我正在使用自定义的相机活动，并在列表视图活动中加载捕获的图像。加载功能仅在我切换到自定义相机之前才可用，它可以与现有的相机应用程序一起正常工作。
cameraActivity.java
public class custom_camera extends Activity {
private Camera mCamera;
private custom_camera_preview mPreview;
private PictureCallback mPicture;
private ImageButton capture;
private ImageButton switchCamera;
private Context myContext;
private LinearLayout cameraPreview;
private boolean cameraFront = false;
private Uri mCapturedImageURI;
LayoutInflater controlInflater = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_main);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LinearLayout.LayoutParams layoutParamsControl = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
myContext = this;
initialize();
}
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
cameraId = i;
cameraFront = true;
break;
}
}
return cameraId;
}
private int findBackFacingCamera() {
int cameraId = -1;
//Search for the back facing camera
//get the number of cameras
int numberOfCameras = Camera.getNumberOfCameras();
//for every camera check
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
cameraId = i;
cameraFront = false;
break;
}
}
return cameraId;
}
public void onResume() {
super.onResume();
if (!hasCamera(myContext)) {
Toast toast = Toast.makeText(myContext, "Sorry, your phone does not have a camera!", Toast.LENGTH_LONG);
toast.show();
finish();
}
if (mCamera == null) {
//if the front facing camera does not exist
if (findFrontFacingCamera() < 0) {
Toast.makeText(this, "No front facing camera found.", Toast.LENGTH_LONG).show();
switchCamera.setVisibility(View.GONE);
}
mCamera = Camera.open(findBackFacingCamera());
mCamera.setDisplayOrientation(90);
mPicture = getPictureCallback();
mPreview.refreshCamera(mCamera);
}
}
public void initialize() {
cameraPreview = (LinearLayout) findViewById(R.id.camera_preview);
mPreview = new custom_camera_preview(myContext, mCamera);
cameraPreview.addView(mPreview);
capture = (ImageButton) findViewById(R.id.takepicture);
capture.setOnClickListener(captrureListener);
switchCamera = (ImageButton) findViewById(R.id.button_ChangeCamera);
switchCamera.setOnClickListener(switchCameraListener);
}
View.OnClickListener switchCameraListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
//get the number of cameras
int camerasNumber = Camera.getNumberOfCameras();
if (camerasNumber > 1) {
//release the old camera instance
//switch camera, from the front and the back and vice versa
releaseCamera();
chooseCamera();
} else {
Toast toast = Toast.makeText(myContext, "Sorry, your phone has only one camera!", Toast.LENGTH_LONG);
toast.show();
}
}
};
public void chooseCamera() {
//if the camera preview is the front
if (cameraFront) {
int cameraId = findBackFacingCamera();
if (cameraId >= 0) {
//open the backFacingCamera
//set a picture callback
//refresh the preview
mCamera = Camera.open(cameraId);
mCamera.setDisplayOrientation(90);
mPicture = getPictureCallback();
mPreview.refreshCamera(mCamera);
}
} else {
int cameraId = findFrontFacingCamera();
if (cameraId >= 0) {
//open the frontFacingCamera
//set a picture callback
//refresh the preview
mCamera = Camera.open(cameraId);
mCamera.setDisplayOrientation(90);
mPicture = getPictureCallback();
mPreview.refreshCamera(mCamera);
}
}
}
@Override
protected void onPause() {
super.onPause();
//when on Pause, release camera in order to be used from other applications
releaseCamera();
}
private boolean hasCamera(Context context) {
//check if the device has camera
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
return true;
} else {
return false;
}
}
private PictureCallback getPictureCallback() {
PictureCallback picture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
//make a new picture file
File pictureFile = getOutputMediaFile();
if (pictureFile == null) {
return;
}
try {
//write the file
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Toast toast = Toast.makeText(myContext, "Picture saved: " + pictureFile.getName(), Toast.LENGTH_LONG);
toast.show();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
//refresh camera to continue preview
mPreview.refreshCamera(mCamera);
Intent i = new Intent(getApplicationContext(),listview_page.class);
startActivity(i);
}
};
return picture;
}
View.OnClickListener captrureListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(null, null, mPicture);
}
};
//make picture and save to a folder
private static File getOutputMediaFile() {
//make a new file directory inside the "sdcard" folder
File mediaStorageDir = new File("/sdcard/", "JCG Camera");
