Android11.0 导航栏添加图标截屏-编程知识

需求： 导航栏添加截屏和电源键图标，控制截屏和用于设备重启关机功能。设置中添加延时截屏和控制截屏图标显示开关。
在这里插入图片描述

1. 导航栏添加图标

1.1 添加布局文件和图标icon

在layout目录下添加nav_power.xml和screenshot.xml文件

frameworks/base/packages/SystemUI/res/layout/nav_power.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.policy.KeyButtonViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/nav_power"android:layout_width="@dimen/navigation_key_width"android:layout_height="match_parent"android:layout_weight="0"android:scaleType="center"android:contentDescription="@string/accessibility_home"android:paddingStart="@dimen/navigation_key_padding"android:paddingEnd="@dimen/navigation_key_padding"/>

frameworks/base/packages/SystemUI/res/layout/screenshot.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.policy.KeyButtonViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/screenshot"android:layout_width="@dimen/navigation_key_width"android:layout_height="match_parent"android:layout_weight="0"systemui:keyCode="0"android:scaleType="center"android:contentDescription="@string/accessibility_home"android:paddingStart="@dimen/navigation_key_padding"android:paddingEnd="@dimen/navigation_key_padding"/>

drawable目录下添加ic_sysbar_power_button.xml和ic_sysbar_screenshot_button.xml

frameworks/base/packages/SystemUI/res/drawable/ic_sysbar_power_button.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"android:width="24dp"android:height="24dp"android:viewportWidth="24"android:viewportHeight="24"><pathandroid:fillColor="?attr/singleToneColor"android:pathData="M11,2h2v10h-2zM18.37,5.64l-1.41,1.41c2.73,2.73 2.72,7.16 -0.01,9.89 -2.73,2.73 -7.17,2.73 -9.89,0.01 -2.73,-2.73 -2.74,-7.18 -0.01,-9.91l-1.41,-1.4c-3.51,3.51 -3.51,9.21 0.01,12.73 3.51,3.51 9.21,3.51 12.72,-0.01 3.51,-3.51 3.51,-9.2 0,-12.72z"/>
</vector>

frameworks/base/packages/SystemUI/res/drawable/ic_sysbar_screenshot_button.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"android:width="24dp"android:height="24dp"android:viewportWidth="24"android:viewportHeight="24"><pathandroid:fillColor="?attr/singleToneColor"android:pathData="M17,1.01L7,1c-1.1,0 -2,0.9 -2,2v18c0,1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2L19,3c0,-1.1 -0.9,-1.99 -2,-1.99zM17,21L7,21v-1h10v1zM17,18L7,18L7,6h10v12zM17,4L7,4L7,3h10v1zM9.5,8.5L12,8.5L12,7L8,7v4h1.5zM12,17h4v-4h-1.5v2.5L12,15.5z"/>
</vector>

1.2 加载布局

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarInflaterView.java

public static final String HOME = "home";
// add start
public static final String SCREENSHOT = "screenshot";
public static final String NAV_POWER = "nav_power";
// end// 获取默认布局资源配置,关系到下一步修改图标显示位置顺序
protected String getDefaultLayout() {final int defaultResource = QuickStepContract.isGesturalMode(mNavBarMode)? R.string.config_navBarLayoutHandle: mOverviewProxyService.shouldShowSwipeUpUI()? R.string.config_navBarLayoutQuickstep: R.string.config_navBarLayout;return getContext().getString(defaultResource);
}...private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {View v = null;...if (HOME.equals(button)) {v = inflater.inflate(R.layout.home, parent, false);// add start} else if (SCREENSHOT.equals(button)) {v = inflater.inflate(R.layout.screenshot, parent, false);} else if (NAV_POWER.equals(button)) {v = inflater.inflate(R.layout.nav_power, parent, false);}// end

