SQLite與AutoCompleteTextView結合使用

取SQLite中的數據顯示在AutoCompleteTextView中,支持動態加入SQLite中不存在的數據.

package zhang.ya;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.TextView;

public class Test00 extends Activity implements TextWatcher, OnClickListener
{
    private final String DATABASE_PATH = android.os.Environment.getExternalStorageDirectory().getAbsolutePath()
            + "/course_name";
    private AutoCompleteTextView courseName;
    private final String DATABASE_FILENAME = "course_name.db3";
    private SQLiteDatabase database;
    private Button btnSelectWord;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        database = openDatabase();
        courseName = (AutoCompleteTextView) findViewById(R.id.courseName);
        courseName.setThreshold(1);
        courseName.addTextChangedListener(this);
        btnSelectWord = (Button) findViewById(R.id.buttonName);
        btnSelectWord.setOnClickListener(this);
    }

    public class CourseNameAdapter extends CursorAdapter
    {
        private LayoutInflater layoutInflater;

        @Override
        public CharSequence convertToString(Cursor cursor)
        {
            return cursor == null ? "" : cursor.getString(cursor.getColumnIndex("course_name"));
        }

        private void setView(View view, Cursor cursor)
        {
            TextView tvWordItem = (TextView) view;
            tvWordItem.setText(cursor.getString(cursor.getColumnIndex("course_name")));
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor)
        {
            setView(view, cursor);
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent)
        {
            View view = layoutInflater.inflate(R.layout.word_list_item, null);
            setView(view, cursor);
            return view;
        }

        public CourseNameAdapter(Context context, Cursor c, boolean autoRequery)
        {
            super(context, c, autoRequery);
            layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }
    }

    //輸入爲空則使得確定按鈕失效,只有輸入了數據才使得按鈕處於活動狀態
    @Override
    public void afterTextChanged(Editable s)
    {
        Log.i("zhangya", "textchage");
        String contentStr = s.toString();

        if (contentStr == null || contentStr.length() <= 0)//判斷contentStr是否爲空,判斷字符串是否爲空典型寫法
        {
            Log.i("zhangya", "afterTextChanged null");
            btnSelectWord.setEnabled(false);//爲空則不是能按鈕

        } else
        {
            Log.i("zhangya", "afterTextChanged not null");
            btnSelectWord.setEnabled(true);
            Cursor cursor = database.rawQuery("select * from course_name where course_name like ?", new String[]
            { contentStr + "%" });

            CourseNameAdapter dictionaryAdapter = new CourseNameAdapter(this, cursor, true);
            courseName.setAdapter(dictionaryAdapter);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after)
    {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count)
    {

    }

    private SQLiteDatabase openDatabase()
    {
        try
        {
            String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME;
            File dir = new File(DATABASE_PATH);
            if (!dir.exists())
                dir.mkdir();
            if (!(new File(databaseFilename)).exists())
            {
                InputStream is = getResources().openRawResource(R.raw.course_name);
                FileOutputStream fos = new FileOutputStream(databaseFilename);
                byte[] buffer = new byte[8192];
                int count = 0;
                while ((count = is.read(buffer)) > 0)
                {
                    fos.write(buffer, 0, count);
                }

                fos.close();
                is.close();
            }
            SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null);
            return database;
        } catch (Exception e)
        {
        }
        return null;
    }

    @Override
    public void onClick(View v)
    {
        String sql = "select * from course_name where course_name=?";
        Cursor cursor = database.rawQuery(sql, new String[]
        { courseName.getText().toString() });
        if (cursor.getCount() == 0)//沒有同名記錄,則插入數據
        {
            sql = "insert into course_name(course_name)values(?)";
            database.execSQL(sql, new Object[]
            { courseName.getText().toString() });
        } else
        {
            Log.i("zhangya", "else");
        }
        cursor.moveToFirst();

    }

}

package zhang.ya;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.TextView;

public class Test00 extends Activity implements TextWatcher, OnClickListener
{
	private final String DATABASE_PATH = android.os.Environment.getExternalStorageDirectory().getAbsolutePath()
			+ "/course_name";
	private AutoCompleteTextView courseName;
	private final String DATABASE_FILENAME = "course_name.db3";
	private SQLiteDatabase database;
	private Button btnSelectWord;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);
		database = openDatabase();
		courseName = (AutoCompleteTextView) findViewById(R.id.courseName);
		courseName.setThreshold(1);
		courseName.addTextChangedListener(this);
		btnSelectWord = (Button) findViewById(R.id.buttonName);
		btnSelectWord.setOnClickListener(this);
	}

	public class CourseNameAdapter extends CursorAdapter
	{
		private LayoutInflater layoutInflater;

		@Override
		public CharSequence convertToString(Cursor cursor)
		{
			return cursor == null ? "" : cursor.getString(cursor.getColumnIndex("course_name"));
		}

		private void setView(View view, Cursor cursor)
		{
			TextView tvWordItem = (TextView) view;
			tvWordItem.setText(cursor.getString(cursor.getColumnIndex("course_name")));
		}

		@Override
		public void bindView(View view, Context context, Cursor cursor)
		{
			setView(view, cursor);
		}

		@Override
		public View newView(Context context, Cursor cursor, ViewGroup parent)
		{
			View view = layoutInflater.inflate(R.layout.word_list_item, null);
			setView(view, cursor);
			return view;
		}

		public CourseNameAdapter(Context context, Cursor c, boolean autoRequery)
		{
			super(context, c, autoRequery);
			layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		}
	}

	//輸入爲空則使得確定按鈕失效,只有輸入了數據才使得按鈕處於活動狀態
	@Override
	public void afterTextChanged(Editable s)
	{
		Log.i("zhangya", "textchage");
		String contentStr = s.toString();
		
		if (contentStr == null || contentStr.length() <= 0)//判斷contentStr是否爲空,判斷字符串是否爲空典型寫法
		{
			Log.i("zhangya", "afterTextChanged null");
			btnSelectWord.setEnabled(false);//爲空則不是能按鈕

		} else
		{
			Log.i("zhangya", "afterTextChanged not null");
			btnSelectWord.setEnabled(true);
			Cursor cursor = database.rawQuery("select * from course_name where course_name like ?", new String[]
			{ contentStr + "%" });

			CourseNameAdapter dictionaryAdapter = new CourseNameAdapter(this, cursor, true);
			courseName.setAdapter(dictionaryAdapter);
		}
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count, int after)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count)
	{

	}

	private SQLiteDatabase openDatabase()
	{
		try
		{
			String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME;
			File dir = new File(DATABASE_PATH);
			if (!dir.exists())
				dir.mkdir();
			if (!(new File(databaseFilename)).exists())
			{
				InputStream is = getResources().openRawResource(R.raw.course_name);
				FileOutputStream fos = new FileOutputStream(databaseFilename);
				byte[] buffer = new byte[8192];
				int count = 0;
				while ((count = is.read(buffer)) > 0)
				{
					fos.write(buffer, 0, count);
				}

				fos.close();
				is.close();
			}
			SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null);
			return database;
		} catch (Exception e)
		{
		}
		return null;
	}

	@Override
	public void onClick(View v)
	{
		String sql = "select * from course_name where course_name=?";
		Cursor cursor = database.rawQuery(sql, new String[]
		{ courseName.getText().toString() });
		if (cursor.getCount() == 0)//沒有同名記錄,則插入數據
		{
			sql = "insert into course_name(course_name)values(?)";
			database.execSQL(sql, new Object[]
			{ courseName.getText().toString() });
		} else
		{
			Log.i("zhangya", "else");
		}
		cursor.moveToFirst();

	}

}

1.未輸入時狀態:       

2.輸入後: