我正在使用定制 OTG 指纹扫描仪。我想检查 OTG 是否已连接到我的 Android 设备或未在特定的 Android 活动中。
public class BootUpReceiver extends BroadcastReceiver {
private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
String TAG = "OTG ";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// Log.e("USB", "Device Connected -> " + action);
//Initialising global class to access USB ATTACH and DETACH state
final GlobalClass globalVariable = (GlobalClass) context.getApplicationContext();
if (action.equalsIgnoreCase("android.hardware.usb.action.USB_DEVICE_ATTACHED")) {
UsbDevice device = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if(device != null) {
int vendorID = device.getVendorId();
int productID = device.getProductId();
if(String.valueOf(productID).equalsIgnoreCase(context.getString(R.string.productID/*product id of your specific device*/))&& (String.valueOf(vendorID).equalsIgnoreCase(context.getString(R.string.vendorID/*vendor id of your specific device*/)))){
//If Product and Vendor Id match then set boolean "true" in global variable
globalVariable.setIs_OTG(true);
}else{
globalVariable.setIs_OTG(false);
}
}
} else if (action.equalsIgnoreCase("android.hardware.usb.action.USB_DEVICE_DETACHED")) {
//When ever device Detach set your global variable to "false"
globalVariable.setIs_OTG(false);
} }
从任何 Activity 中，您都可以调用全局变量来检查当前 USB 状态：
final GlobalClass globalVariable = (GlobalClass) getApplicationContext();
if (globalVariable.is_OTG()) {
//Perform your functionality
}
全球等级：
public class GlobalClass extends Application {
private boolean is_OTG = false;
public boolean is_OTG() {
return is_OTG;
}
public void setIs_OTG(boolean is_OTG) {
this.is_OTG = is_OTG;
}
}
显现：
<application
android:name="com.GlobalClass"
接收者：
<receiver
android:name=".BootUpReceiver"
android:enabled="true" >
<!-- <intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>-->
<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" />
<action android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter" />
</receiver>
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