編輯：關於Android編程
大家都知道，Android從3.0版本開始就加入了NavigationBar，主要是為那些沒有實體按鍵的設備提供虛擬按鍵，但是，它始終固定在底部，占用48dp的像素高度，盡管從android 4.4開始可以全透明，使用這一部分像素，但三個按鈕始終懸浮在屏幕上，這對於有強迫症的朋友來說是無法忍受的。因此，本文的目的就是修改framework部分代碼，可以動態隱藏和顯示NavigationBar，同時又盡量不影響系統的正常。
主要思路：
在NavigationBar的布局左部加入一個Button(在SystemUI模塊實現)，點擊隱藏NavigationBar，即將NavigationBar從WindowManager中移除掉。需要的時候，通過一個從屏幕底部向上的滑動手勢(在policy模塊實現)調出NavigationBar。如下兩圖對比所示：一張為移除前，另一張為移除後。
具體實現：
①.增加按鈕實現動態隱藏，主要修改在frameworks/base/packages/SystemUI模塊，首先我們增加一個按鈕，主要修改
frameworks/base/packages/SystemUI/res/layout/navigation_bar.xml文件，圖片資源和字符串我就不提了，具體如下：
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 @@
>
+
+ <framelayout android:layout_height="match_parent" android:layout_weight="0" android:layout_width="@dimen/navigation_extra_key_width">
+
+
+ </framelayout>
+
+
+ <framelayout android:layout_height="40dp" android:layout_weight="0" android:layout_width="match_parent">
+
+
+ </framelayout>
+
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();
}
+ 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;
+ }
②.接下來便是顯示NavigationBar，這個修改相對復雜一點。因為此時NavigationBar處於不可見狀態，我們無法通過增加按鈕的方式讓其顯示，但是我們知道，狀態欄下拉通過手勢向下滑動即可。因此很容易便想到通過手勢從屏幕底部向上滑動來顯示NavigationBar。我的想法是在policy模塊中增加一個接口，通過frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java服務傳遞到狀態欄中，從而觸發顯示NavigationBar事件。
也許大家會有疑問，為什麼是在policy模塊修改？其實我這只是一種解決方案，因為我知道
frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java 有現成的手勢滑動接口。其實你也可以SystemUI中增加一個這樣的事件，我們需要的就是這麼一個觸發事件。
PhoneWindowManager.java的修改主要是實現onSwipeFromBottom(豎屏時)和onSwipeFromRight(橫屏時)兩個接口，然後調用showNavigationBar，在showNavigationBar函數中，我們調用StatusBarManagerService服務中的showNavigationBar函數，具體如下：
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;
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) {
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收到了這個消息之後，又回調給了base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java，繞了大半天，消息終於回來了，我們就是需要在PhoneStatusBar.java實現顯示NavigationBar的函數了：
+ @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
①顯示NavigationBar時，需要重新實例化一次NavigationBarView，我之前有試過移除NavigationBarView後未置空，下次添加時直接使用，會出現狀態欄重啟的情況，具體原因未知，log顯示動畫播放錯誤之類。
②重新添加NavigationBarView時需要恢復NavigationBarView之前的狀態，比如說隱藏前時是透明的、顯示輸入法按鈕、菜單鍵等等。③本文是在Android5.0的代碼上修改的，其他版本未驗證。
④本文僅是提供一種思路，並非最優方案。
android進階篇 MVP+Retrofit+RxJava框架結合
一、前言MVP模式是當前比較主流的框架，主要是由它的優點來決定的吧。本文結合了MVP+Retrofit+RxJava三大主流框架(MVP應該叫模式吧)寫了一個demo【裡
安卓(Android)實現3DTouch效果
本篇博客要做的效果圖：來個低質量動圖：這個動圖效果不是很好，實際上模糊效果應該是像上面第一張圖那樣的，後面會放出代碼，有興趣的可以試著運行一下看看效果。 先說一
Android實習札記(8)---ViewPager+Fragment實例詳解
Android實習札記(8)---ViewPager+Fragment實例講解 在札記(5)中我們就說過要弄一個模仿微信頁面切換的東東,就是V
詳解代理模式
一 摘要晚上看了關於代理模式的一篇文章,寫的非常生動,來過來分享給大家.這裡我就PHP代理模式給大家進行詳細說明.下面我們來看一看這幾天王寶強妻子出軌經紀人事件惹盡了眼球
