如何从 imageView 中的 imageUrl 获取图像

Question

如何在图像视图中从图像 url 获取图像。
我的 imageUrl 来自 databaseadapter。

在 Fields 类 LocationImage 中，数据类型是字符串，但在 setBackgroundResource 方法中，它要求输入 int 值作为参数。 LocationImage url 是从数据库中获取的，因此我将其作为字符串变量。

代码行在这里。

import java.util.ArrayList;

import android.app.ListActivity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
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.ListView;
import android.widget.TextView;

public class FindPlaces extends ListActivity{

    private SQLiteDatabase DbLoc;
    ListView lv;
    int val;
    private ArrayList<Fields> results = new ArrayList<Fields>();
    @Override
    public void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        setContentView(R.layout.places);
        getallLocs();
        setListAdapter(new StudentListAdapter(this,  val, results));
    }

    class StudentListAdapter extends ArrayAdapter<Fields>{
        private ArrayList<Fields> locationDetails;
        private Context mContext;

        public StudentListAdapter(Context context,int textViewResourceId, ArrayList<Fields> results) {
            super(context, textViewResourceId, results);
            // TODO Auto-generated constructor stub
            System.out.println("Constructor StudentList Adapter...");
            this.locationDetails = results;
            mContext = context;
        }
        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return results.size();
        }
        @Override
        public Fields getItem(int position) {
            // TODO Auto-generated method stub
            return locationDetails.get(position);
        }
        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return super.getItemId(position);
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            View v = convertView;
            if(v == null){
                LayoutInflater vl = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = vl.inflate(R.layout.placeslist, null);
            }
            Fields o = results.get(position);

            if (o != null) {
                TextView iv = (TextView)v.findViewById(R.id.toptext);
                TextView tv_sNo = (TextView)v.findViewById(R.id.toptext1);
                ImageView tv_Image = (ImageView)v.findViewById(R.id.Locimage);

                iv.setText(o.getLocationName());                            
                //tv_sNo.setText("Status: "+ o.getOrderStatus());
                tv_sNo.setText(o.getLocationImage());   
                tv_Image.setBackgroundResource(o.getLocationImage());
            }
            DbLoc.close();
                            return v;
        }       
    }
    static class ViewHolder
    {
        TextView Locationname;
        ImageView Locationimage;
    }
    private void getallLocs() {
        // TODO Auto-generated method stub
        try {
            DatabaseHelper dbHelper = new DatabaseHelper(
                    this.getApplicationContext());
            DbLoc = dbHelper.getWritableDatabase();
            Cursor c = DbLoc.rawQuery("SELECT " + DatabaseHelper.LocationName+ " , " + DatabaseHelper.LocationImage + " FROM "
                    + DatabaseHelper.LOCATIONTABLE , null);
            System.out.println("SELECT " + DatabaseHelper.LocationLang+" , "+DatabaseHelper.LocationLat+" , "+ DatabaseHelper.LocationName
                    + " ," + DatabaseHelper.LocationImage + " FROM "
                    + DatabaseHelper.LOCATIONTABLE );
            if (c != null) {
                if (c.moveToFirst()) {
                    do {
                        String LocationName= c.getString(c.getColumnIndex("LocationName"));
                        String Mobile = c.getString(c
                                .getColumnIndex("LocationImage"));
                        Fields p = new Fields(LocationName, Mobile);
                        results.add(p);

                    } while (c.moveToNext());
                }
            }
        } catch (SQLiteException se) {
            Log.e(getClass().getSimpleName(),
            "Could not create or Open the database");
        } 
                }
}

Answer 1

如果你有图片 url，请使用下面的代码将图片从 url 设置为 imageview

Bitmap mbmp = BitmapFactory.decodeStream(new java.net.URL("urlname").openStream());
Imageview_ref.setImageBitmap(mbmp);