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) 저는 Android 프로그래밍의 초보자이며 약간의 문제가 있습니다. 간단한 데이터베이스 (Data Base를 준비했습니다.)를 작성 했으므로 전화의 app 폴더에 복사해야합니다. 나는 이것을위한 방법이있다. 에뮬레이터에서 앱을 실행하면 모든 기능이 작동하지만 앱을 휴대 전화에 복사하면 앱이 다운됩니다. 너 나 좀 도와 줄 수있어?) (휴대 전화에서는 응용 프로그램 오류가 발생하지만 에뮬레이터에서는 표시되지 않습니다.
dbAdapter baza = new dbAdapter(this);
baza.copyDatabase();
또는 baza.assetOpenDatabase; 이 dbAdapter입니다 :
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Application;
import android.content.ContentValues;
import android.content.Context;
import android.content.ContextWrapper;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class dbAdapter {
private static final String DB_NAME = "names2.db";
private static final int DB_VERSION = 1;
private static final String DB_TABLE = "names";
String DB_PATH;
public static final String KEY_ID = "_id";
public static final String KEY_NAME = "name";
public static final int NAME_COLUMN = 1;
public static final String KEY_SEX = "sex";
public static final int SEX_COLUMN = 2;
public static final String KEY_RACE = "race";
public static final int RACE_COLUMN = 3;
private SQLiteDatabase db;
private final Context context;
private DatabaseHelper myDatabaseHelper;
public dbAdapter(Context _context){
context = _context;
//DB_PATH = context.getApplicationContext().getFilesDir().getPath();
DB_PATH = context.getFilesDir().getPath()+"/databases/";
myDatabaseHelper = new DatabaseHelper(_context,DB_NAME,null,DB_VERSION);
}
public dbAdapter open(){
db = myDatabaseHelper.getReadableDatabase();
return this;
}
public void close(){
db.close();
}
public long insert(rekord _rekord){
ContentValues newRekord = new ContentValues();
newRekord.put(KEY_NAME, _rekord.getName());
newRekord.put(KEY_SEX, _rekord.getSex());
newRekord.put(KEY_RACE, _rekord.getRace());
return db.insert(DB_TABLE, null, newRekord);
}
public String getData(String sex, String race) {
Cursor mycursor = db.rawQuery("SELECT name FROM names WHERE sex ="+sex+" AND race="+race+" ORDER BY RANDOM() LIMIT 1", null);
if(mycursor.moveToFirst()){ //Edited based on suggestion from SAM
String strCatName = mycursor.getString(mycursor.getColumnIndex(KEY_NAME));
return strCatName;
} else {
return null;
}
// return db.rawQuery("SELECT name FROM names WHERE sex =1 ORDER BY RANDOM() LIMIT 1", new String[]{"name"});
}
public void copyDatabase() throws IOException{ //niby kopiowanie bazy danych. Nie wiem czy dobre bo nie chce działać
//Open your local db as the input stream
InputStream myInput = context.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 del(){
File file = new File(DB_PATH+DB_NAME);
if(file.exists())
file.delete();
}
public SQLiteDatabase assetOpenDatabase() {
File dbFile = context.getDatabasePath(DB_NAME);
if (!dbFile.exists()) {
try {
assetCopyDatabase(dbFile);
} catch (IOException e) {
throw new RuntimeException("Error creating source database", e);
}
}
return SQLiteDatabase.openDatabase(dbFile.getPath(), null, SQLiteDatabase.OPEN_READONLY);
}
private void assetCopyDatabase(File dbFile) throws IOException {
InputStream is = context.getAssets().open(DB_NAME);
OutputStream os = new FileOutputStream(dbFile);
byte[] buffer = new byte[1024];
while (is.read(buffer) > 0) {
os.write(buffer);
}
os.flush();
os.close();
is.close();
}
//--------------------------------------------------------
class DatabaseHelper extends SQLiteOpenHelper{
public DatabaseHelper(Context context, String name, CursorFactory factory, int version){
super(context,name,factory,version);
}
@Override
public void onCreate(SQLiteDatabase _db){
//_db.execSQL("CREATE TABLE names(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, sex NUMERIC NOT NULL, race NUMERIC NOT NULL)");
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVer, int newVer){
_db.execSQL("DROP TABLE IF EXISTS "+DB_TABLE);
onCreate(_db);
}
}
}
그리고 내가 파일을 복사하는 방법 같은 효과.
당신이 당신의 DB 종자 사용중인 파일을 찾을 수없는Ehh, now I have error on emulator too...
06-11 21:31:20.510: E/AndroidRuntime(537): FATAL EXCEPTION: main
06-11 21:31:20.510: E/AndroidRuntime(537): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.namesgenerator/com.example.namesgenerator.sex}: java.lang.RuntimeException: Error creating source database
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.os.Looper.loop(Looper.java:123)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread.main(ActivityThread.java:3683)
06-11 21:31:20.510: E/AndroidRuntime(537): at java.lang.reflect.Method.invokeNative(Native Method)
06-11 21:31:20.510: E/AndroidRuntime(537): at java.lang.reflect.Method.invoke(Method.java:507)
06-11 21:31:20.510: E/AndroidRuntime(537): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-11 21:31:20.510: E/AndroidRuntime(537): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-11 21:31:20.510: E/AndroidRuntime(537): at dalvik.system.NativeStart.main(Native Method)
06-11 21:31:20.510: E/AndroidRuntime(537): Caused by: java.lang.RuntimeException: Error creating source database
06-11 21:31:20.510: E/AndroidRuntime(537): at com.example.namesgenerator.dbAdapter.assetOpenDatabase(dbAdapter.java:108)
06-11 21:31:20.510: E/AndroidRuntime(537): at com.example.namesgenerator.sex.onCreate(sex.java:39)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-11 21:31:20.510: E/AndroidRuntime(537): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
06-11 21:31:20.510: E/AndroidRuntime(537): ... 11 more
06-11 21:31:20.510: E/AndroidRuntime(537): Caused by: java.io.FileNotFoundException: /data/data/com.example.namesgenerator/databases/names2.db (No such file or directory)
06-11 21:31:20.510: E/AndroidRuntime(537): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
06-11 21:31:20.510: E/AndroidRuntime(537): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
06-11 21:31:20.510: E/AndroidRuntime(537): at java.io.FileOutputStream.<init>(FileOutputStream.java:94)
06-11 21:31:20.510: E/AndroidRuntime(537): at java.io.FileOutputStream.<init>(FileOutputStream.java:66)
06-11 21:31:20.510: E/AndroidRuntime(537): at com.example.namesgenerator.dbAdapter.assetCopyDatabase(dbAdapter.java:117)
06-11 21:31:20.510: E/AndroidRuntime(537): at com.example.namesgenerator.dbAdapter.assetOpenDatabase(dbAdapter.java:106)
06-11 21:31:20.510: E/AndroidRuntime(537): ... 14 more
logcat에서 스택 추적을 붙여 넣으십시오. –