Android Studio 代码在 Android P 9.0 上不起作用

Question

请我的 Android 应用程序在任何 Android 应用程序版本中都能正常工作，但在 android 9.0 上不能工作？？在模拟器上从android studio运行代码时没有显示错误，问题是AutoCompleteTextView不起作用，但在其他更高和更低版本上运行良好。我的代码是：

AutoCompleteTextView srch_txt=(AutoCompleteTextView) findViewById(R.id.srch_txt);
        DBConnection db = new DBConnection(this);
        //SQLiteDatabase dbb = db.getWritableDatabase();//connect to MyDB
        SQLiteDatabase dbb = db.getReadableDatabase();//connect to MyDB
        final String [] mydata;
        //Inside the method you've read the cursor, loop through it and add those item to array
        String sql="SELECT * FROM revuesC";
        //execute SQL
        Cursor cr= dbb.rawQuery(sql, null);
        mydata = new String[cr.getCount()];//create array string based on numbers of row
        int i=0;
        while (cr.moveToNext()) {
            mydata[i]= cr.getString(1);
            i++;
        }
        cr.moveToFirst();
        ArrayAdapter<String> adapter = new ArrayAdapter<String>
                (this,android.R.layout.select_dialog_item,mydata);
        //Getting the instance of AutoCompleteTextView
        //AutoCompleteTextView actv =  (AutoCompleteTextView)findViewById(R.id.autoCompleteTextView);
        srch_txt.setThreshold(1);//will start working from first character
        srch_txt.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
        cr.close();

> Blockquote

Answer 1

我通过在我的 DBConnectionHelper 中添加此 @override 方法来解决此问题：

@Override
    public void onOpen(SQLiteDatabase db) {
        super.onOpen(db);
        db.disableWriteAheadLogging();
    }