<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.provision">
    ...
    <application>
        <activity
            android:name="DefaultActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen"
            android:excludeFromRecents="true">
            <intent-filter android:priority="1">
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.HOME" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.SETUP_WIZARD" />
            </intent-filter>
        </activity>
    </application>
</manifest>

 1、 <category android:name="android.intent.category.SETUP_WIZARD" />

可以运行在launcher之前的apk、

2、 接下来看下这个app除了显示引导界面，还要做什么

在最后，保存了设备开机引导的状态，

 private void finishSetupWizard() {
        // Add a persistent setting to allow other apps to know the device has been provisioned.
        Settings.Global.putInt(getContentResolver(), Settings.Global.DEVICE_PROVISIONED, 1);
        Settings.Secure.putInt(getContentResolver(), Settings.Secure.USER_SETUP_COMPLETE, 1);
        PackageManager pm = getPackageManager();
        if (pm.hasSystemFeature(PackageManager.FEATURE_LEANBACK) == true) {
            Settings.Secure.putInt(getContentResolver(), Settings.Secure.TV_USER_SETUP_COMPLETE, 1);
        }
        // remove this activity from the package manager.
        ComponentName name = new ComponentName(this, DefaultActivity.class);
        pm.setComponentEnabledSetting(name, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
        finish();
    }

3、android HOME键失效！

其实我们还可以发现，当导航app未设置完成时HOME键是不起作用的，原因就是状态控制了， Settings.Secure.USER_SETUP_COMPLETE

这样用户就不能够跳过第一次的开机设置了。

中的isUserSertupComplete（）函数其实就是对一些按键的响应添加了判断条件

    boolean isUserSetupComplete() {
        boolean isSetupComplete = Settings.Secure.getIntForUser(mContext.getContentResolver(),
                Settings.Secure.USER_SETUP_COMPLETE, 0, UserHandle.USER_CURRENT) != 0;
        if (mHasFeatureLeanback) {
            isSetupComplete &= isTvUserSetupComplete();
        }
        return isSetupComplete;
    }

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