我在我的应用程序中使用数据库，但我在 SQLite 浏览器中创建数据库，并在我的应用程序中使用此链接的指南进行了尝试，当我尝试在我的手机上运行 Eclipse 项目时，我的应用程序成功调用数据库，但在另一种情况下我尝试从android中的文件夹bin复制我的apk应用程序并安装它..当我安装apk文件时，我的应用程序错误无法调用数据库..并且再也不会调用数据库..请帮助我..谢谢我的代码：
数据库助手.java
public class DataBaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.apps.visitkuningan/databases/";
private static String DB_NAME = "db_keterangan.sqlite3";
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.
}
这是使用查询的代码：
public class KetWisata extends Activity{
Intent arah;
String tampilarah;
String tempat;
Bundle bundel2 = new Bundle();
Cursor cur;
Cursor cur2;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.ket_data);
String tampil = getIntent().getExtras().getString("key");
ImageView img1 = (ImageView) findViewById(R.id.gambar);
TextView nama = (TextView) findViewById(R.id.nama);
TextView alamat = (TextView) findViewById(R.id.alamat);
TextView keterangan = (TextView) findViewById(R.id.keterangan);
Button arahkan = (Button) findViewById(R.id.arahkan);
// Create the database
DataBaseHelper myDbHelper = new DataBaseHelper(
this.getApplicationContext());
myDbHelper = new DataBaseHelper(this);
SQLiteDatabase db = myDbHelper.getReadableDatabase();
arahkan.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
startActivity(arah);
}
});
if(tampil.equalsIgnoreCase("wis_balongdalem"))
{
img1.setBackgroundResource(R.drawable.wis_balong);
nama.setText("Balong Dalem");
tempat="Balong Dalem";
tampilarah ="Balong Dalem";
}
if(tampil.equalsIgnoreCase("wis_curugbangkong"))
{
img1.setBackgroundResource(R.drawable.wis_bangkong);
nama.setText("Curug Bangkong");
tempat="Curug Bangkong";
tampilarah ="Curug Bangkong";
}
if(tampil.equalsIgnoreCase("wis_buperciberem"))
{
img1.setBackgroundResource(R.drawable.wis_ciberem);
nama.setText("Bumi Perkemahan Cibeureum");
tempat="Bumi Perkemahan Cibeureum";
tampilarah ="Bumi Perkemahan Cibeureum";
}
if(tampil.equalsIgnoreCase("wis_cibulan"))
{
img1.setBackgroundResource(R.drawable.wis_cibulan);
nama.setText("Wisata Cibulan");
tempat="Cibulan";
tampilarah ="Cibulan";
}
if(tampil.equalsIgnoreCase("wis_balongcicerem"))
{
img1.setBackgroundResource(R.drawable.wis_situ);
nama.setText("Situ Cicereum");
tempat="Situ Ciceureum";
tampilarah ="Situ Ciceureum";
}
if(tampil.equalsIgnoreCase("wis_balongcigugur"))
{
img1.setBackgroundResource(R.drawable.wis_cigugur);
nama.setText("Wisata Cigugur");
tempat="Wisata Cigugur";
tampilarah ="Wisata Cigugur";
}
if(tampil.equalsIgnoreCase("wis_curugcilengkrang"))
{
img1.setBackgroundResource(R.drawable.wis_cilengkrang3);
nama.setText("Lembah Cilengkrang");
tempat="Lembah Cilengkrang";
tampilarah ="Lembah Cilengkrang";
}
if(tampil.equalsIgnoreCase("wis_cipari"))
{
img1.setBackgroundResource(R.drawable.wis_cipari2);
nama.setText("Taman Purbakala Cipari");
tempat="Taman Purbakala Cipari";
tampilarah ="Taman Purbakala Cipari";
}
if(tampil.equalsIgnoreCase("wis_balongdarmaloka"))
{
img1.setBackgroundResource(R.drawable.wis_darmaloka2);
nama.setText("Balong Darmaloka");
tempat="Balong Darmaloka";
tampilarah ="Balong Darmaloka";
}
if(tampil.equalsIgnoreCase("wis_linggarjati"))
{
img1.setBackgroundResource(R.drawable.wis_linggarjat2i);
nama.setText("Linggarjati Indah");
tempat="Linggarjati Indah";
tampilarah ="Linggarjati Indah";
}
if(tampil.equalsIgnoreCase("wis_guamaria"))
{
img1.setBackgroundResource(R.drawable.wis_guamaria);
nama.setText("Gua Maria");
