Android 带未捕获异常的线程退出(组=0x41a03700)
正在获取线程以未捕获异常退出(组=0x41a03700) 我想检查连接的usb设备列表,但我的应用程序崩溃了。请告诉我哪里出错了 这是我的密码:Android 带未捕获异常的线程退出(组=0x41a03700),android,usb,Android,Usb,正在获取线程以未捕获异常退出(组=0x41a03700) 我想检查连接的usb设备列表,但我的应用程序崩溃了。请告诉我哪里出错了 这是我的密码: package com.example.demo2c1testpanel; import java.nio.ByteBuffer; import java.util.HashMap; import java.util.Iterator; import android.app.Activity; import android.content.Cont
package com.example.demo2c1testpanel;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbRequest;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Loginpage extends Activity
{
public static final int targetVendorID = 6790;
public static final int targetProductID = 29987;
HashMap<String, UsbDevice> devicelist= null;
public UsbManager manager;
public UsbDeviceConnection usbDeviceConnection;
public UsbInterface usbInterfaceFound = null;
public UsbEndpoint endpointOut = null;
public UsbEndpoint endpointIn = null;
public UsbDevice usbdevice;
Button clear,signin;
EditText username,password;
String i = "";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.loginpage);
signin = (Button)findViewById(R.id.btn_signin);
signin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
check_connection();
}
});
}
public void check_connection()
{
manager = (UsbManager)getSystemService(Context.USB_SERVICE);
devicelist = manager.getDeviceList();
if(devicelist!=null)
{
if(usbdevice.getProductId()==targetProductID && usbdevice.getVendorId()==targetVendorID)
{
Toast.makeText(Loginpage.this, "Device connected", Toast.LENGTH_LONG).show();
}
}
else
Toast.makeText(Loginpage.this, "No Device connected", Toast.LENGTH_LONG).show();
}
}
我的舱单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.demo2c1testpanel"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Homescreen"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Loginpage"
android:label="@string/title_activity_loginpage" >
</activity>
<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
android:name=".Testspage"
android:label="@string/title_activity_testpage" >
</activity>
</application>
</manifest>
以下是我在onClickListener之后的工作代码:
public void check_connection()
{
int i,j;
String as[];
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
i = deviceList.size();
if(i==0)
{
Toast.makeText(Loginpage.this,"Device Not Connected",Toast.LENGTH_LONG).show();
return;
}
as = new String[i];
deviceList.keySet().toArray(as);
for(j=0;j<i;j++)
{
device_details = (UsbDevice)deviceList.get(as[j]);
if((device_details.getVendorId()==targetVendorID) && (device_details.getProductId()==targetProductID))
{
Toast.makeText(Loginpage.this,"Device Connected",Toast.LENGTH_LONG).show();
}
}
}
公共无效检查\u连接()
{
int i,j;
字符串为[];
UsbManager manager=(UsbManager)getSystemService(Context.USB_服务);
HashMap deviceList=manager.getDeviceList();
i=deviceList.size();
如果(i==0)
{
Toast.makeText(Loginpage.this,“设备未连接”,Toast.LENGTH_LONG.show();
返回;
}
as=新字符串[i];
deviceList.keySet().toArray(as);
对于(j=0;jYourusbdevice
对象为空。我只看到定义。您可以查看以下内容:感谢您的快速帮助…@BatuhanC和@JLONG,但我自己找到了答案
public void check_connection()
{
int i,j;
String as[];
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
i = deviceList.size();
if(i==0)
{
Toast.makeText(Loginpage.this,"Device Not Connected",Toast.LENGTH_LONG).show();
return;
}
as = new String[i];
deviceList.keySet().toArray(as);
for(j=0;j<i;j++)
{
device_details = (UsbDevice)deviceList.get(as[j]);
if((device_details.getVendorId()==targetVendorID) && (device_details.getProductId()==targetProductID))
{
Toast.makeText(Loginpage.this,"Device Connected",Toast.LENGTH_LONG).show();
}
}
}