android程式設計實例入門 -Sample改寫分享 (2014/11/17)

android程式設計實例入門 -Sample改寫分享 (2014/11/17)

 

此範例為程式碼(11\Sample02)的改寫，建立Button[4]+WebView*1來實作GUI，利用WebView+WebViewClient實作簡易瀏覽器，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.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.Random;

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Button[4]+WebView*1，利用WebView+WebViewClient食作簡��瀏覽器。
 */
/*
 * <uses-permission android:name="android.permission.INTERNET" />
 */
public class MainActivity extends Activity {
	Button[] bt = new Button[4];
	WebView wv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	      TableLayout tl = new TableLayout(this); 
	      setContentView(tl);
	      wv = new WebView(this);
	      wv.setWebViewClient(new WebViewClient());
	      wv.loadUrl("http://www.google.com");
	      
	      TableRow tr = new TableRow(this);
	      
	      for(int i=0; i<bt.length; i++)
	      {
	         bt[i] = new Button(this);
	         tr.addView(bt[i]);
	      }
	      
	      bt[0].setText("←");
	      bt[1].setText("→");
	      bt[2].setText("+");
	      bt[3].setText("-");
	 
	      for(int i=0; i<bt.length; i++)
	      {
	         bt[i].setOnClickListener(new SampleClickListener());
	      }

	      tl.addView(tr);
	      tl.addView(wv);	      
	}
	class SampleClickListener implements OnClickListener
	{
		public void onClick(View v)
		{
			if(v == bt[0])
			{
				if(wv.canGoBack())  
	            {
					wv.goBack(); 
	            }
			}
			else if(v == bt[1])
			{
				if(wv.canGoForward())
				{
					wv. goForward();  
				}
			}    	 
			else if(v == bt[2])
			{
				wv.zoomIn(); 
			}
			else if(v == bt[3])
			{
				wv.zoomOut();
			}    	 
		}
	}
}