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

-------------------帖子正文-----------------------

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;
 
}