android - 以编程方式在 Android 上启用蓝牙

Question

我正在尝试确定以编程方式在 Android 上启用蓝牙的首选方式。我发现以下任一技术都有效(至少在 Android 4.0.4 上...):

public class MyActivity extends Activity {
    public static final int MY_BLUETOOTH_ENABLE_REQUEST_ID = 6;
    ...
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, MY_BLUETOOTH_ENABLE_REQUEST_ID);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == MY_BLUETOOTH_ENABLE_REQUEST_ID) {
            if (resultCode == RESULT_OK) {
                // Request granted - bluetooth is turning on...
            }
            if (resultCode == RESULT_CANCELED) {
                // Request denied by user, or an error was encountered while 
                // attempting to enable bluetooth
            }
        }
    }

或者...

BluetoothAdapter.getDefaultAdapter().enable();

前者在启用之前询问用户许可，而后者只是默默地启用蓝牙(但需要“android.permission.BLUETOOTH_ADMIN”许可)。一种或另一种是旧的/过时的和/或一种技术是否仅在某些设备上可用？还是只是个人喜好问题？

Answer 1

在AndroidDoc中明确提到

Bluetooth should never be enabled without direct user consent. If you want to turn on Bluetooth in order to create a wireless connection, you should use the ACTION_REQUEST_ENABLE Intent, which will raise a dialog that requests user permission to turn on Bluetooth. The enable() method is provided only for applications that include a user interface for changing system settings, such as a "power manager" app.

这两种技术都行得通。您必须根据您的目的和要求进行选择。希望它能回答您的问题。