USB主机为Android [英] USB host for android
问题描述
我想用我的freeduino板，类似于通过USB通过Android设备的Nexus 7其中有4.2（果冻豆）在它的Arduino UNO通讯
我使用的开发者指南从一两个月，但没有结果与设备进行通信。我觉得我缺少一些东西分钟。我想简单地显示我的freeduino板的供应商ID。我的清单文件看起来是这样的。
＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;清单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=com.example.usb_host_final_try
安卓版code =1
机器人：=的versionName1.0＆GT; ＆LT;用途-SDK
安卓的minSdkVersion =8
机器人：targetSdkVersion =17/＆GT; ＆lt;应用
机器人：allowBackup =真
机器人：图标=@绘制/ ic_launcher
机器人：标签=@字符串/ APP_NAME
机器人：主题=@风格/ AppTheme＆GT;
＆LT;活动
机器人：名字=com.example.usb_host_final_try.MainActivity
机器人：标签=@字符串/ APP_NAME＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT; ＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.hardware.usb.action.USB_DEVICE_ATTACHED/＆GT;
＆所述; /意图滤光器＆gt; ＆LT;元数据机器人：名字=android.hardware.usb.action.USB_DEVICE_ATTACHED
机器人：资源=@ XML / device_filter/＆GT;
＆LT; /活性GT;
＆LT; /用途＆gt;＆LT; /清单＆GT;
我已经在res / XML目录中创建的文件device_filter。它看起来像这样
＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;资源＆GT;
＆LT; USB设备厂商ID =0403产品ID =07d7/＆GT;
＆LT; /资源＆GT;
和我MainActivity.java具有以下code。
包com.example.usb_host_final_try;进口的java.util.HashMap;进口android.hardware.usb.UsbDevice;
进口android.hardware.usb.UsbManager;
进口android.os.Build;
进口android.os.Bundle;
进口android.annotation.TargetApi;
进口android.app.Activity;
进口android.content.Context;
进口android.content.Intent;
进口android.view.Menu;
进口android.widget.TextView;公共类MainActivity延伸活动{ @TargetApi（Build.VERSION_ codeS.HONEYCOMB_MR1）
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）; 意向意图=新的Intent（）;
UsbManager经理=（UsbManager）getSystemService（Context.USB_SERVICE）;
HashMap的＆LT;弦乐，UsbDevice＆GT; DEVICELIST = manager.getDeviceList（）;
UsbDevice设备= deviceList.get（设备名称）;
INT VID = device.getVendorId（）;
TextView的电视=（的TextView）findViewById（R.id.textview）;
tv.setText（Integer.toString（VID））;
}
请帮我出我是从过去几个月搞砸了现在。我曾尝试这样做，但它也不能正常工作。
<一个href=\"http://stackoverflow.com/questions/12110555/how-to-detect-usb-device-in-android-tablet-which-acts-as-usb-host\">Stack overfolow问题
包com.example.usb_host_final_try;进口的java.util.HashMap;
进口java.util.Iterator的;进口android.hardware.usb.UsbAccessory;
进口android.hardware.usb.UsbDevice;
进口android.hardware.usb.UsbManager;
进口android.os.Build;
进口android.os.Bundle;
进口android.annotation.TargetApi;
进口android.app.Activity;
进口android.app.PendingIntent;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.util.Log;
进口android.view.Menu;
进口android.widget.TextView;公共类MainActivity延伸活动{ 受保护的静态最后弦乐TAG = NULL; @TargetApi（Build.VERSION_ codeS.HONEYCOMB_MR1）
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）; UsbManager经理=（UsbManager）getSystemService（Context.USB_SERVICE）;
HashMap的＆LT;弦乐，UsbDevice＆GT; DEVICELIST = manager.getDeviceList（）;
迭代器＆LT; UsbDevice＆GT; deviceIterator = deviceList.values（）迭代器（）。
而（deviceIterator.hasNext（））{
UsbDevice设备= deviceIterator.next（）;
字符串s = device.getDeviceName（）;
INT PID = device.getProductId（）;
INT VID = device.getVendorId（）;
TextView的电视=（的TextView）findViewById（R.id.textview）;
tv.setText（S +\\ n+ Integer.toString（PID）+\\ n+ Integer.toString（VID））;
} } @覆盖
公共布尔onCreateOptionsMenu（菜单菜单）{
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater（）膨胀（R.menu.activity_main，菜单）;
返回true;
}}
一切都归功于奥列格Vaskevich！
I am trying to communicate with my freeduino board which is similar to arduino uno via usb through android device 'nexus 7' which has 4.2 (jelly beans) in it.