//if this "JCGCamera folder does not exist
if (!mediaStorageDir.exists()) {
//if you cannot make this folder return
if (!mediaStorageDir.mkdirs()) {
return null;
}
}
//take the current timeStamp
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
//and make a media file:
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
return mediaFile;
}
private void releaseCamera() {
// stop and release camera
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
}
listview.java
public class listview_page extends Activity{
private ArrayList<MyImage> images;
private ImageAdapter imageAdapter;
private ListView listView;
private Uri mCapturedImageURI;
private static final int RESULT_LOAD_IMAGE = 1;
private static final int REQUEST_IMAGE_CAPTURE = 2;
private DAOdb daOdb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_main);
// Construct the data source
images = new ArrayList();
// Create the adapter to convert the array to views
imageAdapter = new ImageAdapter(this, images);
// Attach the adapter to a ListView
listView = (ListView) findViewById(R.id.main_list_view);
listView.setAdapter(imageAdapter);
addItemClickListener(listView);
initDB();
}
/**
* initialize database
*/
private void initDB() {
daOdb = new DAOdb(this);
// add images from database to images ArrayList
for (MyImage mi : daOdb.getImages()) {
images.add(mi);
}
}
public void btnAddOnClick(View view) {
final Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.custom_dialog_box);
dialog.setTitle("iTongue");
dialog.findViewById(R.id.btnChoosePath).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
activeGallery();
}
});
dialog.findViewById(R.id.btnTakePhoto).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
activeTakePhoto();
Intent i = new Intent(getApplicationContext(),custom_camera.class);
startActivity(i);
}
});
// show dialog on screen
dialog.show();
}
/**
* take a photo
*/
private void activeTakePhoto() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
String fileName = "temp.jpg";
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
mCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
/**
* to gallery
*/
private void activeGallery() {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, RESULT_LOAD_IMAGE);
}
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_LOAD_IMAGE:
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]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
MyImage image = new MyImage();
image.setTitle("Tongue Image");
image.setDescription("test choose a photo from gallery and add it to " + "list view");
image.setDatetime(System.currentTimeMillis());
image.setPath(picturePath);
images.add(image);
daOdb.addImage(image);
}
case REQUEST_IMAGE_CAPTURE:
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(mCapturedImageURI, projection, null, null, null);
int column_index_data = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String picturePath = cursor.getString(column_index_data);
MyImage image = new MyImage();
image.setTitle("Tongue Image");
image.setDescription("test take a photo and add it to list view");
image.setDatetime(System.currentTimeMillis());
image.setPath(picturePath);
images.add(image);
daOdb.addImage(image);
}
}
}
/**
* item clicked listener used to implement the react action when an item is
* clicked.
*
* @param listView
*/
private void addItemClickListener(final ListView listView) {
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
MyImage image = (MyImage) listView.getItemAtPosition(position);
Intent intent = new Intent(getBaseContext(), DisplayImage.class);
intent.putExtra("IMAGE", (new Gson()).toJson(image));
startActivity(intent);
}
});
}
@Override protected void onSaveInstanceState(Bundle outState) {
// Save the user's current game state
if (mCapturedImageURI != null) {
outState.putString("mCapturedImageURI", mCapturedImageURI.toString());
}
// Always call the superclass so it can save the view hierarchy state
super.onSaveInstanceState(outState);
}
@Override protected void onRestoreInstanceState(Bundle savedInstanceState) {
// Always call the superclass so it can restore the view hierarchy
super.onRestoreInstanceState(savedInstanceState);
// Restore state members from saved instance
if (savedInstanceState.containsKey("mCapturedImageURI")) {
mCapturedImageURI = Uri.parse(savedInstanceState.getString("mCapturedImageURI"));
}
}
}
我第一次发帖提问，对于大量的代码感到抱歉。
答案 0 :(得分：0)
您可以按照以下方式执行此操作
第一种方式：根据请求创建Application类并保存set和get 你记得你必须在menifest文件中定义它，如
第二种方式：制作界面类
第三种方式：制作静态物体