OnSharedPreferenceChangeListener未注册首选项更改 [英] OnSharedPreferenceChangeListener not registering change in preference

问题描述

我正在处理列表首选项，并且已经实现了OnSharedPreferenceChangeListener，以基于在列表首选项上选择了哪个项目来更改文本视图上的文本.但是，它没有进行任何更改，并且我的想法已用尽，因此，我们将不胜感激.谢谢

I'm working on listpreferences and I have implemented the OnSharedPreferenceChangeListener to change the text on a textview based on which item is selected on the listpreference. However it doesn't register any changes and I have run out of ideas so any help would be appreciated. Thanks

public class pref extends PreferenceActivity implements OnSharedPreferenceChangeListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.prefs);
    setContentView(R.layout.main);

    TextView text = (TextView) findViewById(R.id.textView1);
    String keys = null;
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
    pref.registerOnSharedPreferenceChangeListener(this);


    keys = pref.getString("listPref1", "");
    if (keys == "ON")
    {
        text.setText("ON");
    }
    else if (keys == "OFF")
    {
        text.setText("OFF");
    }
    else{
        text.setText("Choose One");
    }
}

@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
        String key) {
    //What code to I put in here to have the listener register the change
}

}

推荐答案

您的代码看起来应该可以工作:您可以尝试注销以确保其工作正常.将所有条件代码移到侦听器中.

Your code looks like it should work: you can try logging out to ensure its doing what it should. Move all the conditional code into the listener.

@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
        String key) {
    android.util.Log.v("PREFERENCE CHANGE", "[" + key + "]");
    if ("listPref1".equals(key)) {
        String keys = pref.getString("listPref1", "");
        if (keys == "ON") {
            text.setText("ON");
        } else if (keys == "OFF") {
            text.setText("OFF");
        } else {
            text.setText("Choose One");
        }
    }
}

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