我创建了android项目。
在我的项目中，当我选择从相机选择的选项然后从中捕获图像并单击确定按钮时，图像将不会显示在ImageView中。
我知道问题是什么，但我不知道它的解决方案......
MainActivity.java
private void selectImage() {
final CharSequence[] option = { "Take Photo", "Choose from Gallery" };
AlertDialog.Builder builder = new AlertDialog.Builder(
User_Registration.this);
builder.setTitle("Add Photo!");
builder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.setItems(option, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (option[item].equals("Take Photo")) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File f = new File(android.os.Environment
.getExternalStorageDirectory(), imageFileName
+ ".jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(intent, 1);
} else if (option[item].equals("Choose from Gallery")) {
Intent intent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
}
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
File f = new File(Environment.getExternalStorageDirectory()
.toString());
for (File temp : f.listFiles()) {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
if (temp.getName().equals(imageFileName)) {
f = temp;
break;
}
}
try {
Bitmap bitmap;
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
image.setImageBitmap(bitmap);
String path = android.os.Environment
.getExternalStorageDirectory()
+ File.separator
+ "Phoenix" + File.separator + "default";
// f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System
.currentTimeMillis()) + ".jpg");
try {
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == 2) {
Uri selectedImage = data.getData();
String[] filePath = { MediaStore.Images.Media.DATA };
Cursor c = getContentResolver().query(selectedImage, filePath,
null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
String picturePath = c.getString(columnIndex);
c.close();
Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
Log.w("path of image from gallery......******************.........",
picturePath + "");
image.setImageBitmap(thumbnail);
}
}
}
我创建的图像名称取决于时间戳，但问题是：
如何检索图片以及如何在ImageView 中设置图片？
答案 0 :(得分：0)
Error came from here
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
When you call camera intent you call above `String` for image name:
String timeStamp = 21 jan 2015 06:00:00; //Some thing like this
String imageFileName = "JPEG_" + timeStamp + "_";
Now when `onActivityResult()` is called after clicking the image, you call again:
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String timeStamp= 21 jan 2015 06:00:15; //Some thing like this
String imageFileName = "JPEG_" + timeStamp + "_";
Check difference in both File name which is in Seconds..
Stored file name is : *JPEG_21 jan 2015 06:00:00.jpg*;
Your are trying to get a file named: *JPEG_21 jan 2015 06:00:10 .jpg*;
---------------------------------------------------------------------------
///what you can do is : Declare String imageFileName as Global static String
// onclick camera buttonCode
imageFileName = "JPEG_" + timeStamp + "_.jpg";
File f = new File(android.os.Environment.getExternalStorageDirectory(),imageFileName);
//on Activity code
for (File temp : f.listFiles()) {
//removethis line
// String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss") .format(new Date());
//removethis line
// String imageFileName = "JPEG_" + timeStamp + "_";
if (temp.getName().equals(imageFileName)) {
f = temp;
break;
}
}
答案 1 :(得分：0)
按照此代码..这将有所帮助
public class CameraPhotoCapture extends Activity {
final static int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1;
Uri imageUri = null;
static TextView imageDetails = null;
public static ImageView showImg = null;
CameraPhotoCapture CameraActivity = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera_photo_capture);
CameraActivity = this;
imageDetails = (TextView) findViewById(R.id.imageDetails);
showImg = (ImageView) findViewById(R.id.showImg);
final Button photo = (Button) findViewById(R.id.photo);
photo.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
/*************************** Camera Intent Start ************************/
// Define the file-name to save photo taken by Camera activity
String fileName = "Camera_Example.jpg";
// Create parameters for Intent with filename
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
values.put(MediaStore.Images.Media.DESCRIPTION,"Image capture by camera");
// imageUri is the current activity attribute, define and save it for later usage
imageUri = getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
/**** EXTERNAL_CONTENT_URI : style URI for the "primary" external storage volume. ****/
// Standard Intent action that can be sent to have the camera
// application capture an image and return it.
