Android 11 Java 蓝牙测试代码，用于搜索和显示蓝牙状态，并利用view显示出来

好的，以下是一个简单的 Android 11 Java 蓝牙测试代码，用于搜索和显示蓝牙状态，并利用 View 显示出来：

public class MainActivity extends AppCompatActivity {

    private BluetoothAdapter mBluetoothAdapter;
    private ArrayAdapter<String> mArrayAdapter;
    private ListView mListView;
    private TextView mTextView;

    private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
                int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
                switch (state) {
                    case BluetoothAdapter.STATE_OFF:
                        mTextView.setText("Bluetooth off");
                        break;
                    case BluetoothAdapter.STATE_TURNING_OFF:
                        mTextView.setText("Turning Bluetooth off...");
                        break;
                    case BluetoothAdapter.STATE_ON:
                        mTextView.setText("Bluetooth on");
                        break;
                    case BluetoothAdapter.STATE_TURNING_ON:
                        mTextView.setText("Turning Bluetooth on...");
                        break;
                }
            } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName = device.getName();
                String deviceHardwareAddress = device.getAddress();
                mArrayAdapter.add(deviceName + "\n" + deviceHardwareAddress);
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        mTextView = findViewById(R.id.bluetooth_status_text_view);
        mListView = findViewById(R.id.bluetooth_device_list_view);
        mArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
        mListView.setAdapter(mArrayAdapter);

        // 注册广播接收器监听状态改变和发现新设备
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mBroadcastReceiver, filter);

        // 检查蓝牙是否可用
        if (mBluetoothAdapter == null) {
            mTextView.setText("Bluetooth not available");
        } else if (!mBluetoothAdapter.isEnabled()) {
            mTextView.setText("Bluetooth off");
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 0);
        } else {
            mTextView.setText("Bluetooth on");
        }

        // 搜索设备
        mBluetoothAdapter.startDiscovery();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mBroadcastReceiver);
    }

}

注意事项：

1. 首先需要在 AndroidManifest.xml 文件中添加以下权限：

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

2. 在 activity_main.xml 文件中添加一个 TextView 和一个 ListView，分别用于显示蓝牙状态和搜索到的设备列表。

3. 在 onCreate() 方法中，获取默认的 BluetoothAdapter 实例，并通过注册广播接收器监听蓝牙状态改变和发现新设备的事件。

4. 检查蓝牙是否可用并开启搜索设备功能。

5. 在 onDestroy() 方法中，注销广播接收器。