Android 如何显示从相机拍摄的图像

我正在尝试编写一个android应用程序，它可以与摄像头配合使用。 我在textureview中显示相机的预览，它正在工作。如果按下按钮，相机将拍摄一张照片并显示在屏幕后半部分的imageview上。 但每次我按下按钮，我的应用程序停止工作，它就会告诉我错误

android.view.ViewRootImpl$CalledFromErrorThreadException:只有 创建视图层次结构的原始线程可以接触其视图

所以我查了一下，似乎我无法在尝试更改imageview的图像时更改它。但我不知道我还能怎样解决我的问题。你能给我一些建议吗？这是我的代码：在takePicture（）方法的“ImageReader.OnImageAvailableListener”中更改图像

公共类MainActivityOld扩展活动{
私有纹理视图mTextureView；
私有图像视图mImageView；
私人摄像设备；
私人规模的mPreviewSize；
私人CaptureRequest.Builder mPreviewBuilder；
私人摄像机拍摄会议回顾；
私人按钮；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
//没有标题栏
requestWindowFeature（窗口。功能\u无\u标题）；
getWindow（）.setFlags（WindowManager.LayoutParams.FLAG_全屏，WindowManager.LayoutParams.FLAG_全屏）；
setContentView（R.layout.activity_main）；
mTextureView=（TextureView）findViewById（R.id.texture）；
mTextureView.setSurfaceTextureListener（mSurfaceListener）；
mImageView=（ImageView）findViewById（R.id.lastPicture）；
mBtnShot=（按钮）findviewbyd（R.id.btn_takepicture）；
mBtnShot.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
拍摄照片（）；
}
});
}
私人照片{
Log.e（“MyTag”、“拍照”）；
CameraManager=（CameraManager）getSystemService（Context.CAMERA_服务）；
试一试{
CameraCharacteristics characteristics=manager.getCameraCharacteristics（mCameraDevice.getId（））；
Size[]jpegsize=characteristics.get（CameraCharacteristics.SCALER\u STREAM\u CONFIGURATION\u MAP）.getOutputSizes（ImageFormat.JPEG）；
int-width=jpegSizes[0]。getWidth（）；
int height=jpegSizes[0]。getHeight（）；
ImageReader=ImageReader.newInstance（宽度、高度、ImageFormat.JPEG，1）；
List outputSurfaces=新的ArrayList（2）；
add（reader.getSurface（））；
添加（新表面（mTextureView.getSurfaceTexture（））；
final CaptureRequest.Builder captureBuilder=mCameraDevice.createCaptureRequest（CameraDevice.TEMPLATE\u STILL\u CAPTURE）；
addTarget（reader.getSurface（））；
captureBuilder.set（CaptureRequest.CONTROL_模式，CameraMetadata.CONTROL_模式自动）；
ImageReader.OnImageAvailableListener readerListener=新建ImageReader.OnImageAvailableListener（）{
@凌驾
公共图像可用（图像阅读器）{
Image=reader.acquiredlatestimage（）；
ByteBuffer buffer=image.getPlanes（）[0].getBuffer（）；
字节[]字节=新字节[buffer.capacity（）]；
buffer.get（字节）；
位图位图=位图工厂.decodeByteArray（字节，0，字节.长度）；
设置图像位图（位图）；
}
};
HandlerThread线程=新HandlerThread（“CameraPicture”）；
thread.start（）；
final Handler backgroundHandler=新处理程序（thread.getLooper（））；
setOnImageAvailableListener（readerListener，backgroundHandler）；
final CameraCaptureSession.CaptureCallback captureListener=新建CameraCaptureSession.CaptureCallback（）{
@凌驾
捕获完成后的公共void（CameraCaptureSession会话、CaptureRequest请求、TotalCaptureResult）{
super.onCaptureCompleted（会话、请求、结果）；
startPreview（）；
}
};
mCameraDevice.createCaptureSession（outputSurfaces，新的CameraCaptureSession.StateCallback（）{
@凌驾
未配置公共void（CameraCaptureSession会话）{
试一试{
capture（captureBuilder.build（），captureListener，backgroundHandler）；
}捕获（CameraAccessE异常）{
e、 printStackTrace（）；
}
}
@凌驾
配置文件的公共无效（CameraCaptureSession）{
}
}，背景处理程序）；
}捕获（CameraAccessE异常）{
e、 printStackTrace（）；
}
}
私有void openCamera（）{
CameraManager=（CameraManager）getSystemService（Context.CAMERA_服务）；
试一试{
字符串cameraId=manager.getCameraIdList（）[0]；
CameraCharacteristics characteristics=manager.getCameraCharacteristics（cameraId）；
StreamConfigurationMap=characteristics.get（CameraCharacteristics.SCALER\u STREAM\u CONFIGURATION\u map）；
mPreviewSize=map.getOutputSizes（SurfaceTexture.class）[0]；
manager.openCamera（cameraId，mStateCallback，null）；
}捕获（CameraAccessE异常）{
e、 printStackTrace（）；
}
Log.e（“MyTag”、“openCamera”）；
}
私有TextureView.SurfaceTextRelistener mSurfaceListener=新TextureView.SurfaceTextRelistener（）{
@凌驾
SurfaceTextureAvailable上的公共空心（SurfaceTexture曲面、整型宽度、整型高度）{
Log.e（“myLog”、“onSurfaceTextureAvailable、，
public class MainActivityOld extends Activity {

