«

Android之framework修改底部导航栏NavigationBar动态显示和隐藏

时间：2024-3-2 17:17     作者：韩俊     分类： Android

大家都知道，Android从3.0版本开始就加入了NavigationBar，主要是为那些没有实体按键的设备提供虚拟按键，但是，它始终固定在底部，占用48dp的像素高度，尽管从android 4.4开始可以全透明，使用这一部分像素，但三个按钮始终悬浮在屏幕上，这对于有强迫症的朋友来说是无法忍受的。因此，本文的目的就是修改framework部分代码，可以动态隐藏和显示NavigationBar，同时又尽量不影响系统的正常。

主要思路：

在NavigationBar的布局左部加入一个Button(在SystemUI模块实现)，点击隐藏NavigationBar，即将NavigationBar从WindowManager中移除掉。需要的时候，通过一个从屏幕底部向上的滑动手势(在policy模块实现)调出NavigationBar。如下两图对比所示：一张为移除前，另一张为移除后。


具体实现：

①.增加按钮实现动态隐藏，主要修改在frameworks/base/packages/SystemUI模块，首先我们增加一个按钮，主要修改

frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml文件，图片资源和字符串我就不提了，具体如下：

diff --git a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
index 16027d9..326aafc 100644
--- a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
+++ b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
@@ -42,12 +42,28 @@
             >

             <!-- navigation controls -->
+           <!--BEGIN liweiping
             <View
                 android:layout_width="40dp"
                 android:layout_height="match_parent"
                 android:layout_weight="0"
                 android:visibility="invisible"
                 />
+           -->
+            <FrameLayout
+                android:layout_width="@dimen/navigation_extra_key_width"
+                android:layout_height="match_parent"
+                android:layout_weight="0" >
+                <ImageButton
+                    android:id="@+id/hide_bar_btn"
+                    android:layout_width="@dimen/navigation_extra_key_width"
+                    android:layout_height="match_parent"
+                    android:contentDescription="@string/accessibility_hide"
+                    android:src="@drawable/ic_sysbar_hide"
+                     />
+
+            </FrameLayout>
+           <!--END liweiping -->
             <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/back"
                 android:layout_width="@dimen/navigation_key_width"
                 android:layout_height="match_parent"
@@ -246,12 +262,28 @@
                 android:layout_weight="0"
                 android:contentDescription="@string/accessibility_back"
                 />
+           <!--BEGIN liweiping
             <View
                 android:layout_height="40dp"
                 android:layout_width="match_parent"
                 android:layout_weight="0"
                 android:visibility="invisible"
                 />
+           -->
+            <FrameLayout
+                android:layout_weight="0"
+                android:layout_width="match_parent"
+                android:layout_height="40dp" >
+
+                <ImageButton
+                    android:id="@+id/hide_bar_btn"
+                    android:layout_width="match_parent"
+                    android:layout_height="40dp"
+                    android:contentDescription="@string/accessibility_hide"
+                    android:src="@drawable/ic_sysbar_hide_land"
+                     />
+            </FrameLayout>
+           <!--END liweiping -->
         </LinearLayout>

         <!-- lights out layout to match exactly -->

接下来修改frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java，为按钮提供一个接口，具体如下：
diff --git a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
index 88e71e2..7545984 100644
--- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
+++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
@@ -45,6 +45,7 @@ import com.android.systemui.R;
 import com.android.systemui.statusbar.BaseStatusBar;
 import com.android.systemui.statusbar.DelegateViewHelper;
 import com.android.systemui.statusbar.policy.DeadZone;
+import com.android.systemui.statusbar.policy.KeyButtonRipple;
 import com.android.systemui.statusbar.policy.KeyButtonView;

 import java.io.FileDescriptor;
@@ -265,6 +266,13 @@ public class NavigationBarView extends LinearLayout {
     public View getImeSwitchButton() {
         return mCurrentView.findViewById(R.id.ime_switcher);
     }
+    //BEGIN liweiping
+    public View getHideBarButton() {
+       View view = mCurrentView.findViewById(R.id.hide_bar_btn);
+       view.setBackground(new KeyButtonRipple(getContext(), view));
+        return view;
+    }
+    //END liweiping

     private void getIcons(Resources res) {
         mBackIcon = res.getDrawable(R.drawable.ic_sysbar_back);
@@ -412,7 +420,6 @@ public class NavigationBarView extends LinearLayout {
         mCurrentView = mRotatedViews[Surface.ROTATION_0];

         getImeSwitchButton().setOnClickListener(mImeSwitcherClickListener);
-
         updateRTLOrder();
     }



