DEVICEINFO;
　　}

}