Android11、12 动态禁用(隐藏)Home键

Leon_冲冲冲

已于 2024-07-08 09:01:11 修改

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分类专栏： Android系统文章标签： android java

于 2024-07-05 14:19:23 首次发布

本文链接：https://blog.youkuaiyun.com/qq_28391385/article/details/140197508

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@[TOC](Android11、12 动态禁用(隐藏)Home键)

概述

在实际开发中，导航栏的定制化开发比较常见，属于 SystemUI的修改常客。禁用Home键需求调用接口后隐藏Home键。

动态禁用Home键功能实现核心类

vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarFragment.java
vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarView.java

动态禁用Home键功能分析

在11、12的android系统中，导航栏的布局文件是NavigationBarView，而很显然，Home键的显示逻辑也在里面实现，实际上Home键是一个自定义的Button按钮。
home.xml

<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/home"
    android:layout_width="@dimen/navigation_key_width"
    android:layout_height="match_parent"
    android:layout_weight="0"
    systemui:keyCode="3"
    android:scaleType="center"
    android:contentDescription="@string/accessibility_home"
    android:paddingStart="@dimen/navigation_key_padding"
    android:paddingEnd="@dimen/navigation_key_padding"
    />

接下来看Home键在NavigationBarView中初始化

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
   
        super.onLayout(changed, left, top, right, bottom);

        mActiveRegion.setEmpty();
        updateButtonLocation(getBackButton(), mBackButtonBounds, true);
        updateButtonLocation(getHomeButton(), mHomeButtonBounds, false);
        updateButtonLocation(getRecentsButton(), mRecentsButtonBounds, false);
        updateButtonLocation(getRotateSuggestionButton(), mRotationButtonBounds, true);
        // TODO: Handle button visibility changes
        mOverviewProxyService.onActiveNavBarRegionChanges(mActiveRegion);
        mRecentsOnboarding.setNavBarHeight(getMeasuredHeight());
    }

...
    public ButtonDispatcher getHomeButton() {
   
        return mButtonDispatchers.get(R.id.home);
    }

绘制图标

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
   
        int w = MeasureSpec.getSize(widthMeasureSpec);
        int h = MeasureSpec.getSize(heightMeasureSpec);
        if (DEBUG) Log.d(TAG, String.format(
                "onMeasure: (%dx%d) old: (%dx%d)", w, h, getMeasuredWidth(), getMeasuredHeight()));

        final boolean newVertical = w > 0 && h > w
                && !isGesturalMode(mNavBarMode);
        if (newVertical != mIsVertical) {
   
            mIsVertical = newVertical;
            if (DEBUG) {
   
                Log.d(TAG, String.format("onMeasure: h=%d, w=%d, vert=%s", h, w,
                        mIsVertical ? "y" : "n"));
            }
            reorient();
            notifyVerticalChangedListener(newVertical