Android 导入数据库后，从未对数据库显式调用close（）

我的应用程序中出现以下错误。但是，这个错误不会使我的应用程序崩溃。尽管如此，我知道是什么导致了这个错误，但不知道如何修复它。我之所以更加注意这个错误，是因为我正在将数据库从Asset文件夹处理到/data/文件夹。我在整个应用程序中使用相同的代码，以确保数据库存在，如果不再次复制它的话。如果用户错误地删除了数据库。这就是我使用该代码的原因（我将在错误下方跳过它）。我做了一项研究，这可能是我的应用程序因内存不足错误而崩溃的原因之一。不确定这是否也会导致内存泄漏。请帮帮我。正如我之前所说，在出现outofmemory错误之前，该应用程序工作正常。我想修复从这个开始发现的所有错误

错误：

           01-08 17:22:44.326: E/Database(414): close() was never explicitly called on database '/data/data/com.drakeillusion.yao1/databases/YAOMasterDB.db' 
           01-08 17:22:44.326: E/Database(414): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
           01-08 17:22:44.326: E/Database(414):     at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1810)
           01-08 17:22:44.326: E/Database(414):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:817)
           01-08 17:22:44.326: E/Database(414):     at com.example.yao.YAOMySQLiteHelper.openDataBase(YAOMySQLiteHelper.java:328)
           01-08 17:22:44.326: E/Database(414):     at com.example.yao.SplashActivity.copydbfromassest(SplashActivity.java:128)
           01-08 17:22:44.326: E/Database(414):     at com.example.yao.SplashActivity.onCreate(SplashActivity.java:68)
           01-08 17:22:44.326: E/Database(414):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
           01-08 17:22:44.326: E/Database(414):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
           01-08 17:22:44.326: E/Database(414):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
           01-08 17:22:44.326: E/Database(414):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
           01-08 17:22:44.326: E/Database(414):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
           01-08 17:22:44.326: E/Database(414):     at android.os.Handler.dispatchMessage(Handler.java:99)
           01-08 17:22:44.326: E/Database(414):     at android.os.Looper.loop(Looper.java:123)
           01-08 17:22:44.326: E/Database(414):     at android.app.ActivityThread.main(ActivityThread.java:4627)
           01-08 17:22:44.326: E/Database(414):     at java.lang.reflect.Method.invokeNative(Native Method)
           01-08 17:22:44.326: E/Database(414):     at java.lang.reflect.Method.invoke(Method.java:521)
           01-08 17:22:44.326: E/Database(414):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
           01-08 17:22:44.326: E/Database(414):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
           01-08 17:22:44.326: E/Database(414):     at dalvik.system.NativeStart.main(Native Method)

这是我的“DatabaseHelper”，名为YAOMySQLiteHelper。 YAOMySQLiteHelper包含大量代码，我将在相应的章节中介绍

 public class YAOMySQLiteHelper extends SQLiteOpenHelper {
public static String db_path;

private String dbName;
private String dbNameFK;

private String dbImages;
   //private Context context;
 private final Context context;

private SQLiteDatabase myDataBase;

private static final String DATABASE_NAMEFK = "YAOMasterDB.jet";
private static final String DATABASE_NAME = "YAOMasterDB.db";

 public YAOMySQLiteHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

        this.dbNameFK = DATABASE_NAMEFK;
        this.dbName = DATABASE_NAME;

       // this.dbImages=DATABASE_IMAGES;

        this.context = context;
        db_path = "/data/data/" + context.getPackageName() + "/databases/";
      }

 public void importIfNotExist() throws IOException {

        boolean dbExist = checkExist();

        if (dbExist) {
            Log.i("Tag : ImportIfNotExist", "DB Exist : " + dbExist);
            // do nothing - database already exist
        } else {
            Log.i("Tag : ImportIfNotExist", "DB Not Exist : " + dbExist);
            // 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();

                //Deleteing a file (Database)
               // DeleteDBjet();


            } catch (IOException e) {
                        throw new Error("Error copying database");

            }
        }

    }

 /*
  * Create a copy of the database from Asset folder to the android emulator
  */
    private void copyDatabase() throws IOException {

         Log.i("Tag : copyDatabase - Ininitail database", "Getting ready to Coping Database    From the database stored in Asset folder" );

        //Open your local db as the input stream
        InputStream is = context.getAssets().open(dbNameFK);

   String RenameDB2OriginalName = "YAOMasterDB.db";
        String outFileName = db_path + RenameDB2OriginalName;   

    //Open the empty db as the output stream
        OutputStream os = new FileOutputStream(outFileName);

        //transfer bytes from the inputfile to the outputfile
       byte[] buffer = new byte[10000];  


    Log.i("Tag : copyDatabase - buffer Database", "Coping Database From the database stored in Asset folder" );
        int length;
        while ((length = is.read(buffer)) > 0) {
            os.write(buffer, 0, length);
        }



        os.flush();
        os.close();
        is.close();



        this.close();

    }    



            public boolean checkExist() {

        SQLiteDatabase checkDB = null;
                try {
            String myPath = db_path + dbName;

                File dbFile = new File( db_path + dbName);
                return dbFile.exists();



        } 
        catch (SQLiteException e) {
                        e.printStackTrace();



            if (checkDB != null) {

            checkDB.close();


        }
        return checkDB != null ? true : false;
    }



    public void openDataBase() throws SQLException{
            //Open the database
        String myPath = db_path + dbName;
            myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
        }



        @Override
        public synchronized void close() {

        if(myDataBase != null)
        myDataBase.close();
        super.close();

        }

        public void DeleteDBjet(){
            String myPath = db_path + dbName;

            File file = new File(myPath);
            boolean deleted = file.delete();
        }

---

在您的

SplashActivity

（警告来自哪里）

myHelper.close（）

永远不会被调用。

如果您打开数据库，或者如果您正在全局处理它，则需要关闭数据库，这样您就不必一次又一次地打开它。但当不再在活动中使用时，关闭数据库将是一个更好的选择

改变方法

private void startApp() {
    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
    startActivity(intent);
}

对此

private void startApp() {
    myhelper.close();
    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
    startActivity(intent);
}

---

谢谢，我回去照你说的做了，并把它放在相应的myhelper.close（）中，那个错误就不再出现了。

private void startApp() {
    myhelper.close();
    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
    startActivity(intent);
}