警告:不要硬编码"/ data /"; 请改用Context.getFilesDir().getPath()

Question

我开发了一个应用程序,我将数据库从assets文件夹复制到我的硬编码路径.所以日食给了我警告:

Do not hardcode "/data/"; use Context.getFilesDir().getPath() instead

我在谷歌搜索并找到答案使用:

Context.getFilesDir().getPath();

并且硬编码不适用于每个设备,有些可能会出错或无法正常工作.但通过实施上述我得到错误.

我的代码如下:

private final Context myContext;

在这里得到警告

private static String DB_PATH =  "/data/data/com.example.abc/databases/";


private static final int DATABASE_VERSION = 1; 
private static final String DATABASE_NAME = "exampledb.sqlite";
static SQLiteDatabase sqliteDataBase;

public DataBaseHelperClass(Context context) {       
    super(context, DATABASE_NAME, null ,DATABASE_VERSION);
    this.myContext = context;
}

public void createDataBase() throws IOException{
    boolean databaseExist = checkDataBase();

    if(databaseExist){
        this.getWritableDatabase();
    }else{
        this.getReadableDatabase();         
        copyDataBase(); 
    }
} 


public boolean checkDataBase(){
    File databaseFile = new File(DB_PATH + DATABASE_NAME);
    return databaseFile.exists();        
}

private void copyDataBase() throws IOException{ 
    InputStream myInput = myContext.getAssets().open(DATABASE_NAME); 
    String outFileName = DB_PATH + DATABASE_NAME; 
    OutputStream myOutput = new FileOutputStream(outFileName); 
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer))>0){
        myOutput.write(buffer, 0, length);
    }

    myOutput.flush();
    myOutput.close();
    myInput.close(); 
}


public void openDataBase() throws SQLException{      
    String myPath = DB_PATH + DATABASE_NAME;
    sqliteDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);  
}

@Override
public synchronized void close() { 
    if(sqliteDataBase != null)
        sqliteDataBase.close(); 
    super.close(); 
}

public Cursor myFunction(){

}

@Override
public void onCreate(SQLiteDatabase db) {}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {} 

请告诉我如何解决警告的方法.

Answer 1

日食给你的提示不够好.

您可以获取数据库路径context.getDatabasePath(); 您应该将所需的名称传递给文件(无论是否存在),在您的情况下exampledb.sqlite

所以你的代码将是:

File outFile =myContext.getDatabasePath(DATABASE_NAME);
String outFileName =outFile.getPath() ;

当然,myContext必须是当前的背景.例如,这是调用它的运行活动或服务.

Answer 2

做如下:

public DataBaseHelperClass(Context context) {       
    super(context, DATABASE_NAME, null ,DATABASE_VERSION);
    this.myContext = context;
    //The Android's default system path of your application database.
    DB_PATH = myContext.getDatabasePath(DATABASE_NAME).getPath();
}

你不会得到错误或警告.