解决 Android 5.1 触摸屏上的多任务按键没有震动反馈的 bug

之前在没有遇到过这样的问题，网络上搜索也没有相关的解决方法。偶然的机会发现 framework 中的 PhoneWindowManager.java 会拦截相关的按键事件，研究之后，发现就是在这个文件中做按键的压感反馈。

解决方案如下：

1. 平台 rk3368， Android5.1
2. 解决方案：

   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 d25051e..295ad5c 100755 (executable)
   --- a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
   +++ b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
   @@ -5160,7 +5160,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
    mKeyguardDelegate.isShowing()));
    
    //ADD BY LJH START
   - if (down && ((keyCode == KeyEvent.KEYCODE_HOME)||(keyCode == KeyEvent.KEYCODE_MENU)||(keyCode == KeyEvent.KEYCODE_BACK)))
   + if (down && ((keyCode == KeyEvent.KEYCODE_HOME)||(keyCode == KeyEvent.KEYCODE_MENU)||(keyCode == KeyEvent.KEYCODE_BACK) || (keyCode == KeyEvent.KEYCODE_APP_SWITCH)))
    {
    performHapticFeedbackLw(null, HapticFeedbackConstants.VIRTUAL_KEY, false);
    }