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Clound SSD Virtual Server

Android Loading JSON and ProgressBar/ProgressDialog

Android Loading JSON and ProgressBar/ProgressDialog บทความนี้ค่อนข้างจะ Advanced จะเป็นการเขียน Android เพื่อดึงข้อมูลจาก Server ในรูปแบบของ JSON และการแสดงข้อมูลอื่น ๆ จาก Server เช่นรูปภาพ แสดงผลใน ImageView ของ Column โดยในขณะที่กำลังโหลดข้อมูลจาก Server จะใช้ ProgressBar และ ProgressDialog ควบคุมการแสดงสถานะการทำงานในแต่ล่ะขั้นตอน

ในตัวอย่างนี้จะแบ่งการทำงานเป็น 2 ขั้นตอนคือ
- โหลดข้อมูลแต่ล่ะรายการมาแสดงใน ListView (ในขณะที่โหลดข้อมูลจะแสดง ProgressBar)
- เมื่อคลิกแต่ล่ะ Item ของ ListView แสดง Full Image (ในขณะที่โหลดข้อมูลจะแสดง ProgressBar)

โดยใน Column ของ ListView ที่เป็น ImageView จะแสดงภาพที่เป็น Thumbnail และเมื่อคลิกแต่ล่ะ Items จะแสดงภาพจาก Full Photo

Android Loading JSON and ProgressBar/ProgressDialog


รูปภาพประกอบแสดงตัวอย่างการทำงาน และการแสดง ProgressBar ในขณะที่กำลังโหลดข้อมูลจาก Server


AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />

ในการเขียน Android เพื่อติดต่อกับ Internet จะต้องกำหนด Permission ในส่วนนี้ด้วยทุกครั้ง

Web Server

ชื่อตางราง MySQL ว่า images โดยจัดเก็บชื่อรุปภาพ และ Path ของ Thumbnail , FullPhoto

images
CREATE TABLE IF NOT EXISTS `images` (
  `ImageID` int(11) NOT NULL auto_increment,
  `ImageName` varchar(50) NOT NULL,
  `ImagePath_Thumbnail` varchar(150) NOT NULL,
  `ImagePath_FullPhoto` varchar(150) NOT NULL,
  PRIMARY KEY  (`ImageID`)
) ENGINE=MyISAM  AUTO_INCREMENT=7 ;

--
-- Dumping data for table `images`
--

INSERT INTO `images` (`ImageID`, `ImageName`, `ImagePath_Thumbnail`, `ImagePath_FullPhoto`) VALUES
(1, 'Image 1', 'https://www.thaicreate.com/android/img1_thum.jpg', 'https://www.thaicreate.com/android/img1_full.jpg'),
(2, 'Image 2', 'https://www.thaicreate.com/android/img2_thum.jpg', 'https://www.thaicreate.com/android/img2_full.jpg'),
(3, 'Image 3', 'https://www.thaicreate.com/android/img3_thum.jpg', 'https://www.thaicreate.com/android/img3_full.jpg'),
(4, 'Image 4', 'https://www.thaicreate.com/android/img4_thum.jpg', 'https://www.thaicreate.com/android/img4_full.jpg'),
(5, 'Image 5', 'https://www.thaicreate.com/android/img5_thum.jpg', 'https://www.thaicreate.com/android/img5_full.jpg'),
(6, 'Image 6', 'https://www.thaicreate.com/android/img6_thum.jpg', 'https://www.thaicreate.com/android/img6_full.jpg');


โครงสร้างของ MySQL Database

Android Loading JSON and ProgressBar/ProgressDialog

ไฟล์รุปภาพที่ถูกจัดเก็บไว้ใน Web Server

Android Loading JSON and ProgressBar/ProgressDialog

จะเห็นว่าไฟล์ Thumbnail และ Full จะมีขนาดและ Size ที่ต่างกัน

Android Loading JSON and ProgressBar/ProgressDialog

getJSON.php
<?php
	$objConnect = mysql_connect("localhost","root","root");
	$objDB = mysql_select_db("mydatabase");

