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

作者：小小林熬夜学编程 | 2024-03-11 13:26:18

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removenavigationbar

       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：

  1. diff --git a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
  2. index 16027d9..326aafc 100644
  3. --- a/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
  4. +++ b/frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml
  5. @@ -42,12 +42,28 @@
  6.              >
  7.  
  8.              <!-- navigation controls -->
  9. +           <!--BEGIN liweiping
  10.              <View
  11.                  android:layout_width="40dp"
  12.                  android:layout_height="match_parent"
  13.                  android:layout_weight="0"
  14.                  android:visibility="invisible"
  15.                  />
  16. +           -->
  17. +            <FrameLayout
  18. +                android:layout_width="@dimen/navigation_extra_key_width"
  19. +                android:layout_height="match_parent"
  20. +                android:layout_weight="0" >
  21. +                <ImageButton
  22. +                    android:id="@+id/hide_bar_btn"
  23. +                    android:layout_width="@dimen/navigation_extra_key_width"
  24. +                    android:layout_height="match_parent"
  25. +                    android:contentDescription="@string/accessibility_hide"
  26. +                    android:src="@drawable/ic_sysbar_hide"
  27. +                     />
  28. +
  29. +            </FrameLayout>
  30. +           <!--END liweiping -->
  31.              <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/back"
  32.                  android:layout_width="@dimen/navigation_key_width"
  33.                  android:layout_height="match_parent"
  34. @@ -246,12 +262,28 @@
  35.                  android:layout_weight="0"
  36.                  android:contentDescription="@string/accessibility_back"
  37.                  />
  38. +           <!--BEGIN liweiping
  39.              <View
  40.                  android:layout_height="40dp"
  41.                  android:layout_width="match_parent"
  42.                  android:layout_weight="0"
  43.                  android:visibility="invisible"
  44.                  />
  45. +           -->
  46. +            <FrameLayout
  47. +                android:layout_weight="0"
  48. +                android:layout_width="match_parent"
  49. +                android:layout_height="40dp" >
  50. +
  51. +                <ImageButton
  52. +                    android:id="@+id/hide_bar_btn"
  53. +                    android:layout_width="match_parent"
  54. +                    android:layout_height="40dp"
  55. +                    android:contentDescription="@string/accessibility_hide"
  56. +                    android:src="@drawable/ic_sysbar_hide_land"
  57. +                     />
  58. +            </FrameLayout>
  59. +           <!--END liweiping -->
  60.          </LinearLayout>
  61.  
  62.          <!-- 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： 

  1. 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
  2. index 88e71e2..7545984 100644
  3. --- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
  4. +++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
  5. @@ -45,6 +45,7 @@ import com.android.systemui.R;
  6.  import com.android.systemui.statusbar.BaseStatusBar;
  7.  import com.android.systemui.statusbar.DelegateViewHelper;
  8.  import com.android.systemui.statusbar.policy.DeadZone;
  9. +import com.android.systemui.statusbar.policy.KeyButtonRipple;
  10.  import com.android.systemui.statusbar.policy.KeyButtonView;
  11.  
  12.  import java.io.FileDescriptor;
  13. @@ -265,6 +266,13 @@ public class NavigationBarView extends LinearLayout {
  14.      public View getImeSwitchButton() {
  15.          return mCurrentView.findViewById(R.id.ime_switcher);
  16.      }
  17. +    //BEGIN liweiping
  18. +    public View getHideBarButton() {
  19. +       View view = mCurrentView.findViewById(R.id.hide_bar_btn);
  20. +       view.setBackground(new KeyButtonRipple(getContext(), view));
  21. +        return view;
  22. +    }
  23. +    //END liweiping
  24.  
  25.      private void getIcons(Resources res) {
  26.          mBackIcon = res.getDrawable(R.drawable.ic_sysbar_back);
  27. @@ -412,7 +420,6 @@ public class NavigationBarView extends LinearLayout {
  28.          mCurrentView = mRotatedViews[Surface.ROTATION_0];
  29.  
  30.          getImeSwitchButton().setOnClickListener(mImeSwitcherClickListener);
  31. -
  32.          updateRTLOrder();
  33.      }



最后便是在frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java实现点击事件了： 

  1. +    private final OnClickListener mHideBarClickListener = new OnClickListener() {
  2. +        @Override
  3. +        public void onClick(View view) {
  4. +           Log.i("way", "mHideBarClickListener  onClick...");
  5. +           removeNavigationBar();
  6. +        }
  7. +    };
  8.  
  9. +    private void removeNavigationBar() {
  10. +        if (DEBUG) Log.d(TAG, "removeNavigationBar: about to remove " + mNavigationBarView);
  11. +        if (mNavigationBarView == null) return;
  12. +
  13. +        mWindowManager.removeView(mNavigationBarView);
  14. +        mNavigationBarView = null;
  15. +    }



