如何将相机拍摄的图像设置为ImageView? [英] How to set an image taken by the camera in to an ImageView?
本文介绍了如何将相机拍摄的图像设置为ImageView?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用相机2 API创建自己的相机.我想将相机拍摄的图像设置为ImageView，这是另一项活动.我已经尝试过此代码，但无法正常工作.单击相机按钮时，照片将保存到sdcard位置，但不会显示在第三个活动的ImageView中(该活动应接收图像并将其设置为ImageView).我通过Intent将图像作为位图对象传递.谁能帮我吗?
I am using camera 2 API for creating my own camera. I want to set the image taken by the camera in to an ImageView, which is on another activity. I have tried this code but it is not working. When clicking the camera button the photo is saved to an sdcard location, but it is not showing on the ImageView in the third Activity (which should receive the image and set it to an ImageView). I am passing the image as bitmap object via an Intent. Can anyone help me?
相机活动
public class SecondActivity extends Activity {
ImageButton imagebutton;
private static int RESULT_LOAD_IMAGE = 1;
private final static String TAG = "Camera2testJ";
private Size mPreviewSize;
private static final int CAMERA_REQUEST = 1888;
private TextureView mTextureView;
private CameraDevice mCameraDevice;
private CaptureRequest.Builder mPreviewBuilder;
private CameraCaptureSession mPreviewSession;
private Button cancelbtn;
private ImageButton mBtnShot;
public String picturePath;
public Bitmap photo;
int flag=1;
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_second);
loadPic();
mTextureView = (TextureView)findViewById(R.id.texture);
mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
mBtnShot = (ImageButton)findViewById(R.id.btn_takepicture);
mBtnShot.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.e(TAG, "mBtnShot clicked");
takePicture();
//sendImage(flag=0);
}
});
imagebutton=(ImageButton)findViewById(R.id.buttonLoadPicture2);
imagebutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
cancelbtn=(Button)findViewById(R.id.buttonLoadPicture3);
cancelbtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
protected void takePicture() {
Log.e(TAG, "takePicture");
if(null == mCameraDevice) {
Log.e(TAG, "mCameraDevice is null, return");
return;
}
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraDevice.getId());
Size[] jpegSizes = null;
if (characteristics != null) {
jpegSizes = characteristics
.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
.getOutputSizes(ImageFormat.JPEG);
}
int width = 640;
int height = 480;
if (jpegSizes != null && 0 < jpegSizes.length) {
width = jpegSizes[0].getWidth();
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);
// Orientation
int rotation = getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
final File file = new File(Environment.getExternalStorageDirectory()+"/DCIM", "pic.jpg");
ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader reader) {
Image image = null;
try {
image = reader.acquireLatestImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
save(bytes);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (image != null) {
image.close();
}
}
}
private void save(byte[] bytes) throws IOException {
OutputStream output = null;
try {
output = new FileOutputStream(file);
output.write(bytes);
} finally {
if (null != output) {
output.close();
}
}
}
};
HandlerThread thread = new HandlerThread("CameraPicture");
thread.start();
final Handler backgroudHandler = new Handler(thread.getLooper());
reader.setOnImageAvailableListener(readerListener, backgroudHandler);
final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(CameraCaptureSession session,
CaptureRequest request, TotalCaptureResult result) {
super.onCaptureCompleted(session, request, result);
Toast.makeText(SecondActivity.this, "Saved:"+file, Toast.LENGTH_SHORT).show();
////////////sending image
/* flag=flag-1;
sendImage(flag);*/
// startPreview();
/////sending image
}
};
mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
try {
session.capture(captureBuilder.build(), captureListener, backgroudHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
}
}, backgroudHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
Log.e(TAG, "onResume");
}
private void openCamera() {
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