最后便是在frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java实现点击事件了：
+    private final OnClickListener mHideBarClickListener = new OnClickListener() {
+        @Override
+        public void onClick(View view) {
+           Log.i("way", "mHideBarClickListener  onClick...");
+           removeNavigationBar();
+        }
+    };

+    private void removeNavigationBar() {
+        if (DEBUG) Log.d(TAG, "removeNavigationBar: about to remove " + mNavigationBarView);
+        if (mNavigationBarView == null) return;
+
+        mWindowManager.removeView(mNavigationBarView);
+        mNavigationBarView = null;
+    }



到此，隐藏NavigationBar告一段落了。


②.接下来便是显示NavigationBar，这个修改相对复杂一点。因为此时NavigationBar处于不可见状态，我们无法通过增加按钮的方式让其显示，但是我们知道，状态栏下拉通过手势向下滑动即可。因此很容易便想到通过手势从屏幕底部向上滑动来显示NavigationBar。我的想法是在policy模块中增加一个接口，通过frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java服务传递到状态栏中，从而触发显示NavigationBar事件。

也许大家会有疑问，为什么是在policy模块修改？其实我这只是一种解决方案，因为我知道

frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java 有现成的手势滑动接口。其实你也可以SystemUI中增加一个这样的事件，我们需要的就是这么一个触发事件。

PhoneWindowManager.java的修改主要是实现onSwipeFromBottom(竖屏时)和onSwipeFromRight(横屏时)两个接口，然后调用showNavigationBar，在showNavigationBar函数中，我们调用StatusBarManagerService服务中的showNavigationBar函数，具体如下：

diff --git a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
index bb53e12..907202d 100644
--- a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -1241,13 +1241,27 @@ public class PhoneWindowManager implements WindowManagerPolicy {
                     public void onSwipeFromBottom() {
                         if (mNavigationBar != null && mNavigationBarOnBottom) {
                             requestTransientBars(mNavigationBar);
+                            Log.i("way", "onSwipeFromBottom... mNavigationBar != null && mNavigationBarOnBottom");
                         }
+                        //BEGIN liweiping
+                        else{
+                           Log.i("way", "onSwipeFromBottom...");
+                           showNavigationBar();
+                        }
+                        //END liweiping
                     }
                     @Override
                     public void onSwipeFromRight() {
                         if (mNavigationBar != null && !mNavigationBarOnBottom) {
                             requestTransientBars(mNavigationBar);
+                            Log.i("way", "onSwipeFromRight... mNavigationBar != null && !mNavigationBarOnBottom");
+                        }
+                        //BEGIN liweiping
+                        else{
+                           Log.i("way", "onSwipeFromRight...");
+                           showNavigationBar();
                         }
+                        //END liweiping
                     }
                     @Override
                     public void onDebug() {
@@ -1293,7 +1307,24 @@ public class PhoneWindowManager implements WindowManagerPolicy {
             goingToSleep(WindowManagerPolicy.OFF_BECAUSE_OF_USER);
         }
     }
-
+    //BEGIN liweiping
+    private void showNavigationBar(){
+        mHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    IStatusBarService statusbar = getStatusBarService();
+                    if (statusbar != null) {
+                        statusbar.showNavigationBar();
+                    }
+                } catch (RemoteException e) {
+                    // re-acquire status bar service next time it is needed.
+                    mStatusBarService = null;
+                }
+            }
+        });
+    }
+    //END liweiping
     private void updateKeyAssignments() {
         final boolean hasMenu = (mDeviceHardwareKeys & KEY_MASK_MENU) != 0;
         final boolean hasHome = (mDeviceHardwareKeys & KEY_MASK_HOME) != 0;



