Question

我有Splash Activity => Login Activity => Main Activity.... 一旦用户登录我的用户应该直接重定向到主要活动，直到LOGOUT .....

请给我一个具体的解决方案......在哪个活动中做什么..

我正在使用网络服务....建议我，如果SQ Lite需要或共享偏好或Session.Class .....

请具体......在哪个活动/班级中做什么......

登录前。。

Splash Activity => Login Activity => Main Activity

我希望LOGIN之后的流程就像这样..

Splash Activity =>Main Activity ....

提前谢谢.....

SplashActivity.java 公共类Splash扩展了Activity {

Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);

    Thread timerThread = new Thread(){
        public void run(){
            try{
                sleep(3000);
            }catch(InterruptedException e){
                e.printStackTrace();
            }finally{

                String sharedPrefId     = "MyAppPreference";
                SharedPreferences prefs = getSharedPreferences(sharedPrefId, 0);

                boolean isLoggedIn      = prefs.getBoolean("isLoggedIn", false);
                if(isLoggedIn)
                {
                    // Show Main Activity
                    Intent intent1= new Intent(Splash.this,SnetHome.class);
                    startActivity(intent1);
                }
                else
                {
                    // Show Login activity
                    Intent intent2= new Intent(Splash.this,Login.class);
                    startActivity(intent2);
                }
                //if{
                //if user redirect to LoginActivity
                //Intent intent = new Intent(Splash.this,Login.class);
                //startActivity(intent);
                //}else{
                     //otherwise redirect to SnetHome activity
                // }
            }
        }
    };
    timerThread.start();
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    finish();
}

}

Login.java

公共类登录扩展AppCompatActivity实现了OnClickListener {

private EditText user, pass;
private Button mSubmit, mRegister;

// Progress Dialog
private ProgressDialog pDialog;

// JSON parser class
JSONParser jsonParser = new JSONParser();

// php login script location:

// localhost :
// testing on your device
// put your local ip instead, on windows, run CMD > ipconfig
// or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL =
// "http://xxx.xxx.x.x:1234/webservice/login.php";

// testing on Emulator:
private static final String LOGIN_URL = "http://192.168.1.106/SnetWebservice/login.php";

// testing from a real server:
// private static final String LOGIN_URL =
// "http://www.mybringback.com/webservice/login.php";

// JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";

private Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);


    //toolbar
    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    // setup input fields
    user = (EditText) findViewById(R.id.username);
    pass = (EditText) findViewById(R.id.password);

    // setup buttons
    mSubmit = (Button) findViewById(R.id.login);
    mRegister = (Button) findViewById(R.id.register);

    // register listeners
    mSubmit.setOnClickListener(this);
    mRegister.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent inte = new Intent(Login.this, Register.class);
            startActivity(inte);
        }
    });

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
        case R.id.login:
            new AttemptLogin().execute();
            break;
            /* case R.id.register:
            Intent i = new Intent(this, Register.class);
            startActivity(i);
            break;
            */
        default:
            break;
    }
}

class AttemptLogin extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(Login.this);
        pDialog.setMessage("Attempting login...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected String doInBackground(String... args) {
        // TODO Auto-generated method stub
        // Check for success tag
        int success;
        String username = user.getText().toString();
        String password = pass.getText().toString();
        try {
            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("username", username));
            params.add(new BasicNameValuePair("password", password));

            Log.d("request!", "starting");
            // getting product details by making HTTP request
            JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "POST",
                    params);

            // check your log for json response
            Log.d("Login attempt", json.toString());

            // json success tag
            success = json.getInt(TAG_SUCCESS);
            if (success == 1) {
                Log.d("Login Successful!", json.toString());
                // save user data
                SharedPreferences prefs = PreferenceManager
                        .getDefaultSharedPreferences(Login.this);
                Editor edit = prefs.edit();
                edit.putString("username", username);
                edit.commit();
                prefs.edit().putBoolean("isLoggedIn", true).commit();
                Intent i = new Intent(Login.this, SnetHome.class);
                finish();
                startActivity(i);
                return json.getString(TAG_MESSAGE);
            } else if (success == 0) {
                Log.d("Login Failure!", json.getString(TAG_MESSAGE));
                return json.getString(TAG_MESSAGE);
            }else {
                Log.d("Login Failure!", json.getString(TAG_MESSAGE));
                return json.getString(TAG_MESSAGE);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;

    }

    protected void onPostExecute(String file_url) {
        // dismiss the dialog once product deleted
        pDialog.dismiss();
        if (file_url != null) {
            Toast.makeText(Login.this, file_url, Toast.LENGTH_LONG).show();
        }

    }
}

}

Answer 1

喜欢这个

onCreate of Spalsh Activity

if(isLogin)  //value comes from Shared Preference 
{
Go to Main 
}else 
{
Go to Login
}

Answer 2

使用SharedPreference将boolean变量存储为isUserLoggedIn如果用户已登录，那么它将true存储false，然后检查值SharedPreference的{{1}}。

Answer 3

您可以使用SharedPreference来实现此目的。您需要在SplashActivity中实现逻辑。您需要使用共享首选项中存储的值检查是否已登录，并根据该值显示下一个活动。

在SplashActivity（启动登录活动的位置）中，添加如下逻辑：

// Retrieving your app specific preference
String sharedPrefId     = "MyAppPreference";
SharedPreferences prefs = getSharedPreferences(sharedPrefId, 0);

boolean isLoggedIn      = prefs.getBoolean("isLoggedIn", false);
if(isLoggedIn)
{ 
    // Show Main Activity
}
else
{
    // Show Login activity
}

在您的LoginActivity中，成功登录后将值设置为true：

prefs.edit().putBoolean("isLoggedIn", true).commit();

如何在应用程序启动时跳过LauncherActivity并调用另一个Activity

3 个答案: