Android中通过按键旋转屏幕

Q5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;
}

OK，重新编译后，长按Menu键即可实现屏幕旋转。

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