Intent intent = new Intent( MediaStore.ACTION_IMAGE_CAPTURE );
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
startActivityForResult( intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
/*************************** Camera Intent End ************************/
}
});
}
@Override
protected void onActivityResult( int requestCode, int resultCode, Intent data)
{
if ( requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if ( resultCode == RESULT_OK) {
/*********** Load Captured Image And Data Start ****************/
String imageId = convertImageUriToFile( imageUri,CameraActivity);
// Create and excecute AsyncTask to load capture image
new LoadImagesFromSDCard().execute(""+imageId);
/*********** Load Captured Image And Data End ****************/
} else if ( resultCode == RESULT_CANCELED) {
Toast.makeText(this, " Picture was not taken ", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, " Picture was not taken ", Toast.LENGTH_SHORT).show();
}
}
}
/************ Convert Image Uri path to physical path **************/
public static String convertImageUriToFile ( Uri imageUri, Activity activity ) {
Cursor cursor = null;
int imageID = 0;
try {
/*********** Which columns values want to get *******/
String [] proj={
MediaStore.Images.Media.DATA,
MediaStore.Images.Media._ID,
MediaStore.Images.Thumbnails._ID,
MediaStore.Images.ImageColumns.ORIENTATION
};
cursor = activity.managedQuery(
imageUri, // Get data for specific image URI
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null // Order-by clause (ascending by name)
);
// Get Query Data
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
int columnIndexThumb = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
int file_ColumnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
//int orientation_ColumnIndex = cursor.
// getColumnIndexOrThrow(MediaStore.Images.ImageColumns.ORIENTATION);
int size = cursor.getCount();
/******* If size is 0, there are no images on the SD Card. *****/
if (size == 0) {
imageDetails.setText("No Image");
}
else
{
int thumbID = 0;
if (cursor.moveToFirst()) {
/**************** Captured image details ************/
/***** Used to show image on view in LoadImagesFromSDCard class ******/
imageID = cursor.getInt(columnIndex);
thumbID = cursor.getInt(columnIndexThumb);
String Path = cursor.getString(file_ColumnIndex);
//String orientation = cursor.getString(orientation_ColumnIndex);
String CapturedImageDetails = " CapturedImageDetails : \n\n"
+" ImageID :"+imageID+"\n"
+" ThumbID :"+thumbID+"\n"
+" Path :"+Path+"\n";
// Show Captured Image detail on activity
imageDetails.setText( CapturedImageDetails );
}
}
} finally {
if (cursor != null) {
cursor.close();
}
}
// Return Captured Image ImageID ( By this ImageID Image will load from sdcard )
return ""+imageID;
}
/**
* Async task for loading the images from the SD card.
*
* @author Android Example
*
*/
// Class with extends AsyncTask class
public class LoadImagesFromSDCard extends AsyncTask<String, Void, Void> {
private ProgressDialog Dialog = new ProgressDialog(CameraPhotoCapture.this);
Bitmap mBitmap;
protected void onPreExecute() {
/****** NOTE: You can call UI Element here. *****/
// Progress Dialog
Dialog.setMessage(" Loading image from Sdcard..");
Dialog.show();
}
// Call after onPreExecute method
protected Void doInBackground(String... urls) {
Bitmap bitmap = null;
Bitmap newBitmap = null;
Uri uri = null;
try {
/** Uri.withAppendedPath Method Description
* Parameters
* baseUri Uri to append path segment to
* pathSegment encoded path segment to append
* Returns
* a new Uri based on baseUri with the given segment appended to the path
*/
uri = Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + urls[0]);
/************** Decode an input stream into a bitmap. *********/
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
if (bitmap != null) {
/********* Creates a new bitmap, scaled from an existing bitmap. ***********/
newBitmap = Bitmap.createScaledBitmap(bitmap, 170, 170, true);
bitmap.recycle();
if (newBitmap != null) {
mBitmap = newBitmap;
}
}
} catch (IOException e) {
// Error fetching image, try to recover
/********* Cancel execution of this task. **********/
cancel(true);
}
return null;
}
protected void onPostExecute(Void unused) {
// NOTE: You can call UI Element here.
// Close progress dialog
Dialog.dismiss();
if(mBitmap != null)
{
// Set Image to ImageView
showImg.setImageBitmap(mBitmap);
}
}
}
}