Question

然而,我试图在我的活动中挽救一些价值观,但我感到有问题,因为我与独居的国家一道拯救了这些价值观,并在居住国恢复,我拯救了几年,第一次拯救了屏幕改变方向,使pin子重新流行,使其达到最后价值,但并不是在我再次改变方向的时候。

我的取向在于我的发言中,我有两种挽救和恢复方法,但似乎不奏效,我是否需要在Pause做些什么?

我的守则是:

    int years;//global variable
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Spinner spinnerYears = (Spinner) findViewById(R.id.spinYears);//Spinner
            final ArrayAdapter <Integer> adapter = new ArrayAdapter <Integer>(this,android.R.layout.simple_spinner_item );
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        for(int i=0;i<=100;i++)
        {
           adapter.add(i);
        }
        spinnerYears.setAdapter(adapter);
        years = spinnerYears.getSelectedItemPosition();

   }//onCreate

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);

  savedInstanceState.putInt("MyInt", years);


}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  Spinner spinnerYears = (Spinner) findViewById(R.id.spinYears);//Spinner
    final ArrayAdapter <Integer> adapter = new ArrayAdapter <Integer> (this,      android.R.layout.simple_spinner_item );
           adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        for(int i=0;i<=100;i++)
     {
        adapter.add(i);
     }

      spinnerYears.setAdapter(adapter);
      TextView tvYears = (TextView) findViewById(R.id.tvYears);//spinner Tv
  tvYears.setVisibility(TextView.GONE);


 int myInt = savedInstanceState.getInt("MyInt");
  spinnerYears.setSelection(myInt);//
  Toast.makeText(getBaseContext(), "Restored int"+myInt, Toast.LENGTH_LONG).show();
}

Answer 1

Because you don t handle the event of changing orientation, so everytime you change orientation, your program (or Activity) is re-created, which means the onCreate() method is called always; which leads to a result that onSaveInstanceState() and onRestoreInstanceState() never being called.

http://developer.android.com/vis/android/app/Actative.html#ConfigurationChanges”rel=“nofollow” http://developer.android.com/vis/android/app/Actative.html#ConfigurationChanges 。

为了确定这一点,在<代码>AndroidManifest.xml上添加了这一特性:

android:configChanges="orientation"

避免<条码>活性的重新启用,而且,与这一条完全吻合!

Answer 2

在onRestoreInstanceState()中,你从未将变式年<<>代码/代码>的贴现值转让给下。您将它置于暗中,然后无视它。因此,在<条码>上,<条码>年限/代码>。吨位尚未确定,可节省这一未定值(0)。



1. 如果您将getInt()行文改为:

years = savedInstanceState.getInt("MyInt");
spinnerYears.setSelection(years);


它应当开始工作。 Good Luck!

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