避免Android应用因USB设备连接而意外重启的策略

<application>
    <activity android:name=".MainActivity">
        <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>

<application>
    <activity
        android:name=".MainActivity"
        android:launchMode="singleTop"> <!-- 添加此行 -->

        <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>

import android.content.Intent;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private UsbManager usbManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); // 假设您的布局文件
        Log.d(TAG, "onCreate: Activity created.");

        usbManager = (UsbManager) getSystemService(USB_SERVICE);

        // 在onCreate中处理初始启动时的Intent
        handleIntent(getIntent());
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        Log.d(TAG, "onNewIntent: New Intent received.");
        // 必须设置新的Intent，否则getIntent()仍然返回旧的Intent
        setIntent(intent); 
        handleIntent(intent);
    }

    private void handleIntent(Intent intent) {
        if (intent != null && UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(intent.getAction())) {
            UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
            if (device != null) {
                Log.i(TAG, "USB Device Attached: " + device.getDeviceName());
                // 在这里执行您的USB设备初始化或通知逻辑
                // 例如：
                // setupUsbDevice(device);
                // showToast("USB设备 " + device.getProductName() + " 已连接");
            } else {
                Log.w(TAG, "USB Device Attached intent received, but no device extra.");
            }
        } else if (intent != null && Intent.ACTION_MAIN.equals(intent.getAction())) {
            Log.d(TAG, "Main launcher intent received.");
            // 应用通过启动器图标启动
        }
    }

    // 其他生命周期方法和业务逻辑...
}