Question

我正在构建原生Android应用程序。我有一个菜单，我想显示和隐藏项目，具体取决于登录的人（孩子或父母）。

我在共享偏好设置中保存此人的登录信息。这工作正常。我得到了登录人员的信息。

问题是菜单，它只在某个时候有效。

我是初学者，我们将不胜感激。

public class BaseActivity extends AppCompatActivity {
String auth_user, toolbox_access, results_access;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    SharedPreferences preferences = getSharedPreferences("PREF", MODE_PRIVATE);
    auth_user = (preferences.getString("auth_settings", ""));
    toolbox_access = (preferences.getString("toolbox_access", ""));
    results_access = (preferences.getString("results_access", ""));
}

public void Toolbar(){
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    Drawable drawable = ContextCompat.getDrawable(getApplicationContext(),R.drawable.ic_reorder_black_24dp);
    toolbar.setOverflowIcon(drawable);
    //Toolbar title
    TextView toolbar_title = (TextView)findViewById(R.id.toolbar_title);
    toolbar_title.setText(getString(R.string.action_exercise));
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
     if(auth_user == "Parent"){
           MenuItem item = menu.findItem(R.id.action_card_list);
           item.setVisible(false);
    }

    if(auth_user == "Child"){
        MenuItem item = menu.findItem(R.id.action_card_list);
        item.setVisible(true);
    }
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    if (id == R.id.action_login) {
        startActivity(new Intent(this, LoginActivity.class));
    }
    if (id == R.id.action_exercise) {
        startActivity(new Intent(this, ExerciseListActivity.class));
    }
    if (id == R.id.action_top_problems) {
        startActivity(new Intent(this, ExercisePostActivity.class));
    }
    if (id == R.id.action_test) {
        startActivity(new Intent(this, TestActivity.class));
    }
    if (id == R.id.action_exercise2) {
        startActivity(new Intent(this, AssessmentDailyActivity.class));
    }
    if (id == R.id.action_ocdlist) {
        startActivity(new Intent(this, OcdListActivity.class));
    }
    if (id == R.id.action_card_list) {
        startActivity(new Intent(this, CardActivity.class));
    }

    if (id == R.id.action_results) {
        startActivity(new Intent(this, ResultsActivity.class));
    }
    return super.onOptionsItemSelected(item);
}
}

Answer 1

使用var date = document.getElementById("table").children[0].children[1].innerHTML; var new_date = 06/12/2016; if (date < new_date) ...比较字符串是否相等。

.equals()

Android，显示和隐藏菜单项问题

1 个答案: