SQLiteDatabase '不实现接口'

Question

当我将SQLiteDatabase 用作Closeable 时出现此错误

我有一个示例项目来重新创建它：

https://github.com/blundell/SQLDatabaseError

使用扩展 SQLiteOpenHelper 的类：

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);
    }
}

}

堆栈跟踪：

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

这应该可以吧？

 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
• 摩托罗拉 Xoom Android 4.0.4

有效：

• 三星 Galaxy Nexus Android 4.2

Answer 1

好的，找到问题in the Change Notes for 4.1 (API Level 16)：

android.database.sqlite.SQLiteClosable 仅从 API 级别 16 实现 java.io.Closeable。在此之前，它们是不相关的（尽管这两个接口从一开始就存在）。

因此，如果您希望代码向后兼容，则应直接使用 SQLiteClosable。

也可能值得为您想要支持的最低版本安装 SDK 并尝试使用它进行构建，然后编译器会检测到这一点。