为什么我的选择设备活动不运行?

Question

我一直在通过android studio制作App。该应用程序的想法是，它通过蓝牙从arduino获取数据，并将数据显示给用户。但是我为选择设备活动所做的Java类，它是启动它的那个，并没有运行。我已经用logcat检查过了。｀我也张贴了我所有的代码在github: https://github.com/OtakuDisease/Hivey这是SelectDeviceActivity.java类。

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.os.Bundle;
import android.view.View;
import com.example.hivey.ui.DeviceInfoModel;
import com.example.hivey.ui.DeviceListAdapter;
import com.google.android.material.snackbar.Snackbar;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class SelectDeviceActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_device);
// Bluetooth Setup
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// Get List of Paired Bluetooth Device
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
List<Object> deviceList = new ArrayList<>();
if (pairedDevices.size() > 0) {
// There are paired devices. Get the name and address of each paired device.
for (BluetoothDevice device : pairedDevices) {
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
DeviceInfoModel deviceInfoModel = new DeviceInfoModel(deviceName,deviceHardwareAddress);
deviceList.add(deviceInfoModel);
}
// Display paired device using recyclerView
RecyclerView recyclerView = findViewById(R.id.recyclerViewDevice);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
DeviceListAdapter deviceListAdapter = new DeviceListAdapter(this,deviceList);
recyclerView.setAdapter(deviceListAdapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
} else {
View view = findViewById(R.id.recyclerViewDevice);
Snackbar snackbar = Snackbar.make(view, "Activate Bluetooth or pair a Bluetooth device", Snackbar.LENGTH_INDEFINITE);
snackbar.setAction("OK", new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
snackbar.show();
}
}
}

Answer 1

您可以发送您的logcat错误吗?这可能是一个空指针异常(可能，不确定)