	$strSQL = "SELECT * FROM images WHERE 1  ";
	$objQuery = mysql_query($strSQL);
	$intNumField = mysql_num_fields($objQuery);
	$resultArray = array();
	while($obResult = mysql_fetch_array($objQuery))
	{
		$arrCol = array();
		for($i=0;$i<$intNumField;$i++)
		{
			$arrCol[mysql_field_name($objQuery,$i)] = $obResult[$i];
		}
		array_push($resultArray,$arrCol);
	}
	
	mysql_close($objConnect);
	
	echo json_encode($resultArray);
?>

ไฟล์ php ในฝั่ง Server ที่จะส่งข้อมูลให้กับ Android

Android HttpGet and HttpPost

พื้นฐานให้อ่านบทความ HttpGet กับ HttpPost จะได้เข้าใจง่ายขึ้








Android Project

Example 1 แสดงข้อมูลจาก Web Server ทั้งข้อความและรูปภาพลงในรายการของ ListView

โครงสร้างของไฟล์ประกอบด้วย 3 ไฟล์คือ MainActivity.java, activity_main.xml และ activity_column.xml

Android Loading JSON and ProgressBar/ProgressDialog

activity_main.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
 
   	<TableRow
      android:id="@+id/tableRow1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" >
     
     <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Download and ProgressBar : "
        android:layout_span="1"
        android:textAppearance="?android:attr/textAppearanceMedium" />
  	        
 	</TableRow>

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
 
  <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.1">   
     
     <ListView
         android:id="@+id/listView1"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
     </ListView>
  	        
 	</LinearLayout>

	<View
		android:layout_height="1dip"
		android:background="#CCCCCC" />
   		  
   	<LinearLayout
      android:id="@+id/LinearLayout1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:padding="5dip" >

   		<TextView
   		    android:id="@+id/textView2"
   		    android:layout_width="wrap_content"
   		    android:layout_height="wrap_content"
   		    android:text="By.. ThaiCreate.Com" />

	</LinearLayout>
	
</TableLayout>


activity_column.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <TableRow
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <ImageView
            android:id="@+id/ColImgPath"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
            />
        
        <TextView
            android:id="@+id/ColImgID"
            android:text="Column 1" />

        <TextView
            android:id="@+id/ColImgName"
            android:text="Column 2" />
        
    </TableRow>

 
</TableLayout>


MainActivity.java
package com.myapp;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

	public static final int DIALOG_DOWNLOAD_JSON_PROGRESS = 0;
    private ProgressDialog mProgressDialog;
    
    ArrayList<HashMap<String, Object>> MyArrList;

	
    @SuppressLint("NewApi")
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        
	    // Download JSON File	
		new DownloadJSONFileAsync().execute();
        
    }
       
    
    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DIALOG_DOWNLOAD_JSON_PROGRESS:
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage("Downloading.....");
            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            mProgressDialog.setCancelable(true);
            mProgressDialog.show();
            return mProgressDialog;
        default:
            return null;
        }
    }
    
    // Show All Content
    public void ShowAllContent()
    {
        // listView1
        final ListView lstView1 = (ListView)findViewById(R.id.listView1); 
        lstView1.setAdapter(new ImageAdapter(MainActivity.this,MyArrList));
        
    }
    
    

    public class ImageAdapter extends BaseAdapter 
    {
        private Context context;
        private ArrayList<HashMap<String, Object>> MyArr = new ArrayList<HashMap<String, Object>>();

        public ImageAdapter(Context c, ArrayList<HashMap<String, Object>> myArrList) 
        {
        	// TODO Auto-generated method stub
            context = c;
            MyArr = myArrList;
        }
 
        public int getCount() {
        	// TODO Auto-generated method stub
            return MyArr.size();
        }
 
        public Object getItem(int position) {
        	// TODO Auto-generated method stub
            return position;
        }
 
        public long getItemId(int position) {
        	// TODO Auto-generated method stub
            return position;
        }
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			
			LayoutInflater inflater = (LayoutInflater) context
					.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		 
		 
			if (convertView == null) {
				convertView = inflater.inflate(R.layout.activity_column, null); 
			}

			// ColImage
			ImageView imageView = (ImageView) convertView.findViewById(R.id.ColImgPath);
			imageView.getLayoutParams().height = 80;
			imageView.getLayoutParams().width = 80;
			imageView.setPadding(5, 5, 5, 5);
			imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        	 try
        	 {
        		 imageView.setImageBitmap((Bitmap)MyArr.get(position).get("ImageThumBitmap"));
        	 } catch (Exception e) {
        		 // When Error
        		 imageView.setImageResource(android.R.drawable.ic_menu_report_image);
        	 }
				
			// ColImgID
			TextView txtImgID = (TextView) convertView.findViewById(R.id.ColImgID);
			txtImgID.setPadding(10, 0, 0, 0);
			txtImgID.setText("ID : " + MyArr.get(position).get("ImageID").toString());
			
			// ColImgName
			TextView txtPicName = (TextView) convertView.findViewById(R.id.ColImgName);
			txtPicName.setPadding(50, 0, 0, 0);
			txtPicName.setText("Name : " + MyArr.get(position).get("ImageName").toString());	
		 
			return convertView;
				
		}

    } 
    
    
    
    // Download JSON in Background
    public class DownloadJSONFileAsync extends AsyncTask<String, Void, Void> {
    	
        protected void onPreExecute() {
        	super.onPreExecute();
        	showDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
        }

        @Override
        protected Void doInBackground(String... params) {
            // TODO Auto-generated method stub

            /** JSON from URL
             * [
             * {"ImageID":"1","ImageName":"Image 1","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img1_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img1_full.jpg"},
             * {"ImageID":"2","ImageName":"Image 2","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img2_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img2_full.jpg"},
             * {"ImageID":"3","ImageName":"Image 3","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img3_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img3_full.jpg"},
             * {"ImageID":"4","ImageName":"Image 4","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img4_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img4_full.jpg"},
             * {"ImageID":"5","ImageName":"Image 5","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img5_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img5_full.jpg"},
             * {"ImageID":"6","ImageName":"Image 6","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img6_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img6_full.jpg"}
             * ]
             */
        	
        	String url = "https://www.thaicreate.com/android/getJSON.php";
        	
        	JSONArray data;
			try {
				data = new JSONArray(getJSONUrl(url));
				
		    	MyArrList = new ArrayList<HashMap<String, Object>>();
				HashMap<String, Object> map;
				
				for(int i = 0; i < data.length(); i++){
	                JSONObject c = data.getJSONObject(i);
	    			map = new HashMap<String, Object>();
	    			map.put("ImageID", (String)c.getString("ImageID"));
	    			map.put("ImageName", (String)c.getString("ImageName"));
	    			
	    			// Thumbnail Get ImageBitmap To Object
	    			map.put("ImagePathThum", (String)c.getString("ImagePath_Thumbnail"));
	    			map.put("ImageThumBitmap", (Bitmap)loadBitmap(c.getString("ImagePath_Thumbnail")));
	    			
	    			// Full (for View Popup)
	    			map.put("ImagePathFull", (String)c.getString("ImagePath_FullPhoto"));
	    			
	    			MyArrList.add(map);
				}
	    		
				
			} catch (JSONException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

    		return null;
        }

        protected void onPostExecute(Void unused) {
        	ShowAllContent(); // When Finish Show Content
            dismissDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
            removeDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
        }
        

    }

    
    /*** Get JSON Code from URL ***/
  	public String getJSONUrl(String url) {
  		StringBuilder str = new StringBuilder();
  		HttpClient client = new DefaultHttpClient();
  		HttpGet httpGet = new HttpGet(url);
  		try {
  			HttpResponse response = client.execute(httpGet);
  			StatusLine statusLine = response.getStatusLine();
  			int statusCode = statusLine.getStatusCode();
  			if (statusCode == 200) { // Download OK
  				HttpEntity entity = response.getEntity();
  				InputStream content = entity.getContent();
  				BufferedReader reader = new BufferedReader(new InputStreamReader(content));
  				String line;
  				while ((line = reader.readLine()) != null) {
  					str.append(line);
  				}
  			} else {
  				Log.e("Log", "Failed to download file..");
  			}
  		} catch (ClientProtocolException e) {
  			e.printStackTrace();
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  		return str.toString();
  	}
   
  	
  	/***** Get Image Resource from URL (Start) *****/
	private static final String TAG = "Image";
	private static final int IO_BUFFER_SIZE = 4 * 1024;
	public static Bitmap loadBitmap(String url) {
	    Bitmap bitmap = null;
	    InputStream in = null;
	    BufferedOutputStream out = null;

	    try {
	        in = new BufferedInputStream(new URL(url).openStream(), IO_BUFFER_SIZE);

	        final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
	        out = new BufferedOutputStream(dataStream, IO_BUFFER_SIZE);
	        copy(in, out);
	        out.flush();

	        final byte[] data = dataStream.toByteArray();
	        BitmapFactory.Options options = new BitmapFactory.Options();
	        //options.inSampleSize = 1;

	        bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
	    } catch (IOException e) {
	        Log.e(TAG, "Could not load Bitmap from: " + url);
	    } finally {
	        closeStream(in);
	        closeStream(out);
	    }

	    return bitmap;
	}

	 private static void closeStream(Closeable stream) {
	        if (stream != null) {
	            try {
	                stream.close();
	            } catch (IOException e) {
	                android.util.Log.e(TAG, "Could not close stream", e);
	            }
	        }
	    }
	 
	 private static void copy(InputStream in, OutputStream out) throws IOException {
        byte[] b = new byte[IO_BUFFER_SIZE];
        int read;
        while ((read = in.read(b)) != -1) {
            out.write(b, 0, read);
        }
    }
	 /***** Get Image Resource from URL (End) *****/
	
