Question

我使用以下代码在android中创建数据库：

public class PackageDBHelper extends SQLiteOpenHelper{

//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.myapp/databases/";

private static String DB_NAME = "my_db.db";

public SQLiteDatabase db; 

private final Context myContext;

public PackageDBHelper(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
}   
public void createDataBase() throws IOException{

    boolean dbExist = checkDataBase();

    if(dbExist){
        //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();  //error occurs here

        try {

            copyDataBase();

        } catch (IOException e) {

            throw new Error("Error copying database");

        }
    }

}

堆栈跟踪：

android.database.sqlite.SQLiteDiskIOException: disk I/O error
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1668)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1684)
at android.app.ActivityThread.access$1500(ActivityThread.java:124)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:948)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3717)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteDiskIOException: disk I/O error
at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1849)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:197)
at com.myapp.util.PackageDBHelper.createDataBase(PackageDBHelper.java:51)

此应用已在市场上，我收到了一些错误报告。我无法在任何设备上复制它，错误相对较少。我意识到应该从设备中检索DB_PATH，但这不应该影响对getReadableDatabase（）的调用。

有什么想法吗？

Answer 1

我在HTC Desire HD和Android 2.1上的Galaxy S上遇到了同样的问题

使用以下DB_PATH似乎可以解决问题：

Environment.getDataDirectory() + “/data/YOUR_PACKAGE/databases/”;

此处提供更多详情https://stackoverflow.com/a/4828540

Answer 2

尝试更改

public PackageDBHelper(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
}

到

public PackageDBHelper(Context context) {

    super(context, "my_db", null, 1);//without the extension .db
    this.myContext = context;
}

SQLiteDiskIOException：创建数据库时出现磁盘I / O错误

2 个答案: