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opener.java

    package com.example.camp;

    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;



    import android.app.Activity;
    import android.content.Context;
    import android.database.Cursor;
    import android.database.SQLException;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteException;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.os.Bundle;
    import android.util.Log;

    public class opener extends SQLiteOpenHelper {
        private static final String dbpath="\\data\\data\\com.example.camp\\databases\\";
        private static String dbname="mok";
        private SQLiteDatabase myDataBase;
        static String tname="javap";
        static String qn="ques";
        static String a="ans";
    private Context CON;

        public opener(Context context) {
            super(context, dbname, null, 3);
            this.CON=context;

        }
           public void createDataBase() throws IOException{

                boolean dbExist = checkDataBase();

                if(dbExist){

                    Log.e("sd", "donothing db exist");
                    //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 {
         Log.e("pt", "calling copy");
                        copyDataBase();

                    } catch (IOException e) {

                        throw new Error("Error copying database");

                    }
                }

            }






         private boolean checkDataBase(){

                SQLiteDatabase checkDB = null;
                Log.e("inside","chkdb");

                try{

                    Log.e("incd", "eroo");
                    String myPath =dbpath +dbname;
                    checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

                }catch(SQLiteException e){

                    Log.e("l","dexist");

                }

                if(checkDB != null){
                    Log.e("incd", "if");
                    checkDB.close();
                    Log.e("",""+checkDB);

                }

                return checkDB != null ? true : false;
            }
         private void copyDataBase() throws IOException{
             Log.e("inside","copydb");

                InputStream myInput = CON.getAssets().open(dbname);

                String outFileName = dbpath + dbname;

                //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 = dbpath + dbname;
                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) {

            }




        }

跳转.java

    package com.example.camp;

    import java.io.IOException;

    import android.app.Activity;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.os.Bundle;
    import android.util.Log;

    public class jump extends Activity  {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_jump);
            opener obj=new opener(this);
            final SQLiteDatabase sqdb = obj.getWritableDatabase();
            Log.e("ck1", "ok");

        try{
            Log.e("ck2", "ok");
            obj.createDataBase();
        }catch(IOException e){ 

            Log.e("I/O", e.toString());

        }


        try{

            obj.openDataBase();
        }catch(Exception e)
        {
            Log.e("I/O2", e.toString());
        }
    try{
           /*Cursor c = sqdb.query(opener.tname,
                new String[] { opener.qn, opener.a },
                null, null, null, null, null);

         while (c.moveToNext()) {
            // GET COLUMN INDICES + VALUES OF THOSE COLUMNS
            int id = c.getInt(c.getColumnIndex(opener.qn));
            String name =
            c.getString(c.getColumnIndex(opener.a));
            Log.i("LOG_TAG", "ROW " + id + " HAS NAME " + name);
            */
         //}\
         }catch(Exception e){ 

             Log.e("ck3",e.toString());
         }








        }}

堆栈跟踪

 08-15 03:22:44.030: I/dalvikvm(1149): threadid=3: reacting to signal 3
    08-15 03:22:44.160: I/dalvikvm(1149): Wrote stack traces to '/data/anr/traces.txt'
    08-15 03:22:44.330: E/ck1(1149): ok
    08-15 03:22:44.330: E/ck2(1149): ok
    08-15 03:22:44.330: E/inside(1149): chkdb
    08-15 03:22:44.340: E/incd(1149): eroo
    08-15 03:22:44.340: I/SqliteDatabaseCpp(1149): sqlite returned: error code = 14, msg = cannot open file at line 27701 of [8609a15dfa], db=/data/data/com.example.camp/databases/camprep
    08-15 03:22:44.340: I/SqliteDatabaseCpp(1149): sqlite returned: error code = 14, msg = os_unix.c: open() at line 27701 - "" errno=2 path=//\data\data\com.example.camp\databases\camprep, db=/data/data/com.example.camp/databases/camprep
    08-15 03:22:44.340: E/SqliteDatabaseCpp(1149): sqlite3_open_v2("\data\data\com.example.camp\databases\camprep", &handle, 1, NULL) failed
    08-15 03:22:44.351: E/SQLiteDatabase(1149): Failed to open the database. closing it.
    08-15 03:22:44.351: E/SQLiteDatabase(1149): android.database.sqlite.SQLiteCantOpenDatabaseException: unable to open database file
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1013)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:962)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at com.example.camp.opener.checkDataBase(opener.java:77)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at com.example.camp.opener.createDataBase(opener.java:37)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at com.example.camp.jump.onCreate(jump.java:24)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.Activity.performCreate(Activity.java:4465)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.os.Handler.dispatchMessage(Handler.java:99)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.os.Looper.loop(Looper.java:137)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at android.app.ActivityThread.main(ActivityThread.java:4424)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at java.lang.reflect.Method.invokeNative(Native Method)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at java.lang.reflect.Method.invoke(Method.java:511)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    08-15 03:22:44.351: E/SQLiteDatabase(1149):     at dalvik.system.NativeStart.main(Native Method)
    08-15 03:22:44.351: E/l(1149): dexist
    08-15 03:22:44.351: E/pt(1149): calling copy
    08-15 03:22:44.351: E/inside(1149): copydb
    08-15 03:22:44.360: E/unable(1149): copydbjava.io.FileNotFoundException: camprep
    08-15 03:22:44.360: D/AndroidRuntime(1149): Shutting down VM
    08-15 03:22:44.360: W/dalvikvm(1149): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
    08-15 03:22:44.370: E/AndroidRuntime(1149): FATAL EXCEPTION: main
    08-15 03:22:44.370: E/AndroidRuntime(1149): java.lang.Error: Error copying database
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at com.example.camp.opener.createDataBase(opener.java:56)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at com.example.camp.jump.onCreate(jump.java:24)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.Activity.performCreate(Activity.java:4465)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.os.Handler.dispatchMessage(Handler.java:99)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.os.Looper.loop(Looper.java:137)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at android.app.ActivityThread.main(ActivityThread.java:4424)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at java.lang.reflect.Method.invokeNative(Native Method)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at java.lang.reflect.Method.invoke(Method.java:511)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    08-15 03:22:44.370: E/AndroidRuntime(1149):     at dalvik.system.NativeStart.main(Native Method)
    08-15 03:22:44.530: I/dalvikvm(1149): threadid=3: reacting to signal 3
    08-15 03:22:44.560: I/dalvikvm(1149): Wrote stack traces to '/data/anr/traces.txt'
    08-15 03:22:44.979: I/dalvikvm(1149): threadid=3: reacting to signal 3
    08-15 03:22:44.989: I/dalvikvm(1149): Wrote stack traces to '/data/anr/traces.txt'

改变路径后它仍然没有开始。我已经找到了星迹。我'vw注意到filenotfound并且无法打开database.but文件在我项目的assets文件夹中。

4

0 回答 0