Android源码学习----状态栏（1）SignalClusterView

// Intimately tied to the design of res/layout/signal_cluster_view.xml public class SignalClusterView extends LinearLayout implements NetworkControllerImpl.SignalCallback, SecurityController.SecurityControllerCallback, Tunable, DarkReceiver { // Vpn wifi 飞行模式图标 private final NetworkController mNetworkController; private final SecurityController mSecurityController; //省略 private ArrayList<PhoneState> mPhoneStates = new ArrayList<PhoneState>(); //省略 ViewGroup mEthernetGroup, mWifiGroup; ImageView mVpn, mEthernet, mWifi, mAirplane, mEthernetDark, mWifiDark; ImageView mWifiActivityIn, mWifiActivityOut; View mWifiAirplaneSpacer, mWifiSignalSpacer; LinearLayout mMobileSignalGroup;

路径是 /frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/SignalClusterView.java

可以看出来是LineLayout的子类 ，里面重写了onLayout方法，onLayout调用了super.onLayout方法和applyIconTint()方法.

applyIconTint()方法里面就是对view的设置

private void applyIconTint() { setTint(mVpn, DarkIconDispatcher.getTint(mTintArea, mVpn, mIconTint)); //省略 applyDarkIntensity( DarkIconDispatcher.getDarkIntensity(mTintArea, mEthernet, mDarkIntensity), mEthernet, mEthernetDark); for (int i = 0; i < mPhoneStates.size(); i++) { mPhoneStates.get(i).setIconTint(mIconTint, mDarkIntensity, mTintArea); } } //设置透明度 private void applyDarkIntensity(float darkIntensity, View lightIcon, View darkIcon) { lightIcon.setAlpha(1 - darkIntensity); darkIcon.setAlpha(darkIntensity); } // 为图片设置渲染颜色. private void setTint(ImageView v, int tint) { v.setImageTintList(ColorStateList.valueOf(tint)); }

view的初始化：

@Override protected void onFinishInflate() { super.onFinishInflate(); //findview组件 mVpn = findViewById(R.id.vpn); mEthernetGroup = findViewById(R.id.ethernet_combo); mEthernet = findViewById(R.id.ethernet); //省略 maybeScaleVpnAndNoSimsIcons(); } /** * Extracts the icon off of the VPN and no sims views and maybe scale them by * {@link #mIconScaleFactor}. Note that the other icons are not scaled here because * they are dynamic. As such, they need to be scaled each time the icon changes in {@link #apply()}. */ private void maybeScaleVpnAndNoSimsIcons() { if (mIconScaleFactor == 1.f) { return; } mVpn.setImageDrawable(new ScalingDrawableWrapper(mVpn.getDrawable(), mIconScaleFactor)); }

maybeScaleVpnAndNoSimsIcons（）上面的注释是说：  从vpn中提取图标，不显示sims视图，并按比例缩放 {@link miconscalefactor}。请注意，其他图标在此不缩放，因为它们是动态的因此，每次在{@link apply（）中更改图标时，都需要缩放它们。

      apply() 是一个私有方法，上面有一个注释   // Run after each indicator change. 也就是 每次指标变化后运行，里面内容就是对一些View的设置，那么调用apply()的地方有

@Override public void setIsAirplaneMode(IconState icon) {//飞行模式 mIsAirplaneMode = icon.visible && !mBlockAirplane; mAirplaneIconId = icon.icon; mAirplaneContentDescription = icon.contentDescription; apply(); } @Override public void onRtlPropertiesChanged(int layoutDirection) { //省略 } @Override protected void onAttachedToWindow() {//连接到window super.onAttachedToWindow(); mVpnVisible = mSecurityController.isVpnEnabled(); mVpnIconId = currentVpnIconId(mSecurityController.isVpnBranded()); for (PhoneState state : mPhoneStates) { if (state.mMobileGroup.getParent() == null) { mMobileSignalGroup.addView(state.mMobileGroup); } } int endPadding = mMobileSignalGroup.getChildCount() > 0 ? mMobileSignalGroupEndPadding : 0; mMobileSignalGroup.setPaddingRelative(0, 0, endPadding, 0); Dependency.get(TunerService.class).addTunable(this, StatusBarIconController.ICON_BLACKLIST); apply(); applyIconTint(); mNetworkController.addCallback(this); mSecurityController.addCallback(this); } @Override public void setWifiIndicators(...) {//wifi } @Override public void setMobileDataIndicators(...); //信号等等数据 } @Override public void setEthernetIndicators(IconState state) {//设置以太网指示器 }

回到applyIconTint()方法，mPhoneStates是PhoneState的集合，源码里面PhoneState是内部类， 

public PhoneState(int subId, Context context) { ViewGroup root = (ViewGroup) LayoutInflater.from(context) .inflate(R.layout.mobile_signal_group, null); setViews(root); mSubId = subId; } public void setViews(ViewGroup root) { mMobileGroup = root; mMobile = root.findViewById(R.id.mobile_signal); mMobileType = root.findViewById(R.id.mobile_type); mMobileRoaming = root.findViewById(R.id.mobile_roaming); mMobileRoamingSpace = root.findViewById(R.id.mobile_roaming_space); mMobileActivityIn = root.findViewById(R.id.mobile_in); mMobileActivityOut = root.findViewById(R.id.mobile_out); mMobileSignalDrawable = new SignalDrawable(mMobile.getContext()); mMobile.setImageDrawable(mMobileSignalDrawable); }