Android TextView内容在屏幕锁定时丢失

我有一个里面有用户名的TextView，但当设备屏幕锁定（打开、关闭）时，里面的文本将消失。我尝试将

android:configChanges=“keyboardHidden | orientation”

添加到ManifestFile中，并对TextView使用

android:freezesText=“true”

，但都没有成功

我还使用了：

@Override
protected void onSaveInstanceState(Bundle outState) {
    // TODO Auto-generated method stub
    super.onSaveInstanceState(outState);

    outState.putString("userName", username);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onRestoreInstanceState(savedInstanceState);

    String userName = savedInstanceState.getString("userName");
    TextView viewName = (TextView)this.findViewById(R.id.username);
    viewName.setText(userName);
}

但是onRestoreInstanceState不会在设备屏幕锁定时启动！ 有人知道为什么会发生这种情况吗？我如何防止这种行为？

    <TextView 
         ... 
         android:freezesText="true" />

//or n order to retain data on orientation change you need to implement the two methods:

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    // Read values from the "savedInstanceState"-object and put them in your textview
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    // Save the values you need from your textview into "outState"-object
    super.onSaveInstanceState(outState);
}

//或n为了保留有关方向更改的数据，您需要实施两种方法：
@凌驾
RestoreInstanceState上的受保护无效（Bundle savedInstanceState）{
super.onRestoreInstanceState（savedInstanceState）；
//从“savedInstanceState”对象中读取值，并将其放入textview中
}
@凌驾
SaveInstanceState上受保护的无效（束超出状态）{
//将所需的值从textview保存到“outState”-对象中
super.onSaveInstanceState（超出状态）；
}