本文介绍了Android中实现沉浸式状态栏的方法，包括`StatusBarUtil`类的相关函数，如设置状态栏和导航栏的颜色、透明度以及是否显示。文章强调了面试时对这些知识点的熟悉程度是关键，提供了历年大厂面试题集和学习资源。
/**
-
Enable tinting of the system status bar.
-
If the platform is running Jelly Bean or earlier, or translucent system
-
UI modes have not been enabled in either the theme or via window flags,
-
then this method does nothing.
-
@param enabled True to enable tinting, false to disable it (default).
*/
public void setStatusBarTintEnabled(boolean enabled) {
mStatusBarTintEnabled = enabled;
if (mStatusBarAvailable) {
mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
-
Enable tinting of the system navigation bar.
-
If the platform does not have soft navigation keys, is running Jelly Bean
-
or earlier, or translucent system UI modes have not been enabled in either
-
the theme or via window flags, then this method does nothing.
-
@param enabled True to enable tinting, false to disable it (default).
*/
public void setNavigationBarTintEnabled(boolean enabled) {
mNavBarTintEnabled = enabled;
if (mNavBarAvailable) {
mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
-
Apply the specified color tint to all system UI bars.
-
@param color The color of the background tint.
*/
public void setTintColor(int color) {
setStatusBarTintColor(color);
setNavigationBarTintColor(color);
}
/**
-
Apply the specified drawable or color resource to all system UI bars.
-
@param res The identifier of the resource.
*/
public void setTintResource(int res) {
setStatusBarTintResource(res);
setNavigationBarTintResource(res);
}
/**
-
Apply the specified drawable to all system UI bars.
-
@param drawable The drawable to use as the background, or null to remove it.
*/
public void setTintDrawable(Drawable drawable) {
setStatusBarTintDrawable(drawable);
setNavigationBarTintDrawable(drawable);
}
/**
-
Apply the specified alpha to all system UI bars.
-
@param alpha The alpha to use
*/
public void setTintAlpha(float alpha) {
setStatusBarAlpha(alpha);
setNavigationBarAlpha(alpha);
}
/**
-
Apply the specified color tint to the system status bar.
-
@param color The color of the background tint.
*/
public void setStatusBarTintColor(int color) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundColor(color);
}
}
/**
-
Apply the specified drawable or color resource to the system status bar.
-
@param res The identifier of the resource.
*/
public void setStatusBarTintResource(int res) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundResource(res);
}
}
/**
-
Apply the specified drawable to the system status bar.
-
@param drawable The drawable to use as the background, or null to remove it.
*/
@SuppressWarnings(“deprecation”)
public void setStatusBarTintDrawable(Drawable drawable) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundDrawable(drawable);
}
}
/**
-
Apply the specified alpha to the system status bar.
-
@param alpha The alpha to use
*/
@TargetApi(11)
public void setStatusBarAlpha(float alpha) {
if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mStatusBarTintView.setAlpha(alpha);
}
}
/**
-
Apply the specified color tint to the system navigation bar.
-
@param color The color of the background tint.
*/
public void setNavigationBarTintColor(int color) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundColor(color);
}
}
/**
-
Apply the specified drawable or color resource to the system navigation bar.
-
@param res The identifier of the resource.
*/
public void setNavigationBarTintResource(int res) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundResource(res);
}
}
/**
-
Apply the specified drawable to the system navigation bar.
-
@param drawable The drawable to use as the background, or null to remove it.
*/
@SuppressWarnings(“deprecation”)
public void setNavigationBarTintDrawable(Drawable drawable) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundDrawable(drawable);
}
}
/**
-
Apply the specified alpha to the system navigation bar.
-
@param alpha The alpha to use
*/
@TargetApi(11)
public void setNavigationBarAlpha(float alpha) {
if (mNavBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mNavBarTintView.setAlpha(alpha);
}
}
/**
-
Get the system bar configuration.
-
@return The system bar configuration for the current device configuration.
*/
public SystemBarConfig getConfig() {
return mConfig;
}
/**
-
Is tinting enabled for the system status bar?
