这是我的 TabGroupActivity 的代码。在这里，在任何特定选项卡上 Tab B-> 然后它将启动其子活动 Class C -> 然后单击任何按钮它将再次调用子活动 Class D
现在，每当我按下返回按钮时，从 D 类开始，它会再次重新加载子活动类 C。从 C 类开始，当我按下返回按钮时，它将再次重新加载子活动。
请帮我解决这个问题。我不想重新加载以前的活动。
public class TabGroupActivity extends ActivityGroup {
private ArrayList<String> mIdList;
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
if (mIdList == null) mIdList = new ArrayList<String>();
}
/**
* This is called when a child activity of this one calls its finish method.
* This implementation calls {@link LocalActivityManager#destroyActivity} on the child activity
* and starts the previous activity.
* If the last child activity just called finish(),this activity (the parent),
* calls finish to finish the entire group.
*/
@Override
public void finishFromChild(Activity child) {
LocalActivityManager manager = getLocalActivityManager();
Log.i("Stack,finishFromChild", ""+mIdList);
int index = mIdList.size()-1;
if (index < 1) {
finish();
return;
}
manager.destroyActivity(mIdList.get(index), true);
mIdList.remove(index); index--;
String lastId = mIdList.get(index);
Intent lastIntent = manager.getActivity(lastId).getIntent();
lastIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
Window newWindow = manager.startActivity(lastId, lastIntent);
setContentView(newWindow.getDecorView());
}
/**
* Starts an Activity as a child Activity to this.
* @param Id Unique identifier of the activity to be started.
* @param intent The Intent describing the activity to be started.
* @throws android.content.ActivityNotFoundException.
*/
public void startChildActivity(String Id, Intent intent) {
Window window = getLocalActivityManager().startActivity(Id,intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP));
if (window != null) {
mIdList.add(Id);
setContentView(window.getDecorView());
}
}
/**
* The primary purpose is to prevent systems before android.os.Build.VERSION_CODES.ECLAIR
* from calling their default KeyEvent.KEYCODE_BACK during onKeyDown.
*/
/**
* If a Child Activity handles KeyEvent.KEYCODE_BACK.
* Simply override and add this method.
*/
@Override
public void onBackPressed () {
int length = mIdList.size();
if ( length > 1) {
Log.i("Stack,onback", ""+mIdList);
Activity current = getLocalActivityManager().getActivity(mIdList.get(length-1));
Log.i("Activity in current",""+current);
current.finish();
}
else
{
if(length==1)
{
Activity current = getLocalActivityManager().getActivity(mIdList.get(length-1));
Log.i("Activity in current",""+current);
current.finish();
}
}
}