<?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>界面布局一个按钮，一个TextView,点击按钮，从程序自带的数据库中读取一条记录 数据库类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.easymorse/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 SQLiteDatabase openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
return myDataBase;
}
@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.
}/////////////////主页面代码package com.easymorse;
import java.io.IOException;
import android.app.Activity;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
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)
{
SQLiteDatabase dicData;
DataBaseHelper myDbHelper = new DataBaseHelper(null);
myDbHelper = new DataBaseHelper(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
dicData=myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
String sql = "select * from Question_DATA where id=1";
Cursor cursor =dicData.rawQuery(sql, null);
if (cursor.getCount() > 0)
{
//必须使用moveToFirst方法将记录指针移动到第1条记录的位置
cursor.moveToFirst();
String result = cursor.getString(cursor.getColumnIndex("Question_Content"));
TextView tv=(TextView)SHARKActivity.this.findViewById(R.id.textView1);
tv.setText(result);
}
}
}
出的错误
07-29 06:17:08.109: ERROR/Database(15257): SELECT locale FROM android_metadata failed07-29 06:17:08.149: ERROR/Database(15257): Failed to setLocale() when constructing, closing the database07-29 06:17:08.149: ERROR/Database(15257): android.database.sqlite.SQLiteException: no such table: android_metadata07-29 06:17:08.149: ERROR/Database(15257): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)07-29 06:17:08.149: ERROR/Database(15257): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:1950)
07-29 06:17:08.149: ERROR/Database(15257): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1818)07-29 06:17:08.149: ERROR/Database(15257): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:817)07-29 06:17:08.149: ERROR/Database(15257): at com.easymorse.DataBaseHelper.checkDataBase(DataBaseHelper.java:74)07-29 06:17:08.149: ERROR/Database(15257): at com.easymorse.DataBaseHelper.createDataBase(DataBaseHelper.java:41)07-29 06:17:08.149: ERROR/Database(15257): at com.easymorse.SHARKActivity.onClick(SHARKActivity.java:38)
private static String DB_PATH = "/data/data/com.easymorse/databases/";
private static String DB_NAME = "f_dic2.db";
f_dic2.db里的Question_DATA表的Question_Content字段
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);试试
参考：http://stackoverflow.com/questions/2528489/no-such-table-android-metadata-whats-the-problem
07-29 07:02:59.860: ERROR/Database(23994): Failed to setLocale() when constructing, closing the database
07-29 07:02:59.860: ERROR/Database(23994): android.database.sqlite.SQLiteException: no such table: android_metadata
07-29 07:02:59.860: ERROR/Database(23994): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
07-29 07:02:59.860: ERROR/Database(23994): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:1950)
07-29 07:02:59.860: ERROR/Database(23994): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1818)
07-29 07:02:59.860: ERROR/Database(23994): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:817)
07-29 07:02:59.860: ERROR/Database(23994): at com.easymorse.DataBaseHelper.openDataBase(DataBaseHelper.java:127)
07-29 07:02:59.860: ERROR/Database(23994): at com.easymorse.SHARKActivity.onClick(SHARKActivity.java:34)
07-29 07:02:59.860: ERROR/Database(23994): at android.view.View.performClick(View.java:2408)
http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/
adb shell
cd /data/data/com.easymorse/databases
sqlite3 f_dic2.db
sqlite> CREATE TABLE "android_metadata" ("locale" TEXT DEFAULT 'en_US');
sqlite> INSERT INTO "android_metadata" VALUES ('en_US');
sqlite> .tables
Question_DATA android_metadata
sqlite> .quite
是的 应用程序需要这个表 高版本的API会自动生成 ，没有就要自己加了。
試出來了... 代碼在此... 請參考http://www.box.net/shared/u3oictqj599kfbfepm5j可以將 data/data/.../databases/dbtest 刪除再運行...確認無誤