如何得到一个值，其他活动

Question

我关注这个网站做项目 http://www.androidhive.info/2012/01/android-login-and-registration-with-php-mysql-and-sqlite/

现在，我想要得到的用户名，对其他活动和显示。 我已经尝试过，但我不能成功。 我该怎么办？ 这是我的代码

public class LoginActivity extends Activity { 
Button btnLogin; 
EditText inputusername; 
EditText inputPassword; 
TextView loginErrorMsg; 

// JSON Response node names 
private static String KEY_SUCCESS = "success"; 
private static String KEY_ERROR = "error"; 
private static String KEY_ERROR_MSG = "error_msg"; 
private static String KEY_UID = "uid"; 
private static String KEY_NAME = "name"; 
private static String KEY_EMAIL = "email"; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login); 



    // Importing all assets like buttons, text fields 
    inputusername = (EditText) findViewById(R.id.loginusername); 
    inputPassword = (EditText) findViewById(R.id.loginPassword); 
    btnLogin = (Button) findViewById(R.id.btnLogin); 
    loginErrorMsg = (TextView) findViewById(R.id.login_error); 

    // Login button Click Event 
    btnLogin.setOnClickListener(new View.OnClickListener() { 



     public void onClick(View view) { 
      String username = inputusername.getText().toString(); 
      String password = inputPassword.getText().toString(); 
      UserFunctions userFunction = new UserFunctions(); 
      Log.d("Button", "Login"); 
      JSONObject json = userFunction.loginUser(username, password); 

      // check for login response 
      try { 
       if (json.getString(KEY_SUCCESS) != null) { 
        loginErrorMsg.setText(""); 
        String res = json.getString(KEY_SUCCESS); 
        if(Integer.parseInt(res) == 1){ 
         // user successfully logged in 
         // Store user details in SQLite Database 
         DatabaseHandler db = new DatabaseHandler(getApplicationContext()); 
         JSONObject json_user = json.getJSONObject("user"); 

         // Clear all previous data in database 
         userFunction.logoutUser(getApplicationContext()); 
         db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID));  


         //get username 
         EditText et = (EditText)findViewById(R.id.loginusername); 
         String name = et.getText().toString(); 

         //new Intent对 
         Intent intent = new Intent(); 
         intent.setClass(LoginActivity.this, DashboardActivity.class); 

         Bundle bundle = new Bundle(); 
         bundle.putString("name",name); 

         intent.putExtras(bundle); 

         startActivity(intent); 

         // Launch Dashboard Screen 
         Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class); 

         // Close all views before launching Dashboard 
         dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
         startActivity(dashboard); 

         // Close Login Screen 
         finish(); 
        }else{ 
         // Error in login 
         loginErrorMsg.setText("Incorrect username/password"); 
        } 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 


} 
} 

public class DashboardActivity extends Activity { 
UserFunctions userFunctions; 
Button btnLogout; 
Button btnViewOrders; 
Button btnViewProfile; 

private EditText hihi; 

String pid; 

private static String KEY_NAME = "name"; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    //get Intent Bundle 
    Bundle bundle = this.getIntent().getExtras();  

    String name = bundle.getString("name");  

    TextView mytv = (TextView)findViewById(R.id.abc); 
    mytv.setText("you name is:" + name); 


    /** 
    * Dashboard Screen for the application 
    * */ 
    // Check login status in database 
    userFunctions = new UserFunctions(); 
    if(userFunctions.isUserLoggedIn(getApplicationContext())){ 
    // user already logged in show databoard 
     setContentView(R.layout.dashboard); 
     btnLogout = (Button) findViewById(R.id.btnLogout); 

     btnLogout.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View arg0) { 
       // TODO Auto-generated method stub 
       userFunctions.logoutUser(getApplicationContext()); 
       Intent login = new Intent(getApplicationContext(), LoginActivity.class); 
       login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
       startActivity(login); 
       // Closing dashboard screen 
       finish(); 
      } 
     }); 




    }else{ 
     // user is not logged in show login screen 
     Intent login = new Intent(getApplicationContext(), LoginActivity.class); 
     login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     startActivity(login); 
     // Closing dashboard screen 
     finish(); 
    } 
}  

} 

Answer 1

试试下面的代码：

从LoginActivity传值：

Intent intent = new Intent(getApplicationContext(),DashboardActivity.class); 
intent.putExtra("name",name); 
startActivity(intent); 

要DashboardActivity获得价值：

Bundle extras = getIntent().getExtras(); 
if (extras != null) { 
String name = extras.getString("name"); 
} 

Answer 2

你创建了两个意图。第一个包含该包，但是您立即创建一个没有包的意向来启动第二个包含第一个包的活动。你可以只添加标志的原意，如果你想：

//new Intent对 
Intent intent = new Intent(); 
intent.setClass(LoginActivity.this, DashboardActivity.class); 

Bundle bundle = new Bundle(); 
bundle.putString("name",name); 

intent.putExtras(bundle); 
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

startActivity(intent); 

有没有必要进行第二次的意图都没有。

Answer 3

尝试以下操作： -

pass value from one activity (Activity1.java) 

     Intent myIntent = new Intent(Activity1.this, Activity2.class); 
     myIntent.putExtra("name","name"); 
     myIntent.putExtra("id","65"); 
     startActivity(myIntent); 

get value from another activity (Activity2.java) 

    Intent intent = getIntent(); 
    String name=intent.getStringExtra("name"); 
    String id=intent.getStringExtra("id"); 

Answer 4

代替使用意图它将是非常简单和可靠，如果您使用“共享首选项”