SQLiteDatabase'沒有實現接口'

Question

使用SQLiteDatabase作為Closeable時出現此錯誤

我有一個示例項目來重新創建它：

https://github.com/blundell/SQLDatabaseError

使用擴展SQLiteOpenHelper的類：

public class DatabaseHelper extends SQLiteOpenHelper {

....

public void openAndCloseDatabase() {
    SQLiteDatabase database = getWritableDatabase();

    close(database);
}

private void close(Closeable database) {
    try {
        if (database != null) {
            database.close();
        }
    } catch (Exception e) {
        Log.e("Error", "Oh no!", e);
    }
}

}

堆棧跟蹤：

12-14 12:23:43.719: E/AndroidRuntime(5179): FATAL EXCEPTION: main
12-14 12:23:43.719: E/AndroidRuntime(5179): java.lang.IncompatibleClassChangeError: interface not implemented
12-14 12:23:43.719: E/AndroidRuntime(5179):   at com.blundell.sqldatabasecursorerror.DatabaseHelper.close(DatabaseHelper.java:35)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at com.blundell.sqldatabasecursorerror.DatabaseHelper.openAndCloseDatabase(DatabaseHelper.java:29)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at com.blundell.sqldatabasecursorerror.MainActivity.onCreate(MainActivity.java:13)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.ActivityThread.access$1500(ActivityThread.java:121)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.os.Looper.loop(Looper.java:130)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at android.app.ActivityThread.main(ActivityThread.java:3701)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at java.lang.reflect.Method.invokeNative(Native Method)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at java.lang.reflect.Method.invoke(Method.java:507)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
12-14 12:23:43.719: E/AndroidRuntime(5179):     at dalvik.system.NativeStart.main(Native Method)

API：

http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html

http://developer.android.com/reference/android/database/sqlite/SQLiteClosable.html

http://developer.android.com/reference/java/io/Closeable.html

這應該工作不應該嗎？

 public final class SQLiteDatabase extends SQLiteClosable
 >>
 public abstract class SQLiteClosable extends Object implements Closeable
 >>
 public interface Closeable

不起作用：

• Xperia Play Android 2.3.4
• 摩托羅拉Xoom Android 4.0.4

工作：

• 三星Galaxy Nexus Android 4.2

Answer 1

好的， 在4.1的更改說明（API級別16）中發現了問題：

android.database.sqlite.SQLiteClosable僅從API級別16實現java.io.Closeable 。在此之前，它們是無關的（即使兩個接口從一開始就存在）。

因此，如果您希望代碼向后兼容，則應直接使用SQLiteClosable。

也可能值得為您想要支持的最低版本安裝SDK並嘗試使用它構建，然后編譯器會檢測到這一點。