我正在我的应用程序中使用选项卡。在 TabHost 类上工作以使其自定义。
当我有PARENT --> CHILD活动时，在这种情况下，在back press时，我的应用程序中不会调用 Parent Activity 的onResume。
我正在使用以下代码：
public class TabGroupActivity extends ActivityGroup {
private ArrayList<String> mIdList;
private HashMap<String, Window> mWindowStorage = new HashMap<String, Window>();//UPDATED
private boolean _isFromResume;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
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();
int index = mIdList.size()-1;
if (index < 1) {
finish();
return;
}
String actName = mIdList.get(index);
manager.destroyActivity(actName, true);
mWindowStorage.remove(actName);
mIdList.remove(index); index--;
String lastId = mIdList.get(index);
Window newWindow = null;
if(mWindowStorage.containsKey(lastId)){
newWindow = mWindowStorage.get(lastId);
}else{
Intent lastIntent = manager.getActivity(lastId).getIntent();
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 = null;
if(mWindowStorage.containsKey(Id)){
window = mWindowStorage.get(Id);
if(_isFromResume){
setFromResume(false);
mIdList.clear();
mIdList.add(Id);
mWindowStorage.clear();
mWindowStorage.put(Id, window);
}
}else{
window = getLocalActivityManager().startActivity(Id,intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
if (window != null) {
mIdList.add(Id);
mWindowStorage.put(Id, window);
}
}
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.
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
//preventing default implementation previous to android.os.Build.VERSION_CODES.ECLAIR
return true;
}
return super.onKeyDown(keyCode, event);
}
/**
* Overrides the default implementation for KeyEvent.KEYCODE_BACK
* so that all systems call onBackPressed().
*/
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
onBackPressed();
return true;
}
return super.onKeyUp(keyCode, event);
}
/**
* If a Child Activity handles KeyEvent.KEYCODE_BACK.
* Simply override and add this method.
*/
@Override
public void onBackPressed () {
int length = mIdList.size();
if ( length > 0) {
Activity current = getLocalActivityManager().getActivity(mIdList.get(length-1));
current.finish();
}
}
public void setFromResume(boolean isFromResume) {
_isFromResume = isFromResume;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Activity activity = getLocalActivityManager().getCurrentActivity();
RegisterDeRegisterResponse register = RegisterDeRegisterResponse
.getInstance();
register.notifyRegisteredUser(requestCode, resultCode, data);
register.deRegisterForServerResponse((IResultResponse) activity);
}
public void switchTab(int i) {
WeddingTabActivity parentActivity = (WeddingTabActivity) getParent();
parentActivity.switchTab(i);
}
}
还使用默认的 startChildActivity(String Id, Intent intent) 和 finishFromChild(Activity child)方法，但在这种情况下，每个 Activity 都会在 BackPress 上重新启动。
@Override
public void finishFromChild(Activity child) {
LocalActivityManager manager = getLocalActivityManager();
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();
Window newWindow = manager.startActivity(lastId, lastIntent);
setContentView(newWindow.getDecorView());
}
public void startChildActivity(String Id, Intent intent) {
Window window = getLocalActivityManager().startActivity(Id,intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
if (window != null) {
mIdList.add(Id);
setContentView(window.getDecorView());
}
}