@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
savedInstanceState.putString("foo", "bar");
}
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
String myString = savedInstanceState.getString("foo");
Log.i("debug", "saved data: " + myString);
}
我试着在活动中保留一些价值,但我收到以下错误:06-23 23:09:44.038: E/AndroidRuntime(17584): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.johanberntsson.activitytest/se.johanberntsson.activitytest.TestActivity}: java.lang.NullPointerException
获取savedInstanceState值,NullPointerException异常
我错过了什么吗?在savedInstanceState捆绑节约值作为感谢
试井如果'savedInstanceState',看它是否是'之前调用null''的getString(...)'将是一个良好的开端。你如何努力“保留一些价值”?也许使用'SharedPreferences'可能是一个更好的选择。 – Squonk