这时事件传递到了StatusBarManagerService中，我们来看看StatusBarManagerService.java如何实现showNavigationBar：
diff --git a/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java b/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
index f85e2d9..3f75840 100644
--- a/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
@@ -366,6 +366,27 @@ public class StatusBarManagerService extends IStatusBarService.Stub {
                     "WindowManager.LayoutParams");
         }
     }
+    //BEGIN liweiping
+    @Override
+    public void showNavigationBar() {
+        enforceStatusBar();
+
+        android.util.Log.d("way", TAG + " showNavigationBar...");
+
+        synchronized(mLock) {
+            mHandler.post(new Runnable() {
+                    public void run() {
+                        if (mBar != null) {
+                            try {
+                                mBar.showNavigationBar();
+                            } catch (RemoteException ex) {
+                            }
+                        }
+                    }
+                });
+        }
+    }
+    //END liweiping

     private void updateUiVisibilityLocked(final int vis, final int mask) {
         if (mSystemUiVisibility != vis) {



从上述代码可以看出，StatusBarManagerService只是起到一个传递作用，将消息传递到StatusBar中，最终的实现是在SystemUI模块的frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java，如下所示：
diff --git a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
index 9db875f..4f24b6e 100644
--- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
+++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
@@ -56,6 +56,7 @@ public class CommandQueue extends IStatusBar.Stub {
     private static final int MSG_BUZZ_BEEP_BLINKED          = 15 << MSG_SHIFT;
     private static final int MSG_NOTIFICATION_LIGHT_OFF     = 16 << MSG_SHIFT;
     private static final int MSG_NOTIFICATION_LIGHT_PULSE   = 17 << MSG_SHIFT;
+    private static final int MSG_SHOW_NAVIGATIONBAR   = 18 << MSG_SHIFT;//ADD liweiping

     public static final int FLAG_EXCLUDE_NONE = 0;
     public static final int FLAG_EXCLUDE_SEARCH_PANEL = 1 << 0;
@@ -83,6 +84,7 @@ public class CommandQueue extends IStatusBar.Stub {
         public void animateCollapsePanels(int flags);
         public void animateExpandSettingsPanel();
         public void setSystemUiVisibility(int vis, int mask);
+        public void showNavigationBar();//ADD liweiping
         public void topAppWindowChanged(boolean visible);
         public void setImeWindowStatus(IBinder token, int vis, int backDisposition,
                 boolean showImeSwitcher);
@@ -154,6 +156,14 @@ public class CommandQueue extends IStatusBar.Stub {
             mHandler.obtainMessage(MSG_SET_SYSTEMUI_VISIBILITY, vis, mask, null).sendToTarget();
         }
     }
+    //BEGIN liweiping
+    public void showNavigationBar() {
+        synchronized (mList) {
+            mHandler.removeMessages(MSG_SHOW_NAVIGATIONBAR);
+            mHandler.sendEmptyMessage(MSG_SHOW_NAVIGATIONBAR);
+        }
+    }
+    //END liweiping

     public void topAppWindowChanged(boolean menuVisible) {
         synchronized (mList) {
@@ -283,6 +293,11 @@ public class CommandQueue extends IStatusBar.Stub {
                 case MSG_SET_SYSTEMUI_VISIBILITY:
                     mCallbacks.setSystemUiVisibility(msg.arg1, msg.arg2);
                     break;
+                //BEGIN liweiping
+                case MSG_SHOW_NAVIGATIONBAR:
+                   mCallbacks.showNavigationBar();
+                   break;
+                //END liweiping
                 case MSG_TOP_APP_WINDOW_CHANGED:
                     mCallbacks.topAppWindowChanged(msg.arg1 != 0);
                     break;



CommandQueue.java收到了这个消息之后，又回调给了base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java，绕了大半天，消息终于回来了，我们就是需要在PhoneStatusBar.java实现显示NavigationBar的函数了：

+    @Override // CommandQueue
+    public void showNavigationBar() {
+       Log.i("way", TAG + " showNavigationBar...");
+       forceAddNavigationBar();
+    }