    private TextureView mTextureView;
    private ImageView mImageView;
    private CameraDevice mCameraDevice;
    private Size mPreviewSize;
    private CaptureRequest.Builder mPreviewBuilder;
    private CameraCaptureSession mPreviewSession;

    private Button mBtnShot;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //no titlebar
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        mTextureView = (TextureView) findViewById(R.id.texture);
        mTextureView.setSurfaceTextureListener(mSurfaceListener);

        mImageView = (ImageView) findViewById(R.id.lastPicture);

        mBtnShot = (Button) findViewById(R.id.btn_takepicture);
        mBtnShot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                takePicture();
            }
        });
    }

    private void takePicture() {
        Log.e("MyTag", "Take picture");
        CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

        try {
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraDevice.getId());
            Size[] jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes(ImageFormat.JPEG);
            int width = jpegSizes[0].getWidth();
            int height = jpegSizes[0].getHeight();

            ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);


            List<Surface> outputSurfaces = new ArrayList<Surface>(2);
            outputSurfaces.add(reader.getSurface());
            outputSurfaces.add(new Surface(mTextureView.getSurfaceTexture()));


            final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(reader.getSurface());
            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);

            ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener(){

                @Override
                public void onImageAvailable(ImageReader reader) {
                    Image image = reader.acquireLatestImage();
                    ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                    byte[] bytes = new byte[buffer.capacity()];
                    buffer.get(bytes);
                    Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                    mImageView.setImageBitmap(bitmap);
                }
            };


            HandlerThread thread = new HandlerThread("CameraPicture");
            thread.start();
            final Handler backgroundHandler = new Handler(thread.getLooper());
            reader.setOnImageAvailableListener(readerListener,backgroundHandler);

            final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {

                @Override
                public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);
                    startPreview();
                }
            };
            mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {

                @Override
                public void onConfigured(CameraCaptureSession session) {
                    try {
                        session.capture(captureBuilder.build(), captureListener, backgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(CameraCaptureSession session) {
                }
            }, backgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void openCamera() {
        CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        try {
            String cameraId = manager.getCameraIdList()[0];
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
            StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];

            manager.openCamera(cameraId, mStateCallback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
        Log.e("MyTag", "openCamera");
    }

    private TextureView.SurfaceTextureListener mSurfaceListener = new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
            Log.e("myLog", "onSurfaceTextureAvailable, width=" + width + ",height=" + height);
            openCamera();
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

        }

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            return false;
        }

        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surface) {

        }
    };

    private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {

        @Override
        public void onOpened(CameraDevice camera) {
            Log.e("myTag", "onOpened");
            mCameraDevice = camera;
            startPreview();
        }

        @Override
        public void onDisconnected(CameraDevice camera) {
            Log.e("myTag", "onDisconnected");
        }

        @Override
        public void onError(CameraDevice camera, int error) {
            Log.e("myTag", "onDisconnected");
        }
    };

    protected void startPreview() {
        if (mCameraDevice == null || mTextureView.isAvailable() || mPreviewSize == null) {
            Log.e("MyTag", "startPreview failed, still working, so just ignore it");
            // return;
        }
        SurfaceTexture texture = mTextureView.getSurfaceTexture();
        texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
        Surface surface = new Surface(texture);

        try {
            mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
        mPreviewBuilder.addTarget(surface);

        try {
            mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {

                @Override
                public void onConfigured(CameraCaptureSession session) {
                    mPreviewSession = session;
                    updatePreview();
                }

                @Override
                public void onConfigureFailed(CameraCaptureSession session) {
                    Toast.makeText(MainActivityOld.this, "onConfigureFailed", Toast.LENGTH_LONG).show();
                }
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    protected void updatePreview() {
        mPreviewBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
        HandlerThread thread = new HandlerThread("CameraPreview");
        thread.start();
        Handler backgroundHandler = new Handler(thread.getLooper());

        try {
            mPreviewSession.setRepeatingRequest(mPreviewBuilder.build(), null, backgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener(){
    @Override
    public void onImageAvailable(final ImageReader reader) {
        MainActivityOld.this.runOnUIThread(new Runnable() {
            @Override
            public void run() {
                Image image = reader.acquireLatestImage();
                ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                byte[] bytes = new byte[buffer.capacity()];
                buffer.get(bytes);
                Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                mImageView.setImageBitmap(bitmap);
            }
        });
    }
};