RK3288_Android_8.1_定頻關機

板子連結: http://www.itayga.com/contact.html.

程式碼路徑：frameworks\base\packages\SystemUI\src\com\android\systemui\globalactions\GlobalActionsDialog.java

private final class PowerAction extends SinglePressAction implements LongPressAction {
        private PowerAction() {
            super(R.drawable.ic_lock_power_off,
                    R.string.global_action_power_off);
        }

        @Override
        public boolean onLongPress() {
            UserManager um = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
            if (!um.hasUserRestriction(UserManager.DISALLOW_SAFE_BOOT)) {
                mWindowManagerFuncs.reboot(true);
                return true;
            }
            return false;
        }

        @Override
        public boolean showDuringKeyguard() {
            return true;
        }

        @Override
        public boolean showBeforeProvisioning() {
            return true;
        }

        @Override
        public void onPress() {
            // shutdown by making sure radio and power are handled accordingly.
            //mWindowManagerFuncs.shutdown();
			Log.d("tyzc","mWindowManagerFuncs.shutdown(false ");
			setNodeString("/sys/devices/system/cpu/cpufreq/policy0/scaling_governor","userspace");
			//更改cpu		
			setNodeString("/sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed","1008000");
			//更改頻率
			mWindowManagerFuncs.shutdown();
        }
    }
public static boolean setNodeString(String path,String value){
        try {
            BufferedWriter bufWriter = null;
            bufWriter = new BufferedWriter(new FileWriter(path));
            bufWriter.write(value);  // 寫入資料
            bufWriter.close();
            Log.d("tyzc","Rewrite the node--"+path+"--to--"+value+" success!");
        } catch (IOException e) {
            e.printStackTrace();
            Log.d("tyzc","Rewrite the node--"+path+"--to--"+value+"--failure!");
            //如果失敗，可能是節點的許可權不夠，在init.rc檔案中新增 
            //chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
    		//chmod 0666 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
            return false;
        }
        return true;
    }