所以，我有一个活动（比如OneActivity），它调用另一个活动来获得这样的结果
public class OneActivity extends Activity {
private static final int REQUEST_OTHER = 1;
private ImageView btnStartAction;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstaceState);
setContentView(R.layout.homeView);
// UI Component Initialization.
}
// some code.
public void btnActionHandleClick(View v) {
Intent intent = new Intent(getApplicationContext(), OtherActivity.class);
intent.putExtra("parameter", "someValue");
startActivityForResult(intent, REQUEST_OTHER);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_OTHER) {
// do something.
}
}
}
另一方面，我有这个具有相机功能的句柄的 OtherActivity，并且由于请求了地图处理，我添加了地图处理。在地图特色请求之前，其他活动与相机功能完美配合。
public class OtherActivity : FragmentActivity {
private static final int REQUEST_CAMERA = 1;
private ImageView btnTakePicture;
private ImageView btnClose;
private ImageView mImageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.galeryView);
// UI Component Initialization.
mImageView = (ImageView) findViewById(R.id.mImageView);
}
public void btnTakePictureHandleClick(View v) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_CAMERA);
}
}
public void btnCloseHandleClick(View v) {
Intent intent = new Intent();
intent.putExtra("returnVale", "returnValue");
if (getParent() == null) {
setResult(Activity.RESULT_OK, intent);
} else {
getParent().setResult(Activity.RESULT_OK, intent);
}
finish();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_CAMERA && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
mImageView.setImageBitmap(imageBitmap);
}
}
}
就像我之前说的，这段代码运行良好，但是自从我向应用程序添加了地图交互以来，我在拍照时开始注意到一些奇怪的行为：它启动了ACTION_IMAGE_CAPTURE意图，但在我拍照后，它从 OneActivity 类返回到 onActivityResult 结果代码 = RESULT_CANCELED。顺便说一下，地图工作正常，并且具有正确的交互:P以前有没有人注意到过这样的行为？可能是导致这种情况的地图？
任何意见将不胜感激。提前感谢！
我建议自己做相机活动。这样，您就不必担心制造不同的实现。当三星使用相机更改他们的onActivityResult实现时，我对此感到愤怒。
这是我创建的相机活动：
public class DTechCameraActivity extends Activity implements OnClickListener {
//declare needed layout variables
private FrameLayout mCameraPreviewLayout;
private ImageView mCaputeredBitmapImageView;
private Button mCaptureImageButton, mRetakeImageButton, mSaveImageButton, mCancelImageButton;
//declare needed variables
private Camera mCamera;
private CameraPreview mPreview;
private String mBitmapSaveFileLocation;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dtech_camera);
//Create an instance of Camera
mCamera = CameraHelper.getCameraInstance();
//Get file location to save
mBitmapSaveFileLocation = getIntent().getExtras().getString(DCGroupActivity.CAMERA_DATA);
//Create and all click listeners for camera buttons
mCaptureImageButton = (Button) findViewById(R.id.camera_button_capture);
mCaptureImageButton.setOnClickListener(this);
mCaputeredBitmapImageView = (ImageView) findViewById(R.id.camera_image_holder);
mRetakeImageButton = (Button) findViewById(R.id.camera_button_retake);
mRetakeImageButton.setOnClickListener(this);
mSaveImageButton = (Button) findViewById(R.id.camera_button_save);
mSaveImageButton.setOnClickListener(this);
mCancelImageButton = (Button) findViewById(R.id.camera_button_cancel);
mCancelImageButton.setOnClickListener(this);
//Create our camera preview view and set as main activity view
mPreview = new CameraPreview(this, mCamera);
mCameraPreviewLayout = (FrameLayout) findViewById(R.id.camera_preview);
mCameraPreviewLayout.addView(mPreview);
showImageCaptureControls();
}
@Override
public void onBackPressed() {
closeDownCameraAndReturnResult(false);
}
@Override
public void onClick(View view) {
switch(view.getId()) {
case R.id.camera_button_capture:
mCamera.autoFocus(mAutoFocusCallback);
break;
case R.id.camera_button_retake:
showImageCaptureControls();
break;
case R.id.camera_button_save:
closeDownCameraAndReturnResult(true);
