获取接收java.lang.RuntimeException：无法销毁活动{com.android.systemui / com.android.systemui.usb.UsbPermissionActivity}
这是onClickListener之后的代码：
login.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
String User_Name;
User_Name=username.getText().toString();
Device_Found=0;
if(User_Name.toLowerCase().equals("medequip") && password.getText().toString().equals("medequip"))
{
Communication_Ok=0; Permission_Error=0;
checkdeviceconnection();
if(Device_Found==1)
{
Data_Rx_Index=Data_Index=setTotal_Frame_Received(0);
if(Permission_Error==1)
checkdeviceconnection();
Receive.start();
long i,j;
for(i=0;i<1000;i++)
for(j=0;j<1000;j++);
if(Communication_Ok==1)
Toast.makeText(Medequiplogin.this, "Communication_Ok", 10000).show();
else
Toast.makeText(Medequiplogin.this, "Communication Failure", 10000).show();
Intent i3 = new Intent(Medequiplogin.this,Modes.class);
startActivity(i3);
}
else
{ Toast.makeText(Medequiplogin.this, "Device Connection Problem", 10000).show();
return;}
}
else
{
Toast.makeText(Medequiplogin.this, "Plesae Enter valid Username and Password", 10000).show();
}
}
});
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
username.setText("");
password.setText("");
}
});
}
protected void checkdeviceconnection()
{
int i,j;
String as[];
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
i = deviceList.size();
if(i==0)
{
return;
}
as = new String[i];
deviceList.keySet().toArray(as);
for(j=0;j<i;j++)
{
Device_Detials = (UsbDevice)deviceList.get(as[j]);
if((Device_Detials.getVendorId()==targetVendorID) && (Device_Detials.getProductId()==targetProductID))
{
break;
}
}
if(Device_Detials!=null)
{
usbManager = (UsbManager)getSystemService(Context.USB_SERVICE);
if(usbManager.hasPermission(Device_Detials)==true)
{
// Toast.makeText(Medequiplogin.this, "Permission Granted", Toast.LENGTH_LONG).show();
Device_Settings(Device_Detials,j);
}
else
{
//PendingIntent intent = null;
// Toast.makeText(Medequiplogin.this, "No Permission", Toast.LENGTH_LONG).show();
usbManager.requestPermission(Device_Detials, null);
Permission_Error=1;
return;
}
Device_Settings(Device_Detials,j);
}
}
UsbDeviceConnection Device_Settings(UsbDevice device,int Port_No)
{
UsbEndpoint tOut = null;
UsbEndpoint tIn = null;
UsbInterface usbinterface = device.getInterface(Port_No);
if (usbinterface == null)
{
Toast.makeText(Medequiplogin.this, "Device Found But UnKnown Exception-1", 50000).show();
return null;
}
int tEndpointCnt = usbinterface.getEndpointCount();
if (tEndpointCnt >= 2)
{
for (int j = 0; j < tEndpointCnt; j++)
{
if (usbinterface.getEndpoint(j).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK)
{
if (usbinterface.getEndpoint(j).getDirection() == UsbConstants.USB_DIR_OUT)
{
tOut = usbinterface.getEndpoint(j);
}
else if (usbinterface.getEndpoint(j).getDirection() == UsbConstants.USB_DIR_IN)
{
tIn = usbinterface.getEndpoint(j);
}
}
}
if (tOut != null && tIn != null)
{
usbInterfaceFound = usbinterface;
endpointOut = tOut;
endpointIn = tIn;
deviceFound = device;
if (device != null)
{
Toast.makeText(Medequiplogin.this, device+" ", Toast.LENGTH_LONG).show();
UsbDeviceConnection connection = usbManager.openDevice(device);
if (connection != null && connection.claimInterface(usbInterfaceFound, true))
{
connection.controlTransfer(0x21, 34, 0, 0, null, 0, 0);
connection.controlTransfer(0x21, 32, 0, 0, new byte[] { (byte) 0x80, 0x25, 0x00, 0x00, 0x00, 0x00, 0x08 }, 7, 0);
usbDeviceConnection = connection;
usbDeviceConnection_For_Transfer = connection;
Communication_Byte[0]='&';
usbDeviceConnection.bulkTransfer(endpointOut,Communication_Byte, 1, 0);
Device_Found=1;
return usbDeviceConnection;
}
else
{
Toast.makeText(Medequiplogin.this, "Device Found But Unable to Open Device(Exception-3)", 50000).show();
usbDeviceConnection = null;
}
}
}
else
{
Toast.makeText(Medequiplogin.this, "Device Found But No End Points(Exception-4)", 50000).show();
}
}
else
{
Toast.makeText(Medequiplogin.this, "Device Found But No End Points(Exception-2)", 50000).show();
return null;
}
return null;
}
这是我的logcat：
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to destroy activity {com.android.systemui/com.android.systemui.usb.UsbPermissionActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3499)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3517)
at android.app.ActivityThread.access$1200(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.android.systemui.usb.UsbPermissionActivity.onDestroy(UsbPermissionActivity.java:148)
at android.app.Activity.performDestroy(Activity.java:5302)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1117)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3486)
这是我的清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.medequip.irisandroid"
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=".Home_Page"
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=".Medequiplogin"
android:icon="@drawable/login"
android:label="@string/title_activity_medequiplogin" >
</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=".Modes"
android:icon="@drawable/mode"
android:label="@string/title_activity_modes" >
</activity>
<activity
android:name=".ManualMode"
android:icon="@drawable/manual"
android:label="@string/title_activity_manual_mode" >
</activity>
<activity
android:name=".Tablelayout"
android:label="@string/title_activity_tablelayout" >
</activity>
<activity
android:name=".AutoMode"
android:icon="@drawable/auto"
android:label="@string/title_activity_auto_mode" >
</activity>
<activity
android:name=".Graph_Demo_val"
android:icon="@drawable/line"
android:label="@string/title_activity_Graph_Demo" >
</activity>
</application>
</manifest>