后退按钮不起作用
当我点击这里mihai我从下面得到活动
问题是，当我在最后一个屏幕上点击后退按钮时，我没有回到搜索活动，但我得到了以下错误：
12-29 15:55:47.153: E/AndroidRuntime(408): FATAL EXCEPTION: main
12-29 15:55:47.153: E/AndroidRuntime(408): java.lang.RuntimeException: Unable to resume activity {org.example.dbcontactconsole/org.example.dbcontactconsole.Search}: java.lang.IllegalStateException: database /data/data/org.example.dbcontactconsole/databases/contactTest1.db already closed
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3128)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3143)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2059)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.os.Handler.dispatchMessage(Handler.java:99)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.os.Looper.loop(Looper.java:123)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-29 15:55:47.153: E/AndroidRuntime(408): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 15:55:47.153: E/AndroidRuntime(408): at java.lang.reflect.Method.invoke(Method.java:521)
12-29 15:55:47.153: E/AndroidRuntime(408): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-29 15:55:47.153: E/AndroidRuntime(408): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-29 15:55:47.153: E/AndroidRuntime(408): at dalvik.system.NativeStart.main(Native Method)
12-29 15:55:47.153: E/AndroidRuntime(408): Caused by: java.lang.IllegalStateException: database /data/data/org.example.dbcontactconsole/databases/contactTest1.db already closed
12-29 15:55:47.153: E/AndroidRuntime(408): at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:237)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.database.sqlite.SQLiteQuery.requery(SQLiteQuery.java:145)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:531)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.Activity.performRestart(Activity.java:3795)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.Activity.performResume(Activity.java:3816)
12-29 15:55:47.153: E/AndroidRuntime(408): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118)
我的search.java是：
`
public class Search extends ListActivity {
private static int[] TO = {R.id.name };
private static String[] FROM = {DbConstants.NAME, DbConstants.PHONE, DbConstants.EMAIL,_ID};
private Button sButton;
private ListView lv1;
private static SQLiteDatabase db;
private DbCreate contacts;
private Cursor cursor;
private EditText searchText;
protected SimpleCursorAdapter adapter;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
searchText=(EditText)findViewById(R.id.searchtext);
sButton=(Button)findViewById(R.id.searchButton);
sButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
showDatabaseContent();
lv1 = getListView();
lv1.setTextFilterEnabled(true);
}
});
}
private Cursor getContacts() {
db = contacts.getReadableDatabase();
cursor = db.rawQuery("SELECT _id,name, phone, email FROM contactTest1 WHERE name LIKE ?",
new String[]{searchText.getText().toString()+"%"});
startManagingCursor(cursor);
return cursor;
}
public void showDatabaseContent(){
contacts = new DbCreate(this);
try {
cursor = getContacts();
showContacts(cursor);
} finally {
contacts.close();
db.close();
}
}
private void showContacts(Cursor cursor) {
//set up data binding
adapter = new SimpleCursorAdapter(this, R.layout.item, cursor, FROM, TO);
setListAdapter(adapter);
}
public void onListItemClick(ListView parent, View v, int position, long id) {
Intent abaintent = new Intent(this,Detalii.class);
Cursor cursor = (Cursor) adapter.getItem(position);
abaintent.putExtra("Contact_ID", cursor.getInt(cursor.getColumnIndex("_id")));
startActivity(abaintent);
}
}
`
这是我的Detalii .java：
public class Detalii extends ListActivity
{
protected TextView contactName;
protected TextView contactPhone;
protected TextView email;
protected int contactId;
protected List<Actiune> actiune;
protected ActiuneAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detalii);
contactId = getIntent().getIntExtra("Contact_ID",0);
SQLiteDatabase db = (new DbCreate(this)).getWritableDatabase();
Cursor cursor = db.rawQuery("SELECT name,phone,email FROM contactTest1 WHERE _id=?",new String[]{""+contactId});
if (cursor.getCount() == 1)
{
cursor.moveToFirst();
actiune= new ArrayList<Actiune>();
String phoneString=cursor.getString(cursor.getColumnIndex("phone"));
if (phoneString!=null)
{
actiune.add(new Actiune("Suna la numar",phoneString,Actiune.ACTION_CALL));
actiune.add(new Actiune("SMS",phoneString,Actiune.ACTION_SMS));
}
String stringemail = cursor.getString(cursor.getColumnIndex("email"));
if (stringemail != null) {
actiune.add(new Actiune("Email", stringemail,Actiune.ACTION_EMAIL));
}
adapter = new ActiuneAdapter();
setListAdapter(adapter);
}
}
public void onListItemClick(ListView parent, View view, int position, long id) {
Actiune action = actiune.get(position);
Intent intent;
switch (action.getType()) {
case Actiune.ACTION_CALL:
Uri callUri = Uri.parse("tel:" + action.getData());
intent = new Intent(Intent.ACTION_CALL, callUri);
startActivity(intent);
break;
case Actiune.ACTION_EMAIL:
intent = new Intent(Intent.ACTION_SEND);
intent.setType("plain/text");
intent.putExtra(Intent.EXTRA_EMAIL, new String[]{action.getData()});
startActivity(intent);
break;
case Actiune.ACTION_SMS:
Uri smsUri = Uri.parse("sms:" + action.getData());
intent = new Intent(Intent.ACTION_VIEW, smsUri);
startActivity(intent);
break;
}
}
class ActiuneAdapter extends ArrayAdapter<Actiune> {
ActiuneAdapter() {
super(Detalii.this, R.layout.actiune_detalii, actiune);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Actiune action = actiune.get(position);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.actiune_detalii, parent, false);
TextView label = (TextView) view.findViewById(R.id.label);
label.setText(action.getLabel());
TextView data = (TextView) view.findViewById(R.id.data);
data.setText(action.getData());
return view;
}
}
}
我该怎么办才能让后退按钮工作？我在模拟器上模拟，因为我没有手机
3 个答案:
答案 0 :(得分：0)
尝试将此代码SQLiteDatabase db = (new DbCreate(this)).getWritableDatabase();添加到OnResume活动的Detalii功能。
答案 1 :(得分：0)
错误表明您已关闭与数据库的连接，并且可能在触发恢复功能时尝试向数据库运行问题。
当您重新打开搜索视图时，通过打开与数据库的新连接来解决此问题。
答案 2 :(得分：0)
这很简单。您假设您的数据库已打开，但事实上，当您恢复以前的活动时，它实际上已关闭。可能是因为您的应用程序无法正确处理恢复/暂停事件，或者可能是因为您的数据库变量被声明为static。请尝试在onDestroy()中关闭它。
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？