break;
case R.id.camera_button_cancel:
closeDownCameraAndReturnResult(false);
break;
}
}
private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
showCapturedImageControls(data);
};
};
private AutoFocusCallback mAutoFocusCallback = new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
mCamera.takePicture(null, null, mPicture);
}
};
private void showCapturedImageControls(byte[] imageBitmapData) {
mCamera.stopPreview();
mCameraPreviewLayout.setVisibility(View.GONE);
mCaptureImageButton.setVisibility(View.GONE);
mCaputeredBitmapImageView.setVisibility(View.VISIBLE);
mRetakeImageButton.setVisibility(View.VISIBLE);
mSaveImageButton.setVisibility(View.VISIBLE);
mCancelImageButton.setVisibility(View.VISIBLE);
saveImageToFile(imageBitmapData);
mCaputeredBitmapImageView.setImageBitmap(ImageManipulator.convertFileToBitmap(mBitmapSaveFileLocation));
}
private void saveImageToFile(byte[] imageBitmapData) {
ImageManipulator.saveInitialBitmap(imageBitmapData, mBitmapSaveFileLocation);
int angle = 90;//ImageManipulator.getTakenImageAngle(mBitmapSaveFileLocation);
if (angle > 0)
ImageManipulator.rotateAndSaveImage(mBitmapSaveFileLocation, angle);
else
ImageManipulator.saveReducedImage(mBitmapSaveFileLocation, BitmapFactory.decodeFile(mBitmapSaveFileLocation), true);
}
private void showImageCaptureControls() {
mCaputeredBitmapImageView.setVisibility(View.GONE);
mRetakeImageButton.setVisibility(View.GONE);
mSaveImageButton.setVisibility(View.GONE);
mCancelImageButton.setVisibility(View.GONE);
mCameraPreviewLayout.setVisibility(View.VISIBLE);
mCaptureImageButton.setVisibility(View.VISIBLE);
mCamera.startPreview();
}
private void closeDownCameraAndReturnResult(boolean actionSaveImage) {
mCamera.release();
if(!actionSaveImage)
setResult(RESULT_CANCELED);
else
setResult(RESULT_OK, new Intent());
this.finish();
}
}
我是这样称呼它的：
mDTech.getSelectedEquipment().setImageDesc(
mEquipmentDescription.getText().toString());
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, getImageUri());
startActivityForResult(cameraIntent, DTechMobileApplication.CAMERA_REQUEST);
这是我的活动结果代码：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK
&& requestCode == DTechMobileApplication.CAMERA_REQUEST) {
String imageLocation = Environment.getExternalStorageDirectory()
.getAbsolutePath() + getImageLocation();
int angle = ImageManipulator.getTakenImageAngle(imageLocation);
if (angle > 0)
ImageManipulator.rotateAndSaveImage(imageLocation, angle);
else
ImageManipulator.saveReducedImage(imageLocation,
BitmapFactory.decodeFile(imageLocation), true);
saveEquipmentImageToPhone(mDTech.getSelectedEquipment()
.getImageID(), mDTech.getSelectedEquipment()
.getEquipmentID(), imageLocation, mDTech
.getSelectedJob().getJobID(), mDTech
.getAccessingEmployee().getTechID(), mDTech
.getAccessingEmployee().getName(), mDTech
.getSelectedEquipment().getEquipmentNum(), mDTech
.getSelectedEquipment().getDescription());
mTestImageUpload = SHOULD_UPLOAD_IMAGE;
}
}
这是相机助手：
package com.Utilities;
import android.hardware.Camera;
public class CameraHelper {
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
}
这是相机预览：
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
//declare needed constants
private final String CLASS_NAME = getClass().getName();
//declare needed variables
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.setDisplayOrientation(90);
} catch (IOException e) {
Log.d(CLASS_NAME, "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d(CLASS_NAME, "Error starting camera preview: " + e.getMessage());
}
}
}
好吧，事实证明，其中一个视图（布局）应该设置@android:noHistory=true标志，但我没有将该配置放入错误的布局中，而不是正确的布局。由于布局将 noHistory 标志设置为 true，因此它永远不会返回到onActivityResult但会返回到上一个活动。所以，它不是谷歌地图API，也不是相机功能......这是我的错误:(