Android 通过按键旋转屏幕

很好的帖子：
自己做的立方体旋转效果
http://www.eoeandroid.com/thread-185331-1-1.html
Android多线程后台下源码
http://www.eoeandroid.com/thread-185328-1-1.html
android仿酷狗播放器
http://www.eoeandroid.com/thread-185894-1-1.html

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有个功能，通过长按menu按键，可以旋转屏幕方向(0°或者90°)，这个功能有时蛮有用的，下面来看看是如何实现的：

1 修改按键处理程序

frameworks/policies/base/phone/com/android/internal/policy/impl/PhoneWindowManager.java

函数

public boolean interceptKeyTi(WindowState win, int code, int metaKeys, boolean down,int repeatCount, int flags)        //在处理菜单键的地方        if (code == KeyEvent.KEYCODE_MENU) {     final int chordBug = KeyEvent.META_SHIFT_ON;        if (down && repeatCount == 0) {     if (mEnableShiftMenuBugReports && (metaKeys & chordBug) == chordBug) {     Intent intent = new Intent(Intent.ACTION_BUG_REPORT);   mContext.sendOrderedBroadcast(intent, null);     return true;     } else if (SHOW_PROCESSES_ON_ALT_MENU &&(metaKeys & KeyEvent.META_ALT_ON) == KeyEvent.META_ALT_ON) {        Intent service = new Intent();     service.setClassName(mContext, "com.android.server.LoadAverageService");   ContentResolver res = mContext.getContentResolver();     boolean shown = Settings.System.getInt(res, Settings.System.SHOW_PROCESSES, 0) != 0;        if (!shown) {     mContext.startService(service);     } else {   mContext.stopService(service);     }      Settings.System.putInt(res, Settings.System.SHOW_PROCESSES, shown ? 0 : 1);     return true;     }  }        //上面是原来的内容，下面是添加的新内容     else if (down && repeatCount == 20 && MenuKeyUp && (!keyguardOn)) {     //如果按下Menu键一定时间，抬起时执行此段函数     MenuKeyUp = false;     try {     int ro = mWindowManager.getRotation(); //获取当前方向  if( ro == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE ) {     ro = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;

} else {

ro = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;

}

}catch (RemoteException e) {

Log.v(TAG, "!!! getRotation fail !!!");

}

try {

//旋转屏幕

mWindowManager.setRotation(ro, true, Surface.FLAGS_ORIENTATION_ANIMATION_DISABLE);

//最后可跟不同的参数，可实现一些旋转效果

}

catch (RemoteException e) {

Log.v(TAG, "!!! mWindowManager.setRotation fail !!!");

}

return true;

}

if(!down)
{

MenuKeyUp = true;

}

}

2 修改实现选择的函数

/frameworks/base/services/java/com/android/server/WindowManagerService.java     //找到该函数     public boolean setRotationUncheckedLocked(int rotation, int animFlags)     //将以下妨碍选择的内容注释掉     //rotation = mPolicy.rotationForOrientationLw(mForcedAppOrientation,     // mRotation, mDisplayEnabled);

3、当然也可以新作一个rotate键来选择屏幕，以下是引用代码

} else if (code == KeyEvent.KEYCODE_ROTATE) {     // ROTATE KEY pressed           if (down) {     mButtonPushFlg = true;     try {     int ro = mWindowManager.getRotation(); // Orientation vertical     if (ro == 3 ) {        mWindowManager.setRotation (Surface.ROTATION_0,true,mFancyRotationAnimation);   //Orientation landscape        } else {     mWindowManager.setRotation(Surface.ROTATION_270,true,mFancyRotationAnimation);   //Orientation portlate        }     } catch (RemoteException e) {     // Igbore     Log.i("info", "Rotation failed ");     }     }     return true;     }

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