我正在为sqlite数据库中的插入记录实现app。但是当我运行应用程序时，我在以下行得到了空指针异常：
String userPin=editTextPin.getText().toString();
String userConfirmPin=editTextConfirmPin.getText().toString();
我试过但是没有插入记录，我的应用程序崩溃了。这是我的代码和日志猫堆栈跟踪。
这是我的活动代码。
public class Registration_Activity1 extends Activity
{
TextView eText_TotalRecord;
EditText editTextUserName,editTextEmailId , editTextPin,editTextConfirmPin;
Button btnCreateAccount;
Button btnViewDetails;
DataBase_Adapter dbHandller;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.registration_activity1);
// get Instance of Database Adapter
dbHandller=new DataBase_Adapter(this);
dbHandller=dbHandller.open();
editTextUserName = (EditText) findViewById(R.id.editText_regName);
editTextEmailId = (EditText) findViewById(R.id.editText_regEmail);
editTextPin = (EditText) findViewById(R.id.editText_regApp_Pin);
editTextConfirmPin = (EditText) findViewById(R.id.editText_regConfirm_App_Pin);
btnCreateAccount=(Button)findViewById(R.id.reg_btnSubmit);
btnCreateAccount.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String userName=editTextUserName.getText().toString();
String userEmail=editTextEmailId.getText().toString();
String userPin=editTextPin.getText().toString();
String userConfirmPin=editTextConfirmPin.getText().toString();
// check if any of the fields are vaccant
if(userName.equals("")||userEmail.equals("")||userPin.equals("")||userConfirmPin.equals(""))
{
Toast.makeText(getApplicationContext(), "Field Vaccant", Toast.LENGTH_SHORT).show();
return;
}
// check if both password matches
if(!userPin.equals(userConfirmPin))
{
Toast.makeText(getApplicationContext(), "Pin does not match", Toast.LENGTH_SHORT).show();
return;
}
else
{
// Save the Data in Database
dbHandller.insertEntry(userName, userEmail, userPin);
Toast.makeText(getApplicationContext(), "Account Successfully Created ", Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
dbHandller.close();
}
}
11-26 18:21:30.635: E/AndroidRuntime(337): FATAL EXCEPTION: main
11-26 18:21:30.635: E/AndroidRuntime(337): java.lang.NullPointerException
11-26 18:21:30.635: E/AndroidRuntime(337): at com.lead_management_project.Registration_Activity1$1.onClick(Registration_Activity1.java:50)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.view.View.performClick(View.java:2485)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.view.View$PerformClick.run(View.java:9080)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.os.Handler.handleCallback(Handler.java:587)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.os.Handler.dispatchMessage(Handler.java:92)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.os.Looper.loop(Looper.java:123)
11-26 18:21:30.635: E/AndroidRuntime(337): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-26 18:21:30.635: E/AndroidRuntime(337): at java.lang.reflect.Method.invokeNative(Native Method)
11-26 18:21:30.635: E/AndroidRuntime(337): at java.lang.reflect.Method.invoke(Method.java:507)
11-26 18:21:30.635: E/AndroidRuntime(337): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-26 18:21:30.635: E/AndroidRuntime(337): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-26 18:21:30.635: E/AndroidRuntime(337): at dalvik.system.NativeStart.main(Native Method)
这是我的注册xml
的xml文件<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0"
android:padding="5dp" >
<!-- Table Row for Name -->
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:padding="5dp" >
<EditText
android:id="@+id/editText_regName"
android:layout_width="290dp"
android:layout_height="40dp"
android:ems="10"
android:hint="@string/regi_name"
android:nextFocusDown="@+id/editText_regEmail"
android:textSize="12sp" />
</TableRow>
<!-- Table Row for Email -->
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp" >
<EditText
android:id="@+id/editText_regEmail"
android:layout_width="290dp"
android:layout_height="40dp"
android:ems="10"
android:hint="@string/regi_email"
android:inputType="textEmailAddress"
android:nextFocusDown="@+id/editText_regApp_Pin"
android:textSize="12sp" />
</TableRow>
<!-- Table Row for Pn -->
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp" >
<EditText
android:id="@+id/editText_regAppPin"
android:layout_width="290dp"
android:layout_height="40dp"
android:ems="10"
android:hint="@string/regi_pin"
android:inputType="number"
android:maxLength="4"
android:nextFocusDown="@+id/editText_regConfirm_App_Pin"
android:password="true"
android:textSize="12sp" >
<requestFocus />
</EditText>
</TableRow>
<!-- Table Row for Confirm Pin -->
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp" >
<EditText
android:id="@+id/editText_regConfirm_App_Pin"
android:layout_width="290dp"
android:layout_height="40dp"
android:ems="10"
android:hint="@string/regi_confirm_pin"
android:inputType="number"
android:maxLength="4"
android:nextFocusDown="@+id/reg_btnSubmit"
android:password="true"
android:textSize="12sp" />
</TableRow>
<!-- Table Row for Button -->
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp" >
<Button
android:id="@+id/reg_btnSubmit"
style="?android:attr/action"
android:layout_width="0dp"
android:layout_height="30dp"
android:layout_weight="1.25"
android:text="@string/reg_btn_submit"
android:textSize="12sp" />
</TableRow>
</TableLayout>