How to rotate screen orientation by pressing a key or in Settings>Display?

There is no gyroscope to detect device orientation on my device. So I want to rotate screen orientation when user pressing a key such as ALT key or setting "Auto-rotate screen" on in Settings>Display.


1. Modify the label of Auto-rotate screen in strings.xml

--- a/packages/apps/Settings/res/values/strings.xml 2011-07-25 14:17:04.634655000 +0900

+++ b/packages/apps/Settings/res/values/strings.xml 2011-07-25 14:21:31.033813231 +0900

@@ -1161,8 +1161,8 @@

     <string name="animations_summary_on">Show animation when opening & closing windows</string>

>

     <!-- Sound & display settings screen, animations option summary text when check box is clear --

>

     <string name="animations_summary_off">Show animation when opening & closing windows</string

>

-    <!-- Sound & display settings screen, accelerometer-based rotation check box label --

>

-    <string name="accelerometer_title">Auto-rotate screen</string

>

+    <!-- Sound & display settings screen, accelerometer-based rotation check box label // Modified by kangadin --

+    <string name="accelerometer_title">Landscape mode</string>

>

     <!-- Sound & display settings screen, accelerometer-based rotation summary text when check box is selected --

>

     <string name="accelerometer_summary_on">Switch orientation automatically when rotating phone</string

     <!-- Sound & display settings screen, accelerometer-based rotation summary text when check box is clear -->


2. Modify setRotation() and setRotationUncheckedLocked() functions in WindowManagerService.java


--- a/frameworks/base/services/java/com/android/server/WindowManagerService.java 2011-07-25 17:53:16.803818344 +0900
+++ b/frameworks/base/services/java/com/android/server/WindowManagerService.java 2011-07-26 10:21:02.353842187 +0900
@@ -4530,8 +4530,9 @@
             mLastRotationFlags = animFlags;
         }
         if (DEBUG_ORIENTATION) Slog.v(TAG, "Overwriting rotation value from " + rotation);
-        rotation = mPolicy.rotationForOrientationLw(mForcedAppOrientation,
-                mRotation, mDisplayEnabled);
+        // kangadin
+        //rotation = mPolicy.rotationForOrientationLw(mForcedAppOrientation,
+        //        mRotation, mDisplayEnabled);
         if (DEBUG_ORIENTATION) Slog.v(TAG, "new rotation is set to " + rotation);
         changed = mDisplayEnabled && mRotation != rotation;

3. Add key code processing in interceptkeyBeforeDispatching() function in PhoneWindowManager.java


--- a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java 2011-07-25 17:53:34.203818351 +0900
+++ b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java 2011-07-26 14:20:40.597822000 +0900
@@ -223,7 +223,7 @@
     boolean mScreenOn = false;
     boolean mOrientationSensorEnabled = false;
     int mCurrentAppOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
-    static final int DEFAULT_ACCELEROMETER_ROTATION = 0;
+    static final int DEFAULT_ACCELEROMETER_ROTATION = 1; // kangadin
     int mAccelerometerDefault = DEFAULT_ACCELEROMETER_ROTATION;
     boolean mHasSoftInput = false;
   
@@ -596,6 +596,8 @@
                 com.android.internal.R.array.config_safeModeDisabledVibePattern);
         mSafeModeEnabledVibePattern = getLongIntArray(mContext.getResources(),
                 com.android.internal.R.array.config_safeModeEnabledVibePattern);
+        Settings.System.putInt(mContext.getContentResolver(), // kangadin
+            Settings.System.ACCELEROMETER_ROTATION, DEFAULT_ACCELEROMETER_ROTATION);
     }


     public void updateSettings() {
@@ -616,7 +618,14 @@
                     Settings.System.ACCELEROMETER_ROTATION, DEFAULT_ACCELEROMETER_ROTATION);
             if (mAccelerometerDefault != accelerometerDefault) {
                 mAccelerometerDefault = accelerometerDefault;
-                updateOrientationListenerLp();
+                //updateOrientationListenerLp(); // kangadin
+                try { // kangadin
+                    mWindowManager.setRotation(accelerometerDefault == 0 ?
+ Surface.ROTATION_90 : Surface.ROTATION_0,
+ true, mFancyRotationAnimation);
+                } catch (RemoteException e) {
+                    // Ignore
+                }  
             }
             if (mSystemReady) {
                 int pointerLocation = Settings.System.getInt(resolver,
@@ -1218,6 +1227,15 @@
                     return true;
                 }
             }
+        } else if (keyCode == KeyEvent.KEYCODE_ALT_LEFT || keyCode == KeyEvent.KEYCODE_ALT_RIGHT) { // kangadin
+            if (down && repeatCount == 0) {
+                // Toggle ACCELEROMETER_ROTATION
+                int ro = Settings.System.getInt(mContext.getContentResolver(),
+                    Settings.System.ACCELEROMETER_ROTATION, DEFAULT_ACCELEROMETER_ROTATION);
+                Settings.System.putInt(mContext.getContentResolver(),
+                    Settings.System.ACCELEROMETER_ROTATION, ro == 0 ? 1 : 0);
+            }
+            return true;
         }
       
         // Shortcuts are invoked through Search+key, so intercept those here


4. Remove android:screenOrientation field in AndroidManifest.xml


packages/apps/Launcher2/AndroidManifest.xml
packages/apps/Contacts/AndroidManifest.xml
packages/apps/Phone/AndroidManifest.xml
packages/apps/Settings/AndroidManifest.xml
packages/apps/VoiceDialer/AndroidManifest.xml


(The End)