Question

当我连接和拆卸USB设备时，我正试图在我的Android应用程序中弹出一个吐司..
短 - 它不工作..有人可以请告诉我我错过了什么？尝试将三星硬键盘连接到samasung平板电脑并让我的应用程序在附加或分离时检测到它

我的活动

    import java.util.ArrayList;
    import java.util.HashMap;

    import com.eliddell.R;
    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.content.res.Configuration;
    import android.hardware.usb.UsbAccessory;
    import android.hardware.usb.UsbDevice;
    import android.hardware.usb.UsbManager;
    import android.location.GpsStatus.Listener;
    import android.mtp.MtpDevice;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.inputmethod.InputMethodManager;
    import android.widget.Toast;

    public class UiModeTestActivity extends Activity {
        /** Called when the activity is first created. */
        //UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            String str = (String) getLastNonConfigurationInstance();

            IntentFilter filter = new IntentFilter("android.hardware.usb.action.USB_ACCESSORY_ATTACHED");
registerReceiver(mUsbReceiver, filter);

        }


       private static final String ACTION_USB_PERMISSION ="com.android.example.USB_PERMISSION";
       private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {

            public void onReceive(Context context, Intent intent) {
                Toast.makeText(getApplicationContext(), "received", Toast.LENGTH_SHORT).show();
                String action = intent.getAction();
                if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) {
                    UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
                    Toast.makeText(getApplicationContext(), "attached", Toast.LENGTH_SHORT).show();
                }
                if (UsbManager.ACTION_USB_ACCESSORY_ATTACHED.equals(action)) {
                    UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
                    Toast.makeText(getApplicationContext(), "detached", Toast.LENGTH_SHORT).show();
                }
            }
        };

    };

我的清单：

<?xml version="1.0" encoding="utf-8"?>

<uses-sdk android:minSdkVersion="12" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"

    >
    <uses-library android:name="com.android.future.usb.accessory" /> 
    <activity
        android:name=".UiModeTestActivity"
        android:configChanges="keyboard|uiMode|orientation"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <meta-data android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
            android:resource="@xml/accessory_filter" />
    </activity>

</application>

Answer 1

EDIT2：

试图将三星硬键盘连接到三星平板电脑

如果我没弄错的话：问题是键盘不是USB Acessory，因此不应该触发USB_ACCESSORY_ATTACHED部分。

忘记下面的部分：）

尝试替换

 UsbManager mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
//final String ACTION_USB_PERMISSION ="com.android.example.USB_PERMISSION";

PendingIntent mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);

与

IntentFilter filter = new IntentFilter("android.hardware.usb.action.USB_ACCESSORY_ATTACHED");
registerReceiver(mUsbReceiver, filter);

并删除

<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />

来自AndroidManifest.xml的

您对广播意图的权限感到困惑。

编辑：嗯，这可能是完全错误的：http://developer.android.com/guide/topics/usb/accessory.html做你做的事。

检测usb设备android

1 个答案: