我正在使用java开发一个android应用程序。我使用 SQLite 创建了数据库。我正在尝试检查值是否已插入数据库。但是当点击注册按钮时，它应该会显示一条成功的消息。但没有任何反应，我没有收到任何错误。我检查了按钮 ID 并检查了几次代码，但我不明白为什么没有显示“成功”消息。请帮忙
---------------Class that Creates the Database------------------------------
package com.android.disasterAlertApp;
import android.content.*;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.*;
public class DBAdapter {
//Table where registration details will be saved
public static final String KEY_USERNO = "userID";
public static final String KEY_FIRSTNAME = "first_Name";
public static final String KEY_LASTNAME = "last_Name";
public static final String KEY_EMAIL = "email";
public static final String KEY_MOBILENUMBER = "mobile_Number";
public static final String KEY_LOCATIONUM = "locationID";
private static final String DATABASE_NAME = "DisasterAlertDB";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_TABLE = "User";
private DbHelper ourhelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
public static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE" + DATABASE_TABLE + " ("+ KEY_USERNO + "INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_FIRSTNAME + "TEXT NOT NULL, " + KEY_LASTNAME + "TEXT NOT NULL, " + KEY_EMAIL + "TEXT NOT NULL, " + KEY_MOBILENUMBER + "TEXT NOT NULL, " + KEY_LOCATIONUM + "TEXT NOT NULL);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + DATABASE_TABLE);
}
public DBAdapter(Context c){
ourContext = c;
}
public DBAdapter open() throws SQLException{
ourhelper = new DbHelper(ourContext);
ourDatabase = ourhelper.getWritableDatabase();
return this;
}
public void close(){
ourhelper.close();
}
public long createEntry(String fname, String lname, String email,
String number, String loc) {
ContentValues cv = new ContentValues();
cv.put(KEY_FIRSTNAME, fname);
cv.put(KEY_LASTNAME, lname);
cv.put(KEY_EMAIL, email);
cv.put(KEY_MOBILENUMBER, number);
cv.put(KEY_LOCATIONUM, loc);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
}
------Class that gets the values from text fields and passes them to create a record-------
package com.android.disasterAlertApp;
import android.app.Activity;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Registration extends Activity implements OnClickListener{
Button sqlRegister;
EditText sqlFirstName,sqlLastName,sqlEmail,sqlMobileNumber,sqlCurrentLocation,sqlUsername,sqlPassword;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.registration);
sqlFirstName = (EditText) findViewById(R.id.etFname);
sqlLastName = (EditText) findViewById(R.id.etLname);
sqlEmail = (EditText) findViewById(R.id.etEmail);
sqlMobileNumber = (EditText) findViewById(R.id.etPhone);
sqlCurrentLocation = (EditText) findViewById(R.id.etCurrentLoc);
sqlUsername = (EditText) findViewById(R.id.etUsername);
sqlPassword = (EditText) findViewById(R.id.etPwd);
sqlRegister = (Button) findViewById(R.id.bRegister);
sqlRegister.setOnClickListener(this);
}
public void onClick(View arg0) {
switch (arg0.getId()){
case R.id.bRegister:
boolean worked = true;
try{
String fname = sqlFirstName.getText().toString();
String Lname = sqlLastName.getText().toString();
String email = sqlEmail.getText().toString();
String number = sqlMobileNumber.getText().toString();
String loc = sqlCurrentLocation.getText().toString();
String uname = sqlUsername.getText().toString();
String pwd = sqlPassword.getText().toString();
DBAdapter entry = new DBAdapter(Registration.this);
entry.open();
entry.createEntry(fname,Lname,email,number,loc);
entry.close();
}catch(Exception e){
worked=false;
}finally{
if(worked){ //Gets fired when values are inserted
Dialog d = new Dialog(this);
d.setTitle("works");
TextView tv = new TextView(this);
tv.setText("Success");
d.setContentView(tv);
d.show();
}
}
break;
}
}
}
------------------Modified OnClick Method-------------------------------
public void onClick(View arg0) {
Toast.makeText(this, "fire", Toast.LENGTH_LONG).show();
switch (arg0.getId()){
case R.id.bRegister:
boolean worked = true;
try{
String fname = sqlFirstName.getText().toString();
String Lname = sqlLastName.getText().toString();
String email = sqlEmail.getText().toString();
String number = sqlMobileNumber.getText().toString();
String loc = sqlCurrentLocation.getText().toString();
DBAdapter entry = new DBAdapter(Registration.this);
entry.open();
entry.createEntry(fname,Lname,email,number,loc);
entry.close();
}catch(Exception e){
e.printStackTrace();
}finally{
if(worked){
Dialog d = new Dialog(this);
d.setTitle("works");
TextView tv = new TextView(this);
tv.setText("Success");
d.setContentView(tv);
d.show();
}
}
break;
}
}
}