需求： 導(dǎo)航欄添加截屏和電源鍵圖標(biāo)，控制截屏和用于設(shè)備重啟關(guān)機(jī)功能。設(shè)置中添加延時(shí)截屏和控制截屏圖標(biāo)顯示開關(guān)。

1. 導(dǎo)航欄添加圖標(biāo)

1.1 添加布局文件和圖標(biāo)icon

在layout目錄下添加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.KeyButtonView
    xmlns: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.KeyButtonView
    xmlns: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目錄下添加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">
  <path
      android: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">
  <path
      android: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 加載布局

• 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

// 獲取默認(rèn)布局資源配置,關(guān)系到下一步修改圖標(biāo)顯示位置順序
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 控制導(dǎo)航欄按鍵顯示位置

• 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>

這個(gè)根據(jù)設(shè)備的分辨率來修改，有可能需要修改其他目錄下的config，搜索config_navBarLayout

1.4 添加的按鍵設(shè)置圖標(biāo)

• 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 start
    mButtonDispatchers.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 start
	mScreenshotIcon = 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 start
	getScreenshotButton().setImageDrawable(mScreenshotIcon);
	getNavPowerButton().setImageDrawable(mNavPowerIcon);
	// end
	...
}

1.5 設(shè)置監(jiān)聽事件

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

import android.os.SystemClock; // add start

private static final long AUTODIM_TIMEOUT_MS = 2250;
// add start
private static final long SCREENSHOT_TIME_INTERVAL = 3000;
private long mLastClickScreenshotTime = 0;
// end

private void prepareNavigationBarView() {
     mNavigationBarView.reorient();
     ...
     // add start
     ButtonDispatcher 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 截屏和電源鍵功能實(shí)現(xiàn)

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

 @Override
 public void init(Context context, IWindowManager windowManager,
     WindowManagerFuncs windowManagerFuncs) {
     ...
     // add start
     // register for nav_power click broadcasts
     filter=new IntentFilter();
     filter.addAction("android.intent.action.NAV_POWER");
     context.registerReceiver(mNavPowerReceiver, filter);
     
     // register for screenshot broadcasts
     filter=new IntentFilter();
     filter.addAction("android.intent.action.SCREENSHOT");
     context.registerReceiver(mScreenshotReceiver, filter);
     // end
     ...
}

// add start
BroadcastReceiver mScreenshotReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        mHandler.post(mScreenshotRunnable);
    }
};

BroadcastReceiver mNavPowerReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        showGlobalActionsInternal();
    }
};
// end

底下的patch中有Settings中添加延時(shí)截屏和控制圖標(biāo)顯示開關(guān)的修改
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