從android數據庫的mysql數據庫檢索圖像

Question

我是新來的android工作室。在這裏，我試圖從存儲在在線服務器上的mysql數據庫中獲取圖像，並在listvew上顯示圖像。但是我在自定義文件中出現錯誤。請幫助我。 this is the error i'm getting in log when i try to run my application

這是我的customJava代碼： package com.example.manarpatel.book_app;

import android.app.Activity; 
import android.graphics.Bitmap; 
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 CustomList extends ArrayAdapter<String> { 
private String[] urls; 
private Bitmap[] bitmaps; 
private Activity context; 

public CustomList(Activity context, String[] urls, Bitmap[] bitmaps) { 
    super(context, R.layout.image_list_view, urls); 
    this.context = context; 
    this.urls= urls; 
    this.bitmaps= bitmaps; 
} 

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

     LayoutInflater inflater = context.getLayoutInflater(); 
     View listViewItem = inflater.inflate(R.layout.image_list_view,parent, true); 

     TextView textViewURL = (TextView) listViewItem.findViewById(R.id.textViewURL); 
     ImageView image = (ImageView) listViewItem.findViewById(R.id.imageDownloaded); 

     textViewURL.setText(urls[position]); 

    Bitmap smaller = Bitmap.createScaledBitmap(bitmaps[position], 100, 50, false); 
    image.setImageBitmap(smaller); 
     // image.setImageBitmap(Bitmap.createScaledBitmap(bitmaps[position], 100, 50, false)); 

    return listViewItem; 
    } 
} 

這裏，是我的圖像列表瀏覽器的Java代碼：

package com.example.manarpatel.book_app; 

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 

import org.json.JSONException; 

import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 


    public class ImageListView extends AppCompatActivity implements AdapterView.OnItemClickListener { 

    private ListView listView; 

    public static final String GET_IMAGE_URL="http://usedbookapp.esy.es/getAllImages.php"; 

    public GetAlImages getAlImages; 

    public static final String BITMAP_ID = "BITMAP_ID"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_image_list_view); 

     listView = (ListView) findViewById(R.id.listView); 
     listView.setOnItemClickListener(this); 
     getURLs(); 
    } 

    private void getImages(){ 
     class GetImages extends AsyncTask<Void,Void,Void>{ 
      ProgressDialog loading; 
      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 
       loading = ProgressDialog.show(ImageListView.this,"Downloading images...","Please wait...",false,false); 
      } 

      @Override 
      protected void onPostExecute(Void v) { 
       super.onPostExecute(v); 
       loading.dismiss(); 
       //Toast.makeText(ImageListView.this,"Success",Toast.LENGTH_LONG).show(); 
       CustomList customList = new CustomList(ImageListView.this,GetAlImages.imageURLs,GetAlImages.bitmaps); 
       listView.setAdapter(customList); 
      } 

      @Override 
      protected Void doInBackground(Void... voids) { 
       try { 
        getAlImages.getAllImages(); 

       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
       return null; 
      } 
     } 
     GetImages getImages = new GetImages(); 
     getImages.execute(); 
    } 

    private void getURLs() { 
     class GetURLs extends AsyncTask<String,Void,String>{ 
      ProgressDialog loading; 

      @Override 
      protected void onPreExecute() { 
       super.onPreExecute(); 
       loading = ProgressDialog.show(ImageListView.this,"Loading...","Please Wait...",true,true); 
      } 

      @Override 
      protected void onPostExecute(String s) { 
       super.onPostExecute(s); 
       loading.dismiss(); 
       getAlImages = new GetAlImages(s); 
       getImages(); 
      } 

      @Override 
      protected String doInBackground(String... strings) { 
       BufferedReader bufferedReader = null; 
       try { 
        URL url = new URL(strings[0]); 
        HttpURLConnection con = (HttpURLConnection) url.openConnection(); 
        StringBuilder sb = new StringBuilder(); 

        bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream())); 

        String json; 
        while((json = bufferedReader.readLine())!= null){ 
         sb.append(json+"\n"); 
        } 

        return sb.toString().trim(); 

