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我想存儲在本地主機數據庫中這款車的值，但是這家飯店停止工作，請幫助空指針異常而使用的EditText
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.ActionBar;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
public class UserOptions extends OnscreenActivity {
protected Button subButton;
EditText vNumber;
InputStream is=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar actionbar = getActionBar();
actionbar.hide();
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
vNumber = (EditText)findViewById(R.id.editText1);
setContentView(R.layout.activity_user_options);
Spinner Schoolspin = (Spinner) findViewById(R.id.spinner1);
// Create an ArrayAdapter using the string array and a default spinner
// layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.school_names,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
Schoolspin.setAdapter(adapter);
Spinner stateSpin = (Spinner) findViewById(R.id.spinner2);
// Create an ArrayAdapter using the string array and a default spinner
// layout
ArrayAdapter<CharSequence> adapterstate = ArrayAdapter
.createFromResource(this, R.array.state,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapterstate
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
stateSpin.setAdapter(adapterstate);
Spinner citySpin = (Spinner) findViewById(R.id.spinner3);
// Create an ArrayAdapter using the string array and a default spinner
// layout
ArrayAdapter<CharSequence> cityadapter = ArrayAdapter
.createFromResource(this, R.array.City,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
cityadapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
citySpin.setAdapter(cityadapter);
subButton = (Button) findViewById(R.id.button1);
subButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String van = ""+vNumber.getText().toString();
List<NameValuePair> nameValue = new ArrayList<NameValuePair>(1);
nameValue.add(new BasicNameValuePair("VAN", van));
try {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://10.0.2.2/tutorial.php");
httpPost.setEntity(new UrlEncodedFormEntity(nameValue));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity entity = httpResponse.getEntity();
is=entity.getContent();
String msg = "Data Entered Succesfully";
Toast.makeText(getApplicationContext(), msg,
Toast.LENGTH_LONG).show();
} catch (ClientProtocolException e) {
Log.e("ClientProtocol", "Log_Tag");
e.printStackTrace();
} catch (IOException e) {
Log.e("Log_Tag", "IOException");
e.printStackTrace();
}
Intent intent = new Intent(UserOptions.this,
OnscreenActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.user_options, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Useroptions.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.testmap12.UserOptions" >
<Spinner
android:id="@+id/spinner2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/spinner1"
android:layout_centerHorizontal="true" />
<Spinner
android:id="@+id/spinner3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/spinner2"
android:layout_centerHorizontal="true" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/spinner3"
android:layout_centerHorizontal="true"
android:layout_marginTop="24dp"
android:text="@string/submitButton" />
<EditText
android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/spinner1"
android:layout_marginTop="20dp"
android:hint="@string/hintSchool" >
<requestFocus />
</EditText>
<Spinner
android:id="@+id/spinner1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner2"
android:layout_below="@+id/editText1"
android:layout_marginTop="22dp" />
</RelativeLayout>
logcat的
07-21 13:54:52.665: E/AndroidRuntime(2965): FATAL EXCEPTION: main
07-21 13:54:52.665: E/AndroidRuntime(2965): Process: com.example.testmap12, PID: 2965
07-21 13:54:52.665: E/AndroidRuntime(2965): java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
07-21 13:54:52.665: E/AndroidRuntime(2965): at com.example.testmap12.UserOptions$1.onClick(UserOptions.java:90)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.view.View.performClick(View.java:4756)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.view.View$PerformClick.run(View.java:19749)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.os.Handler.handleCallback(Handler.java:739)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.os.Handler.dispatchMessage(Handler.java:95)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.os.Looper.loop(Looper.java:135)
07-21 13:54:52.665: E/AndroidRuntime(2965): at android.app.ActivityThread.main(ActivityThread.java:5221)
07-21 13:54:52.665: E/AndroidRuntime(2965): at java.lang.reflect.Method.invoke(Native Method)
07-21 13:54:52.665: E/AndroidRuntime(2965): at java.lang.reflect.Method.invoke(Method.java:372)
07-21 13:54:52.665: E/AndroidRuntime(2965): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
07-21 13:54:52.665: E/AndroidRuntime(2965): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
u能請編輯上面的代碼，並告訴我在哪裏，我錯了 –
無法在數據庫 –