android - 应用程序没有关闭游标或数据库对象android

Question

我正在尝试通过 AsyncTask 中的联系人簿中的号码查找联系人姓名。有时我会收到以下错误，我认为这会导致应用程序崩溃。请提供任何帮助。

日志

08-05 09:00:49.627 24988-27371/com.fake.fake E/CursorLeakDetecter: PossibleCursorLeak:content://com.android.contacts/phone_lookup/%2B923310433708,QueryCounter:5
android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
    at android.content.ContentResolver.query(ContentResolver.java:323)
    at com.fake.fake.GV.getContactName(GV.java:177)
    at com.fake.fake.MySQLiteHelper.GetNumbers(MySQLiteHelper.java:361)
    at com.fake.fake.MainActivity$taskLoadContacts.doInBackground(MainActivity.java:930)
    at com.fake.fake.MainActivity$taskLoadContacts.doInBackground(MainActivity.java:921)
    at android.os.AsyncTask$2.call(AsyncTask.java:264)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
    at java.lang.Thread.run(Thread.java:856)

从数据库中检索联系电话。

 public ArrayList<MyMessageDetails> GetNumbers(String query) {
        ArrayList<MyMessageDetails> numbers = new ArrayList<MyMessageDetails>();
        Cursor cursor = db.rawQuery(query, null);
        if (cursor != null && cursor.moveToFirst()) {
            do {
                MyMessageDetails item = new MyMessageDetails();
                item.setNumber(cursor.getString(0));
                String name = GV.getContactName(item.getNumber());    
                if (name == null) {
                    name = item.getNumber();
                }
                item.setName(name);
                item.setTime(cursor.getString(3));
                numbers.add(item);
            } while (cursor.moveToNext());

        }
        return numbers;
    }

正在检索联系人姓名。

 public static String getContactName(String phoneNumber) {
        if (phoneNumber != null) {
            ContentResolver cr = ApplicationContextProvider.getContext().getContentResolver();
            Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber));
            Cursor cursor = cr.query(uri, new String[]{ContactsContract.PhoneLookup.DISPLAY_NAME}, null, null, null);
            if (cursor == null) {
                return "";
            }
            String contactName = null;
            if (cursor.moveToFirst()) {
                contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME));
            }

            if (cursor != null && !cursor.isClosed()) {
                cursor.close();
            }
            return contactName;
        }

        return phoneNumber;
    }

Answer 1

从中读取数据后使用Cursor#close()。示例:

Cursor cursor = ...
try {
    // fetch whatever you need here
} finally {
    cursor.close();
}