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    
}


Screenshot

Android Loading JSON and ProgressBar/ProgressDialog

กำลังโหลดข้อมูล และแสดงผล Progress Dialog

Android Loading JSON and ProgressBar/ProgressDialog

หลังจากโหลดเรียบร้อยแล้วจะแสดงข้อมูลทาง ListView และ Progress Dialog ก็จะหายไป








Example 1.1 เมื่อคลิกที่รูปภาพจะแสดง ProgressBar เพื่อโหลดข้อมูลและแสดงรูปภาพหลังจากที่โหลดเรียบร้อยแล้ว

เพ่มไฟล์ custom_fullimage_dialog.xml และแก้ไข MainActivity.java

custom_fullimage_dialog.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:padding="10dp" >


    <ImageView
        android:id="@+id/fullimage"
        android:layout_width="match_parent"
        android:layout_height="320dp" />

    <TextView android:id="@+id/custom_fullimage_placename"
        android:layout_width="wrap_content" android:layout_height="fill_parent"
        android:textColor="#FFF">
    </TextView>
</LinearLayout>


MainActivity.java
package com.myapp;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

	public static final int DIALOG_DOWNLOAD_JSON_PROGRESS = 0;
	public static final int DIALOG_DOWNLOAD_FULL_PHOTO_PROGRESS = 1;
    private ProgressDialog mProgressDialog;
    
    ArrayList<HashMap<String, Object>> MyArrList;

	
    @SuppressLint("NewApi")
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        
	    // Download JSON File	
		new DownloadJSONFileAsync().execute();
        
    }
       
    
    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DIALOG_DOWNLOAD_JSON_PROGRESS:
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage("Downloading.....");
            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            mProgressDialog.setCancelable(true);
            mProgressDialog.show();
            return mProgressDialog;
        case DIALOG_DOWNLOAD_FULL_PHOTO_PROGRESS:
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage("Downloading.....");
            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            mProgressDialog.setCancelable(true);
            mProgressDialog.show();
            return mProgressDialog; 
        default:
            return null;
        }
    }
    
    // Show All Content
    public void ShowAllContent()
    {
        // listView1
        final ListView lstView1 = (ListView)findViewById(R.id.listView1); 
        lstView1.setAdapter(new ImageAdapter(MainActivity.this,MyArrList));
        
        // OnClick
        lstView1.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> parent, View v,
				int position, long id) {
				String strImageName = MyArrList.get(position).get("ImageName").toString();
				String strImagePathFull = MyArrList.get(position).get("ImagePathFull").toString();
				
				new DownloadFullPhotoFileAsync().execute(strImageName,strImagePathFull); // Download file Full Photo
			}
		});
    }
    
    // Show Dialog Popup 
    public void showDialogPopup(String strImageName,Bitmap ImageFullPhoto)
    {
    
        final AlertDialog.Builder imageDialog = new AlertDialog.Builder(this);
        final LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
        
        
    	  View layout = inflater.inflate(R.layout.custom_fullimage_dialog,
                  (ViewGroup) findViewById(R.id.layout_root));
          ImageView image = (ImageView) layout.findViewById(R.id.fullimage);
          
         	 try
         	 {
         		image.setImageBitmap(ImageFullPhoto);
         	 } catch (Exception e) {
         		 // When Error
         		image.setImageResource(android.R.drawable.ic_menu_report_image);
         	 }
			
          imageDialog.setIcon(android.R.drawable.btn_star_big_on);	
  		  imageDialog.setTitle("View : " + strImageName);
          imageDialog.setView(layout);
          imageDialog.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){

              public void onClick(DialogInterface dialog, int which) {
                  dialog.dismiss();
              }

          });

          imageDialog.create();
          imageDialog.show(); 
          
