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在我的主要活动中,按设置按钮打开一个AppCompatActivity并将FrameLayout作为片段的容器。在OnCreate方法中,我添加了PreferenceScreen容器的片段。由于addBackStack导致两个片段重叠
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Toolbar toolbar = (Toolbar) findViewById(R.id.custom_toolbar);
setSupportActionBar(toolbar);
ActionBar ab = getSupportActionBar();
if (ab != null) {
ab.setDisplayHomeAsUpEnabled(true);
ab.setTitle("Settings");
}
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = null;
if (savedInstanceState == null) {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragment = SettingsFragment.newInstance(null);
fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
}
按下再次打开另一个按钮叫选项,代替片段与片段选项将当前类堆栈中。
@Override
public boolean onPreferenceStartScreen(PreferenceFragmentCompat caller, PreferenceScreen pref) {
FragmentManager manager = getSupportFragmentManager();
SettingsSubscreenFragment fragment = null;
Bundle args = new Bundle();
switch (pref.getKey()) {
case "pref_key_rejection_options":
getSupportActionBar().setTitle("Rejection Options");
fragment = SettingsSubscreenFragment.newInstance("Options");
break;
}
args.putString(PreferenceFragmentCompat.ARG_PREFERENCE_ROOT, pref.getKey());
if (fragment != null) {
fragment.setArguments(args);
}
FragmentTransaction ft = manager.beginTransaction();
ft.replace(R.id.fragment_container, fragment, pref.getKey());
ft.addToBackStack(null);
ft.commit();
return true;
}
当我按下向上按钮,我只是更换选项片段第一个片段,设置,不弹出返回堆叠。
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
getSupportActionBar().setTitle("Settings");
FragmentManager fragmentManager;
FragmentTransaction ft;
Fragment fragment = null;
if (getSupportFragmentManager().findFragmentByTag("pref_key_options") != null) {
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
fragment = SettingsFragment.newInstance(null);
ft.replace(R.id.fragment_container, fragment);
ft.commit();
fragmentManager.getFragments().clear();
return true;
} else {
return super.onOptionsItemSelected(item);
}
}
return super.onOptionsItemSelected(item);
}
所以,再次打开选项片段将再添备份堆栈和onBackPress,只弹出最上面和离开它的影子重叠在后面堆栈注册的另一个。
@Override
public void onBackPressed() {
int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
if (backStackCount >= 1) {
getSupportActionBar().setTitle("Settings");
getSupportFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
的差不多的情形就像是从here,问题的第三张照片,但我不能让他们的建议工作。
我在做什么错,我能做些什么来完成这项工作?非常感谢。
我对这些碎片和AppCompatActivity使用'PreferenceFragmentCompat'来存放这些碎片的容器。对于'FragmentTransaction',我也使用支持库。 –