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：

  1. 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
  2. index bb53e12..907202d 100644
  3. --- a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
  4. +++ b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
  5. @@ -1241,13 +1241,27 @@ public class PhoneWindowManager implements WindowManagerPolicy {
  6.                      public void onSwipeFromBottom() {
  7.                          if (mNavigationBar != null && mNavigationBarOnBottom) {
  8.                              requestTransientBars(mNavigationBar);
  9. +                            Log.i("way", "onSwipeFromBottom... mNavigationBar != null && mNavigationBarOnBottom");
  10.                          }
  11. +                        //BEGIN liweiping
  12. +                        else{
  13. +                           Log.i("way", "onSwipeFromBottom...");
  14. +                           showNavigationBar();
  15. +                        }
  16. +                        //END liweiping
  17.                      }
  18.                      @Override
  19.                      public void onSwipeFromRight() {
  20.                          if (mNavigationBar != null && !mNavigationBarOnBottom) {
  21.                              requestTransientBars(mNavigationBar);
  22. +                            Log.i("way", "onSwipeFromRight... mNavigationBar != null && !mNavigationBarOnBottom");
  23. +                        }
  24. +                        //BEGIN liweiping
  25. +                        else{
  26. +                           Log.i("way", "onSwipeFromRight...");
  27. +                           showNavigationBar();
  28.                          }
  29. +                        //END liweiping
  30.                      }
  31.                      @Override
  32.                      public void onDebug() {
  33. @@ -1293,7 +1307,24 @@ public class PhoneWindowManager implements WindowManagerPolicy {
  34.              goingToSleep(WindowManagerPolicy.OFF_BECAUSE_OF_USER);
  35.          }
  36.      }
  37. -
  38. +    //BEGIN liweiping
  39. +    private void showNavigationBar(){
  40. +        mHandler.post(new Runnable() {
  41. +            @Override
  42. +            public void run() {
  43. +                try {
  44. +                    IStatusBarService statusbar = getStatusBarService();
  45. +                    if (statusbar != null) {
  46. +                        statusbar.showNavigationBar();
  47. +                    }
  48. +                } catch (RemoteException e) {
  49. +                    // re-acquire status bar service next time it is needed.
  50. +                    mStatusBarService = null;
  51. +                }
  52. +            }
  53. +        });
  54. +    }
  55. +    //END liweiping
  56.      private void updateKeyAssignments() {
  57.          final boolean hasMenu = (mDeviceHardwareKeys & KEY_MASK_MENU) != 0;
  58.          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： 

  1. 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
  2. index f85e2d9..3f75840 100644
  3. --- a/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
  4. +++ b/frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
  5. @@ -366,6 +366,27 @@ public class StatusBarManagerService extends IStatusBarService.Stub {
  6.                      "WindowManager.LayoutParams");
  7.          }
  8.      }
  9. +    //BEGIN liweiping
  10. +    @Override
  11. +    public void showNavigationBar() {
  12. +        enforceStatusBar();
  13. +
  14. +        android.util.Log.d("way", TAG + " showNavigationBar...");
  15. +
  16. +        synchronized(mLock) {
  17. +            mHandler.post(new Runnable() {
  18. +                    public void run() {
  19. +                        if (mBar != null) {
  20. +                            try {
  21. +                                mBar.showNavigationBar();
  22. +                            } catch (RemoteException ex) {
  23. +                            }
  24. +                        }
  25. +                    }
  26. +                });
  27. +        }
  28. +    }
  29. +    //END liweiping
  30.  
  31.      private void updateUiVisibilityLocked(final int vis, final int mask) {
  32.          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： 

