startActivityForResult 已弃用，无法使用新代码请求蓝牙连接

Question

Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

我请求使用上面的源代码启动蓝牙。但是，startActivityForResult已被弃用。所以，我正在寻找新的代码来处理这个问题。这是我找到的解决方案。

// You can do the assignment inside onAttach or onCreate, i.e, before the activity is displayed
    ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        // There are no request codes
                        Intent data = result.getData();
                        doSomeOperations();
                    }
                }
            });

    public void openSomeActivityForResult() {
        Intent intent = new Intent(this, SomeActivity.class);
        someActivityResultLauncher.launch(intent);
    }

我将其添加到我的源代码中。

            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
//            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

            ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
                    new ActivityResultContracts.StartActivityForResult(),
                    new ActivityResultCallback<ActivityResult>() {
                        @Override
                        public void onActivityResult(ActivityResult result) {
                            if (result.getResultCode() == Activity.RESULT_OK) {
                                // There are no request codes
                                Intent data = result.getData();
//                                doSomeOperations();
                            }
                        }
                    });

            someActivityResultLauncher.launch(enableBtIntent);

但是，Android 会自动为旧源代码请求蓝牙权限（我不必添加 onActivityResult 函数。因为它是早些时候在后台编写的）。但是，当我使用 ActivityResultLauncher 时，我必须添加 onActivityResult 函数（我也可以在没有 onActivityResult 的情况下工作，但是，startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);我也发送了一个整数值REQUEST_ENABLE_BT=1）。如何使用新代码请求蓝牙权限？

Answer 1

100%工作解决方案

清单代码：

   <!--BLUETOOTH PERMISSION-->
    <!-- Request legacy Bluetooth permissions on older devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <!-- Needed only if your app looks for Bluetooth devices.
             If your app doesn't use Bluetooth scan results to derive physical
             location information, you can strongly assert that your app
             doesn't derive physical location. -->
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <!-- Needed only if your app makes the device discoverable to Bluetooth
      devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <!-- Needed only if your app communicates with already-paired Bluetooth
           devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <!--bibo01 : hardware option-->
    <uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
    <uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/>

科特林代码：

 //check android12+
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                            requestMultiplePermissions.launch(arrayOf(
                                Manifest.permission.BLUETOOTH_SCAN,
                                Manifest.permission.BLUETOOTH_CONNECT))
                        }
                        else{
                            val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
                            requestBluetooth.launch(enableBtIntent)
                        }
....................................................

private var requestBluetooth = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
                if (result.resultCode == RESULT_OK) {
                    //granted
                }else{
                    //deny
                }
 }

private val requestMultiplePermissions =
                registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->
                    permissions.entries.forEach {
                        Log.d("test006", "${it.key} = ${it.value}")
                    }
}

了解更多： https ://developer.android.com/guide/topics/connectivity/bluetooth/permissions