我需要一些解释/建议，也许还有一些如何ActivityGroup用 Fragments 替换我的课程的例子。我在一年前使用不推荐使用的TabActivity组合编写了该应用程序，ActivityGroup因此在输入不同的活动时我仍然可以保留选项卡。所以现在我想重写我的应用程序并使用新的 API，我真的很好奇如何使用带有片段的活动重写方法和整个想法，并在与应用程序的整个交互过程中保留标签栏。我不需要TabActivity用新标签和ActionBar. 这是我的 TabGroupActivity 的示例，我使用它来将标签栏保持在应用程序的底部：
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>();
}
/*
* 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;
}
try {
manager.destroyActivity(mIdList.get(index), true);
mIdList.remove(index);
index--;
String lastId = mIdList.get(index);
if(manager.getActivity(lastId).getIntent() == null){
finish();
} else if(manager.getActivity(lastId).getIntent() != null){
Intent lastIntent = manager.getActivity(lastId).getIntent();
Window newWindow = manager.startActivity(lastId, lastIntent);
setContentView(newWindow.getDecorView());
}
}catch (NullPointerException e){
finish();
}
}
/*
* 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_CLEAR_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) {
//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));
try{
current.finish();
}catch(Exception e){
finish();
}
}
}
}
所以基本上我需要一点帮助来了解如何实现与 Instagram 应用程序相同的交互。
每一种帮助都非常感谢！