1.3 控制导航栏按键显示位置

frameworks/base/packages/SystemUI/res/values-sw372dp/config.xml

<string name="config_navBarLayout" translatable="false">left[.25W],screenshot[.5WC],back[.5WC];home;recent[.5WC],nav_power[.5WC],right[.25W]</string>

这个根据设备的分辨率来修改，有可能需要修改其他目录下的config，搜索config_navBarLayout

1.4 添加的按键设置图标

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

private KeyButtonDrawable mBackIcon;
private KeyButtonDrawable mHomeDefaultIcon;
// add start
private KeyButtonDrawable mScreenshotIcon;
private KeyButtonDrawable mNavPowerIcon;
// end ...public NavigationBarView(Context context, AttributeSet attrs) {super(context, attrs);...mButtonDispatchers.put(R.id.home, new ButtonDispatcher(R.id.home));// add startmButtonDispatchers.put(R.id.screenshot, new ButtonDispatcher(R.id.screenshot));mButtonDispatchers.put(R.id.nav_power, new ButtonDispatcher(R.id.nav_power));// end ...
}// add start
public ButtonDispatcher getScreenshotButton() {return mButtonDispatchers.get(R.id.screenshot);
}public ButtonDispatcher getNavPowerButton() {return mButtonDispatchers.get(R.id.nav_power);
}
// end...private void updateIcons(Configuration oldConfig) {...if (orientationChange || densityChange || dirChange) {mBackIcon = getBackDrawable();}// add startmScreenshotIcon = getDrawable(R.drawable.ic_sysbar_screenshot_button);mNavPowerIcon = getDrawable(R.drawable.ic_sysbar_power_button);// end
}...public void updateNavButtonIcons() {...getHomeButton().setImageDrawable(homeIcon);getBackButton().setImageDrawable(backIcon);// add startgetScreenshotButton().setImageDrawable(mScreenshotIcon);getNavPowerButton().setImageDrawable(mNavPowerIcon);// end...
}

1.5 设置监听事件

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

import android.os.SystemClock; // add startprivate static final long AUTODIM_TIMEOUT_MS = 2250;
// add start
private static final long SCREENSHOT_TIME_INTERVAL = 3000;
private long mLastClickScreenshotTime = 0;
// endprivate void prepareNavigationBarView() {mNavigationBarView.reorient();...// add startButtonDispatcher screenshotButton = mNavigationBarView.getScreenshotButton();screenshotButton.setOnClickListener(this:: screenshotClick);screenshotButton.setVisibility(View.VISIBLE);ButtonDispatcher navPowerButton = mNavigationBarView.getNavPowerButton();navPowerButton.setOnClickListener(this:: navPowerClick);navPowerButton.setVisibility(View.VISIBLE);// end
}...// add start
private void navPowerClick(View v) {Intent intent=new Intent("android.intent.action.NAV_POWER");getContext().sendBroadcast(intent);
}private void screenshotClick(View v) {long nowTime = SystemClock.elapsedRealtime();if (nowTime - mLastClickScreenshotTime < SCREENSHOT_TIME_INTERVAL) {return;}Intent intent=new Intent("android.intent.action.SCREENSHOT");getContext().sendBroadcast(intent);mLastClickScreenshotTime = nowTime;
}
// end

1.6 截屏和电源键功能实现

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

 @Overridepublic void init(Context context, IWindowManager windowManager,WindowManagerFuncs windowManagerFuncs) {...// add start// register for nav_power click broadcastsfilter=new IntentFilter();filter.addAction("android.intent.action.NAV_POWER");context.registerReceiver(mNavPowerReceiver, filter);// register for screenshot broadcastsfilter=new IntentFilter();filter.addAction("android.intent.action.SCREENSHOT");context.registerReceiver(mScreenshotReceiver, filter);// end...
}// add start
BroadcastReceiver mScreenshotReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {mHandler.post(mScreenshotRunnable);}
};BroadcastReceiver mNavPowerReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {showGlobalActionsInternal();}
};
// end