android - 设备崩溃

Question

我有一个应用程序，我使用数据库在 ListView 中插入值。当我在合并后在模拟器上运行应用程序时，它运行良好，但在开始插入值时在设备上崩溃，LogCat 向我显示:关闭光标，但我已经关闭了所有开始打开的类(class)。
这是按钮 Action

plus.setOnClickListener(new View.OnClickListener() {


    public void onClick(View v) 
    {

        tx = txt.getText().toString();
        postive.add(tx);
        if(tx.length() >0)
        {
            myDB.execSQL("INSERT INTO UP (ID,UPNAME) VALUES ('"+idnum+"','"+tx+"')");

            txt.setText("");            
            function();
             results.clear();
            Intent i=new  Intent(Positive.this,NewgridActivity.class);
            bundle.putInt("tabid", 1);
            bundle.putInt("id", idnum);
            i.putExtras(bundle);
            startActivity(i);
            finish();
        }
        else
            DisplayToast("TextField Empty !!!!");

    }
});

请提供任何帮助。

logcat 中的错误

12-21 13:11:02.582: E/Database(4909): close() was never explicitly called on database '/data/data/pa.gd/databases/DECISION_GRID' 
12-21 13:11:02.582: E/Database(4909): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
12-21 13:11:02.582: E/Database(4909):   at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1810)
12-21 13:11:02.582: E/Database(4909):   at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:817)
12-21 13:11:02.582: E/Database(4909):   at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:851)
12-21 13:11:02.582: E/Database(4909):   at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:844)
12-21 13:11:02.582: E/Database(4909):   at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:540)
12-21 13:11:02.582: E/Database(4909):   at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
12-21 13:11:02.582: E/Database(4909):   at pa.gd.PAIDGRIDActivity.onCreate(PAIDGRIDActivity.java:66)
12-21 13:11:02.582: E/Database(4909):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-21 13:11:02.582: E/Database(4909):   at dalvik.system.NativeStart.main(Native Method)

关闭数据库后记录错误

当我尝试添加一个值时，我已经关闭了数据库，它会因此日志错误而崩溃

12-21 15:45:58.043: E/AndroidRuntime(401): FATAL EXCEPTION: main
12-21 15:45:58.043: E/AndroidRuntime(401): java.lang.IllegalStateException: database not open
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1723)
12-21 15:45:58.043: E/AndroidRuntime(401):  at dc.grd.Positive$1.onClick(Positive.java:77)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.view.View.performClick(View.java:2408)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.view.View$PerformClick.run(View.java:8816)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.os.Handler.handleCallback(Handler.java:587)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.os.Handler.dispatchMessage(Handler.java:92)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.os.Looper.loop(Looper.java:123)
12-21 15:45:58.043: E/AndroidRuntime(401):  at android.app.ActivityThread.main(ActivityThread.java:4627)
12-21 15:45:58.043: E/AndroidRuntime(401):  at java.lang.reflect.Method.invokeNative(Native Method)
12-21 15:45:58.043: E/AndroidRuntime(401):  at java.lang.reflect.Method.invoke(Method.java:521)
12-21 15:45:58.043: E/AndroidRuntime(401):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-21 15:45:58.043: E/AndroidRuntime(401):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-21 15:45:58.043: E/AndroidRuntime(401):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

考虑一下数据库连接的生命周期。我建议在您的应用程序类或 onResume() 中打开数据库。你的 Activity 方法。关闭onPause()中的数据库.

每当您使用数据库时，请确保在使用完数据库后正确关闭所有游标。

顺便说一句:每次你像以前那样写一个问题标题，一只小猫就会死去......