我是Android编程新手。我在下面的代码中添加了一个图像到我的gallery SQLite数据库表。这适用于我使用相机添加图像时，但是，当我从图库中选择图像时，它似乎什么也没做，因为没有数据插入到表中。任何想法为什么会出现这种情况？
public class add_gallery extends AppCompatActivity {
Button addImage;
//change contact later
ArrayList<Gall> imageArry = new ArrayList<>();
//change to GalleryImageAdapter later
GalleryImageAdapter imageAdapter;
private static final int CAMERA_REQUEST = 1;
private static final int PICK_FROM_GALLERY = 2;
ListView dataList;
//maybe change to image title later
byte[] imageName;
int imageId;
Bitmap theImage;
DatabaseHelper myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_gallery);
dataList = (ListView) findViewById(R.id.list);
/**
* create DatabaseHelper object
*/
myDb = new DatabaseHelper(this);
/**
* Reading and getting all records from database
*/
List<Gall> images = myDb.getAllGallery();
for (Gall cn : images) {
String log = "ID:" + cn.getID() + " Image: " + Arrays.toString(cn.getImage())
+ " ,Title: " + cn.getTitle()
+ " ,Caption: " + cn.getCaption();
// Writing Galls to log
Log.d("Result: ", log);
// add images data in arrayList
imageArry.add(cn);
}
/**
* Set Data base Item into listview
*/
imageAdapter = new GalleryImageAdapter(this, R.layout.gallery_list,
imageArry);
dataList.setAdapter(imageAdapter);
/**
* go to next activity for detail image
*/
dataList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
final int position, long id) {
imageName = imageArry.get(position).getImage();
imageId = imageArry.get(position).getID();
Log.d("Before Send:****", Arrays.toString(imageName) + "-" + imageId);
// convert byte to bitmap
ByteArrayInputStream imageStream = new ByteArrayInputStream(
imageName);
theImage = BitmapFactory.decodeStream(imageStream);
Intent intent = new Intent(add_gallery.this,
DisplayImageActivity.class);
intent.putExtra("imageid", imageId);
intent.putExtra("imagename", theImage);
startActivity(intent);
}
});
/**
* open dialog for choose camera/gallery
*/
final String[] option = new String[] { "Take from Camera",
"Select from Gallery" };
ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
android.R.layout.select_dialog_item, option);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select Option");
builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Log.e("Selected Item", String.valueOf(which));
if (which == 0) {
callCamera();
}
if (which == 1) {
callGallery();
}
}
});
final AlertDialog dialog = builder.create();
addImage = (Button) findViewById(R.id.btnAdd);
addImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dialog.show();
}
});
}
/**
* On activity result
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK)
return;
switch (requestCode) {
case CAMERA_REQUEST:
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap yourImage = extras.getParcelable("data");
// convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
assert yourImage != null;
yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte imageInByte[] = stream.toByteArray();
Log.e("output before conversion", Arrays.toString(imageInByte));
// Inserting Image to gallery
Log.d("Insert: ", "Inserting ..");
myDb.addGallery(new Gall(imageInByte,"The Title","The Description"));
Intent i = new Intent(add_gallery.this,
add_gallery.class);
startActivity(i);
finish();
}
break;
case PICK_FROM_GALLERY:
Bundle extras2 = data.getExtras();
if (extras2 != null) {
Bitmap yourImage = extras2.getParcelable("data");
// convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
assert yourImage != null;
yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte imageInByte[] = stream.toByteArray();
Log.e("output before conversion", Arrays.toString(imageInByte));
// Inserting Galls
Log.d("Insert: ", "Inserting ..");
myDb.addGallery(new Gall(imageInByte, "The Title", "The Description"));
Intent i = new Intent(add_gallery.this,
add_gallery.class);
startActivity(i);
finish();
}
break;
}
}
/**
* open camera method
*/
public void callCamera() {
Intent cameraIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
/**
* open gallery method
*/
public void callGallery() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
startActivityForResult(
Intent.createChooser(intent, "Complete action using"),
PICK_FROM_GALLERY);
}
}