SQLite Android

package com.cor;

import android.R.anim;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
import android.widget.SimpleAdapter.ViewBinder;
import android.widget.Toast;

public class TestAndroidActivity extends Activity implements View.OnClickListener{
	
	  private static final String TAG = "AcMain";
    
      
      private Button add;
      private Button delete;
      private Button update;
      private Button select;
      
      
      private SQLiteDatabase sd;
      public String db_name = "gallery.sqlite";
      public String table_name = "pic";
      
      final DbHelper helper = new DbHelper(this, db_name, null, 1);
      
      
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        findView();
        
        sd = helper.getWritableDatabase();
        
        initDataBase(sd);
        updateSpinner();
        
     
    }
    
    
    
    private void updateSpinner() {
		// TODO Auto-generated method stub
		Spinner spinner = (Spinner)findViewById(R.id.spinner1);
		
		final Cursor cursor = sd.query("pic", null, null, null, null, null, null);
		
		SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,android.R.layout.simple_spinner_item,cursor,new String[]{"filename","description"},new int[]{android.R.id.text1,android.R.id.text2});
		
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		
		spinner.setAdapter(adapter);
		
		OnItemSelectedListener selectedListener = new OnItemSelectedListener() {

			@Override
			public void onItemSelected(AdapterView<?> arg0, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				cursor.moveToPosition(position);
				Toast.makeText(TestAndroidActivity.this, cursor.getString(2), Toast.LENGTH_SHORT).show();
				
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
				// TODO Auto-generated method stub
				
			}
		};
		
		spinner.setOnItemSelectedListener(selectedListener);
		
	}



	private void initDataBase(SQLiteDatabase sd2) {
    	
    	 ContentValues cv = new ContentValues();
    	
    	 cv.put("fileName", "pic1.jpg");
         cv.put("description", "圖片1");
         sd2.insert(table_name, "", cv);

         cv.put("fileName", "pic2.jpg");
         cv.put("description", "圖片2");
         sd2.insert(table_name, "", cv);

         cv.put("fileName", "pic3.jpg");
         cv.put("description", "圖片3");
         sd2.insert(table_name, "", cv);

         cv.put("fileName", "pic4.jpg");
         cv.put("description", "圖片4");
         sd2.insert(table_name, "", cv);

	}



	private void findView() {
     
		
		add = (Button)findViewById(R.id.add);
		delete = (Button)findViewById(R.id.delete);
		update = (Button)findViewById(R.id.update);
		select = (Button)findViewById(R.id.select);
		
		
	
		
		add.setOnClickListener(this);
		delete.setOnClickListener(this);
		update.setOnClickListener(this);
		select.setOnClickListener(this);
		
    }



	@Override
	public void onClick(View v) {
		
		  ContentValues cv = new ContentValues();
		  
          switch(v.getId()) {
                  
          case R.id.add:
        	  cv.put("filename", "filename");
        	  cv.put("description","description");
        	  long value_insert = sd.insert("pic", null, cv);
        	  if(-1 == value_insert)
        	  {
        		  Toast.makeText(this, "添加圖片失敗", Toast.LENGTH_SHORT).show();
        	  }
        	  else
        	  {
        		  Toast.makeText(this, "添加圖片成功", Toast.LENGTH_SHORT).show();
        	  }
        	  
        	  updateSpinner();
        	  
        	  break;
          case R.id.delete:
        	  
        	  long number = sd.delete("pic", "filename='pic2.jpg'", null);
        	  Toast.makeText(this, "刪除了"+number+"條記錄", Toast.LENGTH_SHORT).show();
        	  updateSpinner();
        	  
        	  break;
          case R.id.update:
        	  
        	  cv.put("filename", "hello");
        	  cv.put("description", "world");
        	  long number_update = sd.update("pic", cv, "filename='pic2.jpg'",null);
        	  Toast.makeText(this, number_update+"條記錄被更新", Toast.LENGTH_SHORT).show();
        	  updateSpinner();
        	  
        	  
        	  break;
          case R.id.select:
        	  
        	  Cursor c = sd.query("pic", null, null, null, null, null, null);
        	  Toast.makeText(this,
                      "當前共有" + c.getCount() + "條記錄，下面一一顯示：",
                      Toast.LENGTH_SHORT).show();
                //循環顯示
            for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
              Toast.makeText(this,
                              "第"+ c.getInt(0)  +"條數據，文件名是" + c.getString(1) + "，描述是"+c.getString(2),
                              Toast.LENGTH_SHORT).show();
                 }
               //更新下拉列表
                updateSpinner();
        	  
        	  break;
          }
	}
	


     @Override
     protected void onDestroy() {
             //this.unbindService(sc);
             //this.stopService(
             //                new Intent("jtapp.myservicesamples.myservice"));
    	     super.onDestroy();
             sd.delete(table_name, null, null);
             updateSpinner();
     }
     
     
	
	
}





package com.cor;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DbHelper extends SQLiteOpenHelper {

	public DbHelper(Context context, String name, CursorFactory factory,
			int version) {
		super(context, name, factory, version);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub
		
		String sql = "CREATE TABLE pic(_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,filename VARCHAR ,description VARCHAR)";
		db.execSQL(sql);
		
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		// TODO Auto-generated method stub
		
	}
	
	
	
}