关于android：如何保存我的活动状态？

How do I save the state of my activity?

本问题已经有最佳答案，请猛点这里访问。

如何保存我的Activity的方式，当用后退按钮关闭并恢复时，与关闭时的方式相同。

这是我的Activity代码：

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public class Levels extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme_NoTitleBar_Fullscreen);
setContentView(R.layout.levels);

final EditText anstext1 = (EditText) findViewById(R.id.anstext1);
Button button1 = (Button) findViewById(R.id.button1);

button1.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
String result = anstext1.getText().toString();
if(result.equals("they"))
setContentView(R.layout.social);
else
Toast.makeText(getApplicationContext(),"Wrong", Toast.LENGTH_LONG).show();
}
});
}
}

相关讨论

您必须实现onSavedinstanceState()，并用要显示的视图的int填充它。

然后，在onCreate(bundle savedinstancestate)方法中，您将从bundle中挖掘int，并将内容视图设置为它。

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public class yourActivity extends Activity {

private static final String KEY_STATE_VIEW_ID ="view_id";
private int _viewId = R.layout.levels;

@Override
public void onCreate(Bundle savedInstanceState) {
if (savedInstanceState != null) {
if (savedInstanceState.containsKey(KEY_STATE_VIEW_ID) {
_viewId = savedInstanceState.getInt(KEY_STATE_VIEW_ID);
}
}
setContentView(_viewId);
// in your onClick set viewId to R.layout.social
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putInt(KEY_STATE_VIEW_ID, _viewId);
}
}

例如：http://www.how-to-develop-android-apps.com/tag/onsaveinstancestate/