-
@return True if enabled, False otherwise.
*/
public boolean isStatusBarTintEnabled() {
return mStatusBarTintEnabled;
}
/**
-
Is tinting enabled for the system navigation bar?
-
@return True if enabled, False otherwise.
*/
public boolean isNavBarTintEnabled() {
return mNavBarTintEnabled;
}
private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
mStatusBarTintView = new View(context);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
params.gravity = Gravity.TOP;
if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
params.rightMargin = mConfig.getNavigationBarWidth();
}
mStatusBarTintView.setLayoutParams(params);
mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mStatusBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mStatusBarTintView);
}
private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
mNavBarTintView = new View(context);
LayoutParams params;
if (mConfig.isNavigationAtBottom()) {
params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
params.gravity = Gravity.BOTTOM;
} else {
params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
params.gravity = Gravity.RIGHT;
}
mNavBarTintView.setLayoutParams(params);
mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mNavBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mNavBarTintView);
}
/**
-
Class which describes system bar sizing and other characteristics for the current
-
device configuration.
*/
public static class SystemBarConfig {
private static final String STATUS_BAR_HEIGHT_RES_NAME = “status_bar_height”;
private static final String NAV_BAR_HEIGHT_RES_NAME = “navigation_bar_height”;
private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = “navigation_bar_height_landscape”;
private static final String NAV_BAR_WIDTH_RES_NAME = “navigation_bar_width”;
private static final String SHOW_NAV_BAR_RES_NAME = “config_showNavigationBar”;
private final boolean mTranslucentStatusBar;
private final boolean mTranslucentNavBar;
private final int mStatusBarHeight;
private final int mActionBarHeight;
private final boolean mHasNavigationBar;
private final int mNavigationBarHeight;
private final int mNavigationBarWidth;
private final boolean mInPortrait;
private final float mSmallestWidthDp;
private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {
Resources res = activity.getResources();
mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
mSmallestWidthDp = getSmallestWidthDp(activity);
mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
mActionBarHeight = getActionBarHeight(activity);
mNavigationBarHeight = getNavigationBarHeight(activity);
mNavigationBarWidth = getNavigationBarWidth(activity);
mHasNavigationBar = (mNavigationBarHeight > 0);
mTranslucentStatusBar = translucentStatusBar;
mTranslucentNavBar = traslucentNavBar;
}
@TargetApi(14)
private int getActionBarHeight(Context context) {
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
TypedValue tv = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
result = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
}
return result;
}
@TargetApi(14)
private int getNavigationBarHeight(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
String key;
if (mInPortrait) {
key = NAV_BAR_HEIGHT_RES_NAME;
} else {
key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
}
return getInternalDimensionSize(res, key);
}
}
return result;
}
@TargetApi(14)
private int getNavigationBarWidth(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
}
}
return result;
}
@TargetApi(14)
private boolean hasNavBar(Context context) {
Resources res = context.getResources();
int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, “bool”, “android”);
if (resourceId != 0) {
boolean hasNav = res.getBoolean(resourceId);
// check override flag (see static block)
if (“1”.equals(sNavBarOverride)) {
hasNav = false;
} else if (“0”.equals(sNavBarOverride)) {
hasNav = true;
}
return hasNav;
} else { // fallback
return !ViewConfiguration.get(context).hasPermanentMenuKey();
}
}
private int getInternalDimensionSize(Resources res, String key) {
int result = 0;
int resourceId = res.getIdentifier(key, “dimen”, “android”);
if (resourceId > 0) {
result = res.getDimensionPixelSize(resourceId);
}
return result;
}
@SuppressLint(“NewApi”)
private float getSmallestWidthDp(Activity activity) {
DisplayMetrics metrics = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
} else {
// TODO this is not correct, but we don’t really care pre-kitkat
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
}
float widthDp = metrics.widthPixels / metrics.density;
float heightDp = metrics.heightPixels / metrics.density;
return Math.min(widthDp, heightDp);
}
/**
-
Should a navigation bar appear at the bottom of the screen in the current
-
device configuration? A navigation bar may appear on the right side of
-
the screen in certain configurations.