I used the developers guide to communicate with the device from a couple of months but with no result. I think i am missing something minute in it. I am trying to simply display the vendor id of my freeduino board. My manifest file look like this.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.usb_host_final_try"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.usb_host_final_try.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
android:resource="@xml/device_filter" />
</activity>
</application>
</manifest>
I have created a file device_filter in res/xml dir. which look like this
<?xml version="1.0" encoding="utf-8"?>
<resources>
<usb-device vendor-id="0403" product-id="07d7" />
</resources>
and my MainActivity.java has the following code.
package com.example.usb_host_final_try;
import java.util.HashMap;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent();
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
UsbDevice device = deviceList.get("deviceName");
int vid=device.getVendorId();
TextView tv = (TextView) findViewById(R.id.textview);
tv.setText(Integer.toString(vid));
}
please help me out i am screwed up over it from past few months now. I have tried doing this but it is also not working.
I have tried all these and still haven't been able to succeed. I also tried to use an if else loop to see if enumeration works where i set the text to device not found if no device is else settext to vendor id. On emulator is showed no device found but on my tablet wen i connect the device it force closes or else it still shows no device found wen nothing is connected.
The stack trace is here..
01-05 09:10:35.364: W/Trace(1658): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:35.364: W/Trace(1658): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:35.464: W/Trace(1658): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:35.464: W/Trace(1658): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:35.624: D/AndroidRuntime(1658): Shutting down VM 01-05 09:10:35.624: W/dalvikvm(1658): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 01-05 09:10:35.644: E/AndroidRuntime(1658): FATAL EXCEPTION: main 01-05 09:10:35.644: E/AndroidRuntime(1658): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.usb_host_final_try/com.example.usb_host_final_try.MainActivity}: java.lang.NullPointerException 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread.access$600(ActivityThread.java:141) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.os.Handler.dispatchMessage(Handler.java:99) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.os.Looper.loop(Looper.java:137) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread.main(ActivityThread.java:5039) 01-05 09:10:35.644: E/AndroidRuntime(1658): at java.lang.reflect.Method.invokeNative(Native Method) 01-05 09:10:35.644: E/AndroidRuntime(1658): at java.lang.reflect.Method.invoke(Method.java:511) 01-05 09:10:35.644: E/AndroidRuntime(1658): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 01-05 09:10:35.644: E/AndroidRuntime(1658): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 01-05 09:10:35.644: E/AndroidRuntime(1658): at dalvik.system.NativeStart.main(Native Method) 01-05 09:10:35.644: E/AndroidRuntime(1658): Caused by: java.lang.NullPointerException 01-05 09:10:35.644: E/AndroidRuntime(1658): at com.example.usb_host_final_try.MainActivity.onCreate(MainActivity.java:35) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.Activity.performCreate(Activity.java:5104) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 01-05 09:10:35.644: E/AndroidRuntime(1658): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 01-05 09:10:35.644: E/AndroidRuntime(1658): ... 11 more 01-05 09:10:46.074: W/Trace(1712): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:46.074: W/Trace(1712): Unexpected value from nativeGetEnabledTags: 0 01-05 09:10:46.754: D/AndroidRuntime(1712): Shutting down VM 01-05 09:10:46.754: W/dalvikvm(1712): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 01-05 09:10:46.766: E/AndroidRuntime(1712): FATAL EXCEPTION: main 01-05 09:10:46.766: E/AndroidRuntime(1712): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.usb_host_final_try/com.example.usb_host_final_try.MainActivity}: java.lang.NullPointerException 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread.access$600(ActivityThread.java:141) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.os.Handler.dispatchMessage(Handler.java:99) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.os.Looper.loop(Looper.java:137) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread.main(ActivityThread.java:5039) 01-05 09:10:46.766: E/AndroidRuntime(1712): at java.lang.reflect.Method.invokeNative(Native Method) 01-05 09:10:46.766: E/AndroidRuntime(1712): at java.lang.reflect.Method.invoke(Method.java:511) 01-05 09:10:46.766: E/AndroidRuntime(1712): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 01-05 09:10:46.766: E/AndroidRuntime(1712): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 01-05 09:10:46.766: E/AndroidRuntime(1712): at dalvik.system.NativeStart.main(Native Method) 01-05 09:10:46.766: E/AndroidRuntime(1712): Caused by: java.lang.NullPointerException 01-05 09:10:46.766: E/AndroidRuntime(1712): at com.example.usb_host_final_try.MainActivity.onCreate(MainActivity.java:35) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.Activity.performCreate(Activity.java:5104) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 01-05 09:10:46.766: E/AndroidRuntime(1712): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 01-05 09:10:46.766: E/AndroidRuntime(1712): ... 11 more 01-05 09:10:49.104: I/Process(1712): Sending signal. PID: 1712 SIG: 9
the main activity will now become like this and rest of it remains the same
package com.example.usb_host_final_try;
import java.util.HashMap;
import java.util.Iterator;
import android.hardware.usb.UsbAccessory;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
protected static final String TAG = null;
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while(deviceIterator.hasNext()){
UsbDevice device = deviceIterator.next();
String s=device.getDeviceName();
int pid= device.getProductId();
int vid = device.getVendorId();
TextView tv = (TextView) findViewById(R.id.textview);
tv.setText(s+"\n"+Integer.toString(pid)+"\n"+Integer.toString(vid));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
All thanks to oleg Vaskevich!!
这篇关于USB主机为Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
