我做了一个安卓词典应用程序。我创建了一个名为“kamusJawa.sqlite”的数据库并将其复制到资产文件夹中。我尝试了此链接Own Database in Assets Folder on Android Eclipse Project 中的代码
这是我的数据库管理器类：
package com.kamusJI;
public class DBHelper extends SQLiteOpenHelper{
private static String DBPATH = "/data/data/com.kamusJI/databases/";
private static String DBNAME = "kamusJawa.sqlite";
private SQLiteDatabase DBSQ;
private final Context KJICtx;
public DBHelper(Context context) throws IOException {
super(context, DBNAME, null, 1);
this.KJICtx = context;
// TODO Auto-generated constructor stub
boolean dbexist = cekDB();
if (dbexist) {
//System.out.println("Database exists");
openDB();
} else {
System.out.println("Database doesn't exist");
createDB();
}
}
public void createDB() throws IOException{
boolean dbExist = cekDB();
if(!dbExist){
this.getReadableDatabase();
try{
salinDB();
}catch (IOException e){
throw new Error("Gagal menyalin database");
}
}
}
boolean cekDB() {
//SQLiteDatabase cekDatabase = null;
boolean cekdb = false;
try{
String path = DBPATH + DBNAME;
File dbfile = new File(path);
//cekDatabase = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);
cekdb = dbfile.exists();
}catch(SQLException e){
System.out.println("Database tidak ada");
}
return cekdb;
//return cekDatabase !=null ? true : false;
}
private void salinDB() throws IOException{
AssetManager AM = KJICtx.getAssets();
File DbFile = new File(DBPATH+DBNAME);
InputStream in = KJICtx.getAssets().open(DBNAME);
//OutputStream out = new FileOutputStream(DbFile);
OutputStream out = new FileOutputStream("/data/data/com.kamusJI/databases/kamusJawa.sqlite");
DbFile.createNewFile();
byte[] b = new byte[1024];
int i, r;
String[] Files = AM.list("");
Arrays.sort(Files);
i= 1;
String fdb = String.format("kamusJawa.db.00%d", i);
while(Arrays.binarySearch(Files, fdb)>=0){
//InputStream in = AM.open(fdb);
while(( r = in.read(b))>0)
out.write(b,0,r);
in.close();
i++;
fdb = String.format("kamusJawa.db.00%d", i);
}
out.flush();
out.close();
}
public void openDB() throws SQLException{
String path = DBPATH+DBNAME;
DBSQ = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);
}
public synchronized void close(){
if(DBSQ !=null)
DBSQ.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
}
这是我的主要课程：
package com.kamusJI;
public class KJI extends ListActivity {
private KJI this_class = this;
String[] Menu = {"Basa Jawa", "Bahasa Indonesia", "Tambah Data"};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setListAdapter(new ArrayAdapter<String>(this, R.layout.row, R.id.Cari, Menu));
ListView lv = getListView();
lv.setTextFilterEnabled(false);
/* Defines On Item Click callback method */
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Intent action = null;
switch(position) {
case 0:
case 1:
action = new Intent(getApplicationContext(), Cari.class);
action.putExtra("MODE", position);
break;
case 2:
action = new Intent(getApplicationContext(), Tambah.class);
action.putExtra("MODE", position);
break;
case 3:
finish();
return;
}
startActivity(action);
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
}
public void InitDatabase() {
AsyncTask<String, Void, String> InitDB = new AsyncTask<String, Void, String>() {
Dialog progress = null;
String msg;
DBHelper dbhelper;
@Override
protected void onPreExecute() {
try {
dbhelper = new DBHelper(this_class);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (!dbhelper.cekDB())
progress = ProgressDialog.show(this_class, "", "Installing Database.\nPlease wait.");
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
try {
dbhelper.createDB();
msg = "Database successfully installed.";
} catch (IOException ioe) {
msg = "Database installation failed.";
}
return msg;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (progress!=null) {
progress.dismiss();
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
}
}
};
InitDB.execute(new String());
}
}
当我运行我的应用程序时，然后我转到文件资源管理器，我找不到 data/data/com.kamusJI/databases。怎么会这样？