Log.e(TAG, "openCamera E");
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(TAG, "openCamera X");
}
private TextureView.SurfaceTextureListener mSurfaceTextureListener = new TextureView.SurfaceTextureListener(){
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
Log.e(TAG, "onSurfaceTextureAvailable, width="+width+",height="+height);
openCamera();
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface,
int width, int height) {
Log.e(TAG, "onSurfaceTextureSizeChanged");
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
//Log.e(TAG, "onSurfaceTextureUpdated");
}
};
private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
Log.e(TAG, "onOpened");
mCameraDevice = camera;
startPreview();
}
@Override
public void onDisconnected(CameraDevice camera) {
Log.e(TAG, "onDisconnected");
}
@Override
public void onError(CameraDevice camera, int error) {
Log.e(TAG, "onError");
}
};
@Override
protected void onPause() {
Log.e(TAG, "onPause");
super.onPause();
if (null != mCameraDevice) {
mCameraDevice.close();
mCameraDevice = null;
}
}
protected void startPreview() {
if(null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) {
Log.e(TAG, "startPreview fail, return");
return;
}
SurfaceTexture texture = mTextureView.getSurfaceTexture();
if(null == texture) {
Log.e(TAG,"texture is null, return");
return;
}
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(SecondActivity.this, "onConfigureFailed", Toast.LENGTH_LONG).show();
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
protected void updatePreview() {
if(null == mCameraDevice) {
Log.e(TAG, "updatePreview error, return");
}
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();
}
}
onActivityResult方法
Method onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
flag=flag+1;
/* ImageView imageView = (ImageView) findViewById(R.id.imgView2);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));*/
sendImage(flag);
}
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
photo = (Bitmap) extras.get("data");
flag=flag-1;
sendImage(flag);
/* photo = (Bitmap) data.getExtras().get("data");*/
// imageView.setImageBitmap(photo);
}
}
public void sendImage(int flag)
{
// id=flag;
if(flag==2) {
Intent myIntent1 = new Intent(SecondActivity.this, ThirdActivity.class);
myIntent1.putExtra("key", picturePath);
// myIntent1.putExtra("key2",
SecondActivity.this.startActivity(myIntent1);
}
if(flag==0)
{
Intent myIntent1 = new Intent(SecondActivity.this, ThirdActivity.class);
myIntent1.putExtra("key", photo);
// myIntent1.putExtra("key2",
SecondActivity.this.startActivity(myIntent1);
}
}
void loadPic()
{
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String pathName = baseDir + "/DCIM/camera/";
File parentDir=new File(pathName);
File[] files = parentDir.listFiles();
Date lastDate = null;
String lastFileName;
boolean isFirstFile = true; //just temp variable for being sure that we are on the first file
for (File file : files) {
if(isFirstFile){
lastDate = new Date(file.lastModified());
isFirstFile = false;
}
if(file.getName().endsWith(".jpg") || file.getName().endsWith(".jpeg")){
Date lastModDate = new Date(file.lastModified());
if (lastModDate.after(lastDate)) {
lastDate = lastModDate;
lastFileName = file.getName();
// String baseDir2 = Environment.getExternalStorageDirectory().getAbsolutePath();
//String fileName = lastFileName;
String pathName2 = pathName +lastFileName;//maybe your folders are /DCIM/camera/
Bitmap bmp = BitmapFactory.decodeFile(pathName2);
ImageButton button1 = (ImageButton)findViewById(R.id.buttonLoadPicture2);
button1.setImageBitmap(bmp);
}
}
}
}}
推荐答案
我认为您应该像这样传递位图:
I think that you should pass the bitmap like this:
Intent intent = new Intent(this, ThirdActivity.class);
intent.putExtra("BitmapImage", photo);
，然后在您的第三项活动中将其作为可打包的数据接收:
and then receive it as parcelable data like this in your third activity:
Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");
，然后将位图设置为ImageView
imageView.setImageBitmap(bitmap);
希望这对您有帮助:)如果有任何例外情况，请写出
Hopefully this helps you :) Write if you have any exceptions
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