java - 安卓工作室 : change from startActivityForResult to registerForActivityResult

Question

如何将此蓝牙 Activity 从 startActivityForResult 更改为 registerForActivityResult？请帮助我，因为我是 java 和 Android Studio 的新手。我曾尝试观看视频和教程，但只会收到更多错误。如果您能给我任何提示，我们将不胜感激。

        //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)