将您自己的SQLite数据库添加到Android应用程序

我们如何将我们自己的SQLite数据库添加到一个android项目？

Answer 1

试试这个代码：

  public class DataBaseHelper extends SQLiteOpenHelper { private Context mycontext; //private String DB_PATH = mycontext.getApplicationContext().getPackageName()+"/databases/"; private static String DB_NAME = "(datbasename).sqlite"; //the extension may be .sqlite or .db public SQLiteDatabase myDataBase; /*private String DB_PATH = "/data/data/" + mycontext.getApplicationContext().getPackageName() + "/databases/";*/ public DataBaseHelper(Context context) throws IOException { super(context, DB_NAME, null, 1); this.mycontext = context; boolean dbexist = checkdatabase(); if (dbexist) { //System.out.println("Database exists"); opendatabase(); } else { System.out.println("Database doesn't exist"); createdatabase(); } } public void createdatabase() throws IOException { boolean dbexist = checkdatabase(); if (dbexist) { //System.out.println(" Database exists."); } else { this.getReadableDatabase(); try { copydatabase(); } catch (IOException e) { throw new Error("Error copying database"); } } } private boolean checkdatabase() { //SQLiteDatabase checkdb = null; boolean checkdb = false; try { String myPath = DB_PATH + DB_NAME; File dbfile = new File(myPath); //checkdb = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE); checkdb = dbfile.exists(); } catch (SQLiteException e) { System.out.println("Database doesn't exist"); } return checkdb; } 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("/data/data/(packagename)/databases/(datbasename).sqlite"); // transfer byte to inputfile to 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_READWRITE); } public synchronized void close() { if (myDataBase != null) { myDataBase.close(); } super.close(); }