Re: [問題] UsbManager 同時支援2.3.4和3.0+

[issuemylove (skill)]

想請問各位大大我 Part 1: 這樣 reflection的使用是對的嗎?

關於 part 2: 我完全沒有頭緒啊QQ

謝謝各位大大的賜教

( http://ppt.cc/~GXV 此為傷眼比較版 sorry QQ)

以下附上我原先寫的程式是

com.android.future.usb.UsbManager future = null;
android.hardware.usb.UsbManager hardware = null;

if( android.os.Build.VERSION.SDK_INT >10){
// Part 1:
    hardware =
            (android.hardware.usb.UsbManager)
                    context.getSystemService(Context.USB_SERVICE);
    android.hardware.usb.UsbAccessory mAcc[] = null;
    mAcc = hardware.getAccessoryList();
}
else{
// Part 2:
    future = com.android.future.usb.UsbManager.getInstance(context);
    com.android.future.usb.UsbAccessory mAcc[] = null;
    mAcc = future.getAccessoryList();
}

改成 reflection後是
try{
// Part 1:
// 這部分用這樣不知道對不對 > <|||
    Class<?> futureClass = Class.forName("com.android.future.usb.UsbManager");
    Method m = futureClass.getMethod("getInstance", new Class[]{Context.class});
    com.android.future.usb.UsbManager future =
                        (UsbManager) m.invoke(null, context);
    com.android.future.usb.UsbAccessory mAcc[] = null;
    mAcc = future.getAccessoryList();
}
catch( ClassNotFoundException e){
// Part 2:
// 這部分完全不知道該怎麼改(跟未修改前一模一樣)

   主要是因為是使用 context.getSystemService來取得 UsbManager實體
    android.hardware.usb.UsbManager hardware = null;
    hardware =
                (android.hardware.usb.UsbManager)
                        context.getSystemService(Context.USB_SERVICE);
    android.hardware.usb.UsbAccessory mAcc[] = null;
    mAcc = hardware.getAccessoryList();
}

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※ 編輯: issuemylove     來自: 118.163.3.187        (11/20 13:37)