Android :从startActivityForResult更改为registerForActivityResult

Question

对于此蓝牙活动，我将如何从startActivityForResult更改为registerForActivityResult？请帮助我，因为我是新的java和Android。我试过看视频和教程，但我只得到了更多的错误。如果你能给我任何建议，我将不胜感激。

        //on btn click
        mOnBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!mBlueAdapter.isEnabled()){
                    showToast("Turning On Bluetooth...");
                    //intent to on bluetooth
                    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    startActivityForResult(intent, REQUEST_ENABLE_BT);
                }
                else {
                    showToast("Bluetooth is already on");
                }
            }
        });

Answer 1

private val launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result: ActivityResult ->
    if (result.resultCode == Activity.RESULT_OK) {
    
    }
}

launcher.launch(intent)

Answer 2

对于那些在中需要服务的人，可以使用

private ActivityResultLauncher<Intent> startForResult =
        registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), result -> {

        });


startForResult.launch(intent);