检查是否使用Android应用程序启用了蓝牙

Question

我想检查使用Android应用程序的设备中是否启用了蓝牙.我使用了.isEnabled方法.但是有一个错误.我发现(通过注释行)错误是在.isEnabled方法中.你能帮我解决这个问题吗？

final BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();

submitButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        String status = "Bluetooth";

        if(bluetooth != null) {
            if (bluetooth.isEnabled()) {
                String mydeviceaddress = bluetooth.getAddress();
                String mydevicename = bluetooth.getName();
                status = ("Address "+ mydeviceaddress + " Name" + mydevicename);
                Toast.makeText(getApplicationContext(), "" + status + "", Toast.LENGTH_LONG).show();
            } else {
                status = ("Bluetooth not enabled");
                Toast.makeText(getApplicationContext(), "" + status + "", Toast.LENGTH_LONG).show();
            }
        } else {
            Toast.makeText(getApplicationContext(), "" + status + "", Toast.LENGTH_LONG).show();
        }
    }
}

Answer 1

这对我来说效果最好:

/**
 * Check for Bluetooth.
 *
 * @return true if Bluetooth is available.
 */
public boolean isBluetoothAvailable() {
    final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

    return bluetoothAdapter != null 
        && bluetoothAdapter.isEnabled() 
        && bluetoothAdapter.getState() == BluetoothAdapter.STATE_ON;
}

Answer 2

试试这个.

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
    // Device does not support Bluetooth
} else {
    if (!bluetoothAdapter.isEnabled()) {
        // Bluetooth is not enabled
    }
}

在你的AndroidManifest.xml File添加

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