Android 的导航栏有诸多功能,例入 截屏，音量加，音量减，最近任务，菜单．返回，主页面，输入法开关 ．．．．．．
代码源路径：frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarView.java
public ButtonDispatcher getScreenshotButton() {
return mButtonDispatchers.get(R.id.screenshot);
}
public ButtonDispatcher getVolumeAddButton() {
return mButtonDispatchers.get(R.id.volume_add);
}
public ButtonDispatcher getVolumeSubButton() {
return mButtonDispatchers.get(R.id.volume_sub);
}
public ButtonDispatcher getRecentsButton() {
return mButtonDispatchers.get(R.id.recent_apps);
}
public ButtonDispatcher getMenuButton() {
return mButtonDispatchers.get(R.id.menu);
}
public ButtonDispatcher getBackButton() {
return mButtonDispatchers.get(R.id.back);
}
public ButtonDispatcher getHomeButton() {
return mButtonDispatchers.get(R.id.home);
}
public ButtonDispatcher getImeSwitchButton() {
return mButtonDispatchers.get(R.id.ime_switcher);
}
public ButtonDispatcher getAccessibilityButton() {
return mButtonDispatchers.get(R.id.accessibility_button);
}Android 即在此类中完成对 Button图标 的选择 .
若需要展示/隐藏对应的 功能选项时，需要在此处修改：
private void prepareNavigationBarView() {
mNavigationBarView.reorient();
ButtonDispatcher recentsButton = mNavigationBarView.getRecentsButton();
recentsButton.setOnClickListener(this::onRecentsClick);
recentsButton.setOnTouchListener(this::onRecentsTouch);
recentsButton.setLongClickable(true);
recentsButton.setOnLongClickListener(this::onLongPressBackRecents);
ButtonDispatcher backButton = mNavigationBarView.getBackButton();
backButton.setLongClickable(true);
backButton.setOnLongClickListener(this::onLongPressBackRecents);
ButtonDispatcher homeButton = mNavigationBarView.getHomeButton();
homeButton.setOnTouchListener(this::onHomeTouch);
homeButton.setOnLongClickListener(this::onHomeLongClick);
ButtonDispatcher accessibilityButton = mNavigationBarView.getAccessibilityButton();
accessibilityButton.setOnClickListener(this::onAccessibilityClick);
accessibilityButton.setOnLongClickListener(this::onAccessibilityLongClick);
updateAccessibilityServicesState(mAccessibilityManager);
ButtonDispatcher screenshotButton = mNavigationBarView.getScreenshotButton();
screenshotButton.setOnClickListener(this:: screenshotClick);
screenshotButton.setOnTouchListener(this:: screenshotTouch);
boolean isShow=Settings.System.getInt(getContext().getContentResolver(), Settings.System.SCREENSHOT_BUTTON_SHOW, 1) == 1;
if(isShow){
screenshotButton.setVisibility(View.VISIBLE);
}else{
screenshotButton.setVisibility(View.GONE);
}
ButtonDispatcher volumeAddButton=mNavigationBarView.getVolumeAddButton();
ButtonDispatcher volumeSubButton=mNavigationBarView.getVolumeSubButton();
boolean isShowVolumeButton="true".equals(SystemProperties.get("ro.rk.systembar.voiceicon","true"));
if(isShowVolumeButton){
volumeAddButton.setVisibility(View.VISIBLE);
volumeSubButton.setVisibility(View.VISIBLE);
}else{
volumeAddButton.setVisibility(View.GONE);
volumeSubButton.setVisibility(View.GONE);
}
if (getContext().getResources().getConfiguration().smallestScreenWidthDp < 400) {
volumeAddButton.setVisibility(View.GONE);
volumeSubButton.setVisibility(View.GONE);
}
}可以将对应的Button 设置 setVisibility(View.GONE / View.INVISIBLE / View.VISIBLE);
当加上setVisibility时,UI界面还没显示时,需要注意config.xml中是否有写进去需要的Button .
frameworks\base\packages\SystemUI\res\values\config.xml
<string name="config_navBarLayout" translatable="false">left;volume_sub,back,home,recent,volume_add;right</string>需要注意的是,config中配置的顺序 即为 UI的显示顺序 .
提一嘴，如果需要用到屏蔽状态栏以及任务栏，可以将如下status_bar_height 的高度设为０.
frameworks\base\core\res\res\values\dimens.xml
<!-- Height of the status bar -->
<dimen name="status_bar_height">0dp</dimen>到此这篇关于Android导航栏功能项的显示与屏蔽介绍的文章就介绍到这了,更多相关Android导航栏内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
