[英]Up Navigation in Fragments with Navigation Drawer
我想使用一個稱為MainActivity的活動,該活動具有抽屜布局和主要內容容器(使用FrameLayout)。 現在的抽屜布局只是一個普通的ListView,目前只有兩個項目。 我為每個項目制作了兩個片段。 第一項是“首頁”,第二項是“已保存”。 調用MainActivity onCreate()時,我用HomeFragment替換了容器,然后可以從抽屜中導航到SavedFragment。 導航工作完美,沒有問題。 我要實現的任務是,每當我通過單擊抽屜上的第二項轉到SavedFragment時,“漢堡包”圖標應更改為“后退”按鈕/“向上”按鈕。 我設法通過討論同一問題上的許多StackOverflow主題來更改它,但是我無法在其上添加click事件。 它不聽點擊。 我在StackOverflow上閱讀了一些非常好的文章,並期望它也對我有用,但是也許我在代碼的某個地方錯了。 所以我在這里共享代碼:
MainActivity(僅應用程序中的活動)代碼
public class MainActivity extends ActionBarActivity implements AdapterView.OnItemClickListener {
Toolbar toolbar;
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView listView;
Fragment mFragment;
ArrayList<NavigationDataRecord> drawerRecord;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
listView = (ListView) findViewById(R.id.drawer_left);
listView.setOnItemClickListener(this);
drawerRecord = new ArrayList<NavigationDataRecord>();
drawerRecord.add(new NavigationDataRecord(R.mipmap.ic_home_grey600_24dp, "Home"));
drawerRecord.add(new NavigationDataRecord(R.mipmap.ic_save_grey600_24dp, "Saved"));
CustomAdapter adapter = new CustomAdapter(this, R.layout.list_row, drawerRecord);
listView.setAdapter(adapter);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar,
R.string.app_name, R.string.app_name) {
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
invalidateOptionsMenu();
}
};
mFragment = new HomeFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.container, mFragment).commit();
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position) {
case 0:
mFragment = new HomeFragment();
break;
case 1:
mFragment = new SavedFragment();
break;
default:
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.container,mFragment).addToBackStack(null).commit();
mDrawerLayout.closeDrawer(listView);
}}
保存的片段代碼
public class SavedFragment extends Fragment {
List<SavedInformation> list;
RecyclerView cardView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.saved_fragment, container, false);
list = new ArrayList<SavedInformation>();
makeCardList();
cardView = (RecyclerView) view.findViewById(R.id.cardList);
//cardView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
cardView.setLayoutManager(llm);
SavedInformationAdapter adapter = new SavedInformationAdapter(list, getActivity());
cardView.setAdapter(adapter);
return view;
}
private void makeCardList() {
DatabaseAdapter adapter = new DatabaseAdapter(getActivity());
Cursor cursor = adapter.getData();
while (cursor.moveToNext()) {
SavedInformation information = new SavedInformation();
information.setUsername(cursor.getString(0));
information.setDomainName(cursor.getString(1));
information.setImageURL(cursor.getString(2));
list.add(information);
}
}}
我嘗試了一些操作,但是沒有運氣,因此我發布了嘗試實現解決方案的干凈代碼版本。
我確信這些解決方案是正確的,但是我無法理解為什么這些解決方案對我不起作用。
我應用了此處給出的解決方案: 使用片段時在Android導航抽屜圖像和Up插入符之間切換
如果要使用片段,則必須在MainActivity中使用NavigationUp
@Override
public boolean onSupportNavigateUp() {
getSupportFragmentManager().popBackStack();
return true;
}
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