  1. 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
  2. index 9db875f..4f24b6e 100644
  3. --- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
  4. +++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
  5. @@ -56,6 +56,7 @@ public class CommandQueue extends IStatusBar.Stub {
  6.      private static final int MSG_BUZZ_BEEP_BLINKED          = 15 << MSG_SHIFT;
  7.      private static final int MSG_NOTIFICATION_LIGHT_OFF     = 16 << MSG_SHIFT;
  8.      private static final int MSG_NOTIFICATION_LIGHT_PULSE   = 17 << MSG_SHIFT;
  9. +    private static final int MSG_SHOW_NAVIGATIONBAR   = 18 << MSG_SHIFT;//ADD liweiping
  10.  
  11.      public static final int FLAG_EXCLUDE_NONE = 0;
  12.      public static final int FLAG_EXCLUDE_SEARCH_PANEL = 1 << 0;
  13. @@ -83,6 +84,7 @@ public class CommandQueue extends IStatusBar.Stub {
  14.          public void animateCollapsePanels(int flags);
  15.          public void animateExpandSettingsPanel();
  16.          public void setSystemUiVisibility(int vis, int mask);
  17. +        public void showNavigationBar();//ADD liweiping
  18.          public void topAppWindowChanged(boolean visible);
  19.          public void setImeWindowStatus(IBinder token, int vis, int backDisposition,
  20.                  boolean showImeSwitcher);
  21. @@ -154,6 +156,14 @@ public class CommandQueue extends IStatusBar.Stub {
  22.              mHandler.obtainMessage(MSG_SET_SYSTEMUI_VISIBILITY, vis, mask, null).sendToTarget();
  23.          }
  24.      }
  25. +    //BEGIN liweiping
  26. +    public void showNavigationBar() {
  27. +        synchronized (mList) {
  28. +            mHandler.removeMessages(MSG_SHOW_NAVIGATIONBAR);
  29. +            mHandler.sendEmptyMessage(MSG_SHOW_NAVIGATIONBAR);
  30. +        }
  31. +    }
  32. +    //END liweiping
  33.  
  34.      public void topAppWindowChanged(boolean menuVisible) {
  35.          synchronized (mList) {
  36. @@ -283,6 +293,11 @@ public class CommandQueue extends IStatusBar.Stub {
  37.                  case MSG_SET_SYSTEMUI_VISIBILITY:
  38.                      mCallbacks.setSystemUiVisibility(msg.arg1, msg.arg2);
  39.                      break;
  40. +                //BEGIN liweiping
  41. +                case MSG_SHOW_NAVIGATIONBAR:
  42. +                   mCallbacks.showNavigationBar();
  43. +                   break;
  44. +                //END liweiping
  45.                  case MSG_TOP_APP_WINDOW_CHANGED:
  46.                      mCallbacks.topAppWindowChanged(msg.arg1 != 0);
  47.                      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：

  1. +    @Override // CommandQueue
  2. +    public void showNavigationBar() {
  3. +       Log.i("way", TAG + " showNavigationBar...");
  4. +       forceAddNavigationBar();
  5. +    }
  6.  
  7. +    private void forceAddNavigationBar() {
  8. +        // If we have no Navbar view and we should have one, create it
  9. +        if (mNavigationBarView != null) {
  10. +            return;
  11. +        }
  12. +
  13. +        mNavigationBarView =
  14. +                (NavigationBarView) View.inflate(mContext, R.layout.navigation_bar, null);
  15.  
  16. +        mNavigationBarView.setDisabledFlags(mDisabled);
  17. +        mNavigationBarView.setBar(this);
  18. +        addNavigationBar(true); // dynamically adding nav bar, reset System UI visibility!
  19. +    }
  20.  
  21. +    private void prepareNavigationBarView(boolean forceReset) {
  22. +        mNavigationBarView.reorient();
  23. +        mNavigationBarView.getRecentsButton().setOnClickListener(mRecentsClickListener);
  24. +        mNavigationBarView.getRecentsButton().setOnTouchListener(mRecentsPreloadOnTouchListener);
  25. +        mNavigationBarView.getRecentsButton().setLongClickable(true);
  26. +        mNavigationBarView.getRecentsButton().setOnLongClickListener(mLongPressBackRecentsListener);
  27. +        mNavigationBarView.getBackButton().setLongClickable(true);
  28. +        mNavigationBarView.getBackButton().setOnLongClickListener(mLongPressBackRecentsListener);
  29. +        mNavigationBarView.getHomeButton().setOnTouchListener(mHomeActionListener);
  30. +        mNavigationBarView.getHideBarButton().setOnClickListener(mHideBarClickListener);//ADD liweiping
  31. +
  32. +        if (forceReset) {
  33. +            // Nav Bar was added dynamically - we need to reset the mSystemUiVisibility and call
  34. +            // setSystemUiVisibility so that mNavigationBarMode is set to the correct value
  35. +           Log.i("way", "prepareNavigationBarView mNavigationBarMode = "+ mNavigationBarMode + " mSystemUiVisibility = " + mSystemUiVisibility + " mNavigationIconHints = " + mNavigationIconHints);
  36. +           mNavigationBarMode = 0;
  37. +           
  38. +            int newVal = mSystemUiVisibility;
  39. +            mSystemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE;
  40. +            setSystemUiVisibility(newVal, /*SYSTEM_UI_VISIBILITY_MASK*/0xffffffff);
  41. +            int hints = mNavigationIconHints;
  42. +            mNavigationIconHints = 0;
  43. +            setNavigationIconHints(hints);
  44. +            topAppWindowChanged(mShowMenu);
  45. +        }
  46. +
  47. +        updateSearchPanel();
  48. +    }
  49. +
  50. +    // For small-screen devices (read: phones) that lack hardware navigation buttons
  51. +    private void addNavigationBar(boolean forceReset) {
  52. +        if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + mNavigationBarView);
  53. +        if (mNavigationBarView == null) return;
  54. +
  55. +        prepareNavigationBarView(forceReset);
  56. +
  57. +        mWindowManager.addView(mNavigationBarView, getNavigationBarLayoutParams());
  58. +    }
  59. +    //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



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