Question

我有一个小登录程序，可将数据保存到共享首选项中。主要活动有＆＃34;登录＆＃34;和＆＃34;帐户＆＃34; 按钮。当共享首选项为空时，我想禁用登录按钮，并启用＆＃34;帐户＆＃34;用户注册我第二个活动帐户的按钮。如果共享首选项为空，如何启用/禁用2个按钮？

活动1

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_interface);

final Button login = (Button)findViewById(R.id.Login);
final Button account = (Button)findViewById(R.id.Account);
login.setEnabled(false);
login.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0) {
        startActivity(new Intent(MainActivity.this, Summation.class));

    }
});


account.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0) {
        startActivity(new Intent(MainActivity.this, Append.class));
    }
});
Button exit = (Button)findViewById(R.id.Exit);
exit.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0) {
        finish();
        System.exit(0);
    }
});

活动2

 protected void onCreate(Bundle savedInstanceState){
 super.onCreate(savedInstanceState);
 Stetho.initializeWithDefaults(this);
 setContentView(R.layout.append_interface);


final EditText usernameAppend = (EditText)findViewById(R.id.usernameAppend);
final EditText passwordAppend = (EditText)findViewById(R.id.passwordAppend);

//this buttons appends the username and password to the SharedPreferences
Button append = (Button)findViewById(R.id.Append);
append.setOnClickListener(new View.OnClickListener() {
     public void onClick(View arg0) {
         final SharedPreferences mySharedPref = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
         final SharedPreferences.Editor editor = mySharedPref.edit();
        //Append get data
         final String un = usernameAppend.getText().toString();
         editor.putString(editorUsername,un);
         editor.commit();
         final String pw = passwordAppend.getText().toString();
         editor.putString(editorPassword, pw);
         editor.commit();
        if(mySharedPref != null){
            Toast.makeText(Append.this,"Account saved",Toast.LENGTH_LONG).show();

            startActivity(new Intent(Append.this, MainActivity.class));

        }else{
            Toast.makeText(Append.this,"Please enter again",Toast.LENGTH_LONG).show();

        }

        }

    }
);
//Exit button,, exits the app
Button exit = (Button)findViewById(R.id.Exit);
exit.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
    finish();
    System.exit(0);
     }
 });

 }

Answer 1

在第1次活动中检查您的共享偏好是否存在。第一次它将为null。

     btnLogin.setEnabled(false);
     btnAccount.setEnabled(false);
     SharedPreferences mPrefs=this.getSharedPreferences(Your_Preference_Name,Context.MODE_PRIVATE);
    if(mPrefs==null)
    {
        btnAccount.setEnabled(true);
    }
    btnAccount.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });
    btnLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });

如何禁用其他活动的按钮

1 个答案: