arduino on android 4.0

最新推荐文章于 2025-09-28 04:00:20 发布

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本文详细介绍了如何在ZTE u970设备上解决ADK兼容性问题，包括更新代码以支持不同Android版本，设置最小SDK版本，添加所需XML元素等步骤。

demokit (adk_release_20120606.zip (https://dl-ssl.google.com/android/adk/adk_release_20120606.zip ）) 在我的zte u970上跑不起来。一直以为是厂家把ADK部分删除了。仔细阅读了文档（ http://developer.android.com/guide/topics/connectivity/usb/accessory.html ）后发现，是我搞错了。

在Android 2.3.4,应当使用名字空间com.android.future.usb，这里是作为android的add-on

在Android3.1以后，应当使用名字空间android.hardware.usb:这里是作为android 框架的一部分。

代码也要做相应修改

ADK两个版本的比较
add-on library（android 2.3.4)	platform(android 3.1)
UsbManager manager = UsbManager.getInstance(this);	UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
UsbAccessory accessory = UsbManager.getAccessory(intent);	UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
Set the minimum SDK of the application to API Level 10	Set the minimum SDK of the application to API Level 12
add the `<uses-library>` element specifying`com.android.future.usb.accessory`	include a`<uses-feature>` element that declares that your application uses the`android.hardware.usb.accessory` feature.

常用代码

Android App USB Code

In the ADK 2012 Android app, the code for handling USB connections is encapsulated in a UsbConnection class. This class sets up a BroadcastReceiver to listen for USB events and then attempts to connect when a matching connection event is received. Here is a summary of the relevant code:

import com.android.future.usb.UsbAccessory;
import com.android.future.usb.UsbManager;

mUSBManager = UsbManager.getInstance(this);
UsbAccessory acc = mUSBManager.getAccessoryList()[0];

if (!mUSBManager.hasPermission(acc)) return;

The ADK 2012 app uses the support library to implement the USB accessory connections, in order to support devices running Android 2.3.4 (API Level 10). If you only need to support Android 3.1 (API Level 12) and higher devices, you can replace the first 4 lines the following code:

import android.hardware.usb.UsbAccessory
import android.hardware.usb.UsbManager

mUSBManager = (UsbManager) getSystemService(Context.USB_SERVICE);
UsbAccessory acc = (UsbAccessory)
                   intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);

Note that the app only receives events when the USB accessory identification information matches the information in theres/xml/usb_accessory_filter.xml file, referenced by the application’s manifest statement:

<meta-data
    android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
    android:resource="@xml/usb_accessory_filter" />

Connections from other USB devices are not received by the ADK 2012 accessory.

ref:

adk_release_20120606.zip (https://dl-ssl.google.com/android/adk/adk_release_20120606.zip ）

http://developer.android.com/guide/topics/connectivity/usb/accessory.html

http://developer.android.com/tools/adk/adk2.html

http://developer.android.com/tools/adk/adk.html