我正在使用相机2 API来创建自己的相机。我想将摄像机拍摄的图像设置为ImageView，这是另一项活动。我试过这段代码，但它无法正常工作。单击相机按钮时，照片将保存到SD卡位置，但它未显示在第三个活动中的ImageView上（应该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。任何人都可以帮助我吗？
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();
}
}
方法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);
}
}
}
}}
答案 0 :(得分：0)
在课程部分
中添加此行final int TAKE_PHOTO_REQ = 100;
ImageView imageView;
在调用方法中添加这两行
imageView = (ImageView)findViewById(R.id.iv);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, TAKE_PHOTO_REQ);
添加此
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case TAKE_PHOTO_REQU: {
if (resultCode == TakePicture.RESULT_OK && data != null) {
Bitmap myBmp = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(myBmp);
}
}
}
}
希望这会有所帮助..谢谢
答案 1 :(得分：0)
我认为你应该像这样传递位图：
Intent intent = new Intent(this, ThirdActivity.class);
intent.putExtra("BitmapImage", photo);
然后在第三个活动中将其作为可分配的数据接收：
Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("BitmapImage");
然后只需将位图设置为ImageView
imageView.setImageBitmap(bitmap);
希望这可以帮到你:)如果你有任何例外，请写下
答案 2 :(得分：0)
这是代码试试吧
这是我的xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/linear">
<Button android:id="@+id/btn" android:layout_width="200dp"
android:layout_height="wrap_content" android:text="Click" />
<ImageView android:id="@+id/img_preview"
android:layout_width="fill_parent" android:layout_height="fill_parent"/>
</LinearLayout>
这是活动代码
Button btn;
int CAMERA_PIC_REQUEST = 0;
ImageView imgView;
imgView = (ImageView) findViewById(R.id.img_preview);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent camera_intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(camera_intent, CAMERA_PIC_REQUEST);
}
});
这里是onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode){
case CAMERA_PIC_REQUEST:
if(resultCode==RESULT_OK){
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
imgView.setImageBitmap(thumbnail);
}
}
}