我是安卓新手。我开发了一个小型聊天应用程序，它有注册页面、登录屏幕和好友列表屏幕。当用户注册并登录时，他将被重定向到好友列表页面。它运行良好。我在用户第二次注册时使用了 sharedpreference，他们直接重定向到朋友列表页面。但在这里不是我关闭我的应用程序。
谁能帮我？
提前致谢。
这是我的 Registration.java
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
// This is called when the connection with the service has been
// unexpectedly disconnected -- that is, its process crashed.
// Because it is running in our same process, we should never
// see this happen.
imService = null;
Toast.makeText(SignUp.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sign_up_screen);
setTitle("Sign up");
Button signUpButton = (Button) findViewById(R.id.signUp);
Button cancelButton = (Button) findViewById(R.id.cancel_signUp);
usernameText = (EditText) findViewById(R.id.userName);
passwordText = (EditText) findViewById(R.id.password);
passwordAgainText = (EditText) findViewById(R.id.passwordAgain);
eMailText = (EditText) findViewById(R.id.email);
SharedPreferences pref = getSharedPreferences("ActivityPREF", Context.MODE_PRIVATE);
if(pref.getBoolean("activity_executed", false)){
Intent intent = new Intent(this, FriendList.class);
startActivity(intent);
finish();
} else {
Editor ed = pref.edit();
ed.putBoolean("activity_executed", true);
ed.putString("username", usernameText.getText().toString());
ed.putString("password", passwordText.getText().toString());
ed.commit();
}
signUpButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0)
{
if (usernameText.length() > 0 &&
passwordText.length() > 0 &&
passwordAgainText.length() > 0 &&
eMailText.length() > 0
)
{
if (passwordText.getText().toString().equals(passwordAgainText.getText().toString())){
if (usernameText.length() >= 5 && passwordText.length() >= 5) {
Thread thread = new Thread(){
String result = new String();
@Override
public void run() {
result = imService.signUpUser(usernameText.getText().toString(),
passwordText.getText().toString(),
eMailText.getText().toString());
handler.post(new Runnable(){
public void run() {
if (result.equals(SERVER_RES_RES_SIGN_UP_SUCCESFULL)) {
/*editor.putString("register","true");
editor.commit();*/
Toast.makeText(getApplicationContext(),R.string.signup_successfull, Toast.LENGTH_LONG).show();
startActivity(new Intent (SignUp.this, Login.class));
SignUp.this.finish();
}
else if (result.equals(SERVER_RES_SIGN_UP_USERNAME_CRASHED)){
Toast.makeText(getApplicationContext(),R.string.signup_username_crashed, Toast.LENGTH_LONG).show();
//showDialog(SIGN_UP_USERNAME_CRASHED);
}
else //if (result.equals(SERVER_RES_SIGN_UP_FAILED))
{
Toast.makeText(getApplicationContext(),R.string.signup_failed, Toast.LENGTH_LONG).show();
}
}
});
}
};
thread.start();
}
else{
Toast.makeText(getApplicationContext(),R.string.username_and_password_length_short, Toast.LENGTH_LONG).show();
}
}
else {
Toast.makeText(getApplicationContext(),R.string.signup_type_same_password_in_password_fields, Toast.LENGTH_LONG).show();
//showDialog(TYPE_SAME_PASSWORD_IN_PASSWORD_FIELDS); }
}
else {
Toast.makeText(getApplicationContext(),R.string.signup_fill_all_fields, Toast.LENGTH_LONG).show();
}
}
});
}
这是 Login.java
private ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
imService = ((IMService.IMBinder)service).getService();
if (imService.isUserAuthenticated() == true)
{
Intent i = new Intent(Login.this, FriendList.class);
startActivity(i);
Login.this.finish();
}
}
public void onServiceDisconnected(ComponentName className) {
imService = null;
Toast.makeText(Login.this, R.string.local_service_stopped,
Toast.LENGTH_SHORT).show();
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startService(new Intent(Login.this, IMService.class));
setContentView(R.layout.login_screen);
setTitle("Login");
Button loginButton = (Button) findViewById(R.id.login);
cancelButton = (Button) findViewById(R.id.cancel_login);
usernameText = (EditText) findViewById(R.id.userName);
passwordText = (EditText) findViewById(R.id.password);
loginButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0)
{
if (imService == null) {
Toast.makeText(getApplicationContext(),R.string.not_connected_to_service, Toast.LENGTH_LONG).show();
return;
}
else if (imService.isNetworkConnected() == false)
{
Toast.makeText(getApplicationContext(),R.string.not_connected_to_network, Toast.LENGTH_LONG).show();
}
else if (usernameText.length() > 0 &&
passwordText.length() > 0)
{
Thread loginThread = new Thread(){
private Handler handler = new Handler();
@Override
public void run() {
String result = null;
try {
result = imService.authenticateUser(usernameText.getText().toString(), passwordText.getText().toString());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (result == null || result.equals(AUTHENTICATION_FAILED))
{
handler.post(new Runnable(){
public void run() {
Toast.makeText(getApplicationContext(),R.string.make_sure_username_and_password_correct, Toast.LENGTH_LONG).show();
}
});
}
else {
handler.post(new Runnable(){
public void run() {
Intent i = new Intent(Login.this, FriendList.class);
//i.putExtra(FRIEND_LIST, result);
startActivity(i);
Login.this.finish();
}
});
}
}
};
loginThread.start();
}
else {
Toast.makeText(getApplicationContext(),R.string.fill_both_username_and_password, Toast.LENGTH_LONG).show();
}
}
});
cancelButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0)
{
imService.exit();
finish();
}
});
}