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Devmax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Devmax！