自定义Systemui(顶部，左侧和底部)

Systemui

顶部、底部和左侧显示固定的区域

SystemUI，顾名思义是系统为用户提供的系统级别的信息显示与交互的一套UI组件，所以其功能包罗万象。比如锁屏、状态栏、底部导航栏、最近使用App列表等，大部分功能相互独立，按需启动。在系统源码中，其位置为：frameworks/base/package/SystemUI。尽管从表现形式上看，SystemUI和普通的Android APP有较大的差别，但其本质和普通APP并没有什么差别，也是以apk的形式存在,会被预置再系统指定的目录

1.systemui启动时机

首先先说下android系统启动流程

1. 开启电源，执行BootLoader引导程序
2. BootLoader拉起并且执行Android操作系统
3. 启动Linux内核，加载系统文件init.rc
4. 操作系统启动init进程
5. init启动zygote进程（创建JVM、注册JNI）
6. zygote进程启动虚拟机，启动SystemService进程
7. SystemService启动AMS和WMS等各种服务
8. AMS里面启动Launcher

Systemui作为系统主要进程，则是在SystemService中启动的

SystemServer.java中关键代码如下

private void run() {
        ......
          // Start services.开启各种Service
    try {
        traceBeginAndSlog("StartServices");
        startBootstrapServices();
        startCoreServices();
        startOtherServices();
        SystemServerInitThreadPool.shutdown();
    } catch (Throwable ex) {
        throw ex;
    } finally {
        traceEnd();
    }

private void startOtherServices() {
  ......
    mActivityManagerService.systemReady(() -> {
        Slog.i(TAG, "Making services ready");
        traceBeginAndSlog("StartActivityManagerReadyPhase");
        ......
        try {
            startSystemUi(context, windowManagerF);
        } catch (Throwable e) {
            reportWtf("starting System UI", e);
        }
        ......
   }
}


static final void startSystemUi(Context context, WindowManagerService windowManager) {
    Intent intent = new Intent();
    //所以我们在做定制Systemui时,只需将包名和类名设置为如下即可
    intent.setComponent(new ComponentName("com.android.systemui",
                "com.android.systemui.SystemUIService"));
    intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);
    context.startServiceAsUser(intent, UserHandle.SYSTEM);
    windowManager.onSystemUiStarted();
}
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2.AndroidMainifest配置

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

android:persistent="true"
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3. SystemUIService中添加window窗口

public class SystemUIService extends BaseService {
	private WindowManager mWindowManager;
    private WindowManager.LayoutParams mLayoutParams;


    @Override
    public void onCreate() {
        super.onCreate();
        Log.d("youdianxiaoshuai", "onCreate())");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
    	//这里只是示例加了个顶部状态栏 不同的位置有不同的windowType可以根据自己需求添加
    	mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    	mLayoutParams = new WindowManager.LayoutParams();

        //顶部状态栏   顶部状态栏的windowType
        mLayoutParams.type = WindowManager.LayoutParams.TYPE_STATUS_BAR; // 设置window type

        // 使窗口支持透明度
        mLayoutParams.format = PixelFormat.TRANSPARENT;

        mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        mLayoutParams.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
        mLayoutParams.flags |= WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS;
        mLayoutParams.x = 0;// 以屏幕右上角为原点，设置x、y初始值
        mLayoutParams.y = 0;
        mLayoutParams.width = 1320;// 设置悬浮窗口长宽数据
        mLayoutParams.height = 56;

        mLayoutParams.gravity = Gravity.TOP | Gravity.RIGHT;
        mLayoutParams.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
        mLayoutParams.setTitle("StatusBar");
        mLayoutParams.packageName = mContext.getPackageName();
        
		//这里的view添加布局文件
		mWindowManager.addView(view, mLayoutParams);
        return super.onStartCommand(intent, flags, startId);

    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

}
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