Android P系统默认蓝牙状态栏不显示图标

        在Android P版本，状态栏上的蓝牙图标只有在连接蓝牙耳机或者蓝牙网络时才会显示，目前客户要求，只要打开蓝牙功能就必须显示蓝牙图标

       修改如下：

   文件路径（MTK平台）

    /vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java

  

private final void updateBluetooth() {
        int iconId = R.drawable.stat_sys_data_bluetooth;
        String contentDescription =
                mContext.getString(R.string.accessibility_quick_settings_bluetooth_on);
        boolean bluetoothVisible = false;
        if (mBluetooth != null) {
            //wei modify for bluetooth start
            if(mBluetooth.isBluetoothEnabled()) {
                bluetoothVisible = mBluetooth.isBluetoothEnabled();
                if (mBluetooth.isBluetoothConnected()) {
                    iconId = R.drawable.stat_sys_data_bluetooth;
                    contentDescription = mContext.getString(R.string.accessibility_bluetooth_connected);
                    bluetoothVisible = mBluetooth.isBluetoothEnabled();
                }
            }
            //wei modify for bluetooth start
        }

        mIconController.setIcon(mSlotBluetooth, iconId, contentDescription);
        mIconController.setIconVisibility(mSlotBluetooth, bluetoothVisible);
    }

 主要是在蓝牙打开状态将bluetoothVisible = mBluetooth.isBluetoothEnabled();重新赋值一下即可