私のAndroidアプリケーションでは、タブ内でアクティビティグループを使用しており、以前の画面のリストも維持しています。問題は、画面がロードされた直後に戻ると、Backpressメソッドが呼び出されず、アプリが終了することです。画面で30秒の遅延後に同じことを行うと、期待どおりに機能します。問題をまったく解決できませんでした。コードをデバッグし、新しい画面がスタックリストに追加されていることに気付きましたが、バックプレスメソッド自体はそうではありませんアクティビティとタブグループ クラスにバックプレスを実装しようとしましたが、使用できませんでした。どこが間違っているのか教えてください。アクティビティを追加するために使用するコードは
Intent intent = new Intent(context, TrialActivity.class);
intent.putExtra("feedId", moreitems.get(arg2).getItem_id());
intent.putExtra("heading", moreitems.get(arg2).getItem_name());
TabGroupActivity parentActivity = (TabGroupActivity) ((Activity) context)
.getParent();
parentActivity.startChildActivity(moreitems.get(arg2).getItem_name()
+ Calendar.getInstance().getTimeInMillis(), intent);
MyTabgroup クラスは
@SuppressWarnings("deprecation")
public class TabGroupActivity extends ActivityGroup {
private ArrayList<String> mIdList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (mIdList == null)
mIdList = new ArrayList<String>();
}
@Override
protected void onPause()
{
super.onPause();
}
@Override
protected void onResume() {
// to start the first activity every time on reload( on focus of tab).
// remove the search activity if it is in the stack
if (mIdList != null && mIdList.size() > 0) {
int index = -1;
for (int i = 0; i < mIdList.size(); i++) {
String firstId = mIdList.get(i);
if (firstId != null
&& "search".equalsIgnoreCase(firstId.substring(0,
firstId.length() - 1))) {
index = i;
}
}
if (index != -1) {
LocalActivityManager manager = getLocalActivityManager();
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());
}
}
super.onResume();
}
/**
* 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) {
Alerts.exit("Confirm",
"Do you really wish to exit from iDream Media?", this);
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());
}
/**
* 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.addFlags(Intent.FLAG_ACTIVITY_SINGLE_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.
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
// onBackPressed();
// 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 > 1) {
Activity current = getLocalActivityManager().getActivity(
mIdList.get(length - 1));
current.finishFromChild(current);
}
}
}
どこが間違っているのか教えてください。