我正在使用以下代码删除图片。它第一次工作，但是当我尝试捕获图像并将其删除时
我得到了StaleDataException：
08-07 14:57:24.156: E/AndroidRuntime(789): java.lang.RuntimeException: Unable to
resume activity {com.example.cap_im/com.example.cap_im.MainActivity}:
android.database.StaleDataException: Attempted to access a cursor after it has been closed.
public void deleteImageFromGallery(String captureimageid) {
Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
getContentResolver().delete(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
BaseColumns._ID + "=?", new String[] { captureimageid });
String[] projection = { MediaStore.Images.ImageColumns.SIZE,
MediaStore.Images.ImageColumns.DISPLAY_NAME,
MediaStore.Images.ImageColumns.DATA, BaseColumns._ID, };
Log.i("InfoLog", "on activityresult Uri u " + u.toString());
try {
if (u != null) {
cursor = managedQuery(u, projection, null, null, null);
}
if ((cursor != null) && (cursor.moveToLast())) {
int i = getContentResolver().delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
BaseColumns._ID + "=" + cursor.getString(3), null);
Log.v(TAG, "Number of column deleted : " + i);
}
} finally {
if (cursor != null) {
cursor.close();
}
}
}
答案 0 :(得分：36)
功能，managedQuery()已弃用。
请使用getContentResolver().query()。
参数相同。
答案 1 :(得分：7)
在finally块中，关闭光标，但不要将其设置为null。因此，下次调用方法时，cursor.getString(3)会失败，因为游标已关闭。
解决方法：在cursor区块中将null设置为finally。
正确解决方案：不要为cursor使用实例变量，而是在方法中使用局部变量。
答案 2 :(得分：2)
我有类似的问题。在我的情况下，代码很好，但我使用了已弃用的方法＆＃39; managedQuery＆＃39;而不是汤姆林建议的那个
public String getPath(Uri uri) {
if (uri == null) {
return null;
}
String result = null;
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
// deprecated:
// Cursor cursor = managedQuery(uri, projection, null, null, null);
if (cursor != null) {
int columnIndex = 0;
try {
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
result = cursor.getString(columnIndex);
} catch (IllegalArgumentException e) {
Log.e("While getting path for file", e);
} finally {
try {
if (!cursor.isClosed()) {
cursor.close();
}
cursor = null;
} catch (Exception e) {
Log.e("While closing cursor", e);
}
}
}
return result;
}
如果我使用弃用的方法，如果省略finally，它仍然有效。在doc中也明确声明在使用此方法时不应关闭光标
答案 3 :(得分：1)
绝对使用此代码，使用getContentResolver（）。query（）而不是managedQuery（）。因为不推荐使用managedQuery（）。它为我工作完美。谢谢你
答案 4 :(得分：0)
也不要使用managedQuery()它已被弃用。
删除它：
protected SQLiteDatabase database;
并将其设为本地
基本上2个方法同时执行，一个名为database.close()的方法和第二个方法仍在访问数据，因此Exception
使用它：
public class db {
DataBaseHelper dbHelper;
Context mContext;
public db(Context context) {
this.mContext = context;
}
public db open() throws SQLException {
dbHelper = new DataBaseHelper(mContext);
return this;
}
public void close() {
dbHelper.close();
}
public void insertdb( int id,String ph_num, String call_type, String calldate, String call_duration, String upload_status) {
SQLiteDatabase database = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(DataBaseHelper.id,id);
values.put(DataBaseHelper.phone_number, ph_num);
values.put(DataBaseHelper.call_type, call_type);
values.put(DataBaseHelper.call_date, calldate);
values.put(DataBaseHelper.call_duration, call_duration);
values.put(DataBaseHelper.upload_status, upload_status);
database.insert(DataBaseHelper.table_name, null, values);
database.close();
// Log.d("Database helper", "values inserted");
}
public ArrayList<HashMap<String, String>> getAllUsers() {
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM call_logtable";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("id", cursor.getString(0));
map.put("phone_number", cursor.getString(1));
map.put("call_type", cursor.getString(2));
map.put("call_date", cursor.getString(3));
map.put("call_duration", cursor.getString(4));
wordList.add(map);
} while (cursor.moveToNext());
}
cursor.close(); // just added
database.close();
return wordList;