-
@return True if navigation should appear at the bottom of the screen, False otherwise.
*/
public boolean isNavigationAtBottom() {
return (mSmallestWidthDp >= 600 || mInPortrait);
}
/**
-
Get the height of the system status bar.
-
@return The height of the status bar (in pixels).
*/
public int getStatusBarHeight() {
return mStatusBarHeight;
}
/**
-
Get the height of the action bar.
-
@return The height of the action bar (in pixels).
*/
public int getActionBarHeight() {
return mActionBarHeight;
}
/**
-
Does this device have a system navigation bar?
-
@return True if this device uses soft key navigation, False otherwise.
*/
public boolean hasNavigtionBar() {
return mHasNavigationBar;
}
/**
-
Get the height of the system navigation bar.
-
@return The height of the navigation bar (in pixels). If the device does not have
-
soft navigation keys, this will always return 0.
*/
public int getNavigationBarHeight() {
return mNavigationBarHeight;
}
/**
-
Get the width of the system navigation bar when it is placed vertically on the screen.
-
@return The width of the navigation bar (in pixels). If the device does not have
-
soft navigation keys, this will always return 0.
*/
public int getNavigationBarWidth() {
return mNavigationBarWidth;
}
/**
-
Get the layout inset for any system UI that appears at the top of the screen.
-
@param withActionBar True to include the height of the action bar, False otherwise.
-
@return The layout inset (in pixels).
*/
public int getPixelInsetTop(boolean withActionBar) {
return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);
}
/**
-
Get the layout inset for any system UI that appears at the bottom of the screen.
-
@return The layout inset (in pixels).
*/
public int getPixelInsetBottom() {
if (mTranslucentNavBar && isNavigationAtBottom()) {
return mNavigationBarHeight;
} else {
return 0;
}
}
/**
-
Get the layout inset for any system UI that appears at the right of the screen.
-
@return The layout inset (in pixels).
*/
public int getPixelInsetRight() {
if (mTranslucentNavBar && !isNavigationAtBottom()) {
return mNavigationBarWidth;
} else {
return 0;
}
}
}
}
StatusBarUtil.java
最后
其实Android开发的知识点就那么多，面试问来问去还是那么点东西。所以面试没有其他的诀窍，只看你对这些知识点准备的充分程度。so，出去面试时先看看自己复习到了哪个阶段就好。
下图是我进阶学习所积累的历年腾讯、头条、阿里、美团、字节跳动等公司2019-2021年的高频面试题，博主还把这些技术点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节
以上【历年大厂高级工程师面试题集】、【Android高级进阶教学视频】、【Android高级知识点学习PDF】皆无偿分享给大家。如有需要，点击**【Android架构视频+BATJ面试专题PDF+学习笔记】**即可免费获取。
UI that appears at the right of the screen.
-
@return The layout inset (in pixels).
*/
public int getPixelInsetRight() {
if (mTranslucentNavBar && !isNavigationAtBottom()) {
return mNavigationBarWidth;
} else {
return 0;
}
}
}
}
StatusBarUtil.java
最后
其实Android开发的知识点就那么多，面试问来问去还是那么点东西。所以面试没有其他的诀窍，只看你对这些知识点准备的充分程度。so，出去面试时先看看自己复习到了哪个阶段就好。
下图是我进阶学习所积累的历年腾讯、头条、阿里、美团、字节跳动等公司2019-2021年的高频面试题，博主还把这些技术点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节
[外链图片转存中…(img-NBG4H4oY-1646285254783)]
以上【历年大厂高级工程师面试题集】、【Android高级进阶教学视频】、【Android高级知识点学习PDF】皆无偿分享给大家。如有需要，点击**【Android架构视频+BATJ面试专题PDF+学习笔记】**即可免费获取。
整理不易，望各位看官老爷点个关注转发，谢谢！祝大家都能得到自己心仪工作。
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