    }
    

    public class ImageAdapter extends BaseAdapter 
    {
        private Context context;
        private ArrayList<HashMap<String, Object>> MyArr = new ArrayList<HashMap<String, Object>>();

        public ImageAdapter(Context c, ArrayList<HashMap<String, Object>> myArrList) 
        {
        	// TODO Auto-generated method stub
            context = c;
            MyArr = myArrList;
        }
 
        public int getCount() {
        	// TODO Auto-generated method stub
            return MyArr.size();
        }
 
        public Object getItem(int position) {
        	// TODO Auto-generated method stub
            return position;
        }
 
        public long getItemId(int position) {
        	// TODO Auto-generated method stub
            return position;
        }
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			
			LayoutInflater inflater = (LayoutInflater) context
					.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		 
		 
			if (convertView == null) {
				convertView = inflater.inflate(R.layout.activity_column, null); 
			}

			// ColImage
			ImageView imageView = (ImageView) convertView.findViewById(R.id.ColImgPath);
			imageView.getLayoutParams().height = 80;
			imageView.getLayoutParams().width = 80;
			imageView.setPadding(5, 5, 5, 5);
			imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        	 try
        	 {
        		 imageView.setImageBitmap((Bitmap)MyArr.get(position).get("ImageThumBitmap"));
        	 } catch (Exception e) {
        		 // When Error
        		 imageView.setImageResource(android.R.drawable.ic_menu_report_image);
        	 }
				
			// ColImgID
			TextView txtImgID = (TextView) convertView.findViewById(R.id.ColImgID);
			txtImgID.setPadding(10, 0, 0, 0);
			txtImgID.setText("ID : " + MyArr.get(position).get("ImageID").toString());
			
			// ColImgName
			TextView txtPicName = (TextView) convertView.findViewById(R.id.ColImgName);
			txtPicName.setPadding(50, 0, 0, 0);
			txtPicName.setText("Name : " + MyArr.get(position).get("ImageName").toString());	
		 
			return convertView;
				
		}

    } 
    
    
    
    // Download JSON in Background
    public class DownloadJSONFileAsync extends AsyncTask<String, Void, Void> {
    	
        protected void onPreExecute() {
        	super.onPreExecute();
        	showDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
        }

        @Override
        protected Void doInBackground(String... params) {
            // TODO Auto-generated method stub

            /** JSON from URL
             * [
             * {"ImageID":"1","ImageName":"Image 1","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img1_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img1_full.jpg"},
             * {"ImageID":"2","ImageName":"Image 2","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img2_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img2_full.jpg"},
             * {"ImageID":"3","ImageName":"Image 3","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img3_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img3_full.jpg"},
             * {"ImageID":"4","ImageName":"Image 4","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img4_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img4_full.jpg"},
             * {"ImageID":"5","ImageName":"Image 5","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img5_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img5_full.jpg"},
             * {"ImageID":"6","ImageName":"Image 6","ImagePath_Thumbnail":"https://www.thaicreate.com/android/img6_thum.jpg" ,"ImagePath_FullPhoto":"https://www.thaicreate.com/android/img6_full.jpg"}
             * ]
             */
        	
        	String url = "https://www.thaicreate.com/android/getJSON.php";
        	
        	JSONArray data;
			try {
				data = new JSONArray(getJSONUrl(url));
				
		    	MyArrList = new ArrayList<HashMap<String, Object>>();
				HashMap<String, Object> map;
				
				for(int i = 0; i < data.length(); i++){
	                JSONObject c = data.getJSONObject(i);
	    			map = new HashMap<String, Object>();
	    			map.put("ImageID", (String)c.getString("ImageID"));
	    			map.put("ImageName", (String)c.getString("ImageName"));
	    			
	    			// Thumbnail Get ImageBitmap To Object
	    			map.put("ImagePathThum", (String)c.getString("ImagePath_Thumbnail"));
	    			map.put("ImageThumBitmap", (Bitmap)loadBitmap(c.getString("ImagePath_Thumbnail")));
	    			
	    			// Full (for View Popup)
	    			map.put("ImagePathFull", (String)c.getString("ImagePath_FullPhoto"));
	    			
	    			MyArrList.add(map);
				}
	    		
				
			} catch (JSONException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

    		return null;
        }

        protected void onPostExecute(Void unused) {
        	ShowAllContent(); // When Finish Show Content
            dismissDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
            removeDialog(DIALOG_DOWNLOAD_JSON_PROGRESS);
        }
        

