android程式設計實例入門 -Sample改寫分享 (2014/11/19)

android程式設計實例入門 -Sample改寫分享 (2014/11/19)

 

此範例為程式碼(11\Sample04)的改寫，建立建立EditText*1+Button*1+ListView*1來實作GUI，利用HttpClient抓取網路上XML+ XmlPullParserFactory和XmlPullParser來分析XML，程式碼如下所示：

 

package com.jashsample;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.ContactsContract;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.app.SearchManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnKeyListener;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Camera;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.hardware.Camera.Size;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.speech.RecognizerIntent;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.text.format.DateFormat;
import android.text.method.KeyListener;
import android.view.Display;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewFlipper;
/*
 * 建立EditText*1+Button*1+ListView*1，利用HttpClient抓取網路上XML+ XmlPullParserFactory和XmlPullParser來分析XML。
 */
/*
 * <uses-permission android:name="android.permission.INTERNET" />
 */
public class MainActivity extends Activity {
	EditText et;
	Button bt;
	ListView lv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		LinearLayout ll = new LinearLayout(this); 
		ll.setOrientation(LinearLayout.VERTICAL);
		setContentView(ll);
	      
		et = new EditText(this);
		bt = new Button(this);
		lv = new ListView(this);

		bt.setText("讀取");
	      
		ll.addView(et);
		ll.addView(bt);
		ll.addView(lv);
	      
		bt.setOnClickListener(new SampleClickListener());
	}
	class SampleClickListener implements OnClickListener
	{
		public void onClick(View v)
		{
			try
			{
				ArrayList<Map<String, String>> list = new ArrayList<Map<String, String>>();

				String uri = et.getText().toString();
	            HttpClient hc = new DefaultHttpClient();
	            HttpGet hg = new HttpGet();
	            hg.setURI(new URI(uri));
	            HttpResponse hr = hc.execute(hg);
	            
	            InputStream is = hr.getEntity().getContent();
	    	    BufferedReader br = new  BufferedReader(new InputStreamReader(is));

	    	    XmlPullParserFactory xpf = XmlPullParserFactory.newInstance();
	    	    XmlPullParser xpp = xpf.newPullParser();
	            xpp.setInput(br);
	    	 
	            int type = 0;
	            type = xpp.getEventType();
	            HashMap<String,String> mp = null;
	            String title = "";
	            String description = "";
	            boolean isItem = false;
	            
	            while (type != XmlPullParser.END_DOCUMENT)
	            {
	               if(type == XmlPullParser.START_TAG)
	               {
	            	  if(xpp.getName().equals("item")) 
	                  {
	                     mp = new HashMap<String, String>();           		  
	                     isItem = true;
	                  }
	                  else if(xpp.getName().equals("title") )
	        	      {
	                	 if(isItem == true) 
	                	 {
	                         title = xpp.nextText();
	            	         mp.put("title", title);
	            	      }
	                  }
	                  else if(xpp.getName().equals("description"))
	        	      {
	                     if(isItem == true) 
	                     {
	            	         description = xpp.nextText();
	                         mp.put("description", description);
	                     }
	                  }
	               }  
	               else if(type == XmlPullParser.END_TAG)
	               {
	            	  if(xpp.getName().equals("item")) 
	             	  {
	             		  list.add(mp);        		  
	                      isItem = false;
	             	  }
	                }
	                type = xpp.next();
	            }
	            String[] keys = {"title", "description"};
	            int[] ids = {android.R.id.text1, android.R.id.text2};
	            SimpleAdapter sa = new SimpleAdapter
	               (getApplicationContext(), list, android.R.layout.simple_list_item_2, keys, ids);
	            
	            lv.setAdapter(sa);
	         }
	         catch(Exception e)
	         {
	        	 Toast.makeText(getBaseContext(), "請確認URL。", Toast.LENGTH_LONG).show();
	         }
		}
	}
}