Android Launcher 在底部导航栏添加一个“☰”按钮，点击弹出全部应用

相关文件
frameworks/base/packages/SystemUI/res/layout/all_app.xml
frameworks/base/packages/SystemUI/res/values-sw400dp/config.xml
frameworks/base/packages/SystemUI/res/values-sw600dp/config.xml
frameworks/base/packages/SystemUI/res/values-sw720dp/config.xml
frameworks/base/packages/SystemUI/res/values-sw900dp/config.xml
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarInflaterView.java
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
packages / apps/Launcher3/src/com/android/launcher3/Launcher.java

思路

• 1、 创建allApp布局
• 2、 控制导航键显示位置
• 3、 在Java代码中拿到它的xml资源文件
• 4、 在Java代码中设置allApp图标
• 5、 给allApp设置监听事件
• 6、 实现弹出全部应用

实现

• 第一步：创建allApp布局
  frameworks/base/packages/SystemUI/res/layout/all_app.xml

• 第二步：控制导航键显示位置
  frameworks/base/packages/SystemUI/res/values-sw400dp/config.xml
  frameworks/base/packages/SystemUI/res/values-sw600dp/config.xml
  frameworks/base/packages/SystemUI/res/values-sw720dp/config.xml
  frameworks/base/packages/SystemUI/res/values-sw900dp/config.xml

    
    all_app;back,home,recent;right

• 第三步：在Java代码中拿到它的xml资源文件
  frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarInflaterView.java

public static final String ALL_APP = "all_app";    //声明

private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {
        if (HOME.equals(button)) {
            v = inflater.inflate(R.layout.home, parent, false);
        } else if(ALL_APP.equals(button)) {
            v = inflater.inflate(R.layout.all_app, parent, false);  
        } else if (BACK.equals(button)) {
            v = inflater.inflate(R.layout.back, parent, false);
        } 
} 

• 第四步：在Java代码中设置allApp图标
  frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

  private KeyButtonDrawable mAllAppIcon;      

 public NavigationBarView(Context context, AttributeSet attrs) {
  
        mButtonDispatchers.put(R.id.all_app, new ButtonDispatcher(R.id.all_app));
        mButtonDispatchers.put(R.id.back, new ButtonDispatcher(R.id.back));
        mButtonDispatchers.put(R.id.home, new ButtonDispatcher(R.id.home));
}

    
    public ButtonDispatcher getAllAppButton() {
        return mButtonDispatchers.get(R.id.all_app);
    }

 private void updateIcons(Configuration oldConfig) {
        mVolumeSubIcon = getDrawable(R.drawable.ic_sysbar_volume_sub_button);
        mAllAppIcon = getDrawable(R.drawable.ic_menu);  
        mScreenshotIcon = getDrawable(R.drawable.ic_sysbar_capture_button);
}

    public void updateNavButtonIcons() {
        getVolumeSubButton().setImageDrawable(mVolumeSubIcon);
        getAllAppButton().setImageDrawable(mAllAppIcon);    
        getScreenshotButton().setImageDrawable(mScreenshotIcon);
}

• 第五步：给allApp设置监听事件
  frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

 private void prepareNavigationBarView() {
 	
        ButtonDispatcher allAppButton = mNavigationBarView.getAllAppButton();
        allAppButton.setOnClickListener(this:: allAppClick);
}

   
    private void allAppClick(View v) {
        Intent intent=new Intent("com.xxx.allApp");
        getContext().sendBroadcast(intent);
    }

• 第六步：实现弹出全部应用
  packages / apps/Launcher3/src/com/android/launcher3/Launcher.java

@Override
    protected void onCreate(Bundle savedInstanceState) {
        registerReceiver(myReceiver, new IntentFilter("com.xxx.allApp"));	//动态注册广播
  }

 @Override
    public void onDestroy() {
  		unregisterReceiver(mScreenOffReceiver);
        unregisterReceiver(myReceiver);	//取消广播
        mWorkspace.removeFolderListeners();
  }

         
    private final BroadcastReceiver myReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            getStateManager().goToState(ALL_APPS);
        }
    };

Launcher 开发系列：
Launcher 在底部导航栏添加一个“☰”按钮，点击弹出全部应用
Launcher 修改底部导航虚拟按键的位置
Launcher 隐藏和开启底部虚拟按键（动态更改）
Launcher 去掉全部应用界面的搜索框
Launcher 点击鼠标右键时，显示菜单栏
Launcher 自定义一个虚拟按键实现返回主页和打开全部应用两个功能