}
/**
* Compose JSON out of SQLite records
* @return
*/
public String composeJSONfromSQLite(){
ArrayList<HashMap<String, String>> wordList;
wordList = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM call_logtable where upload_status = '"+"no"+"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
HashMap<String, String> map = new HashMap<String, String>();
map.put("id", cursor.getString(0));
map.put("phone_number", cursor.getString(1));
map.put("call_type", cursor.getString(2));
map.put("call_date", cursor.getString(3));
map.put("call_duration", cursor.getString(4));
wordList.add(map);
} while (cursor.moveToNext());
}
cursor.close(); // just added
database.close();
Gson gson = new GsonBuilder().create();
//Use GSON to serialize Array List to JSON
return gson.toJson(wordList);
}
public int dbSyncCount(){
int count = 0;
String selectQuery = "SELECT * FROM call_logtable where upload_status = '"+"no"+"'";
SQLiteDatabase database = dbHelper.getWritableDatabase();
Cursor cursor = database.rawQuery(selectQuery, null);
count = cursor.getCount();
cursor.close(); // just added
database.close();
return count;
}
public void updateSyncStatus(String id, String status){
SQLiteDatabase database = dbHelper.getWritableDatabase();
String updateQuery = "Update call_logtable set upload_status = '"+ status +"' where id="+"'"+ id +"'";
Log.d("query", updateQuery);
database.execSQL(updateQuery);
database.close();
}
public Cursor getinformation()
{
SQLiteDatabase database = dbHelper.getReadableDatabase();
String[] columns={DataBaseHelper.phone_number,DataBaseHelper.call_type,DataBaseHelper.call_date,DataBaseHelper.call_duration,DataBaseHelper.upload_status};
return database.query(DataBaseHelper.table_name,columns,null,null,null,null,null);
}
public void delete()
{
SQLiteDatabase database = dbHelper.getWritableDatabase();
// String[] columns={DataBaseHelper.phone_number,DataBaseHelper.call_type,DataBaseHelper.call_date,DataBaseHelper.call_duration};
database.delete(DataBaseHelper.table_name, null, null);
}
StringBuffer readSpecificfrom_db(String type)
{
String ph_number=null;
String call_type=null;
String call_date=null;
String call_duration=null;
String upload_status=null;
StringBuffer sb = new StringBuffer();
//sb.append("Call Log :");
Cursor cursor_object=getinformation();
cursor_object.moveToFirst();
do {
if((cursor_object.getString(1)).equals(type)) {
ph_number = cursor_object.getString(0);
call_type = cursor_object.getString(1);
call_date = cursor_object.getString(2);
call_duration = cursor_object.getString(3);
if(type=="Missed") {
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
// + " \nCall duration in sec :--- " + call_duration
);
sb.append("\n----------------------------------");
}
else
{
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
+ " \nCall duration in sec :--- " + call_duration);
sb.append("\n----------------------------------");
}
}
}while(cursor_object.moveToNext());
cursor_object.close(); // just added
return sb;
}
StringBuffer readfrom_db()
{
String ph_number=null;
String call_type=null;
String call_date=null;
String call_duration=null;
String upload_status;
// int id=0;
StringBuffer sb = new StringBuffer();
// sb.append("Call Log :");
Cursor cursor_object=getinformation();
cursor_object.moveToFirst();
do {
ph_number=cursor_object.getString(0);
call_type=cursor_object.getString(1);
call_date=cursor_object.getString(2);
call_duration=cursor_object.getString(3);
sb.append("\nPhone Number:--- " + ph_number +
" \nCall Type:--- " + call_type +
" \nCall Date:--- " + call_date
+ " \nCall duration in sec :--- " + call_duration);
sb.append("\n----------------------------------");
} while(cursor_object.moveToNext());
cursor_object.close(); // just added
return sb;
}
}