Android 如何在SharedReference更改时更新TextView？

我一直在尝试下面的方法来更新对SharedReference所做的任何更改，但是我很难想出下一步该怎么做。有人吗？：）

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您没有注册OnPreferenceChangedListener。在

onCreate

中调用

userInfo.registeronSharedReferenceChangeListener（this）

，它应该可以工作。

您在任何时候都不会将SharedReferenceChangedListener添加到您的SharedReference中

试试这个：

  userInfo.registerOnSharedPreferenceChangeListener(this);

仅在实例化userInfo对象之后。

仅供尝试

public class CallForwardActivity extends Activity implements OnSharedPreferenceChangeListener
    {
    SharedPreferences userInfo;
    Context context;
    UserController userControl;
    private static final String USERINFO_FILE = "StoredUserInfo";
    private TextView setActiveNumberTV;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.callforward);
        context = this;
        userInfo = this.getSharedPreferences(USERINFO_FILE, 0);
            userInfo.registerOnSharedPreferenceChangeListener(this);
        userControl = new UserController(context);
        setActiveNumberTV = (TextView) findViewById(R.id.activeNumberTextView);
        setActiveNumberTV.setText(userControl.GetActiveNumber());       
        final RelativeLayout showAvailablenumbers = (RelativeLayout) findViewById(R.id.showAvailableNumbers); 
        showAvailablenumbers.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
                Intent i = new Intent(getParent(), AvailableNumbersActivity.class);
                SettingsActivityGroup parentActivity = (SettingsActivityGroup)getParent();
                parentActivity.ReplaceView("Show Available Numbers Activity", i);
            }
        });
    }

    public void onSharedPreferenceChanged(SharedPreferences arg0, String arg1) 
    {
        setActiveNumberTV.setText(arg0.getString(arg1, "default"));
    }

}

---

您错过了在共享首选项chnaged（）上注册。。！

public class CallForwardActivity extends Activity implements OnSharedPreferenceChangeListener
    {
    SharedPreferences userInfo;
    Context context;
    UserController userControl;
    private static final String USERINFO_FILE = "StoredUserInfo";
    private TextView setActiveNumberTV;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.callforward);
        context = this;
        userInfo = this.getSharedPreferences(USERINFO_FILE, 0);
            userInfo.registerOnSharedPreferenceChangeListener(this);
        userControl = new UserController(context);
        setActiveNumberTV = (TextView) findViewById(R.id.activeNumberTextView);
        setActiveNumberTV.setText(userControl.GetActiveNumber());       
        final RelativeLayout showAvailablenumbers = (RelativeLayout) findViewById(R.id.showAvailableNumbers); 
        showAvailablenumbers.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
                Intent i = new Intent(getParent(), AvailableNumbersActivity.class);
                SettingsActivityGroup parentActivity = (SettingsActivityGroup)getParent();
                parentActivity.ReplaceView("Show Available Numbers Activity", i);
            }
        });
    }

    public void onSharedPreferenceChanged(SharedPreferences arg0, String arg1) 
    {
        setActiveNumberTV.setText(arg0.getString(arg1, "default"));
    }

}