    }
    
    // Download Full Photo in Background
    public class DownloadFullPhotoFileAsync extends AsyncTask<String, Void, Void> {
    	
    	String strImageName = "";
    	String ImageFullPhoto = "";
    	
    	Bitmap ImageFullBitmap = null;

        protected void onPreExecute() {
        	super.onPreExecute();
        	showDialog(DIALOG_DOWNLOAD_FULL_PHOTO_PROGRESS);
        }

        @Override
        protected Void doInBackground(String... params) {
        	strImageName = params[0];
            ImageFullPhoto = params[1];

            ImageFullBitmap = (Bitmap)loadBitmap(ImageFullPhoto);
    		return null;
        }

        protected void onPostExecute(Void unused) {
        	showDialogPopup(strImageName,ImageFullBitmap); // When Finish Show Popup
            dismissDialog(DIALOG_DOWNLOAD_FULL_PHOTO_PROGRESS);
            removeDialog(DIALOG_DOWNLOAD_FULL_PHOTO_PROGRESS);
        }
        

    }
    
    
    /*** Get JSON Code from URL ***/
  	public String getJSONUrl(String url) {
  		StringBuilder str = new StringBuilder();
  		HttpClient client = new DefaultHttpClient();
  		HttpGet httpGet = new HttpGet(url);
  		try {
  			HttpResponse response = client.execute(httpGet);
  			StatusLine statusLine = response.getStatusLine();
  			int statusCode = statusLine.getStatusCode();
  			if (statusCode == 200) { // Download OK
  				HttpEntity entity = response.getEntity();
  				InputStream content = entity.getContent();
  				BufferedReader reader = new BufferedReader(new InputStreamReader(content));
  				String line;
  				while ((line = reader.readLine()) != null) {
  					str.append(line);
  				}
  			} else {
  				Log.e("Log", "Failed to download file..");
  			}
  		} catch (ClientProtocolException e) {
  			e.printStackTrace();
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  		return str.toString();
  	}
   
  	
  	/***** Get Image Resource from URL (Start) *****/
	private static final String TAG = "Image";
	private static final int IO_BUFFER_SIZE = 4 * 1024;
	public static Bitmap loadBitmap(String url) {
	    Bitmap bitmap = null;
	    InputStream in = null;
	    BufferedOutputStream out = null;

	    try {
	        in = new BufferedInputStream(new URL(url).openStream(), IO_BUFFER_SIZE);

	        final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
	        out = new BufferedOutputStream(dataStream, IO_BUFFER_SIZE);
	        copy(in, out);
	        out.flush();

	        final byte[] data = dataStream.toByteArray();
	        BitmapFactory.Options options = new BitmapFactory.Options();
	        //options.inSampleSize = 1;

	        bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
	    } catch (IOException e) {
	        Log.e(TAG, "Could not load Bitmap from: " + url);
	    } finally {
	        closeStream(in);
	        closeStream(out);
	    }

	    return bitmap;
	}

	 private static void closeStream(Closeable stream) {
	        if (stream != null) {
	            try {
	                stream.close();
	            } catch (IOException e) {
	                android.util.Log.e(TAG, "Could not close stream", e);
	            }
	        }
	    }
	 
	 private static void copy(InputStream in, OutputStream out) throws IOException {
        byte[] b = new byte[IO_BUFFER_SIZE];
        int read;
        while ((read = in.read(b)) != -1) {
            out.write(b, 0, read);
        }
    }
	 /***** Get Image Resource from URL (End) *****/
	
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    
}




Screenshot

Android Loading JSON and ProgressBar/ProgressDialog

คลิกแต่ล่ะรายการ

Android Loading JSON and ProgressBar/ProgressDialog

กำลังโหลดภาที่เป็น Full Images

Android Loading JSON and ProgressBar/ProgressDialog

แสดงภาพ Full Image จากเว็บไซต์



AsyncTask and ProgressDialog (showDialog, dismissDialog, removeDialog : Deprecated)


   
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ช่วยกันสนับสนุนรักษาเว็บไซต์ความรู้แห่งนี้ไว้ด้วยการสนับสนุน Source Code 2.0 ของทีมงานไทยครีเอท


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  By : ThaiCreate.Com Team (บทความเป็นลิขสิทธิ์ของเว็บไทยครีเอทห้ามนำเผยแพร่ ณ เว็บไซต์อื่น ๆ)
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  Create/Update Date : 2012-08-11 13:08:18 / 2017-03-26 22:56:27
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