+    private void forceAddNavigationBar() {
+        // If we have no Navbar view and we should have one, create it
+        if (mNavigationBarView != null) {
+            return;
+        }
+
+        mNavigationBarView =
+                (NavigationBarView) View.inflate(mContext, R.layout.navigation_bar, null);

+        mNavigationBarView.setDisabledFlags(mDisabled);
+        mNavigationBarView.setBar(this);
+        addNavigationBar(true); // dynamically adding nav bar, reset System UI visibility!
+    }

+    private void prepareNavigationBarView(boolean forceReset) {
+        mNavigationBarView.reorient();
+        mNavigationBarView.getRecentsButton().setOnClickListener(mRecentsClickListener);
+        mNavigationBarView.getRecentsButton().setOnTouchListener(mRecentsPreloadOnTouchListener);
+        mNavigationBarView.getRecentsButton().setLongClickable(true);
+        mNavigationBarView.getRecentsButton().setOnLongClickListener(mLongPressBackRecentsListener);
+        mNavigationBarView.getBackButton().setLongClickable(true);
+        mNavigationBarView.getBackButton().setOnLongClickListener(mLongPressBackRecentsListener);
+        mNavigationBarView.getHomeButton().setOnTouchListener(mHomeActionListener);
+        mNavigationBarView.getHideBarButton().setOnClickListener(mHideBarClickListener);//ADD liweiping
+
+        if (forceReset) {
+            // Nav Bar was added dynamically - we need to reset the mSystemUiVisibility and call
+            // setSystemUiVisibility so that mNavigationBarMode is set to the correct value
+           Log.i("way", "prepareNavigationBarView mNavigationBarMode = "+ mNavigationBarMode + " mSystemUiVisibility = " + mSystemUiVisibility + " mNavigationIconHints = " + mNavigationIconHints);
+           mNavigationBarMode = 0;
+           
+            int newVal = mSystemUiVisibility;
+            mSystemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE;
+            setSystemUiVisibility(newVal, /*SYSTEM_UI_VISIBILITY_MASK*/0xffffffff);
+            int hints = mNavigationIconHints;
+            mNavigationIconHints = 0;
+            setNavigationIconHints(hints);
+            topAppWindowChanged(mShowMenu);
+        }
+
+        updateSearchPanel();
+    }
+
+    // For small-screen devices (read: phones) that lack hardware navigation buttons
+    private void addNavigationBar(boolean forceReset) {
+        if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + mNavigationBarView);
+        if (mNavigationBarView == null) return;
+
+        prepareNavigationBarView(forceReset);
+
+        mWindowManager.addView(mNavigationBarView, getNavigationBarLayoutParams());
+    }
+    //END liweiping


需要注意的是：

①显示NavigationBar时，需要重新实例化一次NavigationBarView，我之前有试过移除NavigationBarView后未置空，下次添加时直接使用，会出现状态栏重启的情况，具体原因未知，log显示动画播放错误之类。

②重新添加NavigationBarView时需要恢复NavigationBarView之前的状态，比如说隐藏前时是透明的、显示输入法按钮、菜单键等等。

③本文是在Android5.0的代码上修改的，其他版本未验证。

④本文仅是提供一种思路，并非最优方案。

⑤转载请注明出处：http://blog.csdn.net/way_ping_li



标签: android

热门推荐

1 JAVA颜色代码RGB颜色代码
2 疯狂Android讲义(1a)-基于监听的事件处理-控制飞机移动
3 Android斩首行动接口预请求问题怎么解决
4 Android GBK与UTF-8
5 android 仿苹果pad左侧右滑退出界面
6 androidの监听EditView中的文本TextWatcher
7 activity 的启动模式 详细实验报告。。。
8 android 将整个布局设置为不可点击状态
9 ActivityManager: Warning: Activity not started, its current task has been brought to the front 的的问题
10 UIAutomator在AndroidStudio中的使用

日历

标签

hbase maven eclipse sybase PostgreSQL spring emcache oracle mongodb redis nginx golang java vue android ios mysql linux 微信小程序 css html php教程 javascript python php

搜索

最新文章

热门文章