android程式設計實例入門 -Sample改寫分享 (2014/11/06)

android程式設計實例入門 -Sample改寫分享 (2014/11/06)

 

此範例為程式碼(10\Sample01)的改寫，建立兩個Button和一個EditText來實作GUI，利用FileInputStream+BufferedReader+InputStreamReader+FileOutputStream+BufferedWrite+OutputStreamWriter實作檔案讀寫功能，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.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.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;
/*
 * 建立兩個Button+EditText，利用FileInputStream+BufferedReader+InputStreamReader+FileOutputStream+BufferedWrite+OutputStreamWriter實作檔案讀寫功能。
 */
/*
 * <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 */
public class MainActivity extends Activity {
	Button[] bt = new Button[2] ;
	EditText et;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	      LinearLayout ll = new LinearLayout(this); 
	      ll.setOrientation(LinearLayout.VERTICAL);
	      setContentView(ll);
	            
	      
	      for(int i=0; i<bt.length; i++)
	      {
	         bt[i] = new Button(this);
	      }
	      
	      bt[0].setText("讀取");
	      bt[1].setText("儲��");
	      
	      et = new EditText(this);
	      et.setLines(3);

	      ll.addView(et);
	   
	      for(int i=0; i<bt.length; i++)
	      {
	    	  ll.addView(bt[i]);
	    	  bt[i].setOnClickListener(new SampleClickListener());//import android.view.View.OnClickListener;
	      }
	}
	class SampleClickListener implements OnClickListener
	{
		public void onClick(View v)
		{
			if(v == bt[0])
			{
				try
				{
					FileInputStream fis = openFileInput("Sample.txt");
					BufferedReader br = new  BufferedReader(new InputStreamReader(fis));
					StringBuffer sb = new StringBuffer();
					String str;
					while((str = br.readLine()) != null)
					{
						sb.append(str);
					}
					et.setText(sb);
				}
	            catch(Exception e){}
			}
			else if(v == bt[1])
			{
				try
				{
					FileOutputStream fos = openFileOutput("Sample.txt", Context.MODE_WORLD_READABLE);
					BufferedWriter bw = new  BufferedWriter(new OutputStreamWriter(fos));
					bw.write(et.getText().toString());
					bw.flush();
					fos.close();
				}
				catch(Exception e){}
			}    	 
		}
	}  
}