You don t say what didn t work, but I ll venture a guess. You re getting a null pointer exception somewhere. One problem with your code is that you ll need to repeat most of the logic that you have in onCreate() when you execute onConfigurationChanged. You have an entirely new set of views in the activity. Otherwise, the member field tv will be null and there won t be listeners attached to your buttons.

http://www.ohchr.org。 根据您的评论,count 我认为,你的发言有点错,而制度正在破坏和重新激发你改变方向的活动。 为保存<条码>>在此种改动中的条目/代码>,上下限<代码>,以返还含有<条码>>的值/打字/代码>的Integer,以及<条码>onCreate (中的这一值,请上LastNonConfiguration Instance()并将其列入Integer。

Why you are Overriding onConfigurationChanged while you don t have need to do this...in your case.don t remove android:configChanges="keyboardHidden|orientation" in manifest file just remove the code

@Override
public void onConfigurationChanged(Configuration newConfig) {
    // TODO Auto-generated method stub
    super.onConfigurationChanged(newConfig);
setContentView(R.layout.main);
//UIActivity();
}

页: 1 清理和重建......

取消这种方法

@Override
public void onConfigurationChanged(Configuration newConfig) {
      ....
}

并明确表明:

甲状腺炎和甲状腺炎

反常或反常?

正义 下面的行文和检查您的活动是否正在恢复? 在你的活动中添加一条线,以创造方法,然后改变方向。 底线是否出现在标识中?

甲型六氯环己烷

在我有同一问题时,我在博客中看到了一个trick。 Try it

1. 创立一种方法,以弥补缺陷

private void getsavedstuff() {
    Object mObject  = getLastNonConfigurationInstance();
}

and use it right after setContentView

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        getsavedstuff();
}

Now here is a solution that makes sense:)

public class Counter_demoActivity extends Activity {
final private static String COUNT_TITLE = "title";
private int restoredCount;
int count;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button add1=(Button)findViewById(R.id.btn1);
    Button sub1=(Button)findViewById(R.id.btn2);
    tv=(TextView)findViewById(R.id.tv1);
    add1.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        count++;
        tv.setText("Your Count is " + count);
    }
});
   sub1.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        count--;
        tv.setText("Your Count is " +count);
    }
});
}
@Override
protected void onSaveInstanceState(Bundle outState) {
    outState.putInt(COUNT_TITLE, count);
    super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
     restoredCount =  savedInstanceState.getInt(COUNT_TITLE);
     count=restoredCount;
                 tv.setText("Your Count is " + restoredCount);
    super.onRestoreInstanceState(savedInstanceState);
}

}

The problem is that you are calling setContentView inside your onConfigurationChanged.

If you overwrite onConfigurationChanged and add android:configChanges="keyboard|keyboardHidden|orientation" your activity will not be destroyed and recreated, instead onConfigurationChanged will be called. If you do not implement it super.onConfigurationChanged is called. The config changed method of the Superclass will rotate your layout without removing the values from all the fields etc. In your case the layout gets rotated correctly and after that you reset the layout yourself with calling setContentView(R.layout.main);