[英]Changing Toolbar to drawer/menu icon after popBackStack()?
我有一個帶有MainActivity
的Android應用程序,可以在按下按鈕時將內容區域與片段交換。 使用當前代碼(如下所示),它可以成功
...但是工具欄本身不會更新以在其返回其原始狀態時顯示“抽屜”/“菜單”(漢堡包)按鈕( getSupportFragmentManager().getBackStackEntryCount() == 0
)。 我想我需要在我的活動上實現FragmentManager.OnBackStackChangedListener
,盡管我的嘗試並沒有那么成功。 我也看過提到syncState()
,雖然我也沒有太多的運氣。
在交換和彈出片段后,如何將工具欄主頁按鈕返回到“抽屜”/“菜單”外觀和功能?
我的代碼可以在下面找到。 試圖在分享之前簡化它,希望我沒有削減任何重要的東西。
MainActivity.java
:
package me.stashhh.stashboxes;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import me.stashhh.stashboxes.model.CountryManager;
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
private ActionBarDrawerToggle mDrawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
// normal onCreate stuff
super.onCreate(savedInstanceState);
// The ContentView that we're referencing
setContentView(R.layout.activity_main);
// Toolbar setup
toolbar = (Toolbar) findViewById(R.id.toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
}
// Drawer setup
DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
mDrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
toolbar,
R.string.action_drawer_open,
R.string.action_drawer_close
);
mDrawerLayout.setDrawerListener(mDrawerToggle); // REQUIRED FOR ARROW ANIMATION. Fml.
mDrawerToggle.syncState();
// Listen for changes in the back stack
getSupportFragmentManager().addOnBackStackChangedListener(this);
}
public void onBackPressed() {
// Catch back action and pops from backstack
// (if you called previously to addToBackStack() in your transaction)
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportFragmentManager().popBackStack();
} else {
// Default action on back pressed
super.onBackPressed();
}
}
public boolean onOptionsItemSelected(MenuItem item) {
// Get item selected and deal with it
switch (item.getItemId()) {
case android.R.id.home:
//called when "up" (back button) is called in toolbar
onBackPressed();
return true;
}
return true; // default return since 'boolean'; not sure if proper?
}
/**
* Called when the user clicks the "View Stashboxes" button
*/
public void viewStashboxes(View view) {
// update the main content by replacing fragments
Fragment stashboxesFragment = new StashboxesFragment();
Bundle args = new Bundle();
args.putString(StashboxesFragment.ARG_TEST_STRING, "Testing 1.. 2.. 3..");
stashboxesFragment.setArguments(args);
FragmentManager fragmentManager = getSupportFragmentManager();
// Add this transaction to the back stack...
// http://developer.android.com/training/implementing-navigation/temporal.html#back-fragments
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_frame, stashboxesFragment, "stashboxesFragment");
fragmentTransaction.addToBackStack("stashboxesFragment");
fragmentTransaction.commit();
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// If drawer is open, we have to close it...
DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer); // The drawer layout
LinearLayout mDrawerList = (LinearLayout) findViewById(R.id.left_drawer); // The drawer "list" itself
mDrawerLayout.closeDrawer(mDrawerList); // Close the drawer list
}
}
/**
* Fragment that appears in the "content_frame"
*/
public static class StashboxesFragment extends Fragment {
public StashboxesFragment() {
// empty constructor required for fragment subclasses
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// REDACTED CODE FOR SIMPLICITY.
// inflate a layout in the main content area.
return rootView;
}
}
}
我是Android開發的新手,所以任何其他批評你也可能會受到贊賞。 謝謝。
這對我onBackPressed()
:請更新你的onBackPressed()
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if(frgManager.getBackStackEntryCount()>0){
getSupportFragmentManager().popBackStack();
// shows the drawer icon when on moving back
mDrawerToggle.setDrawerIndicatorEnabled(true);
drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setDisplayShowHomeEnabled(false);
getSupportActionBar().setHomeButtonEnabled(false);
}else{
super.onBackPressed();
}
mDrawerToggle.syncState();
}
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