       }catch(Exception e){ 
        return null; 
       } 
      } 
     } 
     GetURLs gu = new GetURLs(); 
     gu.execute(GET_IMAGE_URL); 
    } 

    @Override 
     public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 
     Intent intent = new Intent(this, ViewFullImage.class); 
     intent.putExtra(BITMAP_ID,i); 
     startActivity(intent); 
    } 
} 

Java代碼來獲取所有圖片：

package com.example.manarpatel.book_app; 


import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URL; 

public class GetAlImages { 

public static String[] imageURLs; 
public static Bitmap[] bitmaps; 

public static final String JSON_ARRAY="result"; 
public static final String IMAGE_URL = "url"; 
private String json; 
private JSONArray urls; 

public GetAlImages(String json){ 
    this.json = json; 
    try { 
     JSONObject jsonObject = new JSONObject(json); 
     urls = jsonObject.getJSONArray(JSON_ARRAY); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
} 

private Bitmap getImage(JSONObject jo){ 
    URL url = null; 
    Bitmap image = null; 
    try { 
     url = new URL(jo.getString(IMAGE_URL)); 
     image = BitmapFactory.decodeStream(url.openConnection().getInputStream()); 
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
    return image; 
} 

public void getAllImages() throws JSONException { 
    bitmaps = new Bitmap[urls.length()]; 

    imageURLs = new String[urls.length()]; 

    for(int i=0;i<urls.length();i++){ 
     imageURLs[i] = urls.getJSONObject(i).getString(IMAGE_URL); 
     JSONObject jsonObject = urls.getJSONObject(i); 
     bitmaps[i]=getImage(jsonObject); 
     } 
    } 
} 

這裏，圖像列表視圖的XML代碼

<LinearLayoutandroid:orientation="horizontal"android:layout_width="fill_parent" android:layout_height="wrap_content"> 
<ImageView android:id="@+id/imageDownloaded" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/abc_ic_menu_copy_mtrl_am_alpha"/> 
<TextView android:id="@+id/textViewURL" android:layout_width="wrap_content" android:layout_height="wrap_content"/> 

</LinearLayout> 

Answer 1

嘗試使用Glide檢索ima GE從數據庫

public class NetworkImageView extends ImageView { 

private String imageURL; 

/** 
* Resource ID of the image to be used as a placeholder until the network image is loaded. 
*/ 
private int mDefaultImageId; 

/** 
* Resource ID of the image to be used if the network response fails. 
*/ 
private int mErrorImageId; 

private Bitmap bitmap; 

public NetworkImageView(Context context) { 
    super(context); 
} 

public NetworkImageView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
} 

public NetworkImageView(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
} 

public String getImageURL() { 
    return imageURL; 
} 

public void setImageUrl(String imageURL) { 
    this.imageURL = imageURL; 
    Glide.with(getContext()) 
      .load(imageURL) 
      .override(200, 200) 
      .diskCacheStrategy(DiskCacheStrategy.ALL) 
      .into(this); 
} 

/** 
* Sets the default image resource ID to be used for this view until the attempt to load it 
* completes. 
*/ 
public void setDefaultImageResId(int defaultImage) { 
    mDefaultImageId = defaultImage; 
} 

/** 
* Sets the error image resource ID to be used for this view in the event that the image 
* requested fails to load. 
*/ 
public void setErrorImageResId(int errorImage) { 
    mErrorImageId = errorImage; 
} 

public void setLocalImageBitmap(Bitmap bitmap) { 
    this.bitmap = bitmap; 
} 

}

XML Lyaout：

<com.vynd.solution.utiles.NetworkImageView 
        android:id="@+id/backdrop" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" 
        android:background="@drawable/gradient" 
        android:scaleType="centerCrop" 
        android:src="@null" /> 

，並使用此

photo = (NetworkImageView) itemView.findViewById(R.id.photoItem); 

photo.setImageUrl(url); 

我希望本例是有用 更多信息Link

Answer 2

你可以試試這個太：

Picasso.with(this).load(imageURL).into(imageView); 

感謝