Zi 字媒體

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。  */ /*  *  */ 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(); } } } }