Android：从uri检索图像时出错

Question

In my Android application user can enter a profile picture. I have a predefined database in my assets folder. It has a table named Person. In the Person table there is a field Profile Picture which has BLOB type. I've saved the profile picture in the database using its' uri. I've used following code segment for retrieving uri of the image.

String path = null;
path = Images.Media.insertImage(getContentResolver(), bitmap,
                "title", null);

Uri imageUri = Uri.parse(path);

String uriString = imageUri.toString() ;            

person.setProfilePic(uriString);

ContentValues values = new ContentValues();
values.put(COLUMN_PROFILE_PICTURE, person.getProfilePic());

This is my entity class segment.

public class Person {
private int id;
private String profilePic;
private String name, date_of_birth, age, gender, bloodGrp;

......

public String getProfilePic() {
    return profilePic;
}

public void setProfilePic(String imageInByte) {
    this.profilePic = imageInByte;
}

I've retrieved person data from database by using this method.

public ArrayList<Person> getPersonList() {
    ArrayList<Person> personList = new ArrayList<Person>();

    String sql = "SELECT p.PersonName, p.ProfilePicture, p.DOB "
            + "FROM EMPerson p " + "ORDER BY p.PersonName ";
    System.out.println(sql);
    ArrayList<?> stringList = selectRecordsFromDB(sql, null);

    for (int i = 0; i < stringList.size(); i++) {
        ArrayList<?> arrayList = (ArrayList<?>) stringList.get(i);
        ArrayList<?> list = arrayList;
        Person person = new Person();
        person.setName((String) list.get(0));
        person.setProfilePic((String) list.get(1));
        person.setDate_of_birth((String) list.get(2));

        personList.add(person);

    }

    return personList;

}

I've used following method to get Bitmap from the url.

public Bitmap getBitmap(String url) {
    Log.d("getBitmap", "getBitmap");
    Bitmap bm = null;
    try {
        URL aURL = new URL(url);
        bm = BitmapFactory.decodeStream(aURL.openConnection().getInputStream());

    } catch (Exception e) {
        e.printStackTrace();
    } finally {

    }
    return bm;
}

I am calling this getBitmap method and set the bitmap in an image view as following.

Bitmap image;
image = getBitmap(i.getProfilePic());
proPic.setImageBitmap(image);

This is my CUstomAdapter class.

package my.easymedi.controller;

import java.util.ArrayList;
import my.easymedi.entity.Person;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class CustomAdapter extends ArrayAdapter<Person> {
private ArrayList<Person> lstPerson;
private Context my_context;

public CustomAdapter(Context context, int textViewResourceId,
        ArrayList<Person> objects) {
    super(context, textViewResourceId, objects);
    this.lstPerson = objects;
    my_context = context;
}

public View getView(int position, View convertView, ViewGroup parent) {

    // assign the view we are converting to a local variable
    View v = convertView;

    if (v == null) {
        LayoutInflater inflater = (LayoutInflater) getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.list_item, null);
    }

    Person i = lstPerson.get(position);

    if (i != null) {

        TextView personName = (TextView) v.findViewById(R.id.personName);
        ImageView proPic = (ImageView) v.findViewById(R.id.imgProPic);
        TextView dob = (TextView) v.findViewById(R.id.dateOfBirth);

        if (personName != null) {
            personName.setText(i.getName());
        }
        if (proPic != null) {
            Bitmap image;

            image = getBitmap(i.getProfilePic());

            proPic.setImageBitmap(image);

        }
        if (dob != null) {
            dob.setText(i.getDate_of_birth());
        }
    }

    return v;

}
public Bitmap getBitmap(String url) {
    Log.d("getBitmap", "getBitmap");
    Bitmap bm = null;
    try {
        Uri aURL = null;// new URL(url);
        Uri.parse(url);

        bm = BitmapFactory.decodeStream(my_context.getContentResolver().openInputStream(aURL));

    } catch (Exception e) {
        e.printStackTrace();
    } finally {

    }
    return bm;
}

}

But the problem is Image view is empty. Even though log cat doesn't show any error message. I am testing with an emulator. Can anyone plz be so kind enough to explain what's going on here ?

Thanks in advance

Answer 1

而不是aURL.openConnection().getInputStream() ，应使用getContentResolver().openInputStream(aURL)从内容URI检索数据。