//The Android's default system path of your application database. private static String DB_PATH = "/data/data/com.IBO/databases/";
private static String DB_NAME = "f_dic2.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/** * Constructor * Takes and keeps a reference of the passed context in order to access to the application assets and resources. * @param context */ public DataBaseHelper(Context context) {
//By calling this method and empty database will be created into the default system path //of your application so we are gonna be able to overwrite that database with our database. this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
} }
}
/** * Check if the database already exist to avoid re-copying the file each time you open the application. * @return true if it exists, false if it doesn't */ private boolean checkDataBase(){
/** * Copies your database from your local assets-folder to the just created empty database in the * system folder, from where it can be accessed and handled. * This is done by transfering bytestream. * */ private void copyDataBase() throws IOException{
//Open your local db as the input stream InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer))>0){ myOutput.write(buffer, 0, length); }
//Close the streams myOutput.flush(); myOutput.close(); myInput.close();
@Override public void onCreate(SQLiteDatabase db) {
}
@Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
// Add your public helper methods to access and get content from the database. // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy // to you to create adapters for your views.
http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/
但是会出错package com.easymorse;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;public class SHARKActivity extends Activity implements OnClickListener{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View newButton=this.findViewById(R.id.button1);
newButton.setOnClickListener(SHARKActivity.this);
}
public void onClick(View view)
{
DataBaseHelper myDbHelper = new DataBaseHelper(null);
myDbHelper = new DataBaseHelper(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
}
}
//////////////////DataBaseHelper///////////////////
package com.easymorse;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper; public class DataBaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.IBO/databases/";
private static String DB_NAME = "f_dic2.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
}main.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>
============================================================
关键的三个提示
private static String DB_PATH = "/data/data/com.easymorse/databases/";
private static String DB_NAME = "f_dic2.db";//改成你的数据库文件
f_dic2.db是我数据库文件的名字
这个路径是我这个模拟器里已经存在的，这样不可以吗？
String sql = "select * from Question_DATA where id=1";
Cursor cursor =dicData.rawQuery(sql, null);
cursor.moveToFirst();
String result = cursor.getString(cursor.getColumnIndex("Question_Content"));
TextView tv=(TextView)SHARKActivity.this.findViewById(R.id.textView1);
tv.setText(result);CREATE TABLE [Question_DATA] (
[id] INTEGER,
[Question_Content] CHAR NOT NULL,
[Answer_A] CHAR NOT NULL,
[Answer_B] CHAR NOT NULL,
[Answer_C] CHAR,
[Answer_D] CHAR,
[ANSWER] CHAR NOT NULL,
[Undif_field1] CHAR,
[Undif_field2] CHAR)
--------------------------------------------<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1">
<Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<TextView android:layout_height="wrap_content" android:id="@+id/textView1" android:text="TextView" android:layout_width="match_parent" android:layout_weight="0.11"></TextView>
</LinearLayout>就是实现一点按钮，从Question_DATA表取出id=1的记录，并将该记录的“Question_Content”的字段的内容在TextView上显示出来
但是报错：
07-29 10:41:24.691: ERROR/AndroidRuntime(4795):
android.database.sqlite.SQLiteException: no such table: Question_DATA: , while compiling: select * from Question_DATA where id=1不知是何原因
查看下有Question_DATA这个表吗
弄好数据库之后拷贝到
assets文件下
---------------------
没用过你的方法，让俺研究下
Android版本是2.2
SQLite Expert 3.33
又用.databases也没有我要的数据库
我的模式是apk自带数据库，应该不会放到Android自己的SQLite上吧
http://www.box.net/shared/u3oictqj599kfbfepm5j数据库名称dbtest
从 assets 目录移至 /data/data/com.tst.copysql/dbtest