android4.0系统可以运行于平板电脑和手机上面,这样对于状态栏来说,也是有不同风格的,从SystemUi的代码分类我就可以看出来,google考虑了不同情况下状态栏的显示等,
在源代码里面有这么两个文件夹需要注意:
com.android.systemui.statusbar.phone 这个是针对手机而需要的status bar
com.android.systemui.statusbar.tablet 这个是针对平板电脑而需要的status bar(system bar)
首先状态栏是如何启动起来的呢?
我们都知道系统刚启动,在SystemServer会加载系统的各种服务,状态栏也不例外,就是在这个时候创建的,代码如下:
路径:androidx86/framework/base/services/java/com/android/server/SystemServer.java
SystemServer.java
ActivityManagerService.self().systemReady(new Runnable() {
public void run() {
Slog.i(TAG, "Making services ready");
startSystemUi(contextF);
try {
if (batteryF != null) batteryF.systemReady();
} catch (Throwable e) {
reportWtf("making Battery Service ready", e);
}
static final void startSystemUi(Context context) {
Intent intent = new Intent();
intent.setComponent(new ComponentName("com.android.systemui",
"com.android.systemui.SystemUIService"));
Slog.d(TAG, "Starting service: " + intent);
context.startService(intent);
}
通过上面的代码我就看到系统启动了com.android.systemui.SystemUIService 这个服务,在这个服务里面就会启动状态栏,
但是这里就会有个选择,是启动status bar呢 还是启动 system bar呢,android是这么决定的:
路径:androidx86/framework/base/packages/SystemUI/SystemUI.java
public void onCreate() {
// Pick status bar or system bar.
IWindowManager wm = IWindowManager.Stub.asInterface(
ServiceManager.getService(Context.WINDOW_SERVICE));
try {
SERVICES[0] = wm.canStatusBarHide()(1)
? R.string.config_statusBarComponent(2)
: R.string.config_systemBarComponent;(3)
} catch (RemoteException e) {
Slog.w(TAG, "Failing checking whether status bar can hide", e);
}
final int N = SERVICES.length;
mServices = new SystemUI[N];
for (int i=0; i<N; i++) {
Class cl = chooseClass(SERVICES[i]);
Slog.d(TAG, "loading: " + cl);
try {
mServices[i] = (SystemUI)cl.newInstance();
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex);
} catch (InstantiationException ex) {
throw new RuntimeException(ex);
}
mServices[i].mContext = this;
Slog.d(TAG, "running: " + mServices[i]);
mServices[i].start();
}
}
该start方法在androidx86/framework/base/packages/SystemUI/statusbar/StatusBar.java
在start方法里面就会创建状态栏那些界面对应的各种view,包括下拉状态栏后的view等,把这些view都创建好以后,就把这个view加载windowmanager里面就可以了,这样状态栏就可以显示出来了,代码如下:
final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
height,
WindowManager.LayoutParams.TYPE_STATUS_BAR,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
| WindowManager.LayoutParams.FLAG_SPLIT_TOUCH,
PixelFormat.OPAQUE);
// the status bar should be in an overlay if possible
final Display defaultDisplay
= ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (ActivityManager.isHighEndGfx(defaultDisplay)) {
lp.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
}
lp.gravity = getStatusBarGravity();
lp.setTitle("StatusBar");
lp.packageName = mContext.getPackageName();
lp.windowAnimations = R.style.Animation_StatusBar;
WindowManagerImpl.getDefault().addView(sb, lp); //这里的sb就是状态栏view
因为我们要屏蔽状态栏,所以也就把这句话屏蔽了就可以了。
OK!!!问题解决!