问题
What I am trying to achieve is to have a fragment that on tablet it shows as a DialogFragment, while on smartphone it would be shown as a regular fragment. I am aware there is already a similar post, but I am not able to make that work - apply the style to fragment.
To show things top down, MainActivity.java:
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.action_next) {
decideToNext();
return true;
}
return super.onOptionsItemSelected(item);
}
private void decideToNext() {
String device = getString(R.string.device);
if ("normal".equalsIgnoreCase(device)) {
Intent intent = new Intent(this, DetailedActivity.class);
startActivity(intent);
} else if ("large".equalsIgnoreCase(device)) {
Log.d("SOME_TAG", "Yes, I am seeing this line on tablet only");
DetailedFragment fragment = DetailedFragment.newInstance();
getSupportFragmentManager().beginTransaction().add(fragment, "MAGIC_TAG").commit();
}
}
}
DetailedActivity is nothing much:
public class DetailedActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detailed_activity);
}
}
its layout:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root_container"
android:name="com.myapps.sampleandroid.DetailedFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
and the interesting DetailedFragment:
public class DetailedFragment extends Fragment {
public static DetailedFragment newInstance() {
return new DetailedFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Context contextThemeWrapper = new ContextThemeWrapper(getActivity(), R.style.MyDialogTheme);
LayoutInflater localInflater = inflater.cloneInContext(contextThemeWrapper);
return localInflater.inflate(R.layout.detailed_fragment, container, false);
}
}
... and its layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Regular Text" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button Dummy" />
</LinearLayout>
In onCreateView I've tried to set the custom styling but it doesn't seem to work for tablet.
Styling
res/values/styles.xml contains:
<resources>
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
</style>
<style name="MyDialogTheme" />
</resources>
while res/values-large/styles.xml:
<resources>
<!-- Is there anything I should add here? -->
<style name="MyDialogTheme" parent="@android:style/Theme.Dialog"/>
</resources>
I've nested MyDialogTheme from Theme.Dialog, but it doesn't seem to help.
On smartphone when tapping on "NEXT" action bar menu item I am seeing the detailed activity (snapshot from an SG2):
while tapping on the same "NEXT" menu item from the tablet it doesn't do anything (except viewing the message on Logcat: Yes, I am seeing this line).
What should I add more in styles.xml or in code in order to see DetailedFragment as a dialog for tablet?
EDIT
I've tried the solution Little Child proposed (to have a DialogFragment contain my initial fragment and show it). So, I've added a WrapperDetailedFragment:
public class WraperDetailedFragment extends DialogFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.wrap_detailed_fragment, container, false);
}
}
its layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root_container_dialog"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/wrapped_fragment_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.myapps.sampleandroid.DetailedFragment" />
</LinearLayout>
The code from MainActivity changes to:
private void decideToNext() {
String device = getString(R.string.device);
if ("normal".equalsIgnoreCase(device)) {
Intent intent = new Intent(this, DetailedActivity.class);
startActivity(intent);
} else if ("large".equalsIgnoreCase(device)) {
Log.d("SOME_TAG", "Yes, I am seeing this line ...");
WraperDetailedFragment fragment = new WraperDetailedFragment();
fragment.show(getSupportFragmentManager(), "MAGICAL_TAG");
}
}
but when I'm trying to add this DialogFragment I am getting the following crash:
android.view.InflateException: Binary XML file line #8: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at com.myapps.sampleandroid.WraperDetailedFragment.onCreateView(WraperDetailedFragment.java:12)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:304)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at com.myapps.sampleandroid.WraperDetailedFragment.onCreateView(WraperDetailedFragment.java:12)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Binary XML file line #8: Duplicate id 0x7f050047, tag null, or parent id 0x0 with another fragment for com.myapps.sampleandroid.DetailedFragment
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:290)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
... 28 more
回答1:
This issue can be easily fixed if instead of trying to make a Fragment look like a DialogFragment I would look from the opposite angle: make a DialogFragment look like a Fragment - after all, a DialogFragment is a Fragment!
The key of this fix is to call or not DialogFragment.setShowsDialog();
So changing the DetailedFragment to:
public class DetailedFragment extends DialogFragment {
private static final String ARG_SHOW_AS_DIALOG = "DetailedFragment.ARG_SHOW_AS_DIALOG";
public static DetailedFragment newInstance(boolean showAsDialog) {
DetailedFragment fragment = new DetailedFragment();
Bundle args = new Bundle();
args.putBoolean(ARG_SHOW_AS_DIALOG, showAsDialog);
fragment.setArguments(args);
return fragment;
}
public static DetailedFragment newInstance() {
return newInstance(true);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
if (args != null) {
setShowsDialog(args.getBoolean(ARG_SHOW_AS_DIALOG, true));
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.detailed_fragment, container, false);
}
}
its layout remains as it was, DetailedActivity changes to:
public class DetailedActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detailed_activity);
if (savedInstanceState == null) {
DetailedFragment fragment = DetailedFragment.newInstance(false);
getSupportFragmentManager().beginTransaction().add(R.id.root_layout_details, fragment, "Some_tag").commit();
}
}
}
its layout as well:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root_layout_details"
android:layout_width="match_parent"
android:layout_height="match_parent" />
and the caller activity does only:
private void decideToNext() {
String device = getString(R.string.device);
if ("normal".equalsIgnoreCase(device)) {
Intent intent = new Intent(this, DetailedActivity.class);
startActivity(intent);
} else if ("large".equalsIgnoreCase(device)) {
DetailedFragment fragment = DetailedFragment.newInstance();
fragment.show(getSupportFragmentManager(), "Tablet_specific");
}
}
回答2:
OK, I have been there and done that. To make a DialogFragment you need a layout defined in XML. Say, for this you have LinearLayout as root. In this LinearLayout you can add a fragment class="...." and when you display your DialogFragment, it will be the same Fragment you displayed side by side on the tablet now displayed in a DialogFragment.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
<fragment class="com.example.tqafragments.FeedFragment" android:id="@+id/feedFragment" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1"/>
</LinearLayout>
Like so. And inflate this in your DialogFragment
回答3:
To make a DialogFragment show as a regular Fragment, call add() or replace() using a resource ID for the fragment container, e.g
beginTransaction().add(R.id.fragment_container, fragment)
But to make the DialogFragment display as a dialog, call add(fragment, "Fragment Tag"). Behind the scenes this results in a call to add(resId, fragment), setting the resource ID for the fragment container to 0, which causes the DialogFragment to set its showAsDialog option to true.
As a consequence you can use a dialog fragment as a dialog or a regular fragment - depending on your needs - without needing to create any special logic to do it.
来源：https://stackoverflow.com/questions/18578295/android-fragment-show-as-dialogfragment-or-usual-fragment