java - 使用我的 DicomViewer 在 java 中启动新 Activity 导致 Android Studio 崩溃

Question

在 RoomDetailFragment.kt 中，我已经将活动传递给了 java 文件，并尝试使用手机中的 URI“Dicom-path”传递它。没有错误但我不知道如何通过它可能是另一种方式？所以我想intent.putExtra 把它交给我的java 类“dicomimageview.java”。它从onCreate的代码运行并一直工作到最后我的dicomimageview。它在这之后崩溃了，只是给我看了一个红色的矩形。在此之后，我在 dicomimageview 的 onCreate 中添加了新的 Intent。他甚至传递了文件路径，还是只是为了新活动而无法访问我的 dicompath？因为我需要为新活动获取代码protected void onActivityResult ( int requestCode, int resultCode, Intent data). 它将文件转换为图像并可以显示它。但它甚至无法启动活动，所以它只是向我显示了一个白屏，并没有转到 onActivityResult 的下一个活动。我希望有一个人可以帮助我。

更新问题现在他只给我看一张红色图片->我认为这是一个活动问题，但我必须学习如何在 dicomImageViewer.java 中创建一个新活动->仍然失败 在此处输入图像描述

RoomDetailFragment.kt

private fun startOpenFileIntent(action: RoomDetailViewEvents.OpenFile) {

       val uri1 = action.uri.toString()
       val dicom_ = ".DCM"
       if (action.mimeType == MimeTypes.Apk) {
           installApk(action)
       }

           else if (uri1.contains(dicom_)) {

           activity?.let {

               val intent2 = Intent(it, dicomImageView::class.java).apply {
                   addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_ACTIVITY_NEW_TASK)
                   setDataAndType(action.uri, dicom_)

               }
               startActivity(intent2)
           }
               }
   else {
               openFile(action)
           }
       }

dicomImageView.java

public class dicomImageView extends AppCompatActivity {
    // First thing: load the Imebra library
    private ImageView mImageView; // Used to display the image
    private TextView mTextView;  // Used to display the patient name

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        System.loadLibrary("imebra_lib");

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // We will use the ImageView widget to display the DICOM image
        mImageView = findViewById(R.id.imageView);
        mTextView = findViewById(R.id.textView);

        ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        // There are no request codes

                        Intent data1 = result.getData();
                        doSomeOperations(data1);
                    }
                });
    }

    public void doSomeOperations(Intent intent) {

        Uri selectedfile = intent.getData();

        CodecFactory.setMaximumImageSize(8000, 8000);
        InputStream stream = null;
        try {
            stream = getContentResolver().openInputStream(selectedfile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        // The usage of the Pipe allows to use also files on Google Drive or other providers
        PipeStream imebraPipe = new PipeStream(32000);

        // Launch a separate thread that read from the InputStream and pushes the data
        // to the Pipe.
        Thread pushThread = new Thread(new PushToImebraPipe(imebraPipe, stream));
        pushThread.start();

        // The CodecFactory will read from the Pipe which is feed by the thread launched
        // before. We could just pass a file name to it but this would limit what we
        // can read to only local files
        DataSet loadDataSet = CodecFactory.load(String.valueOf(intent));


        // Get the first frame from the dataset (after the proper modality transforms
        // have been applied).
        Image dicomImage = loadDataSet.getImageApplyModalityTransform(0);

        // Use a DrawBitmap to build a stream of bytes that can be handled by the
        // Android Bitmap class.
        TransformsChain chain = new TransformsChain();

        if (ColorTransformsFactory.isMonochrome(dicomImage.getColorSpace())) {
            VOILUT voilut = new VOILUT(VOILUT.getOptimalVOI(dicomImage, 0, 0, dicomImage.getWidth(), dicomImage.getHeight()));
            chain.addTransform(voilut);
        }
        DrawBitmap drawBitmap = new DrawBitmap(chain);
        Memory memory = drawBitmap.getBitmap(dicomImage, drawBitmapType_t.drawBitmapRGBA, 4);

        // Build the Android Bitmap from the raw bytes returned by DrawBitmap.
        Bitmap renderBitmap = Bitmap.createBitmap((int) dicomImage.getWidth(), (int) dicomImage.getHeight(), Bitmap.Config.ARGB_8888);
        byte[] memoryByte = new byte[(int) memory.size()];
        memory.data(memoryByte);
        ByteBuffer byteBuffer = ByteBuffer.wrap(memoryByte);
        renderBitmap.copyPixelsFromBuffer(byteBuffer);

        // Update the image
        mImageView.setImageBitmap(renderBitmap);
        mImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

        // Update the text with the patient name
        mTextView.setText(loadDataSet.getPatientName(new TagId(0x10, 0x10), 0, new PatientName("Undefined", "", "")).getAlphabeticRepresentation());

    }
}

activity_dicom_image_view.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".features.home.room.detail.dicomImageView">

    <LinearLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:layout_margin="0dp"
        android:gravity="center_vertical|fill_vertical|center_horizontal|fill_horizontal"
        android:orientation="vertical"
        android:padding="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_default="percent"
        app:layout_constraintHeight_percent="100"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_default="percent"
        app:layout_constraintWidth_percent="100">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="0dp"
        android:layout_weight="1"
        android:adjustViewBounds="false"
        android:contentDescription="@string/image_description"
        android:cropToPadding="false"
        android:padding="0dp"
        app:srcCompat="@color/colorprimary" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

同样在应用程序中，在 AndroidManifest.xml 中添加了活动

<application
        android:name=".VectorApplication"
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:networkSecurityConfig="@xml/network_security_config"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Vector.Light"
        tools:replace="android:allowBackup">
        <activity
            android:name=".features.home.room.detail.dicomImageView"
            android:exported="true" />
        <!-- No limit for screen ratio: avoid black strips -->
        <meta-data

标签： javaandroidkotlin

Answer 1

编辑：

同样在您被调用的活动中，您应该能够在 dicomImageView.java 的 onCreate 中使用 this 从调用活动中获取意图

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    Intent intent = getIntent();
    ...
}

看起来您的语法可能不正确。

尝试改变：

val intent = Intent(context,dicomImageView::class.java)
intent.putExtra("Dicomimage",neu[0])
startActivity(intent)
}

到：

val intent = Intent(context,dicomImageView::class.java).apply {
    putExtra("Dicomimage",neu[0])
}
startActivity(intent)

请参阅：https ://developer.android.com/training/basics/firstapp/starting-activity#BuildIntent