如何使用意图转到活动的片段页面

Question

这是我的活动函数（i）在扫描条形码后无法转到片段页面，我尝试它可以转到活动页面并显示代码成功，但我需要它转到fragment页面。

barcodeDetector.setProcessor(object : Detector.Processor<Barcode> {

        override fun release() {
            Toast.makeText(applicationContext, "Scanner has been closed", Toast.LENGTH_SHORT)
                .show()
        }

        override fun receiveDetections(detections: Detector.Detections<Barcode>) {
            val barcodes = detections.detectedItems
            if (barcodes.size() == 1) {
                scannedValue = barcodes.valueAt(0).rawValue
                runOnUiThread {
                    cameraSource.stop()
                    Toast.makeText(this@InsertStockInActivity, scannedValue, Toast.LENGTH_SHORT).show()
                    val i = Intent(this@InsertStockInActivity, comFragment::class.java)
                    .putExtra("cameraSource", scannedValue)
                    startActivity(i)
                    finish()
                }
            }else
            {
                Toast.makeText(this@InsertStockInActivity, "value- else", Toast.LENGTH_SHORT).show()

            }
        }

    })

这是我的碎片页面。我写错了吗？

 class comFragment : Fragment() {
       private lateinit var binding: FragmentComBinding
       private val nav by lazy { findNavController() }

       private val vm: StockInViewModel by activityViewModels()

       private val formatter = SimpleDateFormat("dd MMMM yyyy '-' hh:mm:ss a", Locale.getDefault())

       override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
       binding = FragmentComBinding.inflate(inflater, container, false)
       //binding.btnScanBarcode.setOnClickListener{ nav.navigate(R.id.insertStockInActivity) }

       val value = requireActivity().intent.getStringExtra("cameraSource")
       binding.edtId.findViewById<EditText>(R.id.value)

       return binding.root
   }

}

Answer 1

您使用意图导航到活动不fragment。

您可以：

1. 使用 fragment Transactions 导航到新的fragment fragment < /代码>在您的当前活动中

   


2. 使用意图来导航到新活动，在您的新活动中.com/guide/fragments/transactions“ rel =“ nofollow noreferrer”> fragment Transactions 到您的fragment

Answer 2

您需要创建一个扩展片段性并在那里开始片段的类：

public class MyFragmentActivity extends YourActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            if (savedInstanceState == null){
                getSupportFragmentManager().beginTransaction()
                        .add(android.R.id.content, new MyFragment ()).commit();}
        }
    }

然后片段构造函数：

public MyFragment() {
}

然后从您的调用活动中，以正常方式开始片段活动

   Intent i = new Intent(YourActivity.this, MyFragment.class);
    startActivity(i);