我是安卓新手。我要创建一个 android 应用程序。我想在我的应用程序中创建一个相册文件夹并将相机照片保存到相册文件夹中。请建议我如何。
我的代码是：
公共类 CameraPhotoCapture 扩展 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) {
/***** 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);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
String imageId = convertImageUriToFile(imageUri,CameraActivity);
new LoadImagesFromSDCard().execute(""+imageId);
} 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();
}
}
}
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)
);
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 view
imageDetails.setText(CapturedImageDetails);
}
}
} finally {
if (cursor != null) {
cursor.close();
}
}
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. *****/
//UI Element
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)
showImg.setImageBitmap(mBitmap);
}
}
}