tempat="Gua Maria";
tampilarah ="Gua Maria";
}
if(tampil.equalsIgnoreCase("wis_gedungnaskah"))
{
img1.setBackgroundResource(R.drawable.wis_muslinggar2);
nama.setText("Gedung Perundingan Linggarjati");
tempat="Gedung Perundingan Linggarjati";
tampilarah ="Gedung Perundingan Linggarjati";
}
if(tampil.equalsIgnoreCase("wis_buperpalutungan"))
{
img1.setBackgroundResource(R.drawable.wis_palutungan2);
nama.setText("Bumi Perkemahan Palutungan");
tempat="Bumi Perkemahan Palutungan";
tampilarah ="Bumi Perkemahan Palutungan";
}
if(tampil.equalsIgnoreCase("wis_buperpaniis"))
{
img1.setBackgroundResource(R.drawable.wis_paniis2);
nama.setText("Bumi Perkemahan Paniis");
tempat="Bumi Perkemahan Paniis";
tampilarah ="Bumi Perkemahan Paniis";
}
if(tampil.equalsIgnoreCase("wis_paseban"))
{
img1.setBackgroundResource(R.drawable.wis_paseban);
nama.setText("Gedung Merapat Lima");
tempat="Gedung Merapat Lima";
tampilarah ="Gedung Merapat Lima";
}
if(tampil.equalsIgnoreCase("wis_makamvanbeck"))
{
img1.setBackgroundResource(R.drawable.wis_makamvanbeck);
nama.setText("Situs Makam Van Beck");
tempat="Situs Makam Van Beck";
tampilarah ="Situs Makam Van Back";
}
if(tampil.equalsIgnoreCase("wis_sanggariang"))
{
img1.setBackgroundResource(R.drawable.wis_sanggariang2);
nama.setText("Sanggariang");
tempat="Sanggariang";
tampilarah ="Sanggariang";
}
if(tampil.equalsIgnoreCase("wis_sangkanurip"))
{
img1.setBackgroundResource(R.drawable.wis_sangkanurip);
nama.setText("Sangkanurip Alami");
tempat="Sangkanurip Alami";
tampilarah ="Sangkanurip Alami";
}
if(tampil.equalsIgnoreCase("wis_curugsidomba"))
{
img1.setBackgroundResource(R.drawable.wis_sidomba2);
nama.setText("Sidomba");
tempat="Sidomba";
tampilarah ="Sidomba";
}
if(tampil.equalsIgnoreCase("wis_talagaremis"))
{
img1.setBackgroundResource(R.drawable.wis_talagaremis2);
nama.setText("Talagaremis");
tempat="Talagaremis";
tampilarah ="Talagaremis";
}
if(tampil.equalsIgnoreCase("wis_tngc"))
{
img1.setBackgroundResource(R.drawable.wis_tngc);
nama.setText("Taman Nasional Gunung Ciremai");
tempat="Taman Nasional Gunung Ciremai";
tampilarah ="Taman Nasional Gunung Ciremai";
}
if(tampil.equalsIgnoreCase("wis_wadukdarma"))
{
img1.setBackgroundResource(R.drawable.wis_waduk);
nama.setText("Waduk Darma");
tempat="Waduk Darma";
tampilarah ="Waduk Darma";
}
if(tampil.equalsIgnoreCase("wis_tirtaagung"))
{
img1.setBackgroundResource(R.drawable.wis_tirtaagung);
nama.setText("Tirta Agung Mas");
tempat="Tirta Agung Mas";
tampilarah ="Tirta Agung Mas";
}
if(tampil.equalsIgnoreCase("wis_sangkanaqua"))
{
img1.setBackgroundResource(R.drawable.wis_sangkanaqua);
nama.setText("Sangkan Resort Aqua Park");
tempat="Sangkan Resort Aqua Park";
tampilarah ="Sangkan Resort Aqua Park";
}
if(tampil.equalsIgnoreCase("wis_talaganilem"))
{
img1.setBackgroundResource(R.drawable.wis_talaganilem);
nama.setText("Talaga Nilem");
tempat="Talaga Nilem";
tampilarah ="Talaga Nilem";
}
cur = db.rawQuery("SELECT keterangan FROM KETERANGAN_WIS WHERE nama_tempat='" + tempat + "';", null);
cur2 = db.rawQuery("SELECT alamat FROM KETERANGAN_WIS WHERE nama_tempat='" + tempat + "';", null);
cur.moveToPosition(0);
cur2.moveToPosition(0);
keterangan.append(cur.getString(0));
alamat.append(cur2.getString(0));
// Close
myDbHelper.close();
bundel2.putString("key", tampilarah);
arah = new Intent(KetWisata.this, Arahkan.class);
arah.putExtras(bundel2);
}
}
请大家帮帮我.. !!