android - onPreferenceClick 和 OnPreferenceClickListener

Question

我正在尝试在我的java代码中评估我的偏好，以便启用/禁用其他选项，如果他们选择不执行其他选项...到目前为止，我试图只实现OnPreferenceClickListener，但是我从未看到过 toast 免受变化。我究竟做错了什么？似乎还有很多类似的其他问题，但我看不到引用它们的错误。

public class UserSettingActivity extends PreferenceActivity implements OnPreferenceClickListener{
    SharedPreferences mPreferences;
    Boolean frequency;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);
    }


    @Override
    public boolean onPreferenceClick(Preference preference) {
        mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        frequency = mPreferences.getBoolean("frequency", true);

        Context context = getApplicationContext();
        Toast.makeText(context, "Hello toast 0!", Toast.LENGTH_LONG).show();

        if (!frequency) {
            Context context2 = getApplicationContext();
            Toast.makeText(context2, "Hello toast 1!", Toast.LENGTH_LONG).show();

        } else if (preference.getKey().equals("schedulestop")) {

        } else if (preference.getKey().equals("priority")) {

        } else {
            Context context3 = getApplicationContext();
            Toast.makeText(context3, "Hello toast 0!", Toast.LENGTH_LONG).show();
        }
        return false;
    }

}

Answer 1

您必须为每个单独的首选项注册 PreferenceClickListener

somePreference.setOnPreferenceClickListener(this);  

或者您可以使用getSharedPreferences().registerOnSharedPreferenceChangeListener来获取所有首选项。

public class UserSettingActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener{
SharedPreferences mPreferences;
Boolean frequency;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.settings);
}

@SuppressWarnings("deprecation")
@Override
protected void onPause()
{
    super.onPause();

    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}

@SuppressWarnings("deprecation")
@Override
protected void onResume()
{
    super.onResume();

    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}


@SuppressWarnings("deprecation")
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    if (key.equals("schedulestop")) {
         // do something
     